Android 利用seekbar结合AudioManager调节系统音量

来源：互联网发布：2016下半年的网络综艺编辑：程序博客网时间：2024/04/30 14:15

花了一个上午的时间，查了许多资料和官方文档，总结了一下自己如何利用seekbar做出类似于按侧边控件弹出的音量控制。

我是利用按下喇叭按钮。然后，弹出一个Alertdialog，其中用到了setAdapter方法，见一个baseadapter加载进去。如下：

Builder builder=new AlertDialog.Builder(mcontext);

builder.setAdapter(adapter,new DialogInterface.OnClickListener() {

           @Override
           public void onClick(DialogInterface dialog, int which) {
               // TODO Auto-generated method stub

           }
       }).create().show();

不多说了，先贴上代码：

/**
   * 调整音量
   */
   private void adjustVoice() {
       // TODO Auto-generated method stub

       Builder builder=new AlertDialog.Builder(mcontext);
       BaseAdapter adapter=new BaseAdapter() {//
           class Holder{
               SeekBar seekbar;
           }

           @Override
           public View getView(int position, View convertView, ViewGroup parent) {
               // TODO Auto-generated method stub
               //final SeekBar replaceseekbar;
               LayoutInflater inflater=LayoutInflater.from(mcontext);
               Holder holder=null;
               if(convertView==null){
                   holder=new Holder();
                   convertView=inflater.inflate(R.layout.hsp_seekbar, null);
                   holder.seekbar=(SeekBar) convertView.findViewById(R.id.seekBar1);
                   convertView.setTag(holder);
               }
               else{
                   holder=(Holder)convertView.getTag();
               }

               final AudioManager audio=(AudioManager) mcontext.getSystemService(Context.AUDIO_SERVICE);
               int currentvolume=audio.getStreamVolume(AudioManager.STREAM_VOICE_CALL);//get the current volume
               int maxvolume=audio.getStreamMaxVolume(AudioManager.STREAM_VOICE_CALL);//get the max volume
               holder.seekbar.setProgress(currentvolume*100/maxvolume);//初始化音量
               Log.e("VOLUME", String.valueOf(currentvolume*100/maxvolume));//必须先*100，否则会为0
               holder.seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

                   @Override
                   public void onStopTrackingTouch(SeekBar seekBar) {
                       // TODO Auto-generated method stub
                   }

                   @Override
                   public void onStartTrackingTouch(SeekBar seekBar) {
                       // TODO Auto-generated method stub
                   }

                   @Override
                   public void onProgressChanged(SeekBar seekBar, int progress,
                           boolean fromUser) {
                       // TODO Auto-generated method stub
                       //调整音量的核心代码处
                       Log.e("VOLUME1", String.valueOf(progress));//测试
                       Log.e("VOLUME2", String.valueOf(progress/20));//测试
                       audio.setStreamVolume(AudioManager.STREAM_VOICE_CALL, progress/20, 0);
                       seekBar.setProgress(progress);
                   }
               });
               return convertView;
           }

           @Override
           public long getItemId(int position) {
               // TODO Auto-generated method stub
               return position;
           }

           @Override
           public Object getItem(int arg0) {
               // TODO Auto-generated method stub
               return 1;
           }

           @Override
           public int getCount() {
               // TODO Auto-generated method stub
               return 1;
           }
       };
       builder.setAdapter(adapter,new DialogInterface.OnClickListener() {

           @Override
           public void onClick(DialogInterface dialog, int which) {
               // TODO Auto-generated method stub

           }
       }).create().show();

}

在下面是我的seekbar的xml：（aa去掉下面）

R.layout.hsp_seekbar.xml

点击喇叭按钮就可以出现你要的效果啦！

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