Question

我有一个媒体播放器，可以在下面的活动中播放音乐。问题是，音乐转移到所有其他活动，这很好。但是当我开始音乐，去另一个活动，然后回到下面的活动，togglebutton已经从开启变为关闭。因此，如果我点击togglebutton，即使音乐仍在播放，音乐也会重新开始，所以现在音乐一次播放两次！如何让togglebutton知道音乐正在播放，所以当我回到活动时，togglebutton是＆＃34; on＆＃34;从最开始？它＆＃34;关＆＃34;默认情况下。

public class SpelaActivity extends Activity {

@Override
protected void onCreate (Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_spela);

    final MediaPlayer mediaPlayer = MediaPlayer.create(getBaseContext(), R.raw.ljudfil);

    ToggleButton musikknapp = (ToggleButton) findViewById(R.id.togglemusik);
    musikknapp.setOnCheckedChangeListener (new CompoundButton.OnCheckedChangeListener() {
    public void onCheckedChanged(CompoundButton buttonView,
            boolean isChecked) {
        if (isChecked) {
            mediaPlayer.start();
        } else {
            mediaPlayer.pause();
        }
    }
});
    mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
        @Override
        public void onCompletion(MediaPlayer mediaPlayer) {
            mediaPlayer.release();
        }
    });

}
}

Answer 1

您需要保存ToggleButton状态。试试这段代码：

public class MainActivity extends Activity {

    private ToggleButton toggleButton;
    private static Bundle bundle = new Bundle();
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        toggleButton = (ToggleButton)findViewById(R.id.toggleButton1);
    }



    @Override
    public void onPause() {
        super.onPause();
        bundle.putBoolean("ToggleButtonState", toggleButton.isChecked());
    }

    @Override
    public void onResume() {
        super.onResume();
        toggleButton.setChecked(bundle.getBoolean("ToggleButtonState",false));
    }

Answer 2

添加这些条件if(!mediaPlayer.isPlaying())

 public void onCheckedChanged(CompoundButton buttonView,
                boolean isChecked) {
            if (isChecked) {
                if(!mediaPlayer.isPlaying())
                mediaPlayer.start();
            } else {
                if(!mediaPlayer.isPlaying())
                mediaPlayer.pause();
            }
        }

Answer 3

管理以让媒体播放器在后退按钮点击时停止：

final ToggleButton togglemusik = (ToggleButton) findViewById(R.id.togglemusik);
    mp = MediaPlayer.create(this, R.raw.ljudfil);
    togglemusik.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (togglemusik.isChecked()) {
                mp.start();
            } else {
                mp.pause();
            }   
        }
    });
}
    @Override
    public void onPause() {
        super.onPause();
        if (mp !=null) {
            mp.release();
            mp = null;
        }
        }

ToggleButton让媒体播放器一次播放两次

3 个答案: