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How to create Dialog on startup in android?
public class PopupActivity extends Activity implements OnClickListener {


LinearLayout ll = new LinearLayout(this);
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(ll);

}

  protected void onStart()
 {
super.onStart();
final PopupWindow pw;
Button button = new Button(this);
button.setText("Hello");
pw = new PopupWindow(button, 245, 284, true);
button.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View view) {
        pw.dismiss();
    }
});

pw.showAsDropDown(ll, 10, -50);
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="fill_parent"
    android:layout_width="fill_parent"
    android:orientation="vertical"
    android:id="@+id/layoutTemp">

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:padding="10dip"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="#FFFFFF">

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dip"
        android:text="Test Pop-Up" />

</LinearLayout>

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

    new Handler().postDelayed(new Runnable() {
        public void run() {
            showPopup();
        }
    }, 100);
}


public void showPopup(){
    LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    PopupWindow pw = new PopupWindow(inflater.inflate(R.layout.popup_layout, null, false), 100, 100, true);
    pw.showAtLocation(findViewById(R.id.layoutTemp), Gravity.CENTER, 0, 0);
}