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Bring Android application to forground



Intent launchApp = new Intent(context, Applications_MainActivity.class);
                            launchApp.setAction(Intent.ACTION_MAIN);
                            launchApp.addCategory(Intent.CATEGORY_LAUNCHER);
                            launchApp.setFlags(IConstants.NOTIFICATION_FLAG);//Use this Special Flag
                            context.getApplicationContext().startActivity(launchApp);


Update below value in your Constants File,
 
public static final int NOTIFICATION_FLAG = 0x10200000;
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