brightness controll in android

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package com.exercise.AndroidScreenBrightness;

import com.exercise.AndroidScreenBrightness.R;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.TextView;

public class AndroidScreenBrightness extends Activity {
    /** Called when the activity is first created. */

float BackLightValue = 0.5f; //dummy default value

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        SeekBar BackLightControl = (SeekBar)findViewById(R.id.backlightcontrol);
        final TextView BackLightSetting = (TextView)findViewById(R.id.backlightsetting);
        Button UpdateSystemSetting = (Button)findViewById(R.id.updatesystemsetting);
       
        UpdateSystemSetting.setOnClickListener(new Button.OnClickListener(){

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub

int SysBackLightValue = (int)(BackLightValue * 255);

android.provider.Settings.System.putInt(getContentResolver(),
android.provider.Settings.System.SCREEN_BRIGHTNESS,
SysBackLightValue);

}});
       
        BackLightControl.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener(){

@Override
public void onProgressChanged(SeekBar arg0, int arg1, boolean arg2) {
// TODO Auto-generated method stub
BackLightValue = (float)arg1/100;
BackLightSetting.setText(String.valueOf(BackLightValue));

WindowManager.LayoutParams layoutParams = getWindow().getAttributes();
layoutParams.screenBrightness = BackLightValue;
getWindow().setAttributes(layoutParams);


}

@Override
public void onStartTrackingTouch(SeekBar arg0) {
// TODO Auto-generated method stub

}

@Override
public void onStopTrackingTouch(SeekBar arg0) {
// TODO Auto-generated method stub

}});
    }
}

main.xml
----------------------------

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Hello" />

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Set BackLight of the App" />

    <SeekBar
        android:id="@+id/backlightcontrol"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10px"
        android:max="100"
        android:progress="50" />

    <TextView
        android:id="@+id/backlightsetting"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="0.50" />

    <Button
        android:id="@+id/updatesystemsetting"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Update Settings.System.SCREEN_BRIGHTNESS" />

</LinearLayout>

mainifest.xml
---------------------------


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.exercise.AndroidScreenBrightness"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/ic_launcher" android:label="@string/app_name">
        <activity android:name=".AndroidScreenBrightness"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
    <uses-sdk android:minSdkVersion="4" />
<uses-permission android:name="android.permission.WRITE_SETTINGS"/>
</manifest>