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android 调节屏幕亮度

public void setBrightness(int level) { 
ContentResolver cr = getContentResolver(); 
Settings.System.putInt(cr, "screen_brightness", level); 
Window window = getWindow(); 
LayoutParams attributes = window.getAttributes(); 
float flevel = level; 
attributes.screenBrightness = flevel / 255; 
getWindow().setAttributes(attributes); 

android 调节屏幕亮度