Android媒体播放器不会在复选框上停止

Question

我构建了一个小应用程序，它基本上会在选中复选框时振动并播放mp3文件，但不知何故，音乐在取消选中复选框后不会停止：

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final Vibrator vibrator = (Vibrator) MainActivity.this.getSystemService(Context.VIBRATOR_SERVICE);
        final CheckBox vibrateBoxStrong = (CheckBox) findViewById(R.id.checkPowerStrong);
        final Handler handler = new Handler();
        final Runnable r = new Runnable() {
            public void run() {
                vibrator.vibrate(1000);
                handler.postDelayed(this, 1000);
            }
        };
        vibrateBoxStrong.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
                    MediaPlayer mediaPlayer = MediaPlayer.create(getApplicationContext(), R.raw.fansound1);
                    if(vibrateBoxStrong.isChecked()) {
                        handler.postDelayed(r, 100);
                        mediaPlayer.start();
                    } else {
                        mediaPlayer.stop();
                        handler.removeCallbacks(r);
                        vibrator.cancel();
                    }
                }
            }
        );
    }
}

Answer 1

用于播放mp3

MediaPlayer mPlayer = MediaPlayer.create(context, R.raw.aaanicholas);

启动

mPlayer.start();

停止

mPlayer.stop();

在您的情况下，使用

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final Vibrator vibrator = (Vibrator) MainActivity.this.getSystemService(Context.VIBRATOR_SERVICE);
        MediaPlayer mPlayer = MediaPlayer.create(context, R.raw.aaanicholas);
        Vibrator v = (Vibrator) this.context.getSystemService(Context.VIBRATOR_SERVICE);
        final CheckBox vibrateBoxStrong = (CheckBox) findViewById(R.id.checkPowerStrong);

        vibrateBoxStrong.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
                    MediaPlayer mediaPlayer = MediaPlayer.create(getApplicationContext(), R.raw.fansound1);
                    if(vibrateBoxStrong.isChecked()) {
                        v.vibrate(1000);            // it will vibrate for 1000 milliseconds
                        mPlayer.start();         
                    } else {
                        mPlayer.stop();
                        vibrator.cancel();
                    }
                }
            }
        );
    }
}