Activity01.java

package com.yarin.android.Examples_04_16;

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.widget.Button;
import android.widget.ImageButton;
import android.widget.TextView;

public class Activity01 extends Activity {
	TextView m_TextView;
	// ����4��ImageButton����
	ImageButton m_ImageButton1;
	ImageButton m_ImageButton2;
	ImageButton m_ImageButton3;
	ImageButton m_ImageButton4;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		m_TextView = (TextView) findViewById(R.id.TextView01);
		// �ֱ�ȡ��4��ImageButton����
		m_ImageButton1 = (ImageButton) findViewById(R.id.ImageButton01);
		m_ImageButton2 = (ImageButton) findViewById(R.id.ImageButton02);
		m_ImageButton3 = (ImageButton) findViewById(R.id.ImageButton03);
		m_ImageButton4 = (ImageButton) findViewById(R.id.ImageButton04);

		// �ֱ�������ʹ�õ�ͼ��
		// m_ImageButton1����xml���������õģ��������ʱ��������
		m_ImageButton2.setImageDrawable(getResources().getDrawable(
				R.drawable.button2));
		m_ImageButton3.setImageDrawable(getResources().getDrawable(
				R.drawable.button3));
		m_ImageButton4.setImageDrawable(getResources().getDrawable(
				android.R.drawable.sym_call_incoming));

		// ���·ֱ�Ϊÿ����ť�����¼�����setOnClickListener
		m_ImageButton1.setOnClickListener(new Button.OnClickListener() {
			public void onClick(View v) {
				// �Ի���
				Dialog dialog = new AlertDialog.Builder(Activity01.this)
						.setTitle("��ʾ")
						.setMessage("����ImageButton1")
						.setPositiveButton("ȷ��",
								new DialogInterface.OnClickListener() {
									public void onClick(DialogInterface dialog,
											int whichButton) {

									}
								}).create();// ������ť

				dialog.show();
			}
		});
		m_ImageButton2.setOnClickListener(new Button.OnClickListener() {
			public void onClick(View v) {
				Dialog dialog = new AlertDialog.Builder(Activity01.this)
						.setTitle("��ʾ")
						.setMessage("����ImageButton2����Ҫʹ��ImageButton3��ͼ��")
						.setPositiveButton("ȷ��",
								new DialogInterface.OnClickListener() {
									public void onClick(DialogInterface dialog,
											int whichButton) {
										m_ImageButton2
												.setImageDrawable(getResources()
														.getDrawable(
																R.drawable.button3));
									}
								}).create();// ������ť

				dialog.show();
			}
		});
		m_ImageButton3.setOnClickListener(new Button.OnClickListener() {
			public void onClick(View v) {
				Dialog dialog = new AlertDialog.Builder(Activity01.this)
						.setTitle("��ʾ")
						.setMessage("����ImageButton3����Ҫʹ��ϵͳ��绰ͼ��")
						.setPositiveButton("ȷ��",
								new DialogInterface.OnClickListener() {
									public void onClick(DialogInterface dialog,
											int whichButton) {
										m_ImageButton3
												.setImageDrawable(getResources()
														.getDrawable(
																android.R.drawable.sym_action_call));
									}
								}).create();// ������ť

				dialog.show();
			}
		});
		m_ImageButton4.setOnClickListener(new Button.OnClickListener() {
			public void onClick(View v) {
				Dialog dialog = new AlertDialog.Builder(Activity01.this)
						.setTitle("��ʾ")
						.setMessage("����ʹ�õ�ϵͳͼ�꣡")
						.setPositiveButton("ȷ��",
								new DialogInterface.OnClickListener() {
									public void onClick(DialogInterface dialog,
											int whichButton) {

									}
								}).create();// ������ť

				dialog.show();
			}
		});
	}
}