Java 每6-10秒播放一次声音

你如何每6-10秒重复一个声音，也就是说在6到10之间的随机间隔？那么声音播放6，然后是7，6，10等等？到目前为止，我有这个，它的工作方式，我想和播放声音“一次”，并改变屏幕上的按钮。但是，要再次播放声音，我必须单击按钮“停止”，然后再次单击“继续”。我想点击然后按钮，让声音每6-10秒重复一次，直到你点击停止按钮

public class MainActivity extends ActionBarActivity {

MediaPlayer myMediaPlayer = null;


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

    final MediaPlayer myMediaPlayer = MediaPlayer.create(this, R.raw.whistle);
    Timer soundTimer = new Timer();

    Random r = new Random();


    //Button related to play btn
    final Button startStopButton = (Button) findViewById(R.id.startstopbutton);
    startStopButton.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

            if (startStopButton.getText().equals("Start")) {
                //start the sound


                //change button color and text
                startStopButton.setText("Stop");
                startStopButton.setBackgroundColor(Color.RED);

                myMediaPlayer.start();



            } else  {
                //stop whistle

                //change button color and text
                startStopButton.setText("Start");
                startStopButton.setBackgroundColor(Color.GREEN);




            }


        }
    });

}

---

您可以得到一个介于6和10之间的随机数，如下所示：

int max = 10;
int min = 6;
int randomNum = new Random().nextInt((max - min) + 1) + min;
int seconds = randomNum * 1000;

以下是每6到10秒播放一次声音的示例：

private final Random mRandom = new Random();

private final Handler mHandler = new Handler();

private MediaPlayer mPlayer;

private boolean mKeepPlaying = true;

private void playMySound() {
    if (mPlayer == null) {
        mPlayer = MediaPlayer.create(this, R.raw.whistle);
    }
    int delayMillis = 1000 * mRandom.nextInt(5) + 6; // random number between 6 and 10
    mHandler.postDelayed(new Runnable() {
        @Override
        public void run() {
            if (isFinishing()) {
                // Check if the Activity is finishing.
                return;
            }
            mPlayer.start();
            if (mKeepPlaying) {
                // play the sound again in 6 to 10 seconds
                playMySound();
            }
        }
    }, delayMillis);
}

---

只需调用

playMySound（）onCreate（Bundle）

中进行编码>并在需要停止时切换

mKeepPlaying

。

您可以使用MediaPlayer.OnCompletionListener来完成此操作，每当播放完成时，获取一个介于6和10之间的随机数，并在计算出的随机时间后发布一个runnable以再次开始播放

下面是一个这样做的例子

public class MainActivity extends Activity {
Button button1;
MediaPlayer mediaPlayer = null;
private final Random mRandom = new Random();
int delayMillis;
Handler handler;
Runnable runnable;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    button1 = (Button) findViewById(R.id.button1);
    handler = new Handler();
    runnable = new Runnable() {

        @Override
        public void run() {
            mediaPlayer.start();

        }
    };
    button1.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            toggleMediaPlayer();

        }
    });
}

private void toggleMediaPlayer(){
    if(mediaPlayer != null){
            mediaPlayer.stop();
            mediaPlayer.release();
            mediaPlayer=null;
            handler.removeCallbacks(runnable);
    }else{
        mediaPlayer = MediaPlayer.create(this, R.raw.hangouts_incoming_call);
        mediaPlayer.setOnPreparedListener(new OnPreparedListener() {

            @Override
            public void onPrepared(MediaPlayer mp) {
                mp.start();

            }
        });
        mediaPlayer.setOnCompletionListener(new OnCompletionListener() {

            @Override
            public void onCompletion(MediaPlayer mp) {
                delayMillis = 1000 * mRandom.nextInt(5) + 6;
                handler.postDelayed(runnable,delayMillis);
            }
        });

    }
}}

---

希望这能有所帮助。

您可以创建一个

TimerTask

来播放媒体，并计划一个

计时器，随机延迟。为什么要一次又一次地创建MediaPlayer？是的，您可以避免一次又一次地创建MediaPlayer，只要记住调用MediaPlayer.prepare（）在通过mediaPlayer停止媒体播放器后再次启动媒体播放器之前。停止（）