Android 利用TimerTask实现ImageView图片播放效果

末蓝、 2022-08-10 21:28 181阅读 0赞

在项目开发中，往往 要用到图片播放的效果，今天就用TimerTask和ImageView是实现简单的图片播放效果。

其中，TimerTask和Timer结合一起使用，主要是利用TimerTask的迭代延时等时间段处理事件的机制。

具体实例如下：

1.layout xml代码

2.MainActivity代码

<span style="font-family:Microsoft YaHei;font-size:18px;">package com.example.myimageplaydemo;
    
    import java.util.Timer;
    import java.util.TimerTask;
    
    import android.app.Activity;
    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.widget.Button;
    import android.widget.ImageView;
    
    public class MainActivity extends Activity implements OnClickListener {
    
    	private Button startBtn, stopBtn,restartBtn;
    	private ImageView imageIv;
    	private Timer timer;
    	private TimerTask timerTask;
    	private int count = 0;
    
    	private Handler handler = new Handler() {
    		@Override
    		public void handleMessage(Message msg) {
    			int myCount = Integer.valueOf(msg.obj.toString());
    
    			switch (msg.what) {
    			case 1:
    				setImageViewSrc(myCount);
    				break;
    			case 2:
    				stopTimer();
    				break;
    			case 3:
    				setImageViewSrc(myCount);
    				break;
    			}
    		}
    	};
    
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.activity_main);
    	}
    
    	@Override
    	public void onStart() {
    		super.onStart();
    
    		startBtn = (Button) this.findViewById(R.id.my_start_btn);
    		stopBtn = (Button) this.findViewById(R.id.my_stop_btn);
    		restartBtn = (Button) this.findViewById(R.id.my_restart_btn);
    		imageIv = (ImageView) this.findViewById(R.id.image_iv);
    
    		startBtn.setOnClickListener(this);
    		stopBtn.setOnClickListener(this);
    		restartBtn.setOnClickListener(this);
    	}
    
    	@Override
    	public void onStop() {
    		super.onStop();
    		stopTimer();
    	}
    
    	@Override
    	public void onClick(View v) {
    		// TODO Auto-generated method stub
    		switch (v.getId()) {
    		case R.id.my_start_btn:
    			if (timerTask == null) {
    				timer = new Timer();
    				//延迟一秒，迭代一秒设置图片
    				timerTask = new TimerTask() {
    
    					@Override
    					public void run() {
    						++count;
    						handler.sendMessage(handler.obtainMessage(1, count));
    					}
    				};
    				timer.schedule(timerTask, 1000, 1000);
    			} else {
    				handler.sendMessage(handler.obtainMessage(1, count));
    			}
    			break;
    		case R.id.my_stop_btn:
    			handler.sendMessage(handler.obtainMessage(2, count));
    			break;
    		case R.id.my_restart_btn:
    			if (timerTask == null) {
    				count = 0 ;
    				timer = new Timer();
    				timerTask = new TimerTask() {
    
    					@Override
    					public void run() {
    						count++;
    						handler.sendMessage(handler.obtainMessage(3, count));
    					}
    				};
    				timer.schedule(timerTask, 1000, 1000);
    			} else {
    				handler.sendMessage(handler.obtainMessage(3, 0));
    			}
    		}
    	}
    
    	/**
    	 * 根据count循环对ImageView设置图片
    	 * @param count
    	 */
    	private void setImageViewSrc(int count) {
    		int myCount = count % 7;
    		switch (myCount) {
    		case 0:
    			imageIv.setImageResource(R.drawable.onea);
    			break;
    		case 1:
    			imageIv.setImageResource(R.drawable.oneb);
    			break;
    		case 2:
    			imageIv.setImageResource(R.drawable.onec);
    			break;
    		case 3:
    			imageIv.setImageResource(R.drawable.oned);
    			break;
    		case 4:
    			imageIv.setImageResource(R.drawable.onee);
    			break;
    		case 5:
    			imageIv.setImageResource(R.drawable.onef);
    			break;
    		case 6:
    			imageIv.setImageResource(R.drawable.oneg);
    			break;
    		}
    	}
    	
    	/**
    	 * 销毁TimerTask和Timer
    	 */
    	private void stopTimer(){
    		if (timerTask != null) {
    			timerTask.cancel();
    			timerTask = null;
    		}
    		
    		if(timer != null){
    			timer.cancel();
    			timer = null;
    		}
    	}
    
    }
    </span>

其中

<span style="font-family:Microsoft YaHei;font-size:18px;"><span style="white-space:pre">			</span>if (timerTask == null) {
    				timer = new Timer();
    				//延迟一秒，迭代一秒设置图片
    				timerTask = new TimerTask() {
    
    					@Override
    					public void run() {
    						++count;
    						handler.sendMessage(handler.obtainMessage(1, count));
    					}
    				};
    				timer.schedule(timerTask, 1000, 1000);
    			} else {
    				handler.sendMessage(handler.obtainMessage(1, count));
    			}</span>

timerTask延迟一秒后再每秒设置不一样的图片，根据count进行循环的播放。

源码地址：[http://download.csdn.net/detail/a123demi/7736643][http_download.csdn.net_detail_a123demi_7736643]

[http_download.csdn.net_detail_a123demi_7736643]: http://download.csdn.net/detail/a123demi/7736643