android media player seebar,Android利用SeekBar实现简单音乐播放器

一.Demo简介

利用AIDL为Activity绑定服务，利用Handler机制，发送消息更新SeekBar的UI，利用计时器定时更新SeekBar的进度。实现对音乐的开始播放，到暂停，继续，以及停止播放的功能。以及实现拖动进度条播放音乐的功能。

二.AIDL接口

利用AIDL机制提供给MainActivity访问MyMusicService的方法，实现播放暂停等功能。

三.主要类代码

1.MyMusicService

package my.com.mymusicp;

import android.app.Service;

import android.content.Intent;

import android.media.MediaPlayer;

import android.os.Bundle;

import android.os.IBinder;

import android.os.Message;

import android.os.RemoteException;

import android.support.annotation.Nullable;

import android.util.Log;

import java.io.IOException;

import java.util.Timer;

import java.util.TimerTask;

/**

* Created by c_ljf on 16-12-26.

*/

public class MyMusicService extends Service {

private String tag="MyMusicService";

private MediaPlayer mediaPlayer;

@Override

public void onCreate() {

super.onCreate();

mediaPlayer = new MediaPlayer();

}

@Nullable

@Override

public IBinder onBind(Intent intent) {

return new MyMusicBinder();

}

class MyMusicBinder extends IMyMusicService.Stub{

@Override

public void play() throws RemoteException {

playmusic();

}

@Override

public void pause() throws RemoteException {

pausemusic();

}

@Override

public void stop() throws RemoteException {

stopmusic();

}

@Override

public void continuePlay() throws RemoteException {

rePlayMusic();

}

@Override

public void seekPlayProgress(int position) throws RemoteException {

seekPlayPositiom(position);

}

}

//播放音乐

public void playmusic(){

mediaPlayer.reset();

String url = "sdcard/Music/Fade.mp3";

Log.i(tag,url);

try {

mediaPlayer.setDataSource(url);

mediaPlayer.prepare();

} catch (IOException e) {

e.printStackTrace();

}

// might take long! (for buffering, etc)

mediaPlayer.start();

//更新播放进度条

seekPlayProgress();

}

public void pausemusic(){

mediaPlayer.pause();

Log.i(tag,"暂停播放");

}

public void stopmusic(){

mediaPlayer.reset();

Log.i(tag,"停止播放");

mediaPlayer.stop();

}

@Override

public void onDestroy() {

super.onDestroy();

}

public void seekPlayPositiom(int positon){

Log.i(tag,"设置播放位置");

mediaPlayer.seekTo(positon);

}

public void seekPlayProgress(){

/*1.获取当前歌曲的总时长*/

final int duration=mediaPlayer.getDuration();

//计时器对象

final Timer timer=new Timer();

final TimerTask task=new TimerTask() {

@Override

public void run() {

//开启线程定时获取当前播放进度

int currentposition=mediaPlayer.getCurrentPosition();

//利用message给主线程发消息更新seekbar进度

Message ms=Message.obtain();

Bundle bundle=new Bundle();

bundle.putInt("duration",duration);

Log.i(tag,"歌曲总长度"+duration);

bundle.putInt("currentposition",currentposition);

Log.i(tag,"当前长度"+currentposition);

//设置发送的消息内容

ms.setData(bundle);

//发送消息

MainActivity.handler.sendMessage(ms);

}

};

timer.schedule(task,300,500);

//当播放结束时停止播放

mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {

@Override

public void onCompletion(MediaPlayer mp) {

Log.i(tag,"取消计时任务");

timer.cancel();

task.cancel();

}

});

}

public void rePlayMusic() {

Log.i(tag, "继续播放音乐");

mediaPlayer.start();

