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    Alert Example in android

    A dialog is a small window that prompts the user to make a decision or enter additional information. A dialog does not fill the screen and is normally used for modal events that require users to take an action before they can proceed.





    MainActivity.xml

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

        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        tools:context=".MainActivity">

        <Button
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="151dp"
            android:clickable="true"
            android:onClick="open"
            android:text="Alert" />

    </RelativeLayout>


    MainActivity.java

    import android.app.AlertDialog;
    import android.content.DialogInterface;
    import android.content.Intent;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.Menu;
    import android.view.MenuItem;
    import android.view.View;
    import android.widget.Button;
    import android.widget.Toast;

    public class MainActivity extends AppCompatActivity {

        @Override  
         protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
        }
        public void open(View view){
            AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
            alertDialogBuilder.setMessage("Are you sure,You wanted to make decision");

            alertDialogBuilder.setPositiveButton("yes", new DialogInterface.OnClickListener() {
                @Override           
       public void onClick(DialogInterface arg0, int arg1) {
                    Toast.makeText(MainActivity.this, "You clicked yes button", Toast.LENGTH_LONG).show();
                }
            });

            alertDialogBuilder.setNegativeButton("No", new DialogInterface.OnClickListener() {
                @Override            public void onClick(DialogInterface dialog, int which) {
                    finish();
                }
            });
            AlertDialog alertDialog = alertDialogBuilder.create();
            alertDialog.show();
        }
    }

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