Android學習筆記(六) 調整手機螢幕亮度Brightness seekbar實現

brightness（亮度）是window中的一個屬性

 

修改亮度需要取得window屬性

方法為：

 WindowManager.LayoutParams layoutParams = getWindow().getAttributes();<br /> layoutParams.screenBrightness = b;// b是亮度<br />getWindow().setAttributes(layoutParams);

 

b是一個浮點數 從0~1 ，表示亮度

 

例子（在真機上有效運行）

 

 

例子代碼：

 package young.ScreenBrightnessSolution;</p><p>import android.app.Activity;<br />import android.os.Bundle;<br />import android.view.WindowManager;<br />import android.widget.SeekBar;<br />import android.widget.TextView;<br />import android.widget.SeekBar.OnSeekBarChangeListener;</p><p>public class ScreenBrightnessSolution extends Activity {<br />private SeekBar ScreenBrightnessSeekBar;<br />private TextView tView ;<br /> /** Called when the activity is first created. */<br /> @Override<br /> public void onCreate(Bundle savedInstanceState) {<br /> super.onCreate(savedInstanceState);<br /> setContentView(R.layout.main);</p><p> //WindowManager windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);</p><p> //initView<br /> tView = (TextView)findViewById(R.id.text);<br /> ScreenBrightnessSeekBar = (SeekBar)findViewById(R.id.seekBrightness);<br /> //亮度是從0~1中的一個浮點數，由於getProess得到的是Int型，所以擴大10倍，賦值時除以10<br /> ScreenBrightnessSeekBar.setMax(10);<br /> ScreenBrightnessSeekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {</p><p>public void onStopTrackingTouch(SeekBar seekBar) {<br />// TODO Auto-generated method stub<br />setScreenBrightness((float)seekBar.getProgress()/10);<br />}</p><p>public void onStartTrackingTouch(SeekBar seekBar) {<br />// TODO Auto-generated method stub</p><p>}</p><p>public void onProgressChanged(SeekBar seekBar, int progress,<br />boolean fromUser) {<br />// TODO Auto-generated method stub</p><p>}<br />});<br /> }</p><p> private void setScreenBrightness(float b){<br /> //取得window屬性儲存在layoutParams中<br /> WindowManager.LayoutParams layoutParams = getWindow().getAttributes();<br /> layoutParams.screenBrightness = b;//b已經除以10<br /> getWindow().setAttributes(layoutParams);<br /> //顯示修改後的亮度<br /> layoutParams = getWindow().getAttributes();<br /> tView.setText(String.valueOf(layoutParams.screenBrightness));<br /> }<br />}