AndroidView v1.0 - Creating a Layout in Java Class

Android Tutorials - Herong's Tutorial Examples

∟AndroidView v1.0 - Creating a Layout in Java Class

This section provides a tutorial example on how to create a LinearLayout object with 2 Button objects in the activity Java class. Layout resource XML file is not used in this example.

To help playing with Android views, I want to start another new Android application called AndroidView using the "android create project" command:

C:\herong>\local\android-sdk-windows\tools\android create project \
   --package com.herongyang.view --activity AndroidView --target 2 \
   --path .\AndroidView

Created project directory: C:\herong\AndroidView
...
Added file C:\herong\AndroidView\build.xml

In the first version of AndroidView, I want to create a LinearLayout with two buttons:

/* AndroidView.java
 * Version 1.0 - Starting with 1 LinearLayout and 2 buttons
 * Copyright (c) 2015, HerongYang.com, All Rights Reserved.
 */
package com.herongyang.view;

import android.app.Activity;
import android.os.Bundle;
import android.widget.LinearLayout;
import android.widget.Button;
public class AndroidView extends Activity {
   @Override
   public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);

      // Create the layout
      LinearLayout l = new LinearLayout(this);

      // Create the left button
      Button bl = new Button(this);
      bl.setText("Yes");
      l.addView(bl);

      // Create the right button
      Button br = new Button(this);
      br.setText("No");
      l.addView(br);

      // Set the layout as the activity content
      setContentView(l);
   }
}

After building and installing the project, what I see when running AndroidView on the emulator is similar to this:

The output looks good to me. 1 LinearLayout holding 2 Buttons horizontally.

Notice that in this version of AndroidView, I created the LinearLayout object from the Java program without using the layout resource file. The next tutorial will show you how to create layout objects from the layout resource files.