首先，說明我們是從sd卡里讀文件，來播放文件！！

1、效果圖：

提前工作，往sd卡里放音樂文件，如圖：

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類 [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;//互斥變量，防止定時器與SeekBar拖動時進度沖突???

????public?void?onCreate(Bundle?savedInstanceState)?{??

????????super.onCreate(savedInstanceState);??

????????setContentView(R.layout.main);??

????????player?=?new?MediaPlayer();??

????????findViews();//?各組件??

????}??

??

????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);??

????????????//?判斷有沒有要播放的文件??

????????????if?(file.exists())?{??

????????????????switch?(v.getId())?{??

????????????????case?R.id.play_pause:??

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

????????????????????????play_pause.setText("暫停");??

????????????????????????if?(!iffirst)?{??

????????????????????????????player.reset();??

????????????????????????????try?{??

????????????????????????????????player.setDataSource(file.getAbsolutePath());??

????????????????????????????????player.prepare();//?準備??

??

????????????????????????????}?catch?(IllegalArgumentException?e)?{??

????????????????????????????????e.printStackTrace();??

????????????????????????????}?catch?(IllegalStateException?e)?{??

????????????????????????????????e.printStackTrace();??

????????????????????????????}?catch?(IOException?e)?{??

????????????????????????????????e.printStackTrace();??

????????????????????????????}??

????????????????????????????seekbar.setMax(player.getDuration());//設置進度條??

????????????????????????????//----------定時器記錄播放進度---------//????

????????????????????????????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();//?開始??

????????????????????????ifplay?=?true;??

????????????????????}?else?if?(ifplay)?{??

????????????????????????play_pause.setText("繼續");??

????????????????????????player.pause();??

????????????????????????ifplay?=?false;??

????????????????????}??

????????????????????break;??

????????????????case?R.id.reset:??

????????????????????if?(ifplay)?{??

????????????????????????player.seekTo(0);??

????????????????????}?else?{??

????????????????????????player.reset();??

????????????????????????try?{??

????????????????????????????player.setDataSource(file.getAbsolutePath());??

????????????????????????????player.prepare();//?準備??

????????????????????????????player.start();//?開始??

????????????????????????}?catch?(IllegalArgumentException?e)?{??

????????????????????????????e.printStackTrace();??

????????????????????????}?catch?(IllegalStateException?e)?{??

????????????????????????????e.printStackTrace();??

????????????????????????}?catch?(IOException?e)?{??

????????????????????????????e.printStackTrace();??

????????????????????????}??

????????????????????}??

????????????????????break;??

????????????????}??

????????????}??

????????}??

????}??

????//進度條處理??

????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;????

????????}??

??

????}??

????//來電處理??

????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();??

????}??

??

}?

總結

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