Android 实现 按钮从两边移到中间动画效果

               

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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