Question

有人可以帮我解决下面代码中的问题，因为我没有通过super.onDestroy()调用致命错误。

public class MainActivity extends Activity implements OnClickListener {

    public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    public void onActivityResult(int requestcode, int resultcode, Intent data){
        list_button.setImageResource(R.drawable.listbtn);
        super.onActivityResult(requestcode, resultcode, data);
        if (resultcode == 100){
    //*     Intent in3 = getIntent();
            int songnum = data.getExtras().getInt("songindex");
                playsong(songnum);
                player.start();
                play_button.setImageResource(R.drawable.play_aft);
                pause_button.setImageResource(R.drawable.pause_int);
                stop_button.setImageResource(R.drawable.stop_int);
        }
        seek_bar.setMax(player.getDuration());
    }

    private void playsong(int songnum) {
        try {
            player.reset();
            player.setDataSource(Songlist.get(songnum).get("songname"));
            player.prepare();
            seek_bar.setMax(player.getDuration());
            seekUpdation();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (Throwable e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

    Runnable run = new Runnable() { 
    @Override 
    public void run() { 
        seekUpdation(); 
    } 
    }; 
    public void seekUpdation() { 
        seek_bar.setProgress(player.getCurrentPosition()); 
        seekHandler.postDelayed(run, 1000); 
    } 
    public void onDestroy(){
        super.onDestroy();
        player.stop();
        player.release();
        Log.d(TAG, "Player Crushed");
    }    
    @Override 
    public void onClick(View view) { 
    switch (view.getId()) { 
    case R.id.play:
        text_shown.setText("Playing..."); 
        player.start();
        pause_button.setImageResource(R.drawable.pause_int);
        stop_button.setImageResource(R.drawable.stop_int);
        play_button.setImageResource(R.drawable.play_aft);
    break; 
    case R.id.pause: 
        if(player.isPlaying()){
            player.pause(); 
            text_shown.setText("Paused..."); 
            play_button.setImageResource(R.drawable.play_int);
            pause_button.setImageResource(R.drawable.pause_aft);
        }

    break;
    case R.id.stop:
        if(player.isPlaying()){
            player.stop();
            text_shown.setText("Stopped...");
            play_button.setImageResource(R.drawable.play_int);
            pause_button.setImageResource(R.drawable.pause_int);
            stop_button.setImageResource(R.drawable.stop_aft);
            player.prepareAsync();
            player.seekTo(0);
        }
        else{
            try {
                player.prepare();
                player.seekTo(0);
            } catch (IllegalStateException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    break;
    } 
}
}

logcat的

08-26 23:17:37.993: E/AndroidRuntime(437): FATAL EXCEPTION: main
08-26 23:17:37.993: E/AndroidRuntime(437): android.app.SuperNotCalledException: Activity {com.example.musicplay/com.example.musicplay.MainActivity} did not call through to super.onDestroy()
08-26 23:17:37.993: E/AndroidRuntime(437):  at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:2661)
08-26 23:17:37.993: E/AndroidRuntime(437):  at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:2690)
08-26 23:17:37.993: E/AndroidRuntime(437):  at android.app.ActivityThread.access$2100(ActivityThread.java:117)
08-26 23:17:37.993: E/AndroidRuntime(437):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:964)
08-26 23:17:37.993: E/AndroidRuntime(437):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-26 23:17:37.993: E/AndroidRuntime(437):  at android.os.Looper.loop(Looper.java:123)
08-26 23:17:37.993: E/AndroidRuntime(437):  at android.app.ActivityThread.main(ActivityThread.java:3683)
08-26 23:17:37.993: E/AndroidRuntime(437):  at java.lang.reflect.Method.invokeNative(Native Method)
08-26 23:17:37.993: E/AndroidRuntime(437):  at java.lang.reflect.Method.invoke(Method.java:507)
08-26 23:17:37.993: E/AndroidRuntime(437):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-26 23:17:37.993: E/AndroidRuntime(437):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-26 23:17:37.993: E/AndroidRuntime(437):  at dalvik.system.NativeStart.main(Native Method)
08-26 23:19:31.443: E/MediaPlayer(481): Attempt to call getDuration without a valid mediaplayer
08-26 23:19:31.443: E/MediaPlayer(481): error (-38, 0)
08-26 23:19:31.487: E/MediaPlayer(481): Error (-38,0)

Answer 1

您应该使用自己的super.onDestroy()方法拨打onDestroy() 最后：

public void onDestroy(){
    player.stop();
    player.release();
    Log.d(TAG, "Player Crushed");
    super.onDestroy();
}

我的假设是MediaPlayer需要Activity的上下文，因此在调用Activity和{{1}后必须销毁stop() }}

致命错误：supernotcalledexception

1 个答案: