使图像按钮开始、停止和重新启动

Question

Literally started coding for the first time just about 2 weeks ago, so I apologize if my description of the problem might be confusing, but I will try.

I've created an imageButton and when press it I want this to happen:

• First Click = Start playing a random audio.
• Second Click = Stop the current audio playing.

I want this to go in a infinite loop.

Start random audio -> Stop audio - > Start random audio...

But with my code (see image) https://i.stack.imgur.com/2kO9i.png

what it does right now is:

• First Click = Start playing random audio.
• Second Click = Stop playing audio and restarts the whole class.

I've tried numerous ways to change the Intent or using a switch instead. But I can't get it to go into a loop.

Answer 1

您不需要在这里循环，您可以做的是将一个boolean设置为boolean值，如果正在播放音乐，则为true；如果停止则为false，这是对的吗？

Answer 2

You can simply do this :

// Delcare a boolean as an attribute to be accessible inside the listener
private boolean isPlaying = false;

// Inside onCreate(), set a listener on your Button myButton
Mediaplayer mp = MediaPlayer.create(this, R.raw.yourfile);
myButton.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
      if (!isPlaying) {
         // Not playing music
         // START RANDOM MUSIC with mp.start()
         mp.start()
         isPlaying = true;
      }
      else {
         // Playing music
         // STOP CURRENT PLAYED MUSIC with mp.stop()
         mp.stop()
         isPlaying = false;
      }      
    }
  }); 

EDIT : MediaPlayer class has a method for this !

// Inside onCreate(), set a listener on your Button myButton
Mediaplayer mp = MediaPlayer.create(this, R.raw.yourfile);
myButton.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
      if (!mp.isPlaying()) {
         // Not playing music
         // START RANDOM MUSIC with mp.start()
         mp.start()
      }
      else {
         // Playing music
         // STOP CURRENT PLAYED MUSIC with mp.stop()
         mp.stop()
      }      
    }
  }); 

Best

Answer 3

In your case, no need to add any extra variable, change your code to.

public class MainActivity extends Activity {

    private final int[] SOUNDS = {R.raw.blizzardlowquaility, R.raw.onebite_dansgaming, R.raw.nagur_dansgaming};
    private final int LOW = 0;
    private final int HIGH = 3;

    private MediaPlayer mMediaPlayer;

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

        ImageButton Testy = findViewById(R.id.imageButton);
        Testy.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mMediaPlayer == null) {
                    int random = (new Random()).nextInt(HIGH - LOW) + LOW;
                    mMediaPlayer = MediaPlayer.create(getApplicationContext(), SOUNDS[random]);
                    mMediaPlayer.start();
                } else {
                    mMediaPlayer.stop();
                    mMediaPlayer.release();
                    mMediaPlayer = null;
                }
            }
        });
    }
}