onPause() 和 onStop() 不起作用

Question

public class PhrasesActivity extends AppCompatActivity {
    MediaPlayer mediaPlayer;
    private MediaPlayer.OnCompletionListener onCompletionListener = new MediaPlayer.OnCompletionListener(){
        @Override
        public void onCompletion(MediaPlayer mediaPlayer) {
            releaseMediaPlayer();
        }
    };

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

        final ArrayList<Word> words = new ArrayList<Word>();

#some Word elements added
        WordAdapter wordAdapter = new WordAdapter(this, words, R.color.category_phrases);
        ListView listView = (ListView)findViewById(R.id.numberlist);
        listView.setAdapter(wordAdapter);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener(){
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                Toast.makeText(PhrasesActivity.this, "Demo", Toast.LENGTH_SHORT).show();
                Word word = words.get(i);
                releaseMediaPlayer();
                mediaPlayer = MediaPlayer.create(PhrasesActivity.this, word.getAudioResourceID());
                mediaPlayer.start();
                mediaPlayer.setOnCompletionListener(onCompletionListener);
            }
        });
    }

@Override
protected void onPause() {
    super.onPause();
    Log.v("PhrasesActivity", "onPause: Paused");
    releaseMediaPlayer();
}

@Override
protected void onStop() {
    super.onStop();
    Log.v("PhrasesActivity", "onPause: Stopped");
    releaseMediaPlayer();
}

    private void releaseMediaPlayer(){
        if(mediaPlayer!= null){
            mediaPlayer.release();
            mediaPlayer= null;
        }
    }
}

此代码在我的应用程序的子活动中不起作用。我尝试过检查日志Log.v()，但是什么也没发生。没有创建日志。 编辑 - 我尝试仅使用 onPause() 方法。这也没有帮助我解决问题。

Answer 1

代码错误在于调用 super.onStop()/super.onPause(); 之前使用所需指令语句的顺序；

@Override
protected void onPause() {
    // super.onPause();
    Log.v("PhrasesActivity", "onPause: Paused");
    releaseMediaPlayer();
    super.onPause();
}

@Override
protected void onStop() {
    // super.onStop();
    Log.v("PhrasesActivity", "onPause: Stopped");
    releaseMediaPlayer();
    super.onStop();
}

一般来说，在java中我们首先调用super(); 在重写的方法中，然后继续进一步的代码编写。我不明白为什么这里不遵循它，但更改上面的代码帮助我解决了问题。

感谢穆罕默德·阿提夫的帮助！