如何简单快速的在应用层调节亮度

private void setBrightness(int brightness) {
try {
Method getServiceMethod = Class.forName("android.os.ServiceManager").getMethod("getService", String.class);
IBinder binder = (IBinder) getServiceMethod.invoke(null, new Object[] { "power" });

Method asInterfaceMehod = Class.forName("android.os.IPowerManager$Stub").getMethod("asInterface", new Class[] {IBinder.class});
Object powerMan = asInterfaceMehod.invoke(null, binder);

Method setBacklightBrightness = powerMan.getClass().getMethod("setBacklightBrightness", new Class[]{int.class});

setBacklightBrightness.invoke(powerMan, new Object[]{brightness});

} catch (Exception doe) {
Log.i(TAG, "setBrightness error");
}
}