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.

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 set 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();
    }
}