Displaying a Dialog Window Using an Activity

1. Using Eclipse create a new Android project and name it Dialog
2. Add the following statements in bold to the mainactivity.xml

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

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

    android:orientation="vertical"

    android:layout_height="fill_parent"

    android:layout_width="fill_parent"

    tools:context=".MainActivity" >

    <TextView

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="@string/hello_world" />

    <Button 

        android:id="@+id/btn_dialog"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:hint="@string/click"

        />

</LinearLayout>

3.Add the following statement in to the MainActivity.java file


package com.dialog;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {

CharSequence[] items={"Google","Apple","Htc"};
boolean[] itemsChecked=new boolean[items.length];
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn=(Button) findViewById(R.id.btn_dialog);
btn.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
showDialog(0);
}
});
}


@Deprecated
protected Dialog onCreateDialog(int id) {
// TODO Auto-generated method stub
switch (id) {
case 0:
return new AlertDialog.Builder(this).setIcon(R.drawable.ic_launcher).setTitle("My Dialog box....")
.setPositiveButton("OK",new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Toast.makeText(getBaseContext(), "OK Clicked...",Toast.LENGTH_SHORT).show();
}
}).setNegativeButton("Cancel",new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Toast.makeText(getBaseContext(), "Cancel Clicked...",Toast.LENGTH_SHORT).show();
}
}).setMultiChoiceItems(items, itemsChecked, new DialogInterface.OnMultiChoiceClickListener() {

@Override
public void onClick(DialogInterface dialog, int which, boolean isChecked) {
// TODO Auto-generated method stub
Toast.makeText(getBaseContext(), items[which]+(isChecked?"checked !":"unchecked !"),Toast.LENGTH_SHORT).show();
}
}).create();



}

return null;
}

}