[英]My app is crashing when I try to go to another activity
我試圖將可點擊的圖像按鈕重定向到mainactivity,但是由於我放了這段代碼,所以當我單擊按鈕轉到第二個活動時,應用程序崩潰。
這是我第一次進行申請時使用的ID。
Activity_good.java
public class Activity_good extends AppCompatActivity {
private Button backGood;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_good);
final TextView txtBien = (TextView) findViewById(R.id.txtBien);
Button genBien = (Button) findViewById(R.id.genBien);
final String[] pBien={"« Pour réussir, votre désir de réussite doit être plus grand que votre peur de l’échec. » Bill Cosby", "trql", "oui", "non"};
genBien.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int rando = (int) (Math.random()*4);
txtBien.setText(pBien[rando]);
}
});
backGood = (Button) findViewById(R.id.backGood);
backGood.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
openMainActivity();
}
});
}
public void openMainActivity(){
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity {
private Button button1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final MediaPlayer pianoman = MediaPlayer.create(this, R.raw.piano);
button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
pianoman.start();
openActivity_good();
}
});
}
public void openActivity_good() {
Intent intent = new Intent(this, Activity_good.class);
startActivity(intent);
}
}
崩潰日志?
E/MediaPlayer: error (1, -19)
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: fr.gab.artapp, PID: 9016
java.lang.RuntimeException: Unable to start activity ComponentInfo{fr.gab.artapp/fr.gab.artapp.Activity_good}: java.lang.ClassCastException: android.support.v7.widget.AppCompatImageButton cannot be cast to android.widget.Button
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
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.ClassCastException: android.support.v7.widget.AppCompatImageButton cannot be cast to android.widget.Button
at fr.gab.artapp.Activity_good.onCreate(Activity_good.java:30)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
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)
Application terminated.
當單擊按鈕backGood時,我試圖恢復為mainactivity。+
更改此行:
backGood = (Button) findViewById(R.id.backGood);
對此:
backGood = (AppCompatImageButton) findViewById(R.id.backGood);
您正在將AppCompatImageButton強制轉換為Button。
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