实现功能，播放，暂停，重置，进度条的使用
String文件：
MusicPlayer
歌曲：
播放
暂停
继续
重置
关闭
媒体文件不存在
SDCard不存在
MusicPlayer
歌曲：
播放
暂停
继续
重置
关闭
媒体文件不存在
SDCard不存在
布局：
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/music_name"/>
android:id="@+id/musicEt"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="a.mp3"
/>
android:id="@+id/seekBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="10000"
/>
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:stretchColumns="*">
android:id="@+id/playBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/play_text"/>
android:id="@+id/pauseBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/pause_text"/>
android:id="@+id/resetBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/reset_text"/>
android:id="@+id/stopBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/stop_text"/>
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/music_name" />
android:id="@+id/musicEt"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="a.mp3"
/>
android:id="@+id/seekBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="10000"
/>
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:stretchColumns="*" >
android:id="@+id/playBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/play_text" />
android:id="@+id/pauseBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/pause_text" />
android:id="@+id/resetBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/reset_text" />
android:id="@+id/stopBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/stop_text" />
Java源码：
packagecn.class3g.musicplayer;
importjava.io.File;
importjava.io.IOException;
importandroid.app.Activity;
importandroid.media.MediaPlayer;
importandroid.os.Bundle;
importandroid.os.Environment;
importandroid.os.Handler;
importandroid.util.Log;
importandroid.view.View;
importandroid.view.View.OnClickListener;
importandroid.widget.Button;
importandroid.widget.EditText;
importandroid.widget.SeekBar;
importandroid.widget.SeekBar.OnSeekBarChangeListener;
importandroid.widget.Toast;
publicclassMusicPlayerActivityextendsActivityimplementsOnClickListener,
OnSeekBarChangeListener {
privatestaticfinalString TAG ="MusicPlayerActivity";
EditText musicEt;
Button playBtn, pauseBtn, resetBtn, stopBtn;
Handler handler = null;
Handler fHandler = null;
MediaPlayer player = null;
SeekBar seekbar = null;
publicvoidonCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
player = newMediaPlayer();
findViews();
}
privatevoidfindViews() {
musicEt = (EditText) this.findViewById(R.id.musicEt);
playBtn = (Button) this.findViewById(R.id.playBtn);
pauseBtn = (Button) this.findViewById(R.id.pauseBtn);
resetBtn = (Button) this.findViewById(R.id.resetBtn);
stopBtn = (Button) this.findViewById(R.id.stopBtn);
seekbar = (SeekBar) this.findViewById(R.id.seekBar);
playBtn.setOnClickListener(this);
pauseBtn.setOnClickListener(this);
resetBtn.setOnClickListener(this);
stopBtn.setOnClickListener(this);
seekbar.setOnSeekBarChangeListener(this);
}
publicvoidonClick(View v) {
String fileName = musicEt.getText().toString();
// 确定sdcard状态是否为已加载
if(Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
File file = newFile(Environment.getExternalStorageDirectory(),
fileName);
// 判断所播放的媒体文件是否存在
if(file.exists()) {
try{
switch(v.getId()) {
caseR.id.playBtn:
playMusic(file);
break;
caseR.id.pauseBtn:
if(player.isPlaying()) {
player.pause();
pauseBtn.setText(R.string.continue_text);
} else{
player.start();
pauseBtn.setText(R.string.pause_text);
}
break;
caseR.id.resetBtn:
if(player.isPlaying()) {
player.seekTo(0);
} else{
playMusic(file);
}
break;
caseR.id.stopBtn:
if(player.isPlaying()) {
player.stop();
}
break;
}
} catch(Exception e) {
Log.e(TAG, e.toString());
}
} else{
Toast.makeText(this, R.string.notfoundfile_text,
Toast.LENGTH_SHORT).show();
}
} else{
Toast.makeText(this, R.string.notfoundSdcard_text,
Toast.LENGTH_SHORT).show();
}
}
protectedvoidonDestroy() {
if(player !=null) {
if(player.isPlaying()) {
player.stop();
}
player.release();
}
super.onDestroy();
}
protectedvoidonPause() {
if(player !=null) {
if(player.isPlaying()) {
player.pause();
}
}
super.onPause();
}
protectedvoidonResume() {
if(player != null) {
if(!player.isPlaying()) {
player.start();
}
}
super.onResume();
}
privatevoidplayMusic(File file)throwsIllegalArgumentException,
IllegalStateException, IOException {
if(player != null) {
player.reset();
player.setDataSource(file.getAbsolutePath());
player.prepare();
player.start();
seekbar.setMax(player.getDuration());
Log.i(TAG, String.valueOf(player.getDuration()));
newThread(newseekBar()).start();
}
}
classseekBarimplementsRunnable {
intposition =0;
publicvoidrun() {
while(player !=null) {
position = player.getCurrentPosition();
seekbar.setProgress(position);
try{
Thread.sleep(100);
} catch(InterruptedException e) {
Log.e(TAG, e.toString());
}
}
}
}
publicvoidonProgressChanged(SeekBar seekBar,intprogress,
booleanfromUser) {
if(fromUser)
player.seekTo(progress);
}
publicvoidonStartTrackingTouch(SeekBar seekBar) {
}
publicvoidonStopTrackingTouch(SeekBar seekBar) {
}
}
