Android中如何实现图像的闪动

最新推荐文章于 2024-06-20 16:05:28 发布

WindKun

最新推荐文章于 2024-06-20 16:05:28 发布

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分类专栏： android 文章标签： android thread class null

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本文详细介绍了在Android应用中通过线程和Handler实现ImageView控件的动态显示与隐藏的过程，包括创建线程、设置Handler消息处理逻辑及线程启动等关键步骤。

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main.xml 里有一个ImageView 控件，下面是代码：

package com.wind.activity;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.ImageView;

public class AndroidTestActivity extends Activity {
   /** Called when the activity is first created. */

   private ImageView mImageView;
   private boolean mFlag = true;
   private Thread mThread;
   private Handler mHandler;

   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);

       mImageView = (ImageView) findViewById(R.id.imageView1);

       mThread = new Thread(new ImageThread());

       mHandler = new Handler() {

           @Override
           public void handleMessage(Message msg) {
               // TODO Auto-generated method stub

               switch (msg.what) {
               case 1:
                   mFlag = mFlag ? false : true;

                   if (mFlag) {
                       mImageView.setVisibility(View.VISIBLE);
                   } else {
                       mImageView.setVisibility(View.INVISIBLE);
                   }
                   break;
               }

               super.handleMessage(msg);
           }

       };

       mThread.start();

   }

   class ImageThread implements Runnable {

       @Override
       public void run() {
           while (!mThread.isInterrupted()) {
               if (mHandler != null) {
                   Message message = new Message();
                   message.what = 1;
                   mHandler.sendMessage(message);
               }

               try {
                   Thread.sleep(800);
               } catch (InterruptedException e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
               }

           }
       }

   }

}