在Android项目中实现一个点赞动画

package siso.likeanimation;import android.graphics.Bitmap;import android.graphics.PointF;import android.graphics.drawable.BitmapDrawable;import android.support.v4.content.res.ResourcesCompat;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.ImageView;import java.util.ArrayList;public class MainActivity extends AppCompatActivity { private DivergeViewSecond mDivergeView; private Button mBtnStart; private ImageView mImageView; private ArrayList<Bitmap> mList; private int mIndex = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mBtnStart = (Button)findViewById(R.id.btnStart); mImageView = (ImageView)findViewById(R.id.iv_start); mList = new ArrayList<>(); mList.add(((BitmapDrawable) ResourcesCompat.getDrawable(getResources(), R.drawable.ic_praise_sm1, null)).getBitmap()); mList.add(((BitmapDrawable) ResourcesCompat.getDrawable(getResources(),R.drawable.ic_praise_sm2,null)).getBitmap()); mList.add(((BitmapDrawable) ResourcesCompat.getDrawable(getResources(),R.drawable.ic_praise_sm3,null)).getBitmap()); mList.add(((BitmapDrawable) ResourcesCompat.getDrawable(getResources(),R.drawable.ic_praise_sm4,null)).getBitmap()); mList.add(((BitmapDrawable) ResourcesCompat.getDrawable(getResources(),R.drawable.ic_praise_sm5,null)).getBitmap()); mList.add(((BitmapDrawable) ResourcesCompat.getDrawable(getResources(), R.drawable.ic_praise_sm6, null)).getBitmap()); mBtnStart.setOnClickListener(new View.OnClickListener() {  @Override  public void onClick(View v) {  if(mIndex == 5){   mIndex = 0 ;  }  mDivergeView.startDiverges(mIndex);  mIndex ++;//  if (mDivergeView.isRunning()) {//   mDivergeView.stop();//  } else {////  }  } }); mDivergeView = (DivergeViewSecond) findViewById(R.id.divergeView); mDivergeView.post(new Runnable() {  @Override  public void run() {  mDivergeView.setEndPoint(new PointF(mDivergeView.getMeasuredWidth()/2,0));  mDivergeView.setDivergeViewProvider(new Provider());  } });// mDivergeView.start(); } @Override protected void onDestroy() { super.onDestroy(); if(mList != null){  mList.clear();  mList = null; } } class Provider implements DivergeViewSecond.DivergeViewProvider{ @Override public Bitmap getBitmap(Object obj) {  return mList == null &#63; null : mList.get((int)obj); } }}