Apps setting brightness through program

[anandkgowda]

Hi..
should any one knows how to control screen brightness through program for android device. ..i did one application but it works only for that window of a android device..i need control of brightness for the whole system not for single window..i posted my code here..please do the needful..please post full code..

package com.anand.brightness;
import android.app.Activity;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.View;
import android.view.WindowManager;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.SeekBar;

public class brightness_control extends Activity {
private static final String BRIGHTNESS_PREFERENCE_KEY = "brightness";
private View brightnessPanel;
private SeekBar brightnessControl;
private int brightness = 50;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
brightnessPanel = findViewById(R.id.panel);
brightnessControl = (SeekBar) findViewById(R.id.seek);
Button btn = (Button) findViewById(R.id.Button01);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showBrightnessPanel();
}
});
brightnessControl
.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
public void onProgressChanged(SeekBar seekBar,
int progress, boolean fromUser) {
setBrightness(progress);
}
public void onStartTrackingTouch(SeekBar seekBar) {
}
public void onStopTrackingTouch(SeekBar seekBar) {
hideBrightnessPanel();
}
});
}
private void showBrightnessPanel() {
Animation animation = AnimationUtils.loadAnimation(this,
android.R.anim.slide_in_left);
brightnessControl.setProgress(this.brightness);
brightnessPanel.setVisibility(View.VISIBLE);
brightnessPanel.startAnimation(animation);
}
private void setBrightness(int value) {
if (value < 10) {
value = 10;
} else if (value > 100) {
value = 100;
}
brightness = value;
WindowManager.LayoutParams lp = getWindow().getAttributes();
lp.screenBrightness = (float) value / 100;
lp.flags |= WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
getWindow().setAttributes(lp);
}
private void hideBrightnessPanel() {
Animation animation = AnimationUtils.loadAnimation(brightness_control.this,
android.R.anim.slide_out_right);
brightnessPanel.startAnimation(animation);
brightnessPanel.setVisibility(View.GONE);
PreferenceManager.getDefaultSharedPreferences(this).edit().putInt(
BRIGHTNESS_PREFERENCE_KEY, brightnessControl.getProgress())
.commit();

}
}


xml code:

<?​

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xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"​

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androidrientation="vertical" android:layout_width="fill_parent"​

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android:layout_height="fill_parent" android:background="#3399CC">​

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<Button android:text="Show Brightness Panel" android:id="@+id/Button01"​

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android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>​

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<LinearLayout android:id="@+id/panel" androidrientation="vertical"​

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android:layout_width="fill_parent" android:layout_height="wrap_content"​

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android:layout_alignParentBottom="true" androidaddingTop="10dip"​

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androidaddingBottom="30dip" androidaddingLeft="20dip"​

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androidaddingRight="20dip" android:gravity="center_horizontal"​

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android:visibility="gone">​

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<TextView android:text="Brightness Level"​

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android:layout_width="fill_parent" android:layout_height="wrap_content"​

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android:gravity="center" android:textAppearance="?android:attr/textAppearanceLarge" />​

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<SeekBar android:id="@+id/seek" android:layout_width="fill_parent"​

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android:layout_height="wrap_content" android:max="100"​

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androidrogress="100" />​

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</LinearLayout>​

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</​

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LinearLayout>​