本来以为在代码中实现按钮的移动只要给这个按钮设置touch监听,然后在MotionEvent.ACTION_MOVE中 获取当前的坐标x y,直接设置给控件就行呢...结果可像而知...显然失败

然后就有了下面的这些代码:

布局很简单,直接一个相对布局,放一个按钮:

android:id="@+id/rl_main"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

android:id="@+id/btn_move"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_centerHorizontal="true"

android:layout_centerVertical="true"

android:text="HELLO" />

程序代码,只要是实现了ontouch监听,然后在move中进行操作:

package com.example.testmovebutton;

import android.animation.AnimatorSet;

import android.animation.ObjectAnimator;

import android.app.Activity;

import android.content.Context;

import android.os.Bundle;

import android.util.Log;

import android.view.MotionEvent;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.View.OnTouchListener;

import android.view.WindowManager;

import android.widget.Button;

import android.widget.Toast;

public class Main extends Activity {

private Button moveButton;

// 控件上一次所处的坐标

private float lastX = 0;

private float lastY = 0;

// 屏幕的宽度和高度

private int screenWidth;

private int screenHeight;

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

initView();

}

private void initView() {

// 获取屏幕的宽度和高度

WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);

screenWidth = windowManager.getDefaultDisplay().getWidth();

screenHeight = windowManager.getDefaultDisplay().getHeight();

moveButton = (Button) findViewById(R.id.btn_move);

moveButton.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

Toast.makeText(Main.this, "hello click", Toast.LENGTH_SHORT)

.show();

}

});

moveButton.setOnTouchListener(new OnTouchListener() {

@Override

public boolean onTouch(View v, MotionEvent event) {

switch (event.getAction()) {

case MotionEvent.ACTION_DOWN:

//获取点击时x y 轴的数据

lastX = event.getRawX();

lastY = event.getRawY();

break;

case MotionEvent.ACTION_UP:

Log.d("test", "up" + event.getX() + ":" + event.getY());

//触摸弹起的时候来一个小动画

startAnimation();

break;

case MotionEvent.ACTION_MOVE:

//在move中直接把得到的坐标设置为控件的坐标..果然天真单纯

// v.setX(event.getX());

// v.setY(event.getY());

//获得x y轴的偏移量

int dx = (int) (event.getRawX() - lastX);

int dy = (int) (event.getRawY() - lastY);

//获得控件上下左右的位置信息,加上我们的偏移量,新得到的位置就是我们

//控件将要出现的位置

int l = v.getLeft() + dx;

int b = v.getBottom() + dy;

int r = v.getRight() + dx;

int t = v.getTop() + dy;

//判断四个实际位置,如果有一边已经划出屏幕,那就把这边位置设置为0

//然后相反的边的位置就设置成控件的高度或者宽度

if (l < 0) {

l = 0;

r = l + v.getWidth();

}

if (t < 0) {

t = 0;

b = t + v.getHeight();

}

if (r > screenWidth) {

r = screenWidth;

l = r - v.getWidth();

}

if (b > screenHeight) {

b = screenHeight;

l = b - v.getHeight();

}

//然后使用我们view的layout重新在布局中把我们的控件画出来

v.layout(l, t, r, b);

//并把现在的x y设置给lastx lasty

lastX = (int) event.getRawX();

lastY = (int) event.getRawY();

v.postInvalidate();//绘画

break;

default:

break;

}

return false;

}

});

}

/**

* 启动一个动画

*/

public void startAnimation() {

//先获取当前控件的x坐标

//然后向右五次,向左一次回来

float x = moveButton.getX();

ObjectAnimator objectAnimator1 = ObjectAnimator.ofFloat(moveButton,

"X", x-100,x+100);

ObjectAnimator objectAnimator2 = ObjectAnimator.ofFloat(moveButton,

"X", x+100,x);

objectAnimator1.setRepeatCount(4);

objectAnimator2.setRepeatCount(0);

AnimatorSet animatorSet = new AnimatorSet();

animatorSet.play(objectAnimator2).after(objectAnimator1);

animatorSet.setDuration(100);

animatorSet.start();

}

} 到现在,,就结束了..程序很简单