ViewAnimationActivity.java

package com.google.mcommerce.sample.android.chapter13.view;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;

import com.google.mcommerce.sample.android.R;

public class ViewAnimationActivity extends Activity {

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.c13_view_layout);
		setupListView();
		this.setupButton();
	}

	private void setupListView() {
		String[] listItems = new String[] { "Item 1", "Item 2", "Item 3",
				"Item 4", "Item 5", "Item 6", };

		ArrayAdapter<String> listItemAdapter = new ArrayAdapter<String>(this,
				android.R.layout.simple_list_item_1, listItems);
		ListView lv = (ListView) this.findViewById(R.id.list_view_id);
		lv.setAdapter(listItemAdapter);
	}

	private void setupButton() {
		Button b = (Button) this.findViewById(R.id.btn_animate);
		b.setOnClickListener(new Button.OnClickListener() {
			public void onClick(View v) {
				animateListView();
			}
		});
	}

	private void animateListView() {
		Log.d("h", "animate list view");
		ListView lv = (ListView) this.findViewById(R.id.list_view_id);
		float cx = (float) (lv.getWidth() / 2.0);
		float cy = (float) (lv.getHeight() / 2.0);
		lv.startAnimation(new ViewAnimation2());
	}
}