Android studio

Question

在android studio中 出现了 这个错误但是不影响运行 的但是看见报错就不舒服 想把这个处理掉

这个代码没有很复杂就是一个简单的网络获取数据 请问这个代码怎么能处理好

Answer 1

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• 这有个类似的问题, 你可以参考下: https://ask.csdn.net/questions/7666928
• 我还给你找了一篇非常好的博客，你可以看看是否有帮助，链接：android studio布局设置手机号码不能超过11位
• 除此之外, 这篇博客: Android Studio 基础 之 简单的多屏异显的功能实现的详细步骤，及相关简单整理中的 六、关键代码 部分也许能够解决你的问题, 你可以仔细阅读以下内容或跳转源博客中阅读:
  

  1、DifferentDislay.java

  import android.app.Presentation;
  import android.content.Context;
  import android.os.Bundle;
  import android.view.Display;
  
  public class DifferentDislay extends Presentation {
  
      public DifferentDislay(Context outerContext, Display display) {
          super(outerContext,display);
  
      }
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.mylayout);
      }
  }

   

  2、MainActivity.java

  
  import android.app.Activity;
  import android.app.Application;
  import android.app.Presentation;
  import android.app.Service;
  import android.content.Context;
  import android.content.Intent;
  import android.graphics.PixelFormat;
  import android.hardware.display.DisplayManager;
  import android.net.Uri;
  import android.os.Build;
  import android.provider.Settings;
  import android.support.v7.app.AppCompatActivity;
  import android.os.Bundle;
  import android.util.Log;
  import android.view.Display;
  import android.view.WindowManager;
  
  public class MainActivity extends AppCompatActivity {
  
      private static final String TAG = "XANTest";
      DifferentDislay mPresentation;
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
          GetPermission();
  
          multiScreenDisplay();
      }
  
      void multiScreenDisplay(){
          //双屏显示
          DisplayManager mDisplayManager;//屏幕管理类
          Display[] displays;//屏幕数组
  
          mDisplayManager =(DisplayManager)MainActivity.this.getSystemService(Context.DISPLAY_SERVICE);
          displays =mDisplayManager.getDisplays(); //得到显示器数组
  
          Log.i(TAG, "multiScreenDisplay: displays count = " + displays.length);
  
          if (displays.length > 1){
  
              mPresentation =new DifferentDislay
                      (getApplicationContext(),displays[1]);//displays[1]是副屏
  
              mPresentation.getWindow().setType(WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY);
  
  
  //            if you use apiLevel >= 19, don't use
  //
  //            WindowManager.LayoutParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT
  //
  //            which gets the following error:
  //
  //            android.view.WindowManager$BadTokenException: Unable to add window android.view.ViewRootImpl$W@40ec8528 -- permission denied for this window type
  //
  //            Use this instead:
  //
  //            LayoutParams.TYPE_TOAST or TYPE_APPLICATION_PANEL
  
  
              mPresentation.show();
          }
  
  
      }
  
      void GetPermission(){
          if(Build.VERSION.SDK_INT >= 23) {
              if (!Settings.canDrawOverlays(this)) {
                  Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                          Uri.parse("package:" + getPackageName()));
                  startActivityForResult(intent, 1234);
              }
          }
          else
          {
              Intent intent = new Intent(this, Service.class);
              startService(intent);
          }
  
      }
  
      @Override
      protected void onStop() {
          super.onStop();
          if (mPresentation != null) {
              mPresentation.dismiss();
          }
      }
  
      @Override
      protected void onResume() {
          super.onResume();
          if (mPresentation != null) {
              mPresentation.show();
          }
      }
  
      @Override
      protected void onDestroy() {
          super.onDestroy();
          if (mPresentation != null) {
              mPresentation.dismiss();
          }
      }
  
  
  }

   

  3、AndroidManifest.xml

  <?xml version="1.0" encoding="utf-8"?>
  <manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.example.testmultiscreendisplay0407">
  
      <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
  
      <application
          android:allowBackup="true"
          android:icon="@mipmap/ic_launcher"
          android:label="@string/app_name"
          android:roundIcon="@mipmap/ic_launcher_round"
          android:supportsRtl="true"
          android:theme="@style/Theme.TestMultiScreenDisplay0407">
          <activity android:name=".MainActivity">
              <intent-filter>
                  <action android:name="android.intent.action.MAIN" />
  
                  <category android:name="android.intent.category.LAUNCHER" />
              </intent-filter>
          </activity>
      </application>
  
  </manifest>

   

  4、activity_main.xml

  <?xml version="1.0" encoding="utf-8"?>
  <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      tools:context=".MainActivity">
  
      <TextView
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="Hello World!"
          app:layout_constraintBottom_toBottomOf="parent"
          app:layout_constraintLeft_toLeftOf="parent"
          app:layout_constraintRight_toRightOf="parent"
          app:layout_constraintTop_toTopOf="parent" />
  
  </android.support.constraint.ConstraintLayout>

   

  5、mylayout.xml

  <?xml version="1.0" encoding="utf-8"?>
  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent">
  
      <TextView
          android:id="@+id/textView"
          android:layout_width="match_parent"
          android:layout_height="658dp"
          android:layout_weight="1"
          android:text="MyTestScreen"
          android:textSize="100dp"
          />
  </LinearLayout>

   

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