Android动画图标——I am not a gif maker,I am a developer

最早在git上发现一个很酷眩的动画图标效果：https://github.com/xuyisheng/tickplusdrawable

不得不说，国外的程序员在细节的考虑上，确实比我们要好很多，ok，今天我们就来模仿下这个：现来看看我们的效果，别喷我，就写了个把小时，很多细节还没考虑全，代码也还没重构，希望大家能提出修改意见，thx～
gif效果不一定好，大家可以参考github的gif。



代码如下：
首先我们要来了解下原理：
1、我们首先来确定一些关键点的坐标，也就是我们要显示的图形的所有出现的顶点2、线条的移动效果，我们使用属性动画来控制，不熟悉的朋友可以看看http://blog.csdn.net/eclipsexys/article/details/38401641，通过这个例子大家应该会对属性动画有更深的理解了3、对于没有提供get、set方法的属性，我们通过重写Property来帮助这个属性增加get、set方法
了解了以上内容，就可以来看具体的代码了：package com.example.yishengxu.canvas;

import android.animation.ObjectAnimator;
import android.animation.TypeEvaluator;
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PointF;
import android.util.AttributeSet;
import android.util.Property;
import android.view.MotionEvent;
import android.view.View;

import java.util.ArrayList;
import java.util.List;

/**
* Created by yisheng.xu on 10/30/14.
*/
public class CanvasView extends View {

private float mPaddingW;
private float mPaddingH;

private float mRotation;

private List<PointF> mAllPoints = new ArrayList<PointF>();

private PointF mPoint0;
private PointF mPoint1;
private PointF mPoint2;
private PointF mPoint3;
private PointF mPoint4;
private PointF mPoint5;
private PointF mPoint6;
private PointF mPoint7;

private Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);

private int touchFlag = 0;

public CanvasView(Context context) {
super(context);
}

public CanvasView(Context context, AttributeSet attrs) {
super(context, attrs);
}

public CanvasView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}

@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
mPaddingW = w / 4;
mPaddingH = h / 4;

mAllPoints.add(new PointF(mPaddingW, mPaddingH));
mAllPoints.add(new PointF(mPaddingW * 3, mPaddingH));
mAllPoints.add(new PointF(mPaddingW, mPaddingH * 2));
mAllPoints.add(new PointF(mPaddingW * 3, mPaddingH * 2));
mAllPoints.add(new PointF(mPaddingW, mPaddingH * 3));
mAllPoints.add(new PointF(mPaddingW * 3, mPaddingH * 3));
mAllPoints.add(new PointF(mPaddingW * 2, mPaddingH));
mAllPoints.add(new PointF(mPaddingW * 2, mPaddingH * 3));

initPoints();

mPaint.setColor(Color.BLUE);
mPaint.setStrokeWidth(20);
mPaint.setStrokeCap(Paint.Cap.ROUND);
super.onSizeChanged(w, h, oldw, oldh);
}

private void initPoints() {
mPoint0 = new PointF(mAllPoints.get(0).x, mAllPoints.get(0).y);
mPoint1 = new PointF(mAllPoints.get(1).x, mAllPoints.get(1).y);
mPoint2 = new PointF(mAllPoints.get(2).x, mAllPoints.get(2).y);
mPoint3 = new PointF(mAllPoints.get(3).x, mAllPoints.get(3).y);
mPoint4 = new PointF(mAllPoints.get(4).x, mAllPoints.get(4).y);
mPoint5 = new PointF(mAllPoints.get(5).x, mAllPoints.get(5).y);
mPoint6 = new PointF();
mPoint7 = new PointF();
}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.save();
canvas.rotate(180 * mRotation, mPaddingW * 2, mPaddingH * 2);
drawLine(canvas, mPoint0, mPoint1);
drawLine(canvas, mPoint2, mPoint3);
drawLine(canvas, mPoint4, mPoint5);
drawLine(canvas, mPoint6, mPoint7);
canvas.restore();
}

private void drawLine(Canvas canvas,PointF start,PointF end) {
if (start.x!=0 && end.x !=0) {
canvas.drawLine(start.x, start.y, end.x, end.y, mPaint);
}
}

@Override
public boolean onTouchEvent(MotionEvent event) {
if (touchFlag == 0) {
animPoints(mPoint0, mAllPoints.get(2));
animPoints(mPoint4, mAllPoints.get(2));
animPoints(mPoint1, mAllPoints.get(6));
animPoints(mPoint5, mAllPoints.get(7));
touchFlag += 1;
}else if (touchFlag == 1) {
resetPoints();
touchFlag += 1;
}else if (touchFlag == 2) {
animPoints(mPoint0, mAllPoints.get(4));
animPoints(mPoint4, mAllPoints.get(0));
mPoint2 = new PointF(0, 0);
mPoint3 = new PointF(0, 0);
invalidate();
touchFlag += 1;
} else if (touchFlag == 3) {
resetPoints();
touchFlag += 1;
} else {
animPoints(mPoint0, mAllPoints.get(6));
animPoints(mPoint1, mAllPoints.get(3));
animPoints(mPoint5, mAllPoints.get(6));
mPoint2 = new PointF(0, 0);
mPoint3 = new PointF(0, 0);
invalidate();
touchFlag = 1;
}

return super.onTouchEvent(event);
}

private void resetPoints() {
animPoints(mPoint0, mAllPoints.get(0));
animPoints(mPoint1, mAllPoints.get(1));
animPoints(mPoint2, mAllPoints.get(2));
animPoints(mPoint3, mAllPoints.get(3));
animPoints(mPoint4, mAllPoints.get(4));
animPoints(mPoint5, mAllPoints.get(5));
}

private void animPoints(final PointF start, final PointF end) {
ValueAnimator animator = ValueAnimator.ofObject(new TypeEvaluator<PointF>() {
@Override
public PointF evaluate(float v, PointF o, PointF o2) {
start.x = start.x + (end.x - start.x) * v;
start.y = start.y + (end.y - start.y) * v;
invalidate();
return null;
}
}, start, end);
animator.setDuration(1000);
animator.start();
ObjectAnimator animator1 = ObjectAnimator.ofFloat(this, mRotationProperty, 0, 1F);
animator1.setDuration(500);
animator1.start();
}

private Property<CanvasView, Float> mRotationProperty = new Property<CanvasView, Float>(Float.class, "rotation") {
@Override
public Float get(CanvasView object) {
return object.mRotation;
}

@Override
public void set(CanvasView object, Float value) {
object.mRotation = value;
}
};
}

布局文件和主文件很简单：<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:paddingLeft="50dp"
android:paddingRight="50dp"
android:paddingTop="150dp"
android:paddingBottom="150dp"
tools:context=".MainActivity">

<view
android:layout_width="wrap_content"
android:layout_height="wrap_content"
class="com.example.yishengxu.canvas.CanvasView"
android:id="@+id/view"
android:layout_alignParentStart="true" />
</RelativeLayout>

package com.example.yishengxu.canvas;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}

OK，关键还是要有脑子，有idea，在现有知识的基础上，加工、创造。现在，5.0来了，新增了Vector Drawable，以及对SVG的支持，让我们对实现更复杂的路径轨迹动画效果，有了更强大的工具。
最后，打个广告——友情链接 HZTalk~非常好的，说科技、聊电影、游戏，真独立，非客观，第三方.
以上。