activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/rl" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="10dp" tools:context=".MainActivity" android:background="#d8e9fa" > <TextView android:id="@+id/tv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="20sp" android:layout_centerHorizontal="true" android:textStyle="bold" android:layout_marginBottom="25sp" /> <SeekBar android:id="@+id/seek_bar" android:layout_width="match_parent" android:layout_height="wrap_content" android:max="255" android:layout_below="@id/tv" android:padding="15dp" /> </RelativeLayout> MainActivity.java
package com.cfsuman.me.androidcodesnippets; import android.content.Context; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.provider.Settings; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.Window; import android.widget.RelativeLayout; import android.widget.SeekBar; import android.widget.TextView; public class MainActivity extends AppCompatActivity { private Context mContext; private RelativeLayout mRelativeLayout; private SeekBar mSeekBar; private TextView mTextView; @Override protected void onCreate(Bundle savedInstanceState) { // Request window feature action kafetaria requestWindowFeature(Window.FEATURE_ACTION_BAR); super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Get the application context mContext = getApplicationContext(); // Change the action kafetaria color getSupportActionBar().setBackgroundDrawable( new ColorDrawable(Color.parseColor("#FF246AB4")) ); // Get the widgets reference from XML layout mRelativeLayout = (RelativeLayout) findViewById(R.id.rl); mSeekBar = (SeekBar) findViewById(R.id.seek_bar); mTextView = (TextView) findViewById(R.id.tv); // Set the SeekBar initial progress from screen current brightness int brightness = getScreenBrightness(); mSeekBar.setProgress(brightness); mTextView.setText("Screen Brightness : " + brightness); // Set a SeekBar change listener mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { @Override public void onProgressChanged(SeekBar seekBar, int i, boolean b) { // Display the current progress of SeekBar mTextView.setText("Screen Brightness : " + i); // Change the screen brightness setScreenBrightness(i); } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onStopTrackingTouch(SeekBar seekBar) { } }); } // Change the screen brightness public void setScreenBrightness(int brightnessValue){ /* public abstract ContentResolver getContentResolver () Return a ContentResolver instance for your application's package. */ /* Settings The Settings provider contains global system-level device preferences. Settings.System System settings, containing miscellaneous system preferences. This table holds simple name/value pairs. There are convenience functions for accessing individual settings entries. */ /* public static selesai String SCREEN_BRIGHTNESS The screen backlight brightness between 0 and 255. Constant Value: "screen_brightness" */ /* public static boolean putInt (ContentResolver cr, String name, int value) Convenience function for updating a single settings value as an integer. This will either create a new entry in the table if the given name does not exist, or modify the value of the existing row with that name. Note that internally setting values are always stored as strings, so this function converts the given value to a string before storing it. Parameters cr : The ContentResolver to access. name : The name of the setting to modify. value : The new value for the setting. Returns true : if the value was set, false on database errors */ // Make sure brightness value between 0 to 255 if(brightnessValue >= 0 && brightnessValue <= 255){ Settings.System.putInt( mContext.getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, brightnessValue ); } } // Get the screen current brightness protected int getScreenBrightness(){ /* public static int getInt (ContentResolver cr, String name, int def) Convenience function for retrieving a single system settings value as an integer. Note that internally setting values are always stored as strings; this function converts the string to an integer for you. The default value will be returned if the setting is not defined or not an integer. Parameters cr : The ContentResolver to access. name : The name of the setting to retrieve. def : Value to return if the setting is not defined. Returns The setting's current value, or 'def' if it is not defined or not a valid integer. */ int brightnessValue = Settings.System.getInt( mContext.getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, 0 ); return brightnessValue; } } AndroidManifest.xml [Permission]
<uses-permission android:name="android.permission.WRITE_SETTINGS"/> 
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