Android動畫效果(一) 任意兩點間的拋物線動畫

先上圖：

 

這裡要實現的是，點擊上面的按鈕後，將TextView隨機移動到底部按鈕的位置       首先，將底部按鈕放入list中，方便後面隨機取值   list = new ArrayList<Button>(); list.add(btn1); list.add(btn2); list.add(btn3); list.add(btn4);   然後就是點擊按鈕後的拋物線動畫了   點擊按鈕後，先寫一個數組用來存儲點擊按鈕的X、Y坐標，然後new一個用來展示拋物線的控件，樓主這裡用的TextView，也可以換成其他任何控件   int[] start_location = new int[2];// 一個整型數組，用來存儲按鈕的在屏幕的X、Y坐標 v.getLocationInWindow(start_location);// 這是獲取當前點擊的按鈕在屏幕的X、Y坐標（這也是動畫開始的坐標） TextView te = new TextView(this); te.setText("啊");     接下來，將要移動的控件放入一個動畫層中   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);   緊接著，就是寫拋物線的動畫了。   拋物線其實就是兩個位移動畫，一個橫向移動，一個豎向移動，兩個動畫同時執行，就有了拋物線的效果   int endX = 0 - start_location[0] + list.get(ra.nextInt(list.size())).getLeft();// 動畫位移的X坐標 int endY = end_location[1] - start_location[1];// 動畫位移的y坐標 TranslateAnimation translateAnimationX = new TranslateAnimation(0,endX, 0, 0); translateAnimationX.setInterpolator(new LinearInterpolator());   translateAnimationX.setRepeatCount(0);// 動畫重復執行的次數 translateAnimationX.setFillAfter(true);   TranslateAnimation translateAnimationY = new TranslateAnimation(0,0, 0, endY); translateAnimationY.setInterpolator(new AccelerateInterpolator()); translateAnimationY.setRepeatCount(0);// 動畫重復執行的次數 translateAnimationX.setFillAfter(true);   AnimationSet set = new AnimationSet(false); set.setFillAfter(false); set.addAnimation(translateAnimationY); set.addAnimation(translateAnimationX); set.setDuration(800);// 動畫的執行時間 view.startAnimation(set);       最後，監聽動畫，在動畫執行的時候將要移動的控件顯示出來，動畫結束了將之隱藏       完整代碼如下：   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 帽檐遮不住陽光  *   * @date 2016/5/9  *  */ public class MainActivity extends Activity implements OnClickListener {    private List<Button> list = null;  private ViewGroup viewGroup;// 動畫層  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];// 一個整型數組，用來存儲按鈕的在屏幕的X、Y坐標    v.getLocationInWindow(start_location);// 這是獲取當前點擊的按鈕在屏幕的X、Y坐標（這也是動畫開始的坐標）    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);// 把要移動的控件添加到動畫層   final View view = addViewToAnimLayout(viewGroup, v, start_location);   int[] end_location = new int[2];// 這是用來存儲動畫結束位置的X、Y坐標   Random ra = new Random();   for (int i = 0; i < list.size(); i++) {    list.get(ra.nextInt(list.size())).getLocationInWindow(end_location);    // 計算位移    int endX = 0 - start_location[0]      + list.get(ra.nextInt(list.size())).getLeft();// 動畫位移的X坐標    int endY = end_location[1] - start_location[1];// 動畫位移的y坐標    TranslateAnimation translateAnimationX = new TranslateAnimation(0,      endX, 0, 0);    translateAnimationX.setInterpolator(new LinearInterpolator());    translateAnimationX.setRepeatCount(0);// 動畫重復執行的次數    translateAnimationX.setFillAfter(true);      TranslateAnimation translateAnimationY = new TranslateAnimation(0,      0, 0, endY);    translateAnimationY.setInterpolator(new AccelerateInterpolator());    translateAnimationY.setRepeatCount(0);// 動畫重復執行的次數    translateAnimationX.setFillAfter(true);      AnimationSet set = new AnimationSet(false);    set.setFillAfter(false);    set.addAnimation(translateAnimationY);    set.addAnimation(translateAnimationX);    set.setDuration(800);// 動畫的執行時間    view.startAnimation(set);    // 動畫監聽事件    set.setAnimationListener(new AnimationListener() {     // 動畫的開始     @Override     public void onAnimationStart(Animation animation) {      v.setVisibility(View.VISIBLE);     }       @Override     public void onAnimationRepeat(Animation animation) {      // TODO Auto-generated method stub     }       // 動畫的結束     @Override     public void onAnimationEnd(Animation animation) {      v.setVisibility(View.GONE);     }    });    break;   }  }    /**   * 創建動畫層   *    * @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;  }   }