以下是一個使用SeekBar來調節系統音量的實例：
1、XML：
?? <SeekBar
??android:id="@+id/sound"
??android:layout_width="150px"
??android:layout_height="10px"
??android:max="100"? //設置拖動條最大值
??android:progress="10"?? //設置拖動條當前值
??android:progressDrawable="@layout/seekbar_style"? //拖動條樣式
??android:thumb="@layout/thumb" />??//滑塊樣式
?

2、seekbar_style.xml:
?<?xml version="1.0" encoding="UTF-8"?>??
?<layer-list xmlns:android="http://schemas.android.com/apk/res/android">??
?
??? <item android:id="@android:id/background">??
??????? <shape>??
??????????? <corners android:radius="10dip" />??
??????????? <gradient android:startColor="#ffffffff"?
??????????????? android:centerColor="#ff000000" android:endColor="#ff808A87"?
??????????????? android:centerY="1" android:angle="270" />??
??????? </shape>??
??? </item>??
?
??? <item android:id="@android:id/progress">??
??????? <clip>??
??????????? <shape>??
??????????????? <corners android:radius="10dip" />??
??????????????? <gradient android:startColor="#ffffffff"?
??????????????????? android:centerColor="#ffFFFF00" android:endColor="#ffAABD00"?
??????????????????? android:centerY="1" android:angle="270" />??
??????????? </shape>??
??????? </clip>??
??? </item>??
?</layer-list>???

3、thumb.xml:
?<?xml version="1.0" encoding="UTF-8"?>????
?<selector xmlns:android="http://schemas.android.com/apk/res/android">??????????
??<!-- 按下狀態 -->???
??<item??????
???android:state_pressed="true"???
???android:drawable="@drawable/thumb_normal"?????
???/>?????
??<!-- 普通無焦點狀態 -->???
??<item??????
???android:state_focused="false"??????
???android:state_pressed="false"????
???android:drawable="@drawable/thumb_normal"?
??/>??
?</selector>???

4、bacon_seekbar.xml:
?<layer-list
?? xmlns:android="http://schemas.android.com/apk/res/android">
?? <item
??android:id="@+android:id/background"
??android:drawable="@drawable/thumb_normal" />
?? <item
??android:id="@+android:id/SecondaryProgress"
??android:drawable="@drawable/thumb_normal" />
?? <item
??android:id="@+android:id/progress"
??android:drawable="@drawable/thumb_normal" />
?</layer-list>

5、JAVA代碼：
public class PianoActivity extends Activity {
??? /** Called when the activity is first created. */
? private ImageButton imageButton_white1;
?private MediaPlayer mediaPlayer01;
?public? AudioManager audiomanage;
?private TextView mVolume ;? //顯示當前音量
? public? SeekBar soundBar;
? private int maxVolume, currentVolume;?

?

?private int volume=0;? //初始化聲音

??? @Override
??? public void onCreate(Bundle savedInstanceState) {
??????? super.onCreate(savedInstanceState);
??????? setContentView(R.layout.main);
??????? mediaPlayer01 = new MediaPlayer();??????
??????

??????? imageButton_white1=(ImageButton)findViewById(R.id.white1);
??????? final SeekBar soundBar=(SeekBar)findViewById(R.id.sound);? //音量設置
??????? mVolume = (TextView)findViewById(R.id.mVolume);?
??????? audiomanage = (AudioManager)getSystemService(Context.AUDIO_SERVICE);?

??????? maxVolume = audiomanage.getStreamMaxVolume(AudioManager.STREAM_MUSIC);? //獲取系統最大音量
??????? soundBar.setMax(maxVolume);?? //拖動條最高值與系統最大聲匹配
??????? currentVolume = audiomanage.getStreamVolume(AudioManager.STREAM_MUSIC);? //獲取當前值
??????? soundBar.setProgress(currentVolume);?
??????? mVolume.setText(currentVolume*100/maxVolume + " %");?
?
??????? soundBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener(){調音監聽器
???????　　?public void onProgressChanged(SeekBar arg0,int progress,boolean fromUser){
????????????　　??audiomanage.setStreamVolume(AudioManager.STREAM_MUSIC, progress, 0);??
???????????　　???currentVolume = audiomanage.getStreamVolume(AudioManager.STREAM_MUSIC);? //獲取當前值
????????????　　? soundBar.setProgress(currentVolume);??
??????????　　??? mVolume.setText(currentVolume*100/maxVolume + " %");??
???????　　?}
???????　　??
???　　 　@Override
??　　　　public void onStartTrackingTouch(SeekBar seekBar) {
???　　??　　???// TODO Auto-generated method stub
????　　???}
???　　　 @Override
??　　　　public void onStopTrackingTouch(SeekBar seekBar) {
??　　　　??? ?// TODO Auto-generated method stub????

??　　　　?}
????? });

?

轉載于:https://www.cnblogs.com/zhangping/p/3514146.html

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