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.csdn.net/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()        {@Overridepublic 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 blocke.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 blocke.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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