Android动画效果(一) 任意两点间的抛物线动画

先上图：

这里要实现的是，点击上面的按钮后，将TextView随机移动到底部按钮的位置

首先，将底部按钮放入list中，方便后面随机取值

list = new ArrayList<Button>();list.add(btn1);list.add(btn2);list.add(btn3);list.add(btn4);

 

然后就是点击按钮后的抛物线动画了

点击按钮后，先写一个数组用来存储点击按钮的X、Y坐标，然后new一个用来展示抛物线的控件，楼主这里用的TextView，也可以换成其他任何控件

int[] start_location = new int[2];// 一个整型数组，用来存储按钮的在屏幕的X、Y坐标v.getLocationInWindow(start_location);// 这是获取当前点击的按钮在屏幕的X、Y坐标（这也是动画开始的坐标）TextView te = new TextView(this);te.setText("啊");

接下来，将要移动的控件放入一个动画层中

ViewGroup rootView = (ViewGroup) this.getWindow().getDecorView();LinearLayout animLayout = new LinearLayout(this);LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.MATCH_PARENT);animLayout.setLayoutParams(lp);animLayout.setId(Integer.MAX_VALUE);animLayout.setBackgroundResource(android.R.color.transparent);rootView.addView(animLayout);int x = location[0];int y = location[1];LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);lp.leftMargin = x;lp.topMargin = y;view.setLayoutParams(lp);

紧接着，就是写抛物线的动画了。

抛物线其实就是两个位移动画，一个横向移动，一个竖向移动，两个动画同时执行，就有了抛物线的效果

int endX = 0 - start_location[0] + list.get(ra.nextInt(list.size())).getLeft();// 动画位移的X坐标int endY = end_location[1] - start_location[1];// 动画位移的y坐标TranslateAnimation translateAnimationX = new TranslateAnimation(0,endX, 0, 0);translateAnimationX.setInterpolator(new LinearInterpolator());translateAnimationX.setRepeatCount(0);// 动画重复执行的次数translateAnimationX.setFillAfter(true);TranslateAnimation translateAnimationY = new TranslateAnimation(0,0, 0, endY);translateAnimationY.setInterpolator(new AccelerateInterpolator());translateAnimationY.setRepeatCount(0);// 动画重复执行的次数translateAnimationX.setFillAfter(true);AnimationSet set = new AnimationSet(false);set.setFillAfter(false);set.addAnimation(translateAnimationY);set.addAnimation(translateAnimationX);set.setDuration(800);// 动画的执行时间view.startAnimation(set);

最后，监听动画，在动画执行的时候将要移动的控件显示出来，动画结束了将之隐藏

完整代码如下：

package com.example.movetest;import java.util.ArrayList;import java.util.List;import java.util.Random;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.view.animation.AccelerateInterpolator;import android.view.animation.Animation;import android.view.animation.Animation.AnimationListener;import android.view.animation.AnimationSet;import android.view.animation.LinearInterpolator;import android.view.animation.TranslateAnimation;import android.widget.Button;import android.widget.LinearLayout;import android.widget.TextView;/*** *  * @author 帽檐遮不住阳光 *  * @date 2016/5/9 * */public class MainActivity extends Activity implements OnClickListener { private List<Button> list = null; private ViewGroup viewGroup;// 动画层 private Button btn1, btn2, btn3, btn4; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  findViewById(R.id.btn).setOnClickListener(this);  btn1 = (Button) findViewById(R.id.btn1);  btn2 = (Button) findViewById(R.id.btn2);  btn3 = (Button) findViewById(R.id.btn3);  btn4 = (Button) findViewById(R.id.btn4);  list = new ArrayList<Button>();  list.add(btn1);  list.add(btn2);  list.add(btn3);  list.add(btn4); } @Override public void onClick(View v) {  // TODO Auto-generated method stub  switch (v.getId()) {  case R.id.btn:   int[] start_location = new int[2];// 一个整型数组，用来存储按钮的在屏幕的X、Y坐标   v.getLocationInWindow(start_location);// 这是获取当前点击的按钮在屏幕的X、Y坐标（这也是动画开始的坐标）   TextView te = new TextView(this);   te.setText("啊");   move(te, start_location);   break;  } } private void move(final View v, int[] start_location) {  viewGroup = null;  viewGroup = createAnimLayout();  viewGroup.addView(v);// 把要移动的控件添加到动画层  final View view = addViewToAnimLayout(viewGroup, v, start_location);  int[] end_location = new int[2];// 这是用来存储动画结束位置的X、Y坐标  Random ra = new Random();  for (int i = 0; i < list.size(); i++) {   list.get(ra.nextInt(list.size())).getLocationInWindow(end_location);   // 计算位移   int endX = 0 - start_location[0]     + list.get(ra.nextInt(list.size())).getLeft();// 动画位移的X坐标   int endY = end_location[1] - start_location[1];// 动画位移的y坐标   TranslateAnimation translateAnimationX = new TranslateAnimation(0,     endX, 0, 0);   translateAnimationX.setInterpolator(new LinearInterpolator());   translateAnimationX.setRepeatCount(0);// 动画重复执行的次数   translateAnimationX.setFillAfter(true);   TranslateAnimation translateAnimationY = new TranslateAnimation(0,     0, 0, endY);   translateAnimationY.setInterpolator(new AccelerateInterpolator());   translateAnimationY.setRepeatCount(0);// 动画重复执行的次数   translateAnimationX.setFillAfter(true);   AnimationSet set = new AnimationSet(false);   set.setFillAfter(false);   set.addAnimation(translateAnimationY);   set.addAnimation(translateAnimationX);   set.setDuration(800);// 动画的执行时间   view.startAnimation(set);   // 动画监听事件   set.setAnimationListener(new AnimationListener() {    // 动画的开始    @Override    public void onAnimationStart(Animation animation) {     v.setVisibility(View.VISIBLE);    }    @Override    public void onAnimationRepeat(Animation animation) {     // TODO Auto-generated method stub    }    // 动画的结束    @Override    public void onAnimationEnd(Animation animation) {     v.setVisibility(View.GONE);    }   });   break;  } } /**  * 创建动画层  *   * @return  */ private ViewGroup createAnimLayout() {  ViewGroup rootView = (ViewGroup) this.getWindow().getDecorView();  LinearLayout animLayout = new LinearLayout(this);  LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(    LinearLayout.LayoutParams.MATCH_PARENT,    LinearLayout.LayoutParams.MATCH_PARENT);  animLayout.setLayoutParams(lp);  animLayout.setId(Integer.MAX_VALUE);  animLayout.setBackgroundResource(android.R.color.transparent);  rootView.addView(animLayout);  return animLayout; } private View addViewToAnimLayout(final ViewGroup vg, final View view,   int[] location) {  int x = location[0];  int y = location[1];  LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(    LinearLayout.LayoutParams.WRAP_CONTENT,    LinearLayout.LayoutParams.WRAP_CONTENT);  lp.leftMargin = x;  lp.topMargin = y;  view.setLayoutParams(lp);  return view; }}

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