Handler倒计时

最新推荐文章于 2024-10-12 11:18:04 发布

原创最新推荐文章于 2024-10-12 11:18:04 发布 · 137 阅读

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该博客介绍了如何在Android中实现倒计时以及动画效果。通过创建一个自定义Handler，实现了从3秒开始的倒计时，并在倒计时结束后跳转到新的Activity。同时，使用AlphaAnimation和TranslateAnimation组合成的AnimationSet为ImageView添加了动画效果。

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.AlphaAnimation;
import android.view.animation.AnimationSet;
import android.view.animation.TranslateAnimation;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;

public class MainActivity extends Activity implements OnClickListener {

   private TextView times;
   private Button buttons;
   private MyHandler handler = new MyHandler();
   int time = 3;
   private AnimationSet animationSet;
   private RelativeLayout image;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       // 找控件
       initView();
       // 倒计时
       startTime();
       // 动画
       startAnimation();
   }

   private void startAnimation() {
       animationSet = new AnimationSet(false);
       AlphaAnimation aa = new AlphaAnimation(0, 100);
       TranslateAnimation ta = new TranslateAnimation(0, 360, 0, 0);
       animationSet.addAnimation(aa);
       animationSet.setDuration(3000);
       animationSet.setFillAfter(true);
       image.startAnimation(animationSet);
   }

   private void startTime() {
       // TODO Auto-generated method stub
       // 继续发送消息
       handler.sendEmptyMessageDelayed(0, 1000);
   }

   private void initView() {
       image = (RelativeLayout) findViewById(R.id.image);
       times = (TextView) findViewById(R.id.times);
       buttons = (Button) findViewById(R.id.buttons);
       // 点击跳转
       buttons.setOnClickListener(this);
   }

   @Override
   public void onClick(View v) {
       // TODO Auto-generated method stub
       handler.removeCallbacksAndMessages(null);
       startActivity(new Intent(MainActivity.this, TwoActivity.class));
       finish();
   }

   class MyHandler extends Handler {
       @Override
       public void handleMessage(Message msg) {
           // TODO Auto-generated method stub
           super.handleMessage(msg);
           time--;
           times.setText(time + "S");
           if (time == 0) {
               // 停止发送消息
               handler.removeCallbacksAndMessages(null);
               // 跳转页面
               startActivity(new Intent(MainActivity.this, TwoActivity.class));
               finish();
           } else {
               // 继续发送消息
               handler.sendEmptyMessageDelayed(0, 1000);
           }
       }
   }
}