AudioActivity

最新推荐文章于 2025-08-16 22:13:48 发布

转载最新推荐文章于 2025-08-16 22:13:48 发布 · 130 阅读

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原文链接：https://my.oschina.net/donghu/blog/9815

文章标签：

#移动开发 #java

本文详细介绍了一个基于Android平台的简单音频播放器实现过程。该播放器具备播放、暂停、停止等功能，并通过SeekBar实现了进度控制及调整。文章通过具体代码展示了如何使用Android的MediaPlayer进行音频文件的加载与播放。

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package com.media;

import java.io.IOException;

import android.app.Activity;
import android.app.AlertDialog;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.widget.ImageButton;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class AudioActivity extends Activity implements OnCompletionListener{
private ImageButton play,pause,stop;
private MediaPlayer mp;
TextView textView;
SeekBar seekbar;

private Handler mHandler;

private Runnable update = new Runnable() {
         public void run() {
         int position = mp.getCurrentPosition();
             int mMax = mp.getDuration();
             int sMax = seekbar.getMax();
             int time=position*sMax/mMax;
//             System.out.println("update position="+position);
//                System.out.println("update mMax="+mMax);
//                System.out.println("update sMax="+sMax);
//                System.out.println("update time="+time);
             textView.setText(time+"%");
             seekbar.setProgress(time);
         seekbar.postInvalidate();
             mHandler.postDelayed(update, 1000);
         }
     };
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.audio);

        mHandler = new Handler();
        mHandler.post(update);

        textView = (TextView)findViewById(R.id.audio_textview);
        play = (ImageButton)findViewById(R.id.play);
        pause = (ImageButton)findViewById(R.id.pause);
        stop = (ImageButton)findViewById(R.id.stop);
        seekbar=(SeekBar)findViewById(R.id.seekb);

        play.setOnClickListener(new View.OnClickListener() {
   public void onClick(View view) {
    play();
   }
  });

  pause.setOnClickListener(new View.OnClickListener() {
   public void onClick(View view) {
    pause();
   }
  });

  stop.setOnClickListener(new View.OnClickListener() {
   public void onClick(View view) {
    stop();
   }
  });
  seekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener(){
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress,
                    boolean fromUser) {
            }
            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
            }
            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                // TODO Auto-generated method stub
                int dest = seekBar.getProgress(); //获得SeekBar拖动后的数值
                int mMax = mp.getDuration(); //获得整个音频的播放周期(时间)
                int sMax = seekbar.getMax();//获得SeekBar的最大值
                int position=mMax*dest/sMax;//计算音频的播放位置   dest/sMax是百分比
                System.out.println("dest="+dest);
                System.out.println("mMax="+mMax);
                System.out.println("sMax="+sMax);
                System.out.println("position="+position);
                mp.seekTo(position);

            }

        });

  setup();
    }

    @Override
public void onDestroy() {
  super.onDestroy();
  if (stop.isEnabled()) {
   stop();
  }
}

private void play() {
  mp.start();
  play.setEnabled(false);
  pause.setEnabled(true);
  stop.setEnabled(true);
}

private void stop() {
  mp.stop();
  pause.setEnabled(false);
  stop.setEnabled(false);
  try {
   mp.prepare();
   mp.seekTo(0);
   play.setEnabled(true);
  }
  catch (Throwable t) {
   error(t);
  }
}

private void pause() {
  mp.pause();
  play.setEnabled(true);
  pause.setEnabled(false);
  stop.setEnabled(true);
}

private void loadClip() {
  try {
//   mp=MediaPlayer.create(this, R.raw.when_you_believe);
   mp=new MediaPlayer();
   mp.setOnCompletionListener(this);
   mp.setDataSource("/sdcard/test.mp3");
   mp.prepare();
  }
  catch (Throwable t) {
   error(t);
  }
}

private void setup() {
  loadClip();
  play.setEnabled(true);
  pause.setEnabled(false);
  stop.setEnabled(false);
}

private void error(Throwable t) {
  AlertDialog.Builder builder=new AlertDialog.Builder(this);
  builder
   .setTitle("报错啦!")
   .setMessage(t.toString())
   .setPositiveButton("确定", null)
   .show();
}

@Override
public void onCompletion(MediaPlayer mp1) {
  Log.d("mediaplayer","onCompletion");
//  mp.seekTo(0);
  mp.start();
  play.setEnabled(true);
  pause.setEnabled(false);
  stop.setEnabled(false);
}
}

转载于:https://my.oschina.net/donghu/blog/9815