本文实例为大家分享了Android使用入门第二十七篇点赞动画的具体代码，供大家参考，具体内容如下
MainActivity.java代码:
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 ? null : mList.get((int)obj);
}
}
}
DivergeViewSecond.java代码:
package siso.likeanimation;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PointF;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;
import java.util.concurrent.CopyOnWriteArrayList;
public class DivergeViewSecond extends View implements Runnable{
public static final float mDuration = 0.010F;
public static final int mDefaultHeight = 100;
protected static final long mQueenDuration = 200;
protected final Random mRandom = new Random();
protected ArrayList<DivergeInfo> mDivergeInfos;
protected List<Object> mQueen;
protected PointF mPtStart;
protected PointF mPtEnd;
protected ArrayList<DivergeInfo> mDeadPool = new ArrayList<>();
private Paint mPaint;
// private static final int mDefaultWidth = 100;
// private static final int mAlphaOffset = 50;
private DivergeViewProvider mDivergeViewProvider;
private long mLastAddTime = 0;
private Thread mThread;
private boolean mRunning = true;
private boolean mIsDrawing = false;
public DivergeViewSecond(Context context) {
this(context, null);
}
public DivergeViewSecond(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public DivergeViewSecond(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
@Override
public void run() {
while(mRunning){
if(mDivergeViewProvider == null){
continue;
}
if(mQueen == null){
continue;
}
if(mIsDrawing){
//如果正在绘制，不要处理数据
continue;
}
if(mDivergeInfos == null){
continue;
}
dealQueen();
if(mDivergeInfos.size() == 0){
continue;
}
dealDiverge();
mIsDrawing = true;
postInvalidate();
}
//停止
release();
}
private void dealDiverge(){
for (int i = 0; i < mDivergeInfos.size(); i++) {
DivergeInfo divergeInfo = mDivergeInfos.get(i);
float timeLeft = 1.0F - divergeInfo.mDuration;
divergeInfo.mDuration += mDuration;
float x, y;
//二次贝塞尔
float time1 = timeLeft * timeLeft;
float time2 = 2 * timeLeft * divergeInfo.mDuration;
float time3 = divergeInfo.mDuration * divergeInfo.mDuration;
x = time1 * (mPtStart.x)
+ time2 * (divergeInfo.mBreakPoint.x)
+ time3 * (divergeInfo.mEndPoint.x);
divergeInfo.mX = x;
y = time1 * (mPtStart.y)
+ time2 * (divergeInfo.mBreakPoint.y)
+ time3 * (divergeInfo.mEndPoint.y);
divergeInfo.mY = y;
if (divergeInfo.mY <= divergeInfo.mEndPoint.y) {
mDivergeInfos.remove(i);
mDeadPool.add(divergeInfo);
i--;
continue;
}
}
}
private void dealQueen(){
long now = System.currentTimeMillis();
if(mQueen.size() > 0 && now - mLastAddTime > mQueenDuration){
mLastAddTime = System.currentTimeMillis();
DivergeInfo divergeInfo = null;
if(mDeadPool.size() > 0){
//死池里面有空闲的divergeNode
divergeInfo = mDeadPool.get(0);
mDeadPool.remove(0);
}
if(divergeInfo == null){
divergeInfo = createDivergeNode(mQueen.get(0));
}
divergeInfo.reset();
divergeInfo.mType = mQueen.get(0);
mDivergeInfos.add(divergeInfo);
mQueen.remove(0);
}
}
public interface DivergeViewProvider{
public Bitmap getBitmap(Object obj);
}
private void init(){
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
//不需要支持wrap_content
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
}
public void setDivergeViewProvider(DivergeViewProvider divergeViewProvider){
mDivergeViewProvider = divergeViewProvider;
}
public PointF getStartPoint(){
return mPtStart;
}
public boolean isRunning(){
return mRunning;
}
public void startDiverges(Object obj){
if(mDivergeInfos == null){
mDivergeInfos = new ArrayList<>(30);
}
if(mQueen == null){
mQueen = Collections.synchronizedList(new ArrayList<>(30));
}
mQueen.add(obj);
// for(Object obj : objs) {
// mQueen.add(obj);
// }
if(mThread == null) {
mThread = new Thread(this);
mThread.start();
}
}
public void stop(){
if(mDivergeInfos != null){
mDivergeInfos.clear();
}
if(mQueen != null){
mQueen.clear();
}
if(mDeadPool != null){
mDeadPool.clear();
}
}
public void release(){
stop();
mPtEnd = null;
mPtStart = null;
mDivergeInfos = null;
mQueen = null;
mDeadPool = null;
}
public void setStartPoint(PointF point){
mPtStart = point;
}
public void setEndPoint(PointF point){
mPtEnd = point;
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
mRunning = false;
}
@Override
protected void onDraw(Canvas canvas) {
if(mRunning && mDivergeViewProvider != null && mDivergeInfos != null){
for(DivergeInfo divergeInfo : mDivergeInfos){
mPaint.setAlpha((int)(255 * divergeInfo.mY / mPtStart.y));
canvas.drawBitmap(mDivergeViewProvider.getBitmap(divergeInfo.mType),
divergeInfo.mX,
divergeInfo.mY,
mPaint);
}
}
mIsDrawing = false;
}
private PointF getBreakPointF(int scale1, int scale2) {
PointF pointF = new PointF();
pointF.x = mRandom.nextInt((getMeasuredWidth() - getPaddingRight() + getPaddingLeft()) / scale1) + getMeasuredWidth() / scale2;
pointF.y = mRandom.nextInt((getMeasuredHeight() - getPaddingBottom() + getPaddingTop()) / scale1) + getMeasuredHeight() / scale2;
return pointF;
}
protected DivergeInfo createDivergeNode(Object type){
PointF endPoint = mPtEnd;
if(endPoint == null){
endPoint = new PointF(mRandom.nextInt(getMeasuredWidth()),0);
}
// int height = mDivergeViewProvider == null ? mDefaultHeight : mDivergeViewProvider.getBitmap(type).getHeight();
if(mPtStart == null) {
mPtStart = new PointF(getMeasuredWidth() / 2, getMeasuredHeight() - mDefaultHeight);//默认起始高度
}
return new DivergeInfo(
mPtStart.x,
mPtStart.y,
getBreakPointF(2, 3),
endPoint,
type);
}
public class DivergeInfo {
public float mDuration;
public PointF mBreakPoint;
public PointF mEndPoint;
public float mX;
public float mY;
public Object mType;
public float mStartX;
public float mStartY;
public DivergeInfo(float x, float y, PointF breakPoint, PointF endPoint, Object type){
mDuration = 0.0f;
mEndPoint = endPoint;
mX = x;
mY = y;
mStartX = x;
mStartY = y;
mBreakPoint = breakPoint;
mType = type;
}
public void reset(){
mDuration = 0.0f;
mX = mStartX;
mY = mStartY;
}
}
}
activity_main.xml内容:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="siso.likeanimation.MainActivity">
<Button
android:id="@+id/btnStart"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="开始"/>
<siso.likeanimation.DivergeViewSecond
android:id="@+id/divergeView"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_width="130dp"
android:layout_height="300dp"/>
<ImageView
android:id="@+id/iv_start"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:background="@drawable/ic_praise_sm6"/>
</RelativeLayout>
运行结果如图：
