Android学习笔记(六) 调整手机屏幕亮度Brightness seekbar实现

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(); layoutParams.screenBrightness = b;// b是亮度 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;import android.app.Activity;import android.os.Bundle;import android.view.WindowManager;import android.widget.SeekBar;import android.widget.TextView;import android.widget.SeekBar.OnSeekBarChangeListener;public class ScreenBrightnessSolution extends Activity {private SeekBar ScreenBrightnessSeekBar;private TextView tView ; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //WindowManager windowManager = (WindowManager) getSystemService(WINDOW_SERVICE); //initView tView = (TextView)findViewById(R.id.text); ScreenBrightnessSeekBar = (SeekBar)findViewById(R.id.seekBrightness); //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 ScreenBrightnessSeekBar.setMax(10); ScreenBrightnessSeekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {public void onStopTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stubsetScreenBrightness((float)seekBar.getProgress()/10);}public void onStartTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stub}public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {// TODO Auto-generated method stub}}); } private void setScreenBrightness(float b){ //取得window属性保存在layoutParams中 WindowManager.LayoutParams layoutParams = getWindow().getAttributes(); layoutParams.screenBrightness = b;//b已经除以10 getWindow().setAttributes(layoutParams); //显示修改后的亮度 layoutParams = getWindow().getAttributes(); tView.setText(String.valueOf(layoutParams.screenBrightness)); }}