Android简单实现音乐播放器

Android老师的小作业。让使用Android的service实现音乐播放器。话不多说，直接上代码

首先你要有一个主MainActivity

package com.example.musicplayer;

import org.w3c.dom.Text;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.text.TextUtils;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.SeekBar;
import android.widget.Toast;

import com.example.musicplayer.MusicSevice.MyBinder;

public class MainActivity extends Activity implements OnClickListener {

private EditText path;
private Intent intent;
private myConn conn;
MyBinder binder;
private SeekBar mSeekBar;
private Thread mThread;
private Handler handler=new Handler(){
public void handleMessage(android.os.Message msg){
switch(msg.what){

case 100:
int currentPosition=(Integer) msg.obj;
mSeekBar.setProgress(currentPosition);
break;

default:
break;
}
}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

path=(EditText) findViewById(R.id.et_inputpath);
findViewById(R.id.bt_play).setOnClickListener(this);
findViewById(R.id.bt_pause).setOnClickListener(this);
findViewById(R.id.bt_replay).setOnClickListener(this);
findViewById(R.id.bt_stop).setOnClickListener(this);
mSeekBar=(SeekBar) findViewById(R.id.seekBar1);
conn=new myConn();
intent=new Intent(this,MusicSevice.class);
bindService(intent, conn, BIND_AUTO_CREATE);

}

//初始化进度条长度,获取音乐文件长度
private void initSeekBar(){
int musicWidth=binder.getMusicWidth();
mSeekBar.setMax(musicWidth);
}

//更新音乐播放进度
private void updateProgress(){
mThread=new Thread(){
public void run(){
while(!interrupted()){
//调用服务中的获取当前播放进度
int currentPosition =binder.getCurrentPosition();
Message message=Message.obtain();
message.obj=currentPosition;
message.what=100;
handler.sendMessage(message);
}
}
};
mThread.start();
}

private class myConn implements ServiceConnection{

@Override
public void onServiceConnected(ComponentName name, IBinder service) {
binder=(MyBinder) service;
}

@Override
public void onServiceDisconnected(ComponentName arg0) {
// TODO Auto-generated method stub

}

}

@Override
public void onClick(View v) {

String pathway=path.getText().toString().trim();
String path="data/data/com.example.musicplayer/1.mp3";
switch (v.getId()) {
case R.id.bt_play:
if(!TextUtils.isEmpty(path)){
binder.palys(path);
initSeekBar();
updateProgress();
}else{
Toast.makeText(this, "找不到音乐文件", 0).show();
}
break;
case R.id.bt_pause:
binder.pauses();
break;
case R.id.bt_replay:
binder.repalys(pathway);
break;
case R.id.bt_stop:
mThread.interrupt();
if(mThread.isInterrupted()){
binder.stops();
}
default:
break;
}
}
protected void onDestory(){
if(mThread!=null){
if(!mThread.isInterrupted()){
mThread.interrupt();
}
}
unbindService(conn);
super.onDestroy();
}
}

然后你要有一个service，叫MusicService，

package com.example.musicplayer;

import android.annotation.SuppressLint;
import android.app.Service;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnPreparedListener;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;

public class MusicSevice extends Service{
private static final String TAG="MusicService";
public MediaPlayer mediaPlayer;
class MyBinder extends Binder{
public void palys(String path){
play(path);
}
public void pauses(){
pause();
}
public void repalys(String path){
replay(path);
}
public void stops(){
stop();

}public int getCurrentPosition(){
return getCurrenProgress();
}
public int getMusicWidth(){
return getMusicLength();
}

}

public void onCreate(){
super.onCreate();
}

@SuppressLint("NewApi")
private void play(String path) {

try{
if(mediaPlayer == null){
Log.i(TAG,"开始播放音乐");
//创建一个MediaPlayer播放器
mediaPlayer=new MediaPlayer();
//指定参数为音频文件
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
//指定播放路径
mediaPlayer.setDataSource(path);
//准备播放
mediaPlayer.prepare();
mediaPlayer.setOnPreparedListener(new OnPreparedListener() {

