Best 2 Travel Wallpaper

This example demonstrate how to create layout and view at run time using Java code, instead of XML code. We can assign IDs for the layouts/views by calling setId() mdthod.

Programmatically create layout and view, with ID assigned by setId().

In order to call setId() with named id, create /res/values/ids.xml to define out ID resources.

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <item type="id" name="layout_id"/>
    <item type="id" name="image_id" />
</resources>

Main code.

package com.exercise.AndroidSetId;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;

public class AndroidSetIdActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        LinearLayout layout = new LinearLayout(AndroidSetIdActivity.this);
        layout.setId(R.id.layout_id);
        LayoutParams layoutParams 
         = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
        layout.setLayoutParams(layoutParams);
        layout.setOrientation(LinearLayout.VERTICAL);
        
        ImageView imageView = new ImageView(AndroidSetIdActivity.this);
        imageView.setId(R.id.image_id);
        imageView.setImageResource(R.drawable.ic_launcher);
        LayoutParams imageViewLayoutParams 
         = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        imageView.setLayoutParams(imageViewLayoutParams);
        
        layout.addView(imageView);
        
        setContentView(layout);
        
        layout.setOnClickListener(viewOnClickListener);
        imageView.setOnClickListener(viewOnClickListener);
    }
    
    OnClickListener viewOnClickListener
    = new OnClickListener(){

  @Override
  public void onClick(View v) {
   
   int myId = v.getId();
   
   Toast.makeText(AndroidSetIdActivity.this, 
     "ID: " + String.valueOf(myId) + " clicked", 
     Toast.LENGTH_LONG).show();
  }};
}