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[英]Adding in MediaPlayer is crashing my app - Unable to output sound
[英]MediaPlayer Crashing my App (edit: it was caused by an out of bound array)
作为此问题的后续措施,在MediaPlayer中连续播放声音时应用程序崩溃
我将代码从onCreate
复制到另一个方法(名为buttonTapped
)中。 该应用程序在onCreate
期间可以正确播放声音,但是在buttonTapped
方法(通过点击按钮)时崩溃而没有播放任何声音。 错误消息是:
不幸的是,该应用程序已停止。
这是代码,然后是堆栈跟踪
public class MainActivity extends Activity implements MediaPlayer.OnCompletionListener {
int[] tracks = new int[3];
int currentTrack = 0;
private MediaPlayer mediaPlayer = null;
public void buttonTapped(View view){
tracks[0] = R.raw.p46;
tracks[1] = R.raw.p52;
tracks[2] = R.raw.p55;
mediaPlayer = MediaPlayer.create(getApplicationContext(), tracks[currentTrack]);
mediaPlayer.setOnCompletionListener(this);
mediaPlayer.start();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tracks[0] = R.raw.p46;
tracks[1] = R.raw.p52;
tracks[2] = R.raw.p55;
mediaPlayer = MediaPlayer.create(getApplicationContext(), tracks[currentTrack]);
mediaPlayer.setOnCompletionListener(this);
mediaPlayer.start();
}
public void onCompletion(MediaPlayer arg0) {
arg0.release();
currentTrack++;
if (currentTrack < tracks.length) {
arg0 = MediaPlayer.create(getApplicationContext(), tracks[currentTrack]);
arg0.setOnCompletionListener(this);
arg0.start();
}
}
530-530/com.maxd.soundtesting E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.maxd.soundtesting, PID: 530
java.lang.IllegalStateException: Could not execute method of the activity
at android.view.View$1.onClick(View.java:4020)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5257)
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.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.view.View$1.onClick(View.java:4015)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5257)
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.ArrayIndexOutOfBoundsException: length=3; index=3
at com.maxd.soundtesting.MainActivity.buttonTapped(MainActivity.java:22)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.view.View$1.onClick(View.java:4015)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5257)
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)
在点击按钮时,您无需将currentTrack重置为0。因此,在onCreate播放3种声音之后,currentTrack = 3,这是无效索引,因为当前轨道只能等于0、1或2。
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