android native开发与android和网页交互相关问题 2C

webview中打开一个网页,网页中的按钮点击会跳转这个链接native-api://{"native-proc":{"api-name":"ChangesScreenToConfiguration","parames":""},"success-js-proc":"","error-js-proc":""}',然后打开一个android原生的界面,我想知道这个是要写native-api的方法吗?要怎么做才能有这种效果啊?有谁做过此类方法的吗?纠结好久了啊!

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不知道怎么回事。。 ``` package com.example.lenovo.myapplication; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.Toast; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button button = (Button)findViewById(R.id.button); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(MainActivity.this,"123456".charAt(2),Toast.LENGTH_SHORT).show(); } }); } } ``` ![图片说明](https://img-ask.csdn.net/upload/201911/04/1572859721_587300.png) 报错: ``` 11/04 17:21:36: Launching app $ adb push D:\study\Android\MyApplication2\app\build\outputs\apk\app-debug.apk /data/local/tmp/com.example.lenovo.myapplication $ adb shell pm install -r "/data/local/tmp/com.example.lenovo.myapplication" Success $ adb shell am start -n "com.example.lenovo.myapplication/com.example.lenovo.myapplication.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER Connected to process 4133 on device Nexus_5_API_24 [emulator-5554] W/System: ClassLoader referenced unknown path: /data/app/com.example.lenovo.myapplication-1/lib/x86 I/InstantRun: Instant Run Runtime started. Android package is com.example.lenovo.myapplication, real application class is null. W/System: ClassLoader referenced unknown path: /data/app/com.example.lenovo.myapplication-1/lib/x86 W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable W/gralloc_ranchu: Gralloc pipe failed [ 11-04 09:21:43.377 4133: 4133 D/ ] HostConnection::get() New Host Connection established 0xa63882c0, tid 4133 [ 11-04 09:21:43.425 4133: 4224 D/ ] HostConnection::get() New Host Connection established 0xa6388740, tid 4224 I/OpenGLRenderer: Initialized EGL, version 1.4 D/OpenGLRenderer: Swap behavior 1 W/ResourceType: No package identifier when getting value for resource number 0x00000033 D/AndroidRuntime: Shutting down VM E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.lenovo.myapplication, PID: 4133 android.content.res.Resources$NotFoundException: String resource ID #0x33 at android.content.res.Resources.getText(Resources.java:331) at android.widget.Toast.makeText(Toast.java:287) at com.example.lenovo.myapplication.MainActivity$1.onClick(MainActivity.java:19) at android.view.View.performClick(View.java:5610) at android.view.View$PerformClick.run(View.java:22260) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) Application terminated. ```
安卓开发JDBC连接数据库No static method metafactory错误怎么解决?
直接上代码 JdbcUtil类 ``` package com.example.myapplication; import java.io.File; import java.io.FileInputStream; import java.sql.Connection; import java.sql.DriverManager; import java.util.Properties; public class JdbcUtil { private static JdbcUtil instance; public static JdbcUtil getInstance(){ if (instance ==null){ instance = new JdbcUtil(); } return instance; } public Connection getConnection(String dbName,String name,String password) { try { new com.mysql.cj.jdbc.Driver(); String url = "jdbc:mysql://localhost:3306/"+dbName; return DriverManager.getConnection(url,name,password); } catch (Exception e) { return null; } } public Connection getConnection(String file){ File f = new File(file); if(!f.exists()){ return null; }else { Properties pro = new Properties(); try { Class.forName("com.mysql.jdbc.Driver"); pro.load(new FileInputStream(f)); String url = pro.getProperty("url"); String name = pro.getProperty("name"); String password = pro.getProperty("password"); return DriverManager.getConnection(url,name,password); }catch (Exception e){ return null; } } } } ``` UserDao类 ``` package com.example.myapplication; import android.util.Log; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import static android.content.ContentValues.TAG; public class UserDao { JdbcUtil jdbcUtil = JdbcUtil.getInstance(); //第一个参数为数据库名称,第二个参数为数据库账号 第三个参数为数据库密码 Connection conn = jdbcUtil.getConnection("test","root","LHMbdbqandr2015"); //注册 public boolean register(String name,String password){ if (conn==null){ Log.i(TAG,"register:conn is null"); return false; }else { //进行数据库操作 String sql = "insert into user(name,password) values(?,?)"; try { PreparedStatement pre = conn.prepareStatement(sql); pre.setString(1,name); pre.setString(2,password); return pre.execute(); } catch (SQLException e) { return false; }finally { try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } } } //登录 public boolean login(String name,String password){ if (conn==null){ Log.i(TAG,"register:conn is null"); return false; }else { String sql = "select * from user where