在模拟器上运行程序时点击任意位置会出现 很抱歉，“My applicationz"已停止运行
找了半天也不知道是为什么，下面的是logcat代码
03-08 22:53:34.063 5761-5761/? I/art: Late-enabling -Xcheck:jni
03-08 22:53:34.184 5761-5761/com.example.caihongpai W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter androidx.vectordrawable.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
03-08 22:53:34.210 5761-5761/com.example.caihongpai I/art: Rejecting re-init on previously-failed class java.lang.Class<androidx.core.view.ViewCompat$OnUnhandledKeyEventListenerWrapper>
03-08 22:53:34.210 5761-5761/com.example.caihongpai I/art: Rejecting re-init on previously-failed class java.lang.Class<androidx.core.view.ViewCompat$OnUnhandledKeyEventListenerWrapper>
03-08 22:53:34.259 5761-5761/com.example.caihongpai D/AndroidRuntime: Shutting down VM
03-08 22:53:34.259 5761-5761/com.example.caihongpai E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.caihongpai, PID: 5761
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.caihongpai/com.example.caihongpai.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageButton.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2327)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2392)
at android.app.ActivityThread.access$800(ActivityThread.java:153)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1305)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5305)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageButton.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at com.example.caihongpai.MainActivity.onCreate(MainActivity.java:121)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2280)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2392)
at android.app.ActivityThread.access$800(ActivityThread.java:153)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1305)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5305)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
03-08 22:58:34.283 5761-5761/com.example.caihongpai I/Process: Sending signal. PID: 5761 SIG: 9
下面的是.java代码
package com.example.caihongpai;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
Button b1;
ImageButton ib1,ib2,ib3;
ImageView i1,i2,i3;
TextView t1;
static int[] s1={R.drawable.fangpian,R.drawable.heitao,R.drawable.hongtao};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b1=(Button)findViewById(R.id.button);
ib1=(ImageButton) findViewById(R.id.ib1);
ib2=(ImageButton) findViewById(R.id.ib2);
ib2=(ImageButton) findViewById(R.id.ib2);
i1=(ImageView) findViewById(R.id.i1);
i2=(ImageView) findViewById(R.id.i2);
i3=(ImageView) findViewById(R.id.i3);
ib1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ib1.setImageResource(s1[0]);
ib2.setImageResource(s1[1]);
ib3.setImageResource(s1[2]);
if(s1[0]==R.drawable.hongtao){
new AlertDialog.Builder(MainActivity.this)
.setTitle("奥利给")
.setMessage("小伙子，你答对了，真是个天才！！")
.setPositiveButton("确认",null)
.show();
i3.setVisibility(View.VISIBLE);
ib1.setVisibility(View.INVISIBLE);
ib2.setVisibility(View.INVISIBLE);
ib3.setVisibility(View.INVISIBLE);
}else{
new AlertDialog.Builder(MainActivity.this)
.setTitle("向我开炮")
.setMessage("小傻瓜，你答错了，真是个小笨蛋！！")
.setPositiveButton("确认",new DialogInterface.OnClickListener(){
@Override
public void onClick(DialogInterface dialogInterface, int which) {
return;
}
})
.setNegativeButton("再试一次", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
xp();
}
})
.show();
i3.setVisibility(View.VISIBLE);
ib1.setVisibility(View.INVISIBLE);
ib2.setVisibility(View.INVISIBLE);
ib3.setVisibility(View.INVISIBLE);
}
}
});
ib2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ib1.setImageResource(s1[0]);
ib2.setImageResource(s1[1]);
ib3.setImageResource(s1[2]);
if(s1[1]==R.drawable.hongtao){
new AlertDialog.Builder(MainActivity.this)
.setTitle("奥利给")
.setMessage("小伙子，你答对了，真是个天才！！")
.setPositiveButton("确认",null)
.show();
i3.setVisibility(View.VISIBLE);
ib1.setVisibility(View.INVISIBLE);
ib2.setVisibility(View.INVISIBLE);
ib3.setVisibility(View.INVISIBLE);
}else{
new AlertDialog.Builder(MainActivity.this)
.setTitle("向我开炮")
.setMessage("小傻瓜，你答错了，真是个小笨蛋！！")
.setPositiveButton("确认",new DialogInterface.OnClickListener(){
@Override
public void onClick(DialogInterface dialogInterface, int which) {
return;
}
})
.setNegativeButton("再试一次", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
xp();
}
})
.show();
i3.setVisibility(View.VISIBLE);
ib1.setVisibility(View.INVISIBLE);
ib2.setVisibility(View.INVISIBLE);
ib3.setVisibility(View.INVISIBLE);
}
}
});
ib3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ib1.setImageResource(s1[0]);
ib2.setImageResource(s1[1]);
ib3.setImageResource(s1[2]);
if(s1[2]==R.drawable.hongtao){
new AlertDialog.Builder(MainActivity.this)
.setTitle("奥利给")
.setMessage("小伙子，你答对了，真是个天才！！")
.setPositiveButton("确认",null)
.show();
i3.setVisibility(View.VISIBLE);
ib1.setVisibility(View.INVISIBLE);
ib2.setVisibility(View.INVISIBLE);
ib3.setVisibility(View.INVISIBLE);
}else{
new AlertDialog.Builder(MainActivity.this)
.setTitle("向我开炮")
.setMessage("小傻瓜，你答错了，真是个小笨蛋！！")
.setPositiveButton("确认",new DialogInterface.OnClickListener(){
@Override
public void onClick(DialogInterface dialogInterface, int which) {
return;
}
})
.setNegativeButton("再试一次", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
xp();
}
})
.show();
i3.setVisibility(View.VISIBLE);
ib1.setVisibility(View.INVISIBLE);
ib2.setVisibility(View.INVISIBLE);
ib3.setVisibility(View.INVISIBLE);
}
}
});
}
private void xp() {
for (int i = 0; i < 3; i++) {
int tmp = s1[i];
int s = (int) (Math.random() * 2);
s1[i] = s1[s];
s1[s] = tmp;
}
}
}
下面的是xml代码：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
android:background="#0CC6BB"
tools:context=".MainActivity">
<TextView
android:id="@+id/text1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="猜猜红桃A在哪"
android:textSize="30dp"
android:gravity="center"
android:layout_marginTop="50dp"
/>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="180dp"
android:layout_margin="10dp"
android:orientation="horizontal">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="180dp"
android:orientation="horizontal">
<ImageButton
android:id="@+id/ib1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10dp"
android:layout_weight="1"
android:foregroundGravity="top"
app:srcCompat="@drawable/beimian" />
<ImageButton
android:id="@+id/ib2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10dp"
android:layout_weight="1"
android:foregroundGravity="top"
app:srcCompat="@drawable/beimian" />
<ImageButton
android:id="@+id/ib3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10dp"
android:layout_weight="1"
android:foregroundGravity="top"
app:srcCompat="@drawable/beimian" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="180dp"
android:orientation="horizontal">
<ImageView
android:id="@+id/i1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10dp"
android:layout_weight="1"
app:srcCompat="@drawable/heitao"
android:visibility="invisible"/>
<ImageView
android:id="@+id/i2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10dp"
android:layout_weight="1"
app:srcCompat="@drawable/fangpian"
android:visibility="invisible"/>
<ImageView
android:id="@+id/i3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10dp"
android:layout_weight="1"
app:srcCompat="@drawable/hongtao"
android:visibility="invisible"
/>
</LinearLayout>
</FrameLayout>
<Button
android:id="@+id/button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:text="再玩一次噻"
android:textSize="20dp"
/>
</LinearLayout>
希望各位大神帮帮忙
