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

从来好事天生俭，自古瓜儿苦后甜。这篇文章主要讲述Android 自定义SeekBar动态改变硬件音量大小实现和音量键的同步相关的知识，希望能为你提供帮助。
1，上图：

文章图片

2，代码：
MainActivity.java

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(){ MyVolumeReceivermVolumeReceiver = 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) ; } } } }

main_activity.xml:

< ?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>

seekbar_progress_layer_list.xml

< ?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" /> < !--& lt; !& ndash; 选中状态& ndash; & gt; --> < item android:id= " @ android:id/progress" > < scale android:drawable= " @ mipmap/volumn_primary" android:scaleWidth= " 100%" /> < /item> < /layer-list>

不是你不会只是你不知道而已……..
整个代码实现很简单。笔者不在赘述。
注：打开demo，打开歌曲。滑动seekbar即可改音量大小。
maybe你更需要这个：
源码：
https://github.com/229457269/SeekBarChangedVoiceDemo
【Android 自定义SeekBar动态改变硬件音量大小实现和音量键的同步】参考： http://blog.csdn.net/lyjit/article/details/51538951