学步园

brightness（亮度）是window中的一个属性

修改亮度需要取得window属性

方法为：

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

b是一个浮点数 从0~1 ，表示亮度

例子效果图（在真机上有效运行）

例子代码：

 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 /> //亮度是从0~1中的一个浮点数，由于getProess得到的是Int型，所以扩大10倍，赋值时除以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属性保存在layoutParams中<br /> WindowManager.LayoutParams layoutParams = getWindow().getAttributes();<br /> layoutParams.screenBrightness = b;//b已经除以10<br /> getWindow().setAttributes(layoutParams);<br /> //显示修改后的亮度<br /> layoutParams = getWindow().getAttributes();<br /> tView.setText(String.valueOf(layoutParams.screenBrightness));<br /> }<br /> }