Android之MediaPlayer播放音乐并实现进度条实例

首先，说明我们是从sd卡里读文件，来播放文件！！

1、效果图：

提前工作，往sd卡里放音乐文件，如图：

2、布局文件main.xml

[html] view plain copy

<?xml version="1.0" encoding="utf-8"?>  

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  

    android:layout_width="fill_parent"  

    android:layout_height="fill_parent"  

    android:orientation="vertical" >  

    <TextView   

        android:layout_width="wrap_content"  

        android:layout_height="wrap_content"  

        android:text="歌曲名："/>  

    <TextView   

        android:layout_width="wrap_content"  

        android:layout_height="wrap_content"  

        android:text="blueflawer.mp3"/>  

    <Button   

        android:layout_width="wrap_content"  

        android:layout_height="wrap_content"  

        android:text="播放"  

        android:id="@+id/play_pause"/>  

    <Button   

        android:layout_width="wrap_content"  

        android:layout_height="wrap_content"  

        android:text="重置"  

        android:id="@+id/reset"/>  

    <SeekBar   

        android:layout_width="fill_parent"  

        android:layout_height="wrap_content"  

        android:id="@+id/seekbar"/>  

</LinearLayout>  

3、activity类 [java] view plain copy

package cn.csdn.activity;  

  

import java.io.File;  

import java.io.IOException;  

import java.util.Timer;  

import java.util.TimerTask;  

  

import android.app.Activity;  

import android.media.MediaPlayer;  

import android.os.Bundle;  

import android.os.Environment;  

import android.view.View;  

import android.view.View.OnClickListener;  

import android.widget.Button;  

import android.widget.SeekBar;  

import android.widget.SeekBar.OnSeekBarChangeListener;  

  

public class MyPlayerActivity extends Activity {  

    private Button play_pause, reset;  

    private SeekBar seekbar;  

    private boolean ifplay = false;  

    private MediaPlayer player = null;  

    private String musicName = "blueflawer.mp3";  

    private boolean iffirst = false;  

    private Timer mTimer;    

    private TimerTask mTimerTask;   

    private boolean isChanging=false;//互斥变量，防止定时器与SeekBar拖动时进度冲突   

    public void onCreate(Bundle savedInstanceState) {  

        super.onCreate(savedInstanceState);  

        setContentView(R.layout.main);  

        player = new MediaPlayer();  

        findViews();// 各组件  

    }  

  

    private void findViews() {  

        play_pause = (Button) findViewById(R.id.play_pause);  

        reset = (Button) findViewById(R.id.reset);  

        play_pause.setOnClickListener(new MyClick());  

        reset.setOnClickListener(new MyClick());  

  

        seekbar = (SeekBar) findViewById(R.id.seekbar);  

        seekbar.setOnSeekBarChangeListener(new MySeekbar());  

    }  

  

    class MyClick implements OnClickListener {  

        public void onClick(View v) {  

            File file = new File(Environment.getExternalStorageDirectory(),  

                    musicName);  

            // 判断有没有要播放的文件  

            if (file.exists()) {  

                switch (v.getId()) {  

                case R.id.play_pause:  

                    if (player != null && !ifplay) {  

                        play_pause.setText("暂停");  

                        if (!iffirst) {  

                            player.reset();  

                            try {  

                                player.setDataSource(file.getAbsolutePath());  

                                player.prepare();// 准备  

  

                            } catch (IllegalArgumentException e) {  

                                e.printStackTrace();  

                            } catch (IllegalStateException e) {  

                                e.printStackTrace();  

                            } catch (IOException e) {  

                                e.printStackTrace();  

                            }  

                            seekbar.setMax(player.getDuration());//设置进度条  

                            //----------定时器记录播放进度---------//    

                            mTimer = new Timer();    

                            mTimerTask = new TimerTask() {    

                                @Override    

                                public void run() {     

                                    if(isChanging==true) {   

                                        return;    

                                    }  

                                    seekbar.setProgress(player.getCurrentPosition());  

                                }    

                            };   

                            mTimer.schedule(mTimerTask, 0, 10);   

                            iffirst=true;  

                        }  

                        player.start();// 开始  

                        ifplay = true;  

                    } else if (ifplay) {  

                        play_pause.setText("继续");  

                        player.pause();  

                        ifplay = false;  

                    }  

                    break;  

                case R.id.reset:  

                    if (ifplay) {  

                        player.seekTo(0);  

                    } else {  

                        player.reset();  

                        try {  

                            player.setDataSource(file.getAbsolutePath());  

                            player.prepare();// 准备  

                            player.start();// 开始  

                        } catch (IllegalArgumentException e) {  

                            e.printStackTrace();  

                        } catch (IllegalStateException e) {  

                            e.printStackTrace();  

                        } catch (IOException e) {  

                            e.printStackTrace();  

                        }  

                    }  

                    break;  

                }  

            }  

        }  

    }  

    //进度条处理  

    class MySeekbar implements OnSeekBarChangeListener {  

        public void onProgressChanged(SeekBar seekBar, int progress,  

                boolean fromUser) {  

        }  

  

        public void onStartTrackingTouch(SeekBar seekBar) {  

            isChanging=true;    

        }  

  

        public void onStopTrackingTouch(SeekBar seekBar) {  

            player.seekTo(seekbar.getProgress());  

            isChanging=false;    

        }  

  

    }  

    //来电处理  

    protected void onDestroy() {  

        if(player != null){  

            if(player.isPlaying()){  

                player.stop();  

            }  

            player.release();  

        }  

        super.onDestroy();  

    }  

  

    protected void onPause() {  

        if(player != null){  

            if(player.isPlaying()){  

                player.pause();  

            }  

        }  

        super.onPause();  

    }  

  

    protected void onResume() {  

        if(player != null){  

            if(!player.isPlaying()){  

                player.start();  

            }  

        }  

        super.onResume();  

    }  

  

} 

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