Displaying a dialog using an activity in android tutorial.
There are times where you need to display a dialog window to get a confirmation from the user. In
this case, you can override the onCreateDialog()protected method defined in the base Activity
class to display a dialog window. The following Try It Out shows you how.
Now, create a new android project.
<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="com.example.demoshowdialog.MainActivity"
>
<Button
android:id="@+id/btnShow_Dialog"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Show Dialog" />
</RelativeLayout>
Next, the proccess code in MainActivity.java file:
package
com.example.demoshowdialog;
import android.app.Activity;
import
android.app.AlertDialog;
import android.app.Dialog;
import
android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import
android.view.View.OnClickListener;
import
android.widget.Button;
public class MainActivity extends Activity {
private Button btnShow_Dialog;
CharSequence[] items = { "Asus", "Acer", "Dell", "Vaio" };
boolean[] bool = new boolean[items.length];
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnShow_Dialog = (Button)
findViewById(R.id.btnShow_Dialog);
btnShow_Dialog.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
showDialog(0);
}
});
}
@Override
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("Show Dialog
Demo")
.setPositiveButton("Yes",new
DialogInterface.OnClickListener() {
@Override
public void
onClick(DialogInterface dialog,int which) {
// TODO Auto-generated
method stub
}
})
.setNegativeButton("No",new
DialogInterface.OnClickListener() {
@Override
public void
onClick(DialogInterface dialog, int which) {
// TODO Auto-generated
method stub
}
})
.setMultiChoiceItems(items, bool,new
DialogInterface.OnMultiChoiceClickListener() {
@Override
public void
onClick(DialogInterface dialog,int which, boolean isChecked) {
// TODO Auto-generated
method stub
}
}).create();
}
return null;
}
}
Explain:
To display a dialog, you first override the onCreateDialog() method in the Activity class
@Override
protected
Dialog onCreateDialog(int id) {
...
}
This method is called when you call the showDialog() method
btnShow_Dialog = (Button)
findViewById(R.id.btnShow_Dialog);
btnShow_Dialog.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
showDialog(0);
}
});
The onCreateDialog() method is a callback for creating dialogs that are managed by the activity. When you call the showDialog() method, this callback will be invoked. The showDialog() method accepts an integer argument identifying a particular dialog to display.
Download source code: updating...