name=? and password=?"; try { PreparedStatement pres = conn.prepareStatement(sql); pres.setString(1,name); pres.setString(2,password); ResultSet res = pres.executeQuery(); boolean t = res.next(); return t; } catch (SQLException e) { return false; } } } } ``` MainActivity文件 ``` package com.example.myapplication; import android.Manifest; import android.content.Intent; import android.content.pm.PackageManager; import android.os.Build; import android.os.Bundle; import android.os.Looper; import android.os.Trace; import android.util.Log; import android.view.View; import android.widget.EditText; import android.widget.Toast; import androidx.appcompat.app.AppCompatActivity; public class MainActivity extends AppCompatActivity { private static final String TAG="MainActivity"; private EditText name; private EditText password; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); name = findViewById(R.id.name); password = findViewById(R.id.password); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { if (checkSelfPermission(Manifest.permission.INTERNET) != PackageManager.PERMISSION_GRANTED) { // TODO: Consider calling // Activity#requestPermissions requestPermissions(new String[]{Manifest.permission.INTERNET},1); // here to request the missing permissions, and then overriding // public void onRequestPermissionsResult(int requestCode, String[] permissions, // int[] grantResults) // to handle the case where the user grants the permission. See the documentation // for Activity#requestPermissions for more details. return; } } } //用户根据点击事件来找到相应的功能 public void fun(View v){ switch (v.getId()){ case R.id.register: new Thread(new Runnable() { @Override public void run() { String n = name.getText().toString().trim(); String psw = password.getText().toString().trim(); UserDao ud = new UserDao(); boolean result =ud.register(n,psw); if (!result){ Looper.prepare(); Toast toast = Toast.makeText(MainActivity.this,"注册成功!",Toast.LENGTH_SHORT); toast.show(); Looper.loop(); } Log.i(TAG,"fun"+result); //以上为jdbc注册 } }).start(); break; case R.id.login: new Thread(new Runnable() { @Override public void run() { String n = name.getText().toString().trim(); String psw = password.getText().toString().trim(); if (n.equals("")||psw.equals("")){ Looper.prepare(); Toast toast = Toast.makeText(MainActivity.this,"输入不能为空!",Toast.LENGTH_SHORT); toast.show(); Looper.loop(); } UserDao ud = new UserDao(); Boolean result = ud.login(n,psw); if (!result){ Looper.prepare(); Toast toast=Toast.makeText(MainActivity.this,"用户名不存在或密码错误!",Toast.LENGTH_SHORT); toast.show(); Looper.loop(); }else{ Looper.prepare(); Toast toast=Toast.makeText(MainActivity.this,"登录成功",Toast.LENGTH_SHORT); toast.show(); //一下代码为跳转界面 // Intent intent=new Intent(MainActivity.this,info.class); //intent.putExtra("name",n); // startActivity(intent); Looper.loop(); } //以上为jdbc登录 } }).start(); } } } ``` 现在遇到的问题如下 ``` 11/14 01:40:49: Launching 'app' on Nexus 5X API 29 x86. $ adb shell am start -n "com.example.myapplication/com.example.myapplication.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER Waiting for process to come online... Connected to process 23852 on device 'emulator-5554'. Capturing and displaying logcat messages from application. This behavior can be disabled in the "Logcat output" section of the "Debugger" settings page. I/e.myapplicatio: Not late-enabling -Xcheck:jni (already on) E/e.myapplicatio: Unknown bits set in runtime_flags: 0x8000 W/e.myapplicatio: Unexpected CPU variant for X86 using defaults: x86 D/libEGL: Emulator has host GPU support, qemu.gles is set to 1. W/libc: Unable to set property "qemu.gles" to "1": connection failed; errno=13 (Permission denied) W/RenderThread: type=1400 audit(0.0:129): avc: denied { write } for name="property_service" dev="tmpfs" ino=8368 scontext=u:r:untrusted_app:s0:c130,c256,c512,c768 tcontext=u:object_r:property_socket:s0 tclass=sock_file permissive=0 app=com.example.myapplication D/libEGL: loaded /vendor/lib/egl/libEGL_emulation.so D/libEGL: loaded /vendor/lib/egl/libGLESv1_CM_emulation.so D/libEGL: loaded /vendor/lib/egl/libGLESv2_emulation.so W/e.myapplicatio: Accessing hidden method Landroid/view/View;->computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z (greylist, reflection, allowed) Accessing hidden method Landroid/view/ViewGroup;->makeOptionalFitsSystemWindows()V (greylist, reflection, allowed) D/: HostConnection::get() New Host Connection established 0xd7d24f50, tid 23910 D/: HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_native_sync_v2 ANDROID_EMU_native_sync_v3 ANDROID_EMU_dma_v1 ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1 ANDROID_EMU_host_composition_v2 ANDROID_EMU_vulkan ANDROID_EMU_deferred_vulkan_commands