android 两张图片切换

package com.example.testandroid; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ImageView; public class MainActivity extends Activity { // 声明Handler对象 private Handler handler; // 切换显示图片数组id的下标 private int index; // 切换是否进行 private boolean isRun = true; public static final int CHANGE_IMAGE = 1; // 切换的图片id数组 private int[] images = new int[] { R.drawable.drops_icon, R.drawable.drops_icon_selected}; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); handler = new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); if (msg.what == CHANGE_IMAGE) { ImageView imageView = (ImageView) findViewById(R.id.image); // 动态改变ImageView里面的图片 imageView.setImageResource(images[msg.getData().getInt( "index")]); } } }; // 获得按钮 Button btn1 = (Button) findViewById(R.id.btn1); Button btn2 = (Button) findViewById(R.id.btn2); btn2.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { isRun = false; } }); btn1.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { isRun = true; new Thread() { public void run() { for (index = 0; isRun; index++) { Message msg = new Message(); msg.what = CHANGE_IMAGE; // 创建Bundle对象，封装数据 Bundle bundle = new Bundle(); bundle.putInt("index", index); msg.setData(bundle); // 发送消息 handler.sendMessage(msg); // 循环切换 if (index >=1) { index = -1; } try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } } }.start(); } }); } }