java - 通过按返回或主页按钮停止mediaplayer声音

Question

我得到了切换和新的布局，谢谢大家。最后一个问题。如果用户按下“后退”或“主页”按钮，我希望音乐停止播放。这是代码，我不知道我缺少什么。

package com.androidsleepmachine.gamble;

import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;

public class Ocean extends Activity implements View.OnClickListener {
 public static final Integer[] TIME_IN_MINUTES = { 30, 45, 60, 180, 360 };
public MediaPlayer mediaPlayer;
public Handler handler = new Handler();
public Button button1;
public Spinner spinner1;

// Initialize the activity
@Override
public void onCreate(Bundle bundle) {
    super.onCreate(bundle);
    setContentView(R.layout.ocean);

    button1 = (Button) findViewById(R.id.btn1);
    button1.setOnClickListener(this);
    spinner1 = (Spinner) findViewById(R.id.spinner1);
    ArrayAdapter<Integer> adapter = new ArrayAdapter<Integer>(this,  
android.R.layout.simple_spinner_item, TIME_IN_MINUTES);          
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);          
    spinner1.setAdapter(adapter); 
}

// Play the sound and start the timer
private void playSound(int resourceId) {
    // Cleanup any previous sound files
    cleanup();
    // Create a new media player instance and start it
    mediaPlayer = MediaPlayer.create(this, resourceId);
    mediaPlayer.start();
    // Create the timer to stop the sound after x number of milliseconds
    int selectedTime = TIME_IN_MINUTES[spinner1.getSelectedItemPosition()];
    handler.postDelayed(runnable, selectedTime * 60 * 1000);
}

// Handle button callback
@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.btn1:
            playSound(R.raw.ocean_birds);
            break;
    }
}

// Stop the sound and cleanup the media player
public void cleanup() {
    if (mediaPlayer != null) {
        mediaPlayer.stop();
        mediaPlayer.release();
        mediaPlayer = null;
    }
    // Cancel any previously running tasks
    handler.removeCallbacks(runnable);
}

// Runnable task used by the handler to stop the sound
public Runnable runnable = new Runnable() {
    public void run() {
        cleanup();
    }
};
}

Logcat

09-18 00:28:59.000: E/AndroidRuntime(1627): android.app.SuperNotCalledException:  
Activity {com.androidsleepmachine.gamble/com.androidsleepmachine.gamble.Ship} did not 
call through to super.onStop()
09-18 00:28:59.000: E/AndroidRuntime(1627):     at 
android.app.Activity.performStop(Activity.java:5148)
09-18 00:28:59.000: E/AndroidRuntime(1627):     at   
android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3232)
09-18 00:28:59.000: E/AndroidRuntime(1627):     at   
android.os.Handler.dispatchMessage(Handler.java:99)
09-18 00:28:59.000: E/AndroidRuntime(1627):     at 
android.os.Looper.loop(Looper.java:137)
09-18 00:28:59.000: E/AndroidRuntime(1627):     at  
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
09-18 00:28:59.000: E/AndroidRuntime(1627):     at     
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)

Answer 1

您需要检查是用户关闭了应用程序还是只是切换到另一个 Activity 。
您可以查看我的答案

Answer1

Answer2

希望能帮助到你!!

编辑

在ship类中检查这两种方法。

 @Override
    protected void onStop() {
        Log.d(TAG, "App stopped");

        super.onStop();
    }

    @Override
    protected void onDestroy() {
        Log.d(TAG, "App destoryed");

        super.onDestroy();
    }