ANDROID_EMU_vulkan_null_optional_strings ANDROID_EMU_vulkan_create_resources_with_requirements ANDROID_EMU_YUV420_888_to_NV21 ANDROID_EMU_YUV_Cache GL_OES_EGL_image_external_essl3 GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_gles_max_version_3_1 W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without... D/eglCodecCommon: setVertexArrayObject: set vao to 0 (0) 0 0 D/EGL_emulation: eglCreateContext: 0xe3340b60: maj 3 min 1 rcv 4 D/EGL_emulation: eglMakeCurrent: 0xe3340b60: ver 3 1 (tinfo 0xe338bc10) E/eglCodecCommon: glUtilsParamSize: unknow param 0x000082da glUtilsParamSize: unknow param 0x000082da W/Gralloc3: mapper 3.x is not supported D/: createUnique: call D/: HostConnection::get() New Host Connection established 0xd7d26ad0, tid 23910 HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_native_sync_v2 ANDROID_EMU_native_sync_v3 ANDROID_EMU_dma_v1 ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1 ANDROID_EMU_host_composition_v2 ANDROID_EMU_vulkan ANDROID_EMU_deferred_vulkan_commands ANDROID_EMU_vulkan_null_optional_strings ANDROID_EMU_vulkan_create_resources_with_requirements ANDROID_EMU_YUV420_888_to_NV21 ANDROID_EMU_YUV_Cache GL_OES_EGL_image_external_essl3 GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_gles_max_version_3_1 D/eglCodecCommon: allocate: Ask for block of size 0x1000 D/eglCodecCommon: allocate: ioctl allocate returned offset 0x3ffff6000 size 0x2000 D/EGL_emulation: eglMakeCurrent: 0xe3340b60: ver 3 1 (tinfo 0xe338bc10) D/eglCodecCommon: setVertexArrayObject: set vao to 0 (0) 0 0 I/AssistStructure: Flattened final assist data: 1788 bytes, containing 1 windows, 10 views W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blacklist, linking, denied) E/AndroidRuntime: FATAL EXCEPTION: Thread-2 Process: com.example.myapplication, PID: 23852 java.lang.NoSuchMethodError: No static method metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; in class Ljava/lang/invoke/LambdaMetafactory; or its super classes (declaration of 'java.lang.invoke.LambdaMetafactory' appears in /apex/com.android.runtime/javalib/core-oj.jar) at com.mysql.cj.conf.ConnectionUrl.buildConnectionStringCacheKey(ConnectionUrl.java:246) at com.mysql.cj.conf.ConnectionUrl.getConnectionUrlInstance(ConnectionUrl.java:185) at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:204) at java.sql.DriverManager.getConnection(DriverManager.java:580) at java.sql.DriverManager.getConnection(DriverManager.java:218) at com.example.myapplication.JdbcUtil.getConnection(JdbcUtil.java:22) at com.example.myapplication.UserDao.<init>(UserDao.java:15) at com.example.myapplication.MainActivity$1.run(MainActivity.java:53) at java.lang.Thread.run(Thread.java:919) D/EGL_emulation: eglMakeCurrent: 0xe3340b60: ver 3 1 (tinfo 0xe338bc10) D/AutofillManager: onActivityFinishing(): calling cancelLocked() Process 23852 terminated. ``` 在网上百度了很多方法都没有解决,起初以为是驱动的问题,但是换了一个仍然不好用,求求大神赐教
react-native run-android报错ould not resolve all artifacts for configuration ':classpath'.
首次使用react native出现以下错误,但是 com.android.tools.build:gradle:3.3.0在我其他项目上是可以使用的
Android native C编译出错,提示没有规则可以创建xxxx,需要的目标xxx停止
在编译好的环境中,编译C程序,Android.mk如下: LOCAL_PATH:= $(call my-dir) include $(CLEAR_VARS) LOCAL_SRC_FILES:=./capture.c LOCAL_MODULE := capture_audio LOCAL_C_INCLUDES:=$(LOCAL_PATH) LOCAL_SHARED_LIBRARIES:=libc.so \ libasound.so include $(BUILD_EXECUTABLE) 一直修改路径最终确定路径肯定没问题,但make capture_audio一直报下面的错: make: *** 没有规则可以创建“out/target/product/rk3288/obj/EXECUTABLES/capture_audio_intermediates/import_includes”需要的目标“out/target/product/rk3288/obj/SHARED_LIBRARIES/libasound.so_intermediates/export_includes”。 停止 求各位大哥大姐们指教,万分感谢~
在真机上运行是没有问题的,在as自带的模拟器上出现连接不上native的问题,哪位大佬能帮忙分析下不?
java.lang.UnsatisfiedLinkError: dlopen failed: "/data/app/com.ylst.lookhome-JI9EgH8zVXvvgSCHMVu86A==/lib/x86/libnative.so" has text relocations (https://android.googlesource.com/platform/bionic/+/master/android-changes-for-ndk-developers.md#Text-Relocations-Enforced-for-API-level-23) at java.lang.Runtime.loadLibrary0(Runtime.java:1016) at java.lang.System.loadLibrary(System.java:1657) at com.application.Native.<clinit>(Native.java:10) at com.application.Native.DeInitMess(Native Method) at com.doorbell.wecsee.services.PushService.onDestroy(PushService.java:213) at android.app.ActivityThread.handleStopService(ActivityThread.java:3504) at android.app.ActivityThread.-wrap26(Unknown Source:0) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1697) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loop(Looper.java:164) at android.app.ActivityThread.main(ActivityThread.java:6494) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
三星盖乐世s6开发时,需要打开三星手机自带的“智能管理器”来引导用户打开“自启动”权限,该怎么实现?
三星盖乐世s6开发时,需要打开三星手机自带的“智能管理器”来引导用户打开“自启动”权限,该怎么实现?我使用如下代码,但是报错了。 ``` super.onStart(); Intent intent = new Intent(); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); if (Build.MANUFACTURER.equals("samsung")) { LogInfo.d("equals samsung"); } ComponentName componentName =new ComponentName("com.samsung.android.sm_cn","com.samsung.android.sm.ui.ram.AutoRunActivity"); intent.setComponent(componentName); startActivity(intent); ``` 报错: ``` 2019-11-13 22:51:49.602 4590-4590/? E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.intelligentalarmclock, PID: 4590 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.intelligentalarmclock/com.example.intelligentalarmclock.MainActivity}: java.lang.SecurityException: Permission Denial: starting Intent { flg=0x10000000 cmp=com.samsung.android.sm_cn/com.samsung.android.sm.ui.ram.AutoRunActivity launchParam=MultiScreenLaunchParams { mDisplayId=0 mFlags=0 } } from ProcessRecord{2da72bd 4590:com.example.intelligentalarmclock/u0a178} (pid=4590, uid=10178) not exported from uid 1000 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2927) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2988) at android.app.ActivityThread.-wrap14(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1631) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6682) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410) Caused by: java.lang.SecurityException: Permission Denial: starting Intent { flg=0x10000000 cmp=com.samsung.android.sm_cn/com.samsung.android.sm.ui.ram.AutoRunActivity launchParam=MultiScreenLaunchParams { mDisplayId=0 mFlags=0 } } from ProcessRecord{2da72bd 4590:com.example.intelligentalarmclock/u0a178} (pid=4590, uid=10178) not exported from uid 1000 at android.os.Parcel.readException(Parcel.java:1693) at android.os.Parcel.readException(Parcel.java:1646) at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:3530) at android.app.Instrumentation.execStartActivity(Instrumentation.java:1526) at android.app.Activity.startActivityForResult(Activity.java:4399) at androidx.fragment.app.FragmentActivity.startActivityForResult(FragmentActivity.java:767) at android.app.Activity.startActivityForResult(Activity.java:4358) at androidx.fragment.app.FragmentActivity.startActivityForResult(FragmentActivity.java:754) at android.app.Activity.startActivity(Activity.java:4682) at android.app.Activity.startActivity(Activity.java:4650) at com.example.intelligentalarmclock.MainActivity.onStart(MainActivity.java:251) at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1256) at android.app.Activity.performStart(Activity.java:6959) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2890) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2988)  at android.app.ActivityThread.-wrap14(ActivityThread.java)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1631)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:154)  at android.app.ActivityThread.main(ActivityThread.java:6682)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)  ``` 这是怎么回事?需要什么权限吗?
Android Studio 升级到3.5的错误
Android Studio 弹出升级的消息框,手贱点了一下 ,然后升级到了Android Studio3.5,升级完成后打开Android Studio ,提示升级失败,查看错误为: java.lang.UnsatisfiedLinkError: org.sqlite.core.NativeDB._open_utf8([BI)V at org.sqlite.core.NativeDB._open_utf8(Native Method) at org.sqlite.core.NativeDB._open(NativeDB.java:71) at org.sqlite.core.DB.open(DB.java:174) at org.sqlite.core.CoreConnection.open(CoreConnection.java:220) at org.sqlite.core.CoreConnection.<init>(CoreConnection.java:76) at org.sqlite.jdbc3.JDBC3Connection.<init>(JDBC3Connection.java:25) at org.sqlite.jdbc4.JDBC4Connection.<init>(JDBC4Connection.java:24) at org.sqlite.SQLiteConnection.<init>(SQLiteConnection.java:45) at org.sqlite.JDBC.createConnection(JDBC.java:114) at org.sqlite.JDBC.connect(JDBC.java:88) at java.sql.DriverManager.getConnection(DriverManager.java:664) at java.sql.DriverManager.getConnection(DriverManager.java:270) at com.android.tools.deployer.SqlApkFileDatabase.<init>(SqlApkFileDatabase.java:62) at com.android.tools.deployer.SqlApkFileDatabase.<init>(SqlApkFileDatabase.java:50) at com.android.tools.idea.run.DeploymentService.<init>(DeploymentService.java:56) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at org.picocontainer.defaults.InstantiatingComponentAdapter.newInstance(InstantiatingComponentAdapter.java:193) at com.intellij.util.pico.CachingConstructorInjectionComponentAdapter.doGetComponentInstance(CachingConstructorInjectionComponentAdapter.java:92) at com.intellij.util.pico.CachingConstructorInjectionComponentAdapter.instantiateGuarded(CachingConstructorInjectionComponentAdapter.java:66) at com.intellij.util.pico.CachingConstructorInjectionComponentAdapter.getComponentInstance(CachingConstructorInjectionComponentAdapter.java:48) at com.intellij.openapi.components.impl.ServiceManagerImpl$MyComponentAdapter.createAndInitialize(ServiceManagerImpl.java:222) at