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Android AlertDialog Programatically Example



In Android Programming we have AlertDialogs the way we have HTML. We can have OK and CANCEL buttons with and Title and text messages/info.

Alert Dialog Android Example


1. Create an object of AlertDialog.Builder from android.app.AlertDialog package.

AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);


2. Set the Title for the Alert Dialog using setTitle() method.

alertDialog.setTitle("Android Alert Message");


3. Set the Message for the Alert Dialog using setTitle() method.

alertDialog.setMessage("Put your description text here!");


4. Now if you want to add some other views you can add them to a custom Layout without the Alert Dialog. So lets create a LinearLayout and sets its orientation as Vertical.

LinearLayout diagLayout = new LinearLayout(this);
diagLayout.setOrientation(LinearLayout.VERTICAL);


5. Now lets create a TextView and set its text using setText() and add attributes like padding, gravity and setTextSIze using setPadding(), setGravity() and setTextView() respectively.

TextView text = new TextView(this); text.setText("Another text view");
text.setPadding(10, 10, 10, 10);
text.setGravity(Gravity.CENTER);
text.setTextSize(20);


6. Set the Title for the Alert Dialog using setTitle() method.

diagLayout.addView(text);
alertDialog.setView(diagLayout);


7. Add two buttons Positive and Negative using setNegativeButton() and SetPositiveButton(). Also add listers OnClickListener to both the buttons and display a Toast message!.

alertDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {

  Toast.makeText(getApplicationContext(), "OK Button pressed!",
  Toast.LENGTH_LONG).show();
  dialog.dismiss();
}
});

alertDialog.setNegativeButton("CANCEL",
  new DialogInterface.OnClickListener() {
  public void onClick(DialogInterface dialog, int id) {
  Toast.makeText(getApplicationContext(),
  "CANCEL button pressed!!", Toast.LENGTH_LONG).show();
  dialog.dismiss();
}
});


8. Finally we display the Alert Dialog message using show() method.

alertDialog.show();


Complete Code :





package com.example.drawing;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Gravity;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

public class AlertDialogExample extends ActionBarActivity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_sample);

		AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);

		alertDialog.setTitle("Android Alert Message");

		alertDialog.setMessage("Put your description text here!");

		LinearLayout diagLayout = new LinearLayout(this);

		diagLayout.setOrientation(LinearLayout.VERTICAL);
		final TextView text = new TextView(this);
		text.setText("Another text view");
		text.setPadding(10, 10, 10, 10);
		text.setGravity(Gravity.CENTER);
		text.setTextSize(20);

		diagLayout.addView(text);

		alertDialog.setView(diagLayout);

		alertDialog.setPositiveButton("OK",
				new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog, int id) {

						Toast.makeText(getApplicationContext(),
								"OK Button pressed!", Toast.LENGTH_LONG).show();
						dialog.dismiss();
					}
				});

		alertDialog.setNegativeButton("CANCEL",
				new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog, int id) {
						Toast.makeText(getApplicationContext(),
								"CANCEL button pressed!!", Toast.LENGTH_LONG)
								.show();
						dialog.dismiss();
					}
				});

		alertDialog.show();

	}

}











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