Android 自定义SeekBar动态改变硬件音量大小实现和音量键的同步(推荐)

package com.hero.zhaoq.seekbarchangeddemo;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.database.ContentObserver;import android.media.AudioManager;import android.os.Handler;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.widget.SeekBar;/** * Android实现 SeekBar更新音量 并实现 和硬件同步 */public class MainActivity extends AppCompatActivity { private SeekBar seekbar_video; private ContentObserver mVoiceObserver; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);//获取媒体系统服务  seekbar_video= (SeekBar) findViewById(R.id.seekbar_video);//注册ID  seekbar_video.setMax(15);//设置最大音量  seekbar_video.setProgress(audioManager.getStreamVolume(AudioManager.STREAM_MUSIC));// 当前的媒体音量  myRegisterReceiver();//注册同步更新的广播  Log.i("lyj_ring", "mVoiceSeekBar max voluem = "+audioManager.getStreamMaxVolume(AudioManager.STREAM_SYSTEM));  seekbar_video.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {   public void onStopTrackingTouch(SeekBar arg0) {   }   public void onStartTrackingTouch(SeekBar arg0) {   }   public void onProgressChanged(SeekBar arg0, int arg1, boolean arg2) {    AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);    Log.v("lyj_ring", "mVoiceSeekBar max progress = "+arg1);    //系统音量和媒体音量同时更新    audioManager.setStreamVolume(AudioManager.STREAM_SYSTEM, arg1, 0);    audioManager.setStreamVolume(3, arg1, 0);// 3 代表 AudioManager.STREAM_MUSIC   }  });  mVoiceObserver = new ContentObserver(new Handler()) {   @Override   public void onChange(boolean selfChange) {    super.onChange(selfChange);    AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);    seekbar_video.setProgress(audioManager.getStreamVolume(AudioManager.STREAM_SYSTEM));    //或者你也可以用媒体音量来监听改变，效果都是一样的。    //mVoiceSeekBar.setProgress(audioManager.getStreamVolume(AudioManager.STREAM_MUSIC));   }  }; } private void myRegisterReceiver(){  MyVolumeReceiver mVolumeReceiver = new MyVolumeReceiver() ;  IntentFilter filter = new IntentFilter() ;  filter.addAction("android.media.VOLUME_CHANGED_ACTION") ;  registerReceiver(mVolumeReceiver, filter) ; } /**  * 处理音量变化时的界面显示  * @author long  */ private class MyVolumeReceiver extends BroadcastReceiver {  @Override  public void onReceive(Context context, Intent intent) {   //如果音量发生变化则更改seekbar的位置   if(intent.getAction().equals("android.media.VOLUME_CHANGED_ACTION")){    AudioManager mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);    int currVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC) ;// 当前的媒体音量    seekbar_video.setProgress(currVolume) ;   }  } }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/ringtone_seekbar_parent" android:layout_width="match_parent" android:layout_height="160px" android:layout_marginTop="0dip" android:layout_weight="1" android:gravity="center_vertical" android:orientation="horizontal" > <SeekBar  android:id="@+id/seekbar_video"  android:layout_width="match_parent"  android:layout_height="25dp"  android:max="0"  android:progress="0"  android:progressDrawable="@drawable/seekbar_progress_layer_list"  android:thumb="@mipmap/play_seekbar_icon"  android:layout_weight="18"/></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><layer-list xmlns:android="http://schemas.android.com/apk/res/android"> <!--未选中 状态--> <item android:id="@android:id/background"  android:drawable="@mipmap/volumn_bg" /> <!--<!–选中状态–>--> <item android:id="@android:id/progress">  <scale android:drawable="@mipmap/volumn_primary" android:scaleWidth="100%" /> </item></layer-list>