Android Alert Dialog

Android Development

 Android Alert Dialog :-

⇛ layout > .xml file :

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout

xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:gravity="center"

tools:context=".First">

<TextView

android:id="@+id/Idtextview1"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="If you press back button in your mobile then exit"

android:textAlignment="center"

android:textAllCaps="false"

android:textColor="#000"

android:textStyle="bold"/>

</LinearLayout>

⇛ java file :

package com.example.dell.alertdialog;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.widget.TabHost;

import android.widget.Toast;

public class First extends AppCompatActivity {

private long onbackPressed;

private Toast backToast;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_first);

}

//Override this method press Ctrl+O .

@Override

public void onBackPressed() {

// here 2000 means 2 second.

if (onbackPressed+2000 > System.currentTimeMillis()){

backToast.cancel();

super.onBackPressed();

return;

}else {

backToast = Toast.makeText(getApplication(),"Press back again to exit",Toast.LENGTH_SHORT);

backToast.show();

}

onbackPressed = System.currentTimeMillis();

}

}