Android 实现 按钮从两边移到中间动画效果html

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;

}

}

}

}