com.intellij.openapi.components.impl.ServiceManagerImpl$MyComponentAdapter.lambda$getComponentInstance$0(ServiceManagerImpl.java:209) at com.intellij.openapi.components.impl.ServiceManagerImpl$MyComponentAdapter.getComponentInstance(ServiceManagerImpl.java:213) at com.intellij.util.pico.DefaultPicoContainer.getLocalInstance(DefaultPicoContainer.java:246) at com.intellij.util.pico.DefaultPicoContainer.getComponentInstance(DefaultPicoContainer.java:213) at com.intellij.openapi.components.ServiceManager.doGetService(ServiceManager.java:52) at com.intellij.openapi.components.ServiceManager.getService(ServiceManager.java:30) at com.android.tools.idea.run.DeploymentService.getInstance(DeploymentService.java:48) at com.android.tools.idea.deploy.DeployActionsInitializer.updateDeployableProvider(DeployActionsInitializer.java:184) at com.android.tools.idea.deploy.DeployActionsInitializer.access$000(DeployActionsInitializer.java:56) at com.android.tools.idea.deploy.DeployActionsInitializer$1.projectOpened(DeployActionsInitializer.java:123) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at com.intellij.util.messages.impl.MessageBusConnectionImpl.deliverMessage(MessageBusConnectionImpl.java:114) at com.intellij.util.messages.impl.MessageBusImpl.doPumpMessages(MessageBusImpl.java:393) at com.intellij.util.messages.impl.MessageBusImpl.pumpWaitingBuses(MessageBusImpl.java:354) at com.intellij.util.messages.impl.MessageBusImpl.pumpMessages(MessageBusImpl.java:343) at com.intellij.util.messages.impl.MessageBusImpl.sendMessage(MessageBusImpl.java:320) at com.intellij.util.messages.impl.MessageBusImpl.access$100(MessageBusImpl.java:29) at com.intellij.util.messages.impl.MessageBusImpl$1.invoke(MessageBusImpl.java:192) at com.sun.proxy.$Proxy17.projectOpened(Unknown Source) at com.intellij.openapi.project.impl.ProjectManagerImpl.fireProjectOpened(ProjectManagerImpl.java:780) at com.intellij.openapi.project.impl.ProjectManagerImpl.lambda$null$6(ProjectManagerImpl.java:401) at com.intellij.openapi.application.TransactionGuardImpl.lambda$submitTransactionAndWait$2(TransactionGuardImpl.java:165) at com.intellij.openapi.application.TransactionGuardImpl.runSyncTransaction(TransactionGuardImpl.java:88) at com.intellij.openapi.application.TransactionGuardImpl.lambda$submitTransaction$1(TransactionGuardImpl.java:111) at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.doRun(LaterInvocator.java:435) at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.runNextEvent(LaterInvocator.java:419) at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:403) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:764) at java.awt.EventQueue.access$500(EventQueue.java:98) at java.awt.EventQueue$3.run(EventQueue.java:715) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74) at java.awt.EventQueue.dispatchEvent(EventQueue.java:734) at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:757) at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:706) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:375) at com.intellij.ide.IdeEventQueue.pumpEventsForHierarchy(IdeEventQueue.java:814) at com.intellij.openapi.progress.util.ProgressWindow.startBlocking(ProgressWindow.java:210) at com.intellij.openapi.progress.util.ProgressWindow.startBlocking(ProgressWindow.java:196) at com.intellij.openapi.application.impl.ApplicationImpl.runProcessWithProgressSynchronously(ApplicationImpl.java:609) at com.intellij.openapi.progress.impl.CoreProgressManager.runProcessWithProgressSynchronously(CoreProgressManager.java:454) at com.intellij.openapi.progress.impl.ProgressManagerImpl.runProcessWithProgressSynchronously(ProgressManagerImpl.java:109) at com.intellij.openapi.progress.impl.CoreProgressManager.runProcessWithProgressSynchronously(CoreProgressManager.java:251) at com.intellij.openapi.progress.impl.CoreProgressManager.runProcessWithProgressSynchronously(CoreProgressManager.java:205) at com.intellij.openapi.project.impl.ProjectManagerImpl.loadProjectUnderProgress(ProjectManagerImpl.java:450) at com.intellij.openapi.project.impl.ProjectManagerImpl.openProject(ProjectManagerImpl.java:425) at com.intellij.platform.PlatformProjectOpenProcessor.doOpenProject(PlatformProjectOpenProcessor.java:260) at com.intellij.ide.RecentProjectsManagerBase.doOpenProject(RecentProjectsManagerBase.java:512) at com.intellij.ide.RecentProjectsManagerBase.doReopenLastProject(RecentProjectsManagerBase.java:634) at com.intellij.ide.RecentProjectsManagerBase$MyAppLifecycleListener.appStarting(RecentProjectsManagerBase.java:692) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at com.intellij.util.messages.impl.MessageBusConnectionImpl.deliverMessage(MessageBusConnectionImpl.java:114) at com.intellij.util.messages.impl.MessageBusImpl.doPumpMessages(MessageBusImpl.java:393) at com.intellij.util.messages.impl.MessageBusImpl.pumpWaitingBuses(MessageBusImpl.java:354) at com.intellij.util.messages.impl.MessageBusImpl.pumpMessages(MessageBusImpl.java:343) at com.intellij.util.messages.impl.MessageBusImpl.sendMessage(MessageBusImpl.java:320) at com.intellij.util.messages.impl.MessageBusImpl.access$100(MessageBusImpl.java:29) at com.intellij.util.messages.impl.MessageBusImpl$1.invoke(MessageBusImpl.java:192) at com.sun.proxy.