当我尝试通过媒体播放两种声音时出错

Trần Đức Tâm 发表于 Dev

陈德Du

我尝试播放两个声音，但这是第二个声音结尾的错误。我尝试调试，但没有发现任何东西向我显示我的问题。

这是我的代码：

public class MainActivity extends Activity {
private MediaPlayer mp;
private int[] sound = new int[2];
private int currentSound = 0;

@Override
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        sound[0] = R.raw.sound_one;
        sound[1] = R.raw.sound_two;
        mp = MediaPlayer.create(this, sound[currentSound]);
        mp.setOnCompletionListener(new OnCompletionListener() {
        @Override
            public void onCompletion(MediaPlayer arg0) {
                if (currentSound < sound.length) {
                     currentSound++;
                     arg0 = MediaPlayer.create(getApplicationContext(),sound[currentSound]);
                     arg0.setOnCompletionListener(this);
                     arg0.start();
                }
        }
    }
});
mp.start();
}

杰扎克

当第一声音完成，currentSound < sound.length意味着0 < 2同样第二声音结束后currentSound < sound.length暗示1 < 2和进一步将其递增currentSound++所以现在它的值是2。因此arg0 = MediaPlayer.create(getApplicationContext(),sound[currentSound]);会抛出错误。sound[currentSound]是sound[2]。

移动currentSound++前if (currentSound < sound.length)

@Override
        public void onCompletion(MediaPlayer arg0) {
            currentSound++;
            if (currentSound < sound.length) {                   
                 arg0 = MediaPlayer.create(getApplicationContext(),sound[currentSound]);
                 arg0.setOnCompletionListener(this);
                 arg0.start();
            }
    }

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