Android 实现按钮从两边移到中间动画效果

最新推荐文章于 2025-06-28 01:02:27 发布

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#android #button #layout #class #thread

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这篇博客介绍了如何在Android中实现一个动画效果，让按钮从屏幕的两边逐渐移动到中间。通过布局和线程控制，创建出平滑的动画过渡。

Android 实现按钮从两边移到中间动画效果

http://blog.youkuaiyun.com/aminfo/article/details/7589149

package org.shuxiang.test;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;

import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Gravity;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;

public class MainActivity extends Activity
{
	private DisplayMetrics dm;
	private LinearLayout layout, layoutLeft, layoutCenter, layoutRight;
	private static Handler messageHandler;
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)  
    {
        super.onCreate(savedInstanceState);
        
        dm = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        
        layout = new LinearLayout(this);
        layout.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
        layout.setOrientation(0); //水平
        layout.setGravity(Gravity.CENTER);
        
        layoutLeft = new LinearLayout(this);
        layoutLeft.setLayoutParams(new LayoutParams(0, LayoutParams.WRAP_CONTENT));
        layoutLeft.setGravity(Gravity.RIGHT);
        
        layoutCenter = new LinearLayout(this);
        layoutCenter.setLayoutParams(new LayoutParams(dm.widthPixels, LayoutParams.WRAP_CONTENT));
        
        layoutRight = new LinearLayout(this);
        layoutRight.setLayoutParams(new LayoutParams(0, LayoutParams.WRAP_CONTENT));
        layoutRight.setGravity(Gravity.LEFT);
        
        Button btA = new Button(this);
        btA.setText("按钮A");
        btA.setSingleLine(true);
        
        Button btB = new Button(this);
        btB.setText("按钮B");
        btB.setSingleLine(true);
        
        layoutLeft.addView(btA);
        layoutRight.addView(btB);
        
        layout.addView(layoutLeft);
        layout.addView(layoutCenter);
        layout.addView(layoutRight);
        
        setContentView(layout);
        
        Looper looper = Looper.myLooper();
        messageHandler = new MessageHandler(looper);
        
        new Thread(new Runnable()
        {
			@Override
			public void run()
			{
				int speed = 5;		//每次移动间隔毫秒，数字越大越慢
				int speedPx = 1;	//每次移动间隔像素，数字越大越快
				int loopCount = dm.widthPixels/2;
				int i=1;
				while(i < loopCount)
				{
					Message message = Message.obtain();
					message.what = 1;
					message.arg1 = i;
	                messageHandler.sendMessage(message);
	                
	                i = i + speedPx;
	                
	                synchronized(this)
					{
					    try
					    {
							wait(speed);
						}
					    catch (InterruptedException e)
					    {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
					}
				}
				
				i=0;
				while(i < 10)
				{
					Message message = Message.obtain();
					message.what = 1;
					message.arg1 = loopCount - i;
	                messageHandler.sendMessage(message);
	                
	                i = i + speedPx;
	                
	                synchronized(this)
					{
					    try
					    {
							wait(speed);
						}
					    catch (InterruptedException e)
					    {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
					}
				}
			}
        }).start();

    }
    
    class MessageHandler extends Handler
    {
    	public MessageHandler(Looper looper)
    	{
    		super(looper);
        }
        @Override
        public void handleMessage(Message msg)
        {
        	switch (msg.what)
        	{        	
        	case 1:
        		layoutLeft.setLayoutParams(new LayoutParams(msg.arg1, LayoutParams.WRAP_CONTENT));
        		layoutRight.setLayoutParams(new LayoutParams(msg.arg1, LayoutParams.WRAP_CONTENT));
        		layoutCenter.setLayoutParams(new LayoutParams(dm.widthPixels - msg.arg1 * 2, LayoutParams.WRAP_CONTENT));
        		break;
        	}        	
        }
    }
}

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