$Proxy63.appStarting(Unknown Source) at com.intellij.idea.IdeaApplication$IdeStarter.lambda$main$1(IdeaApplication.java:388) at com.intellij.openapi.application.TransactionGuardImpl.runSyncTransaction(TransactionGuardImpl.java:88) at com.intellij.openapi.application.TransactionGuardImpl.lambda$submitTransaction$1(TransactionGuardImpl.java:111) at com.intellij.openapi.application.TransactionGuardImpl.submitTransaction(TransactionGuardImpl.java:120) at com.intellij.openapi.application.TransactionGuard.submitTransaction(TransactionGuard.java:121) at com.intellij.idea.IdeaApplication$IdeStarter.main(IdeaApplication.java:386) at com.intellij.idea.IdeaApplication.lambda$run$1(IdeaApplication.java:220) at com.intellij.openapi.application.TransactionGuardImpl.performUserActivity(TransactionGuardImpl.java:195) at com.intellij.idea.IdeaApplication.run(IdeaApplication.java:220) at com.intellij.idea.IdeaApplication.lambda$initApplication$0(IdeaApplication.java:77) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:764) at java.awt.EventQueue.access$500(EventQueue.java:98) at java.awt.EventQueue$3.run(EventQueue.java:715) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74) at java.awt.EventQueue.dispatchEvent(EventQueue.java:734) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:349) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) 操作系统是Win10 专业版 64位。 以为是我的老版本导致的程序不对,然后把和Android Studio有关的文件都删了,重新安装,安装好了以后可以用了,但是关了AS,再重新打开AS,又开始报上面的错误,有没有遇到这个问题的?如何来解决这个问题? ------------------------------------------------------------》》》》》 很白痴的问题,以及个人的习惯导致的,使用管理员权限打开就好了,AS会在AppData/Local 中创建一个临时的sqlite 数据访问的dll,不是管理员权限访问不了,就导致了这个错误。
根据官网创建的react-native项目用android studio 打开 运行标志为灰色
通过命令react-native run-android 项目可以运行到真机,通过android stuido打开该项目无法运行 ![图片说明](https://img-ask.csdn.net/upload/201903/21/1553137099_750337.jpg) android studio不是新安装的,已经做了很多app。是对于react-native 还要添加哪些配置吗,如果通过android studio来运行react-native项目呢
android studio 经常用着用着就报错,不知道什么情况?
java.lang.RuntimeException: java.io.EOFException at com.intellij.util.ExceptionUtilRt.rethrow(ExceptionUtilRt.java:31) at com.intellij.util.ExceptionUtil.rethrow(ExceptionUtil.java:120) at com.intellij.openapi.vfs.newvfs.persistent.FSRecords$DbConnection.handleError(FSRecords.java:535) at com.intellij.openapi.vfs.newvfs.persistent.FSRecords$DbConnection.access$000(FSRecords.java:160) at com.intellij.openapi.vfs.newvfs.persistent.FSRecords.readContent(FSRecords.java:1251) at com.intellij.openapi.vfs.newvfs.persistent.PersistentFSImpl.readContent(PersistentFSImpl.java:230) at com.intellij.openapi.vfs.newvfs.persistent.PersistentFSImpl.contentsToByteArray(PersistentFSImpl.java:492) at com.intellij.openapi.vfs.newvfs.impl.VirtualFileImpl.contentsToByteArray(VirtualFileImpl.java:139) at com.intellij.openapi.vfs.newvfs.impl.VirtualFileImpl.contentsToByteArray(VirtualFileImpl.java:130) at com.intellij.openapi.fileEditor.impl.FileDocumentManagerImpl.isSaveNeeded(FileDocumentManagerImpl.java:463) at com.intellij.openapi.fileEditor.impl.FileDocumentManagerImpl.doSaveDocumentInWriteAction(FileDocumentManagerImpl.java:406) at com.intellij.openapi.fileEditor.impl.FileDocumentManagerImpl.lambda$doSaveDocument$2(FileDocumentManagerImpl.java:384) at com.intellij.openapi.application.WriteAction.run(WriteAction.java:106) at com.intellij.openapi.fileEditor.impl.FileDocumentManagerImpl.doSaveDocument(FileDocumentManagerImpl.java:384) at com.intellij.openapi.fileEditor.impl.FileDocumentManagerImpl.saveAllDocuments(FileDocumentManagerImpl.java:304) at com.intellij.openapi.fileEditor.impl.FileDocumentManagerImpl.saveAllDocuments(FileDocumentManagerImpl.java:282) at com.intellij.openapi.components.impl.stores.StoreUtil.saveDocumentsAndProjectsAndApp(StoreUtil.java:105) at com.intellij.openapi.application.impl.ApplicationImpl.saveAll(ApplicationImpl.java:1454) at com.intellij.ide.SaveAndSyncHandlerImpl.saveProjectsAndDocuments(SaveAndSyncHandlerImpl.java:126) at com.intellij.ide.SaveAndSyncHandlerImpl$2.lambda$onFrameDeactivated$0(SaveAndSyncHandlerImpl.java:94) at com.intellij.openapi.application.TransactionGuardImpl.runSyncTransaction(TransactionGuardImpl.java:88) at com.intellij.openapi.application.TransactionGuardImpl.lambda$submitTransaction$1(TransactionGuardImpl.java:111) at com.intellij.openapi.application.TransactionGuardImpl.submitTransaction(TransactionGuardImpl.java:120) at com.intellij.openapi.application.TransactionGuard.submitTransaction(TransactionGuard.java:122) at com.intellij.ide.SaveAndSyncHandlerImpl$2.onFrameDeactivated(SaveAndSyncHandlerImpl.java:92) at com.intellij.ide.FrameStateManagerImpl.fireDeactivationEvent(FrameStateManagerImpl.java:71) at com.intellij.ide.FrameStateManagerImpl.access$300(FrameStateManagerImpl.java:31) at com.intellij.ide.FrameStateManagerImpl$2.applicationDeactivated(FrameStateManagerImpl.java:58) at sun.reflect.GeneratedMethodAccessor346.