如何在Android应用中播放和停止mp3文件

Question

我已经在eclipse中创建了一个应用来播放和停止mp3文件。 一切都很好，只不过当我播放音频文件并将其停止并想要重播时，播放btn不会出错！ 我想知道是否有人可以帮助我？ 提前致谢。 代码如下：

package ir.polyglotcenter.childrenmostfrequentwords;

import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class Main extends Activity {

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    //Related to the media player
    final MediaPlayer myMediaPlayer = MediaPlayer.create(Main.this, R.raw.audio);
    //Button related to play btn
    Button myButtonOne = (Button) findViewById(R.id.btn_audio);
    myButtonOne.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            myMediaPlayer.start();

        }
    });

    //Button related to stop btn
    Button myButtonTwo = (Button) findViewById(R.id.btn_stop);
    myButtonTwo.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            myMediaPlayer.stop();

        }
    });

}
}

Answer 1

如果要在按钮单击上开始/停止声音，然后使用MediaPlayer.start()和MediaPlayer.pause()暂停当前​​播放的声音，然后在单击开始按钮时重新开始。 并覆盖Activity onPause以最终停止并释放MediaPlayer。 在您的代码中进行如下更改：

onStop按钮单击：

myButtonTwo.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

            myMediaPlayer.pause();  //>>pause current sound
            myMediaPlayer.seekTo(0); //>> seek to start it again 

        }
    });

并覆盖Activity的onPause方法：

  @Override
   protected void onPause{
      super.onPause();
       myMediaPlayer.stop();  //>>> stop myMediaPlayer
       myMediaPlayer.release(); //>>> free myMediaPlayer
     }

Answer 2

尝试此操作（只需在公共区域定义Media Player）

    public class Main extends Activity {

MediaPlayer myMediaPlayer = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    //Related to the media player

    myMediaPlayer = MediaPlayer.create(Main.this, R.raw.audio);

    //Button related to play btn
    Button myButtonOne = (Button) findViewById(R.id.btn_audio);
    myButtonOne.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            myMediaPlayer.start();

        }
    });

    //Button related to stop btn
    Button myButtonTwo = (Button) findViewById(R.id.btn_stop);
    myButtonTwo.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            myMediaPlayer.pause();

        }
    });

}
}

Answer 3

Point是在if或any循环中实现MediaPlayer

public void onClick(View v) {
    // TODO Auto-generated method stub
    switch (v.getId()){
    case R.id.buttonPlay:
        //mp.reset();
        mp=MediaPlayer.create(Ur Context.this, R.raw."ursong.mp3");
        mp.start();

        break;
    case R.id.buttonStop:
        mp.stop();

        break;
    }
}

Answer 4

您必须移动以下代码：

final MediaPlayer myMediaPlayer = MediaPlayer.create(Main.this, R.raw.audio);

在：

myButtonOne.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
        final MediaPlayer myMediaPlayer = MediaPlayer.create(Main.this,R.raw.audio);
        myMediaPlayer.start();

    }
});