@Override
public void onPrepared(MediaPlayer mp) {
mediaPlayer.start();
}
});
}else{
int position =getCurrenProgress();
mediaPlayer.seekTo(position);
try{
mediaPlayer.prepare();
}catch(Exception e){
e.printStackTrace();
}
mediaPlayer.start();
}
}catch(Exception e){
e.printStackTrace();
}
}

//暂停音乐
public void pause(){
if(mediaPlayer != null && mediaPlayer.isPlaying()){
Log.i(TAG, "暂停播放");
mediaPlayer.pause();
}else if(mediaPlayer !=null && (!mediaPlayer.isPlaying())){
mediaPlayer.start();
}
}

//重新播放
public void replay(String path){
if(mediaPlayer!=null){
Log.i(TAG, "重新开始播放");
mediaPlayer.seekTo(0);
try{
mediaPlayer.prepare();
}catch(Exception e){
e.printStackTrace();
}
mediaPlayer.start();
}
}

//停止播放
public void stop() {
if(mediaPlayer != null){
Log.i(TAG, "停止播放");
mediaPlayer.stop();
mediaPlayer.release();
mediaPlayer=null;
}else{
Toast.makeText(getApplicationContext(), "已停止", 0).show();
}

}

//获取文件资源长度
public int getMusicLength(){
if(mediaPlayer != null){
return mediaPlayer.getDuration();
}
return 0;
}
//获取当前进度
public int getCurrenProgress(){
try{
if(mediaPlayer !=null){
if(mediaPlayer.isPlaying()){
Log.i(TAG, "获取当前进度");
return mediaPlayer.getCurrentPosition();
}else if(!mediaPlayer.isPlaying()){
return mediaPlayer.getCurrentPosition();
}
}
}catch(Exception e){
e.printStackTrace();
}
return 0;
}

public void onDestroy(){
if(mediaPlayer !=null){
mediaPlayer.stop();
mediaPlayer.release();
mediaPlayer=null;
}
super.onDestroy();
}

@Override
public IBinder onBind(Intent arg0) {
return new MyBinder();
}

}

当然，你至少要有一个主样式文件，activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >

<EditText android:id="@+id/et_inputpath"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="data/data/com.example.musicplayer/1.mp3"/>

<SeekBar android:id="@+id/seekBar1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:layout_marginTop="20dp"/>
<LinearLayout android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_gravity="center_horizontal"
android:gravity="center">

<TextView android:id="@+id/bt_play"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="播放"
android:gravity="center"
android:drawableTop="@android:drawable/ic_media_play"
android:drawablePadding="3dp"/>

974e
<TextView android:id="@+id/bt_pause"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:drawableTop="@android:drawable/ic_media_pause"
android:drawablePadding="3dp"
android:gravity="center"
android:text="暂停"/>
<TextView android:id="@+id/bt_replay"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:drawableTop="@android:drawable/ic_media_play"
android:drawablePadding="3dp"
android:gravity="center"
android:text="重播"/>
<TextView android:id="@+id/bt_stop"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:drawableTop="@android:drawable/ic_media_pause"
android:drawablePadding="3dp"
android:gravity="center"
android:text="停止"/>

</LinearLayout>

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />

</LinearLayout>

最后别忘了注册你的activity和service，注册文件如下

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.musicplayer"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.musicplayer.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

<service android:name="com.example.musicplayer.MusicSevice"></service>
</application>

</manifest>

当然还有可能因为Android sdk版本的问题出现点小毛病，这里推荐使用Android 19

在向虚拟机导入音乐之前，你要先有一首不错的音乐，推荐一首请点击连接下载点击打开链接

使用eclipse-adt导入音乐文件

最终效果图

以上是本文的全部内容，谢谢观看