}

}

2.Mainactivity

package my.com.mymusicp;

import android.Manifest;

import android.app.Activity;

import android.content.ComponentName;

import android.content.Intent;

import android.content.ServiceConnection;

import android.content.pm.PackageManager;

import android.os.Bundle;

import android.os.Handler;

import android.os.IBinder;

import android.os.Message;

import android.os.RemoteException;

import android.support.v4.app.ActivityCompat;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.widget.Button;

import android.widget.SeekBar;

public class MainActivity extends AppCompatActivity {

private IMyMusicService iMyMusicService;

private static SeekBar seekBar;

private Button btpause_play;

private boolean b=true;//判断暂停和继续播放

public static Handler handler=new Handler(){

@Override

public void handleMessage(Message msg) {

//处理消息

Bundle bundle=msg.getData();

//获取歌曲长度和当前播放位置，并设置到进度条上

int duration=bundle.getInt("duration");

int currentposition=bundle.getInt("currentposition");

seekBar.setMax(duration);

seekBar.setProgress(currentposition);

}

};

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

verifyStoragePermissions(MainActivity.this);

//获取播放暂停按钮

btpause_play=(Button) findViewById(R.id.bt_pause);

Intent intent=new Intent(MainActivity.this,MyMusicService.class);

bindService(intent,new MyConn(),BIND_AUTO_CREATE);

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

seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

@Override

public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

}

@Override

public void onStartTrackingTouch(SeekBar seekBar) {

}

@Override

public void onStopTrackingTouch(SeekBar seekBar) {

try {

iMyMusicService.seekPlayProgress(seekBar.getProgress());

} catch (RemoteException e) {

e.printStackTrace();

}

}

});

}

//定义服务连接类

class MyConn implements ServiceConnection{

@Override

public void onServiceConnected(ComponentName name, IBinder service) {

iMyMusicService=IMyMusicService.Stub.asInterface(service);

}

@Override

public void onServiceDisconnected(ComponentName name) {

}

}

public void play(View v){

try {

iMyMusicService.play();

} catch (RemoteException e) {

e.printStackTrace();

}

}

public void pause(View v){

try {

if(b)

{

iMyMusicService.pause();

b=false;

btpause_play.setText("继续播放");

}

else{

b=true;

iMyMusicService.continuePlay();

btpause_play.setText("暂停播放");

}

} catch (RemoteException e) {

e.printStackTrace();

}

}

public void stop(View v){

try {

iMyMusicService.stop();

} catch (RemoteException e) {

e.printStackTrace();

}

}

// Storage Permissions

private static final int REQUEST_EXTERNAL_STORAGE = 1;

private static String[] PERMISSIONS_STORAGE = {

Manifest.permission.READ_EXTERNAL_STORAGE,

Manifest.permission.WRITE_EXTERNAL_STORAGE,

};

/**

* Checks if the app has permission to write to device storage

*

* If the app does not has permission then the user will be prompted to grant permissions

*

* @param activity

*/

public static void verifyStoragePermissions(Activity activity) {

// Check if we have write permission

int permission = ActivityCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE);

if (permission != PackageManager.PERMISSION_GRANTED) {

// We don't have permission so prompt the user

ActivityCompat.requestPermissions(

activity,

PERMISSIONS_STORAGE,

REQUEST_EXTERNAL_STORAGE

);

}

}

}

四.布局文件

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:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

android:paddingBottom="@dimen/activity_vertical_margin"

tools:context="my.com.mymusicp.MainActivity">

android:orientation="horizontal"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_alignParentTop="true"

android:layout_alignParentLeft="true"

android:layout_alignParentStart="true"

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

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="开始播放"

android:onClick="play"

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

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="暂停播放"

android:layout_weight="1"

android:onClick="pause"

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

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="停止播放"

android:onClick="stop"

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

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:id="@+id/seekBar"

android:layout_below="@+id/linearLayout"

android:layout_alignParentLeft="true"

android:layout_alignParentStart="true"/>

五.注册服务

package="my.com.mymusicp">

android:allowBackup="true"

android:icon="@mipmap/ic_launcher"

android:label="@string/app_name"

android:supportsRtl="true"

android:theme="@style/AppTheme">

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。