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at com.intellij.util.messages.impl.MessageBusConnectionImpl.deliverMessage(MessageBusConnectionImpl.java:117) at com.intellij.util.messages.impl.MessageBusImpl.doPumpMessages(MessageBusImpl.java:397) at com.intellij.util.messages.impl.MessageBusImpl.pumpWaitingBuses(MessageBusImpl.java:358) at com.intellij.util.messages.impl.MessageBusImpl.pumpMessages(MessageBusImpl.java:347) at com.intellij.util.messages.impl.MessageBusImpl.sendMessage(MessageBusImpl.java:324) at com.intellij.util.messages.impl.MessageBusImpl.access$200(MessageBusImpl.java:29) at com.intellij.util.messages.impl.MessageBusImpl$2.invoke(MessageBusImpl.java:196) at com.sun.proxy.$Proxy91.applicationDeactivated(Unknown Source) at com.intellij.ide.ApplicationActivationStateManager.updateState(ApplicationActivationStateManager.java:80) at com.intellij.ide.IdeEventQueue.processAppActivationEvents(IdeEventQueue.java:721) at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:593) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:391) at java.awt.SentEvent.dispatch(SentEvent.java:70) at java.awt.DefaultKeyboardFocusManager$DefaultKeyboardFocusManagerSentEvent.dispatch(DefaultKeyboardFocusManager.java:217) at java.awt.DefaultKeyboardFocusManager.sendMessage(DefaultKeyboardFocusManager.java:244) at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:755) at com.intellij.ide.IdeKeyboardFocusManager.dispatchEvent(IdeKeyboardFocusManager.java:27) at java.awt.Component.dispatchEventImpl(Component.java:4774) at java.awt.Container.dispatchEventImpl(Container.java:2295) at java.awt.Window.dispatchEventImpl(Window.java:2746) at java.awt.Component.dispatchEvent(Component.java:4725) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:764) at java.awt.EventQueue.access$500(EventQueue.java:98) at java.awt.EventQueue$3.run(EventQueue.java:715) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90) at java.awt.EventQueue$4.run(EventQueue.java:737) at java.awt.EventQueue$4.run(EventQueue.java:735) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.awt.EventQueue.dispatchEvent(EventQueue.java:734) at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:755) at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:704) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:391) at java.awt.SequencedEvent.dispatch(SequencedEvent.java:128) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:762) at java.awt.EventQueue.access$500(EventQueue.java:98) at java.awt.EventQueue$3.run(EventQueue.java:715) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90) at java.awt.EventQueue$4.run(EventQueue.java:737) at java.awt.EventQueue$4.run(EventQueue.java:735) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.awt.EventQueue.dispatchEvent(EventQueue.java:734) at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:755) at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:704) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:391) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) Caused by: java.io.EOFException at com.intellij.util.io.storage.RefCountingStorage$CustomInflaterInputStream.fill(RefCountingStorage.java:111) at java.util.zip.InflaterInputStream.read(InflaterInputStream.java:158) at java.io.FilterInputStream.read(FilterInputStream.java:107) at com.intellij.openapi.util.io.StreamUtil.copyStreamContent(StreamUtil.java:44) at com.intellij.util.io.storage.RefCountingStorage.internalReadStream(RefCountingStorage.java:93) at com.intellij.util.io.storage.RefCountingStorage.readStream(RefCountingStorage.java:72) at com.intellij.openapi.vfs.newvfs.persistent.FSRecords.doReadContentById(FSRecords.java:1269) at com.intellij.openapi.vfs.newvfs.persistent.FSRecords.readContent(FSRecords.java:1245) ... 84 more![图片说明](https://img-ask.csdn.net/upload/201912/26/1577339300_981926.png) 重启工具就没事了,但是用个几个小时又会报同样的错,报错后android studio就不能用了且报错前一会儿写的代码也不会保存。
用QT和用React native 进行移动端开发的优劣
最近打算转战移动端的开发,会有ios,Android和wp版本,不想在各个平台下各个开发,于是了解了QT和React native这两种跨平台的方法,想问下移动开发的大神,孰优孰劣
Android 开发报错 No implementation found for void
