Android 自定义动画 LoadingView

项目地址：https://github.com/CuteWiseCode/MyLoadingView

先上效果图

实现思路：代码实现主要结合自定义view 以及动画属性的方式，根据需求调整动画的展示方式、加速度等。

一、动画的布局文件

将白色背景图以及需要转动的图片资源引用到布局文件中。布局文件以FrameLayout 作为父view,默认展示背景图以及第一个转动的图片。

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent" android:layout_gravity="center"><ImageViewandroid:layout_gravity="center"android:layout_width="86.0dip"android:layout_height="86.0dip"android:background="@mipmap/bg_animation" /><ImageViewandroid:layout_gravity="center"android:id="@+id/loading_view_01"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@mipmap/loading_01" /><ImageViewandroid:layout_gravity="center"android:id="@+id/loading_view_02"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@mipmap/loading_02"android:visibility="invisible" /><ImageViewandroid:layout_gravity="center"android:id="@+id/loading_view_03"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@mipmap/loading_03"android:visibility="invisible" /><ImageViewandroid:layout_gravity="center"android:id="@+id/loading_view_04"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@mipmap/loading_04"android:visibility="invisible" /><ImageViewandroid:layout_gravity="center"android:id="@+id/loading_view_05"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@mipmap/loading_05"android:visibility="invisible" /></FrameLayout>

二、创建一个 AnimationView 类

2.1、继承 FrameLayout ,重写两个构造函数 AnimationView(Context paramContext) 和 AnimationView(@NonNull Context context, @Nullable AttributeSet attrs) ，了解自定义View的童鞋应该知道，第一个构造函数用于在代码中新建时调用，第二个构造函数用户在布局文件中定义时调用。

 //构造函数public AnimationView(Context paramContext){super(paramContext);inflate(getContext(), R.layout.loading_view, this);//layout_loading_viewinitializeView();}public AnimationView(@NonNull Context context, @Nullable AttributeSet attrs) {super(context, attrs);inflate(getContext(), R.layout.loading_view, this);//layout_loading_viewinitializeView();}

2.2、在构造函数中解析布局文件，并进行初始化

/*** 初始化控件*/private void initializeView(){this.viewf = ((ImageView)findViewById(R.id.loading_view_01));this.viewg = ((ImageView)findViewById(R.id.loading_view_02));this.viewh = ((ImageView)findViewById(R.id.loading_view_03));this.viewi = ((ImageView)findViewById(R.id.loading_view_04));this.viewj = ((ImageView)findViewById(R.id.loading_view_05));this.viewe = this.viewf;//测量控件的大小 UNSPECIFIED = 0 EXACTLY = 1 AT_MOST= 2int m = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);int n = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);this.viewf.measure(m, n);this.floata = (this.viewf.getMeasuredWidth() / 2);//获取宽的值，除2this.floatb = (this.viewf.getMeasuredHeight() / 2);//获取高的值除2initView();//开始动画}

2.3、设置并开始动画，注意这里使用到动画监听 animationListener

 public void initView(){tostartAnimation(this.viewe, 0.0F, 90.0F);}

/*** * @param paramView 具体某个view* @param paramFloat1 0.0f* @param paramFloat2 90.0f* * */private void tostartAnimation(View paramView, float paramFloat1, float paramFloat2){AnimationLoad animation = new AnimationLoad(paramFloat1, paramFloat2, this.floata, this.floatb, this.floatc, true);animation.setDuration(this.intk);animation.setFillAfter(true);//true if the animation should apply its transformation after it endsanimation.setInterpolator(new AccelerateInterpolator());//Sets the acceleration curve for this animation. Defaults to a linear interpolation.Parameters:i The interpolator which defines the acceleration curveanimation.setAnimationListener(new animationListener());//the animation listener to be notifiedparamView.startAnimation(animation);}

监听类：animationListener。在动画结束的时候，启动runnable,启动另一个动画

 private final class animationListenerimplements Animation.AnimationListener{private animationListener(){}public void onAnimationEnd(Animation paramAnimation){//The Runnable that will be executed.AnimationView.this.post(new runnable());}public void onAnimationRepeat(Animation paramAnimation){}public void onAnimationStart(Animation paramAnimation){}}

runnable 线程：

 private final class runnableimplements Runnable{private runnable(){}public void run(){viewf.setVisibility(View.GONE);//1viewg.setVisibility(View.GONE);//2viewh.setVisibility(View.GONE);//3viewi.setVisibility(View.GONE);//4viewj.setVisibility(View.GONE);//5viewe.setVisibility(View.GONE);intd++;if (intd % 5 == 0)//intdsetData(viewf);//第一张while (true){if (1 == intd % 5){setData( viewg);
//                  continue;}if (2 == intd % 5){setData( viewh);
//                  continue;}if (3 == intd % 5){setData( viewi);
//                  continue;}if (4 == intd % 5)setData( viewj);viewe.setVisibility(View.VISIBLE);viewe.requestFocus();AnimationLoad animation = new AnimationLoad(-90.0F, 0.0F, floata, floatb, floatc, false);animation.setDuration(intk);animation.setFillAfter(true);animation.setInterpolator(new DecelerateInterpolator());//减速animation.setAnimationListener(new Animation.AnimationListener(){public void onAnimationEnd(Animation paramAnimation){AnimationView.this.initView();}public void onAnimationRepeat(Animation paramAnimation){}public void onAnimationStart(Animation paramAnimation){}});viewe.startAnimation(animation);return;}}}

上述代码中 AnimationLoad 类如下：继承了Animation，使用Camera 以及Matrix 定义了旋转的方式。

  private final float floata;private final float floatb;private final float floatc;private final float floatd;private final float floate;private final boolean boolf;private Camera camerag;public AnimationLoad(float paramFloat1, float paramFloat2, float paramFloat3, float paramFloat4, float paramFloat5, boolean paramBoolean){this.floata = paramFloat1;//0this.floatb = paramFloat2;//90.0fthis.floatc = paramFloat3;//172this.floatd = paramFloat4;//172this.floate = paramFloat5;//0this.boolf = paramBoolean;}protected void applyTransformation(float paramFloat, Transformation paramTransformation){float f1 = this.floata;//0.0ffloat f2 = f1 + paramFloat * (this.floatb - f1);//90float f3 = this.floatc;//172float f4 = this.floatd;//172Camera localCamera = this.camerag;Matrix localMatrix = paramTransformation.getMatrix();localCamera.save();//Saves the camera state. Each save should be balanced with a call to restore().//如果时加速if (this.boolf)localCamera.translate(0.0F, 0.0F, paramFloat * this.floate);//Applies a translation transform on all three axislocalCamera.translate(0.0F, 0.0F, this.floate * (1.0F - paramFloat));while (true){localCamera.rotateY(f2);//Applies a rotation transform around the Y axis.localCamera.getMatrix(localMatrix);//Computes the matrix corresponding to the current transformation and copies it to the supplied matrix object.localCamera.restore();//Restores the saved state, if any
//      localMatrix.postScale(0.5f, 0.5f);//使原来的图像缩放成原来的1/2localMatrix.preTranslate(-f3, -f4);localMatrix.postTranslate(f3, f4);return;}}/*** Initialize this animation with the dimensions of the object being animated */public void initialize(int paramInt1, int paramInt2, int paramInt3, int paramInt4){super.initialize(paramInt1, paramInt2, paramInt3, paramInt4);this.camerag = new Camera();}

分享到此结束，demo 请前往github, 记得给个star哦