android 实现可以拖动的按钮

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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:

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/rl_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <Button        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" /></RelativeLayout>

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;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.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() {@Overridepublic void onClick(View v) {Toast.makeText(Main.this, "hello click", Toast.LENGTH_SHORT).show();}});moveButton.setOnTouchListener(new OnTouchListener() {@Overridepublic 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 lastylastX = (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

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