Android 开发报 No implementation found for void 的错误,跪求大神!!! FATAL EXCEPTION: main Process: com.swz.ywt.dhdemothird, PID: 2134 java.lang.UnsatisfiedLinkError: No implementation found for void com.company.PlaySDK.IPlaySDK.InitNativeObj(int, java.lang.Object, java.lang.Object, java.lang.Object, int) (tried Java_com_company_PlaySDK_IPlaySDK_InitNativeObj and Java_com_company_PlaySDK_IPlaySDK_InitNativeObj__ILjava_lang_Object_2Ljava_lang_Object_2Ljava_lang_Object_2I) at com.company.PlaySDK.IPlaySDK.InitNativeObj(Native Method) at com.company.PlaySDK.IPlaySDK.InitSurface(IPlaySDK.java:149) at com.swz.ywt.dhdemothird.PlayDemoActivity$1.surfaceCreated(PlayDemoActivity.java:147) at android.view.SurfaceView.updateWindow(SurfaceView.java:582) at android.view.SurfaceView$4.setFormat(SurfaceView.java:764) at com.company.PlaySDK.IPlaySDK.UpdateSurface(IPlaySDK.java:221) at com.company.PlaySDK.IPlaySDK.InitSurface(IPlaySDK.java:141) at com.swz.ywt.dhdemothird.PlayDemoActivity$1.surfaceCreated(PlayDemoActivity.java:147) at android.view.SurfaceView.updateWindow(SurfaceView.java:582) at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:177) at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:944) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2055) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858) at android.view.Choreographer.doCallbacks(Choreographer.java:670) at android.view.Choreographer.doFrame(Choreographer.java:606) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 我用的是Android studio2.3.3
android APP连接mysql时,APP闪退
安卓程序连接MySQL一直不成功,本地连接可以。我是用手机调试的,点击接mysql按钮时,APP闪退。在网上找了好多方法都不行。求看看什么问题 错误日志如下: 2019-08-25 08:25:33.377 5570-5570/mark.zhang E/AndroidRuntime: FATAL EXCEPTION: main Process: mark.zhang, PID: 5570 java.lang.IllegalStateException: Could not execute method for android:onClick at android.view.View$DeclaredOnClickListener.onClick(View.java:5692) at android.view.View.performClick(View.java:6663) at android.view.View.performClickInternal(View.java:6635) at android.view.View.access$3100(View.java:794) at android.view.View$PerformClick.run(View.java:26199) at android.os.Handler.handleCallback(Handler.java:907) at android.os.Handler.dispatchMessage(Handler.java:105) at android.os.Looper.loop(Looper.java:216) at android.app.ActivityThread.main(ActivityThread.java:7625) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:987) Caused by: java.lang.reflect.InvocationTargetException at java.lang.reflect.Method.invoke(Native Method) at android.view.View$DeclaredOnClickListener.onClick(View.java:5687) at android.view.View.performClick(View.java:6663)  at android.view.View.performClickInternal(View.java:6635)  at android.view.View.access$3100(View.java:794)  at android.view.View$PerformClick.run(View.java:26199)  at android.os.Handler.handleCallback(Handler.java:907)  at android.os.Handler.dispatchMessage(Handler.java:105)  at android.os.Looper.loop(Looper.java:216)  at android.app.ActivityThread.main(ActivityThread.java:7625)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:987)  Caused by: java.lang.BootstrapMethodError: Exception from call site #39 bootstrap method at com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.<clinit>(AbandonedConnectionCleanupThread.java:58) at java.lang.Class.classForName(Native Method) at java.lang.Class.forName(Class.java:453) at java.lang.Class.forName(Class.java:378) at com.mysql.cj.jdbc.NonRegisteringDriver.<clinit>(NonRegisteringDriver.java:99) at java.lang.Class.classForName(Native Method) at java.lang.Class.forName(Class.java:453) at java.lang.Class.forName(Class.java:378) at mark.zhang.Util.openConnection(Util.java:16) at mark.zhang.Main.onConn(Main.java:30) at java.lang.reflect.Method.invoke(Native Method)  at android.view.View$DeclaredOnClickListener.onClick(View.java:5687)  at android.view.View.performClick(View.java:6663)  at android.view.View.performClickInternal(View.java:6635)  at android.view.View.access$3100(View.java:794)  at android.view.View$PerformClick.run(View.java:26199)  at android.os.Handler.handleCallback(Handler.java:907)  at android.os.Handler.dispatchMessage(Handler.java:105)  at android.os.Looper.loop(Looper.java:216)  at android.app.ActivityThread.main(ActivityThread.java:7625)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:987)  Caused by: java.lang.ClassCastException: Bootstrap method returned null at com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.<clinit>(AbandonedConnectionCleanupThread.java:58)  at java.lang.Class.classForName(Native Method)  at java.lang.Class.forName(Class.java:453)  at java.lang.Class.forName(Class.java:378)  at com.mysql.cj.jdbc.NonRegisteringDriver.<clinit>(NonRegisteringDriver.java:99)  at java.lang.Class.classForName(Native Method)  at java.lang.Class.forName(Class.java:453)  at java.lang.Class.forName(Class.java:378)  at mark.zhang.Util.openConnection(Util.java:16)  at mark.zhang.Main.onConn(Main.java:30)  at java.lang.reflect.Method.invoke(Native Method)  at android.view.View$DeclaredOnClickListener.onClick(View.java:5687)  at android.view.View.performClick(View.java:6663)  at android.view.View.performClickInternal(View.java:6635)  at android.view.View.access$3100(View.java:794)  at android.view.View$PerformClick.run(View.java:26199)  at android.os.Handler.handleCallback(Handler.java:907)  at android.os.Handler.dispatchMessage(Handler.java:105)  at android.os.Looper.loop(Looper.java:216)  at android.app.ActivityThread.main(ActivityThread.java:7625)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:987)  2019-08-25 08:25:33.398 5570-5570/mark.zhang I/Process: Sending signal. 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