MediaPlayer 之音乐循环播放器

  先说以下开发环境：Android sdk 2.2   target:android-8

 

AndroidManifest.xml:

 

"1.0" encoding="utf-8"?>
"http://schemas.android.com/apk/res/android"
      package="com.icox.android"
      android:versionCode="1"
      android:versionName="1.0">
    "8" />

    "@drawable/icon" android:label="@string/app_name">
        "MusicPlayer"
                  android:label="@string/app_name">

                "android.intent.action.MAIN" />
                "android.intent.category.LAUNCHER" />





    "WRITE_EXTERNAL_STORAGE">

 

 

/res/layout/main.xml:

 

 

"1.0" encoding="utf-8"?>
"http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    "@+id/mTextView" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:text="">
    "@+id/ll_list"
        android:orientation="vertical" android:layout_width="fill_parent"
        android:layout_height="wrap_content">
        "@+id/lv_music" android:layout_width="fill_parent"
            android:layout_height="wrap_content">


    "@+id/ll_btn"
        android:orientation="horizontal" android:layout_width="fill_parent"
        android:layout_height="wrap_content">
        "@+id/imgbtn_loop" android:src="@drawable/loop"
            android:background="#00000000" android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        "@+id/imgbtn_last" android:src="@drawable/last"
            android:background="#00000000" android:layout_width="wrap_content"
            android:layout_height="wrap_content">
        "@+id/imgbtn_start" android:src="@drawable/start"
            android:background="#00000000" android:layout_width="wrap_content"
            android:layout_height="wrap_content">

        "@+id/imgbtn_pause" android:src="@drawable/pause"
            android:background="#00000000" android:visibility="gone"
            android:layout_width="wrap_content" android:layout_height="wrap_content">

        "@+id/imgbtn_stop" android:src="@drawable/stop"
            android:layout_width="wrap_content" android:layout_height="wrap_content">
        "@+id/imgbtn_next" android:src="@drawable/next"
            android:background="#00000000" android:layout_width="wrap_content"
            android:layout_height="wrap_content">



    "@+id/ll_btn"
        android:orientation="vertical" android:layout_width="fill_parent"
        android:layout_height="wrap_content">

    "wrap_content" android:id="@+id/SeekBar01"
        android:layout_width="fill_parent">

 

    /res/drawable 目录下放需要的图片资源文件。skip...

 

 

 

 

 

MusicPlayer.java:

 

package com.icox.android;
import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.media.MediaPlayer.OnErrorListener;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.SeekBar;
import android.widget.TextView;


public class MusicPlayer extends Activity implements Runnable {
    /** Called when the activity is first created. */
    private MediaPlayer MediaPlayer = null;
    private SeekBar SeekBar = null;
    private ListView ListView = null;
    private ImageButton btnLast = null;
    private ImageButton btnStart = null;
    private ImageButton btnPause = null;
    private ImageButton btnStop = null;
    private ImageButton btnNext = null;
    private ImageButton btnLoop = null;
    private TextView TextView = null;
    private List MusicList = null;
    private int Current = 0;
    private int count = 0;
    private boolean isrun = false;
    private boolean isauto = false;
    private static final String PATH = "/sdcard/";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // setContentView(R.layout.music);
        setContentView(R.layout.main);
        ListView = (ListView) this.findViewById(R.id.lv_music);
        SeekBar = (SeekBar) this.findViewById(R.id.SeekBar01);
        TextView = (TextView) this.findViewById(R.id.mTextView);
        TextView.setText("Louisa 的迷你音乐播放器");
        btnLoop = (ImageButton) findViewById(R.id.imgbtn_loop);
        btnLast = (ImageButton) this.findViewById(R.id.imgbtn_last);
        btnStart = (ImageButton) this.findViewById(R.id.imgbtn_start);
        btnPause = (ImageButton) this.findViewById(R.id.imgbtn_pause);
        btnStop = (ImageButton) this.findViewById(R.id.imgbtn_stop);
        btnNext = (ImageButton) this.findViewById(R.id.imgbtn_next);
        MusicList = new ArrayList();
        MediaPlayer = new MediaPlayer();
        // 循环按钮
        btnLoop.setOnClickListener(new ImageButton.OnClickListener() {

            public void onClick(View v) {
                LoopMusic();
            }

        });

        // 开始按钮
        btnStart.setOnClickListener(new ImageButton.OnClickListener() {

            @Override
            public void onClick(View v) {
                PlayMusic(PATH + MusicList.get(Current));
            }

        });
        // 下一首
        btnNext.setOnClickListener(new ImageButton.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                NextMusic();
            }

        });
        // 上一首
        btnLast.setOnClickListener(new ImageButton.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                LastMusic();
            }

        });
        // 暂停
        btnPause.setOnClickListener(new ImageButton.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                isrun = true;
                isauto = false;
                btnStart.setVisibility(View.VISIBLE);// 显示启动按钮
                btnPause.setVisibility(View.GONE);// 隐藏暂停按钮

                // 是否正在播放
                if (MediaPlayer.isPlaying()) {
                    MediaPlayer.pause();
                }
            }

        });
        // 停止
        btnStop.setOnClickListener(new ImageButton.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                StopMusic();
            }

        });

        // 单击音乐播放列表，播放歌曲事件
        ListView.setOnItemClickListener(new ListView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView arg0, View arg1, int arg2,
                    long arg3) {
                Current = arg2;
                StopMusic();
                PlayMusic(PATH + MusicList.get(Current));
            }

