LockScreenButton.java

package com.android.settings.widget.buttons;

import android.app.Activity;
import android.app.KeyguardManager;
import android.app.KeyguardManager.KeyguardLock;
import android.content.Context;
import android.content.SharedPreferences;
import android.view.Gravity;
import android.widget.Toast;

import com.android.settings.R;
import com.android.settings.widget.SettingsAppWidgetProvider;
import com.android.settings.widget.WidgetSettings;


public class LockScreenButton extends WidgetButton {

	static Boolean lockScreen = null;

	public static final String LOCK_SCREEN="lockScreen";
	static LockScreenButton ownButton=null;
	KeyguardLock lock;

	private KeyguardLock getLock(Context context) {
		if (lock==null) {
			KeyguardManager keyguardManager = (KeyguardManager)context.getSystemService(Activity.KEYGUARD_SERVICE);
			lock = keyguardManager.newKeyguardLock(Context.KEYGUARD_SERVICE);
		}	
		return lock;
	}

	public void updateState(Context context,
			SharedPreferences globalPreferences, int[] appWidgetIds) {
		getState(context);
		if (lockScreen==null) {
			currentIcon=R.drawable.ic_appwidget_settings_lock_screen_off;
			currentState=SettingsAppWidgetProvider.STATE_INTERMEDIATE;
		} else if (lockScreen) {
			currentIcon=R.drawable.ic_appwidget_settings_lock_screen_on;
			currentState=SettingsAppWidgetProvider.STATE_ENABLED;
		} else {
			currentIcon=R.drawable.ic_appwidget_settings_lock_screen_off;
			currentState=SettingsAppWidgetProvider.STATE_DISABLED;
		}				
	}

	/**
	 * Toggles the state of GPS.
	 * 
	 * @param context
	 */
	public void toggleState(Context context) {
		getState(context);
		if(lockScreen==null) {
			Toast msg = Toast.makeText(context, "Not yet initialized", Toast.LENGTH_LONG);
			msg.setGravity(Gravity.CENTER, msg.getXOffset() / 2, msg.getYOffset() / 2);
			msg.show();			
		} else {
			getLock(context);
			if (lockScreen && lock!=null){
				lock.disableKeyguard();
				lockScreen=false;
//				writeState(context);
			} else if (lock!=null){
				lock.reenableKeyguard();			
				lockScreen=true;
//				writeState(context);
			}		
		}
	}	

	/**
	 * Gets the state of GPS location.
	 * 
	 * @param context
	 * @return true if enabled.
	 */
	private static boolean getState(Context context) {
		if (lockScreen==null) {
		/*
			SharedPreferences preferencesGeneral = context.getSharedPreferences(WidgetSettings.WIDGET_PREF_MAIN,Context.MODE_PRIVATE);
			if (preferencesGeneral.getInt(WidgetSettings.SAVED, SettingsAppWidgetProvider.WIDGET_NOT_CONFIGURED)==SettingsAppWidgetProvider.WIDGET_PRESENT ) {
				lockScreen=preferencesGeneral.getBoolean(LOCK_SCREEN, true);
			} else {
				return false;
			}
		*/
			lockScreen=true;
		}
		return lockScreen;
	}


	public static LockScreenButton getInstance() {
		if (ownButton==null)
			ownButton = new LockScreenButton();

		return ownButton;
	}

	@Override
	void initButton() {
		buttonID=WidgetButton.BUTTON_LOCK_SCREEN;
		preferenceName=WidgetSettings.TOGGLE_LOCK_SCREEN;
	}

}