        });

        SeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

            @Override
            public void onProgressChanged(SeekBar seekBar, int progress,
                    boolean fromUser) {
                if (!isauto) {
                    // int n = mMediaPlayer.getCurrentPosition();
                    // mMediaPlayer.pause();
                    MediaPlayer.seekTo(progress);
                    // mMediaPlayer.start();
                    // isauto = true;
                }

            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
                isauto = false;
            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                isauto = true;
            }

        });
        this.MusicList();
        new Thread(this).start();
    }

    public void PlayMusic(String path) {

        try {
            btnStart.setVisibility(View.GONE);// 隐藏启动按钮
            btnPause.setVisibility(View.VISIBLE);// 显示暂停按钮
            if (!isrun) {
                MediaPlayer.reset();// 重置
                MediaPlayer.setDataSource(path);// 设置数据源
                MediaPlayer.prepare();// 准备
                MediaPlayer.start();// 开始播放
                count = MediaPlayer.getDuration();
                Log.i("TAG-count", count + "");
                SeekBar.setMax(count);// 设置最大值.
                this.TextView.setText("当前播放歌曲:" + MusicList.get(Current));
                MediaPlayer
                        .setOnCompletionListener(new OnCompletionListener() {

                            @Override
                            public void onCompletion(MediaPlayer mp) {
                                // TODO Auto-generated method stub
                                NextMusic();
                            }

                        });
                MediaPlayer.setOnErrorListener(new OnErrorListener() {

                    @Override
                    public boolean onError(MediaPlayer mp, int what, int extra) {
                        ShowDialog("Error");
                        MediaPlayer.reset();
                        return true;
                    }

                });

            } else {
                MediaPlayer.start();// 暂停之后接着播放
            }
            isauto = true;
        } catch (Exception ex) {
            this.ShowDialog("播放音乐异常:" + ex.getMessage());
        }
    }

    public void LoopMusic(){
        isrun=true;
        if(btnLoop.isPressed()==true  && MediaPlayer.isPlaying()){
            MediaPlayer.setLooping(true);
            MediaPlayer.start();
        }

    }



    public void NextMusic() {
        int num = MusicList.size();
        if (++Current >= num) {
            Current = 0;
        }
        StopMusic();
        PlayMusic(PATH + MusicList.get(Current));

    }

    public void LastMusic() {
        int num = MusicList.size();
        if (--Current < 0) {
            Current = num - 1;
        }
        StopMusic();
        PlayMusic(PATH + MusicList.get(Current));

    }

    @Override
    protected void onPause() {
        super.onPause();
        isauto = false;
        if (MediaPlayer.isPlaying()) {
            MediaPlayer.stop();// 停止
        }
        MediaPlayer.reset();
        MediaPlayer.release();
        // mMediaPlayer = null;
    }

    public void StopMusic() {
        isrun = false;
        // isauto = false;
        btnPause.setVisibility(View.GONE);// 隐藏暂停按钮
        btnStart.setVisibility(View.VISIBLE);// 显示启动按钮

        if (MediaPlayer.isPlaying()) {
            MediaPlayer.stop();// 停止
        }
        // mSeekBar.setProgress(0);
    }



    // 关于循环播放的设置：
    // if (Common.PLAY_MODE_SINGLE_LOOP == mPlayMode) {
    // mMediaPlayer.setLooping(true); // 单曲循环
    // } else {
    // mMediaPlayer.setLooping(false); // 不循环播放
    // }
    // mMediaPlayer.start(); // 开始播放



    /**
     * 文件过滤器
     *
     * @author Louisa.Smart
     *
     */
    class MusicFilter implements FilenameFilter {

    @Override
    public boolean accept(File dir, String filename) {
        // TODO Auto-generated method stub
        return (filename.endsWith(".mp3"));
    }


    }

    /**
     * 播放列表
     */
    public void MusicList() {
        try {
            File home = new File(PATH);
            File[] f = home.listFiles(new MusicFilter());
            if (f.length > 0) {
                for (int i = 0; i < f.length; i++) {
                    File file = f[i];
                    MusicList.add(file.getName().toString());
                }
                ArrayAdapter adapter = new ArrayAdapter(this,
                        android.R.layout.simple_list_item_1, MusicList);
                ListView.setAdapter(adapter);
            }
        } catch (Exception ex) {
            this.ShowDialog("显示音乐列表异常:" + ex.getMessage());
        }

    }

    public void ShowDialog(String str) {
        new AlertDialog.Builder(this).setTitle("提示").setMessage(str)
                .setPositiveButton("OK", new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                    }

                }).show();
    }

    @Override
    public void run() {
        // TODO Auto-generated method stub
        while (true) {
            try {
                if (isauto) {
                    int n = MediaPlayer.getCurrentPosition();
                    Message msg = new Message();
                    msg.what = n;
                    handler.sendMessage(msg);
                }
                Thread.sleep(100);
            } catch (Exception ex) {
                ex.printStackTrace();
            }

        }
    }

    public Handler handler = new Handler() {
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            SeekBar.setProgress(msg.what);
            SeekBar.invalidate();
        }
    };

}

 

 

   run as android application 的时候请选择有sdcard 支持的模拟器，若放在真机里运行，请先确定设备是否是root 权限。

 

 

截图如下所示：