仿58的加载动画

前言

这里写图片描述

这是仿照58同城的加载动画。主要用到的知识点包括自定义view和和属性动画。这个是不难的。

showtime

第一，先考虑自定义view 继承谁（Linealayout）

package jftclient.shuhui.com.a58;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.content.Context;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.DecelerateInterpolator;
import android.widget.ImageView;
import android.widget.LinearLayout;

import javax.xml.transform.dom.DOMLocator;

/**
 * Created by 梁想想 on 2018/3/27.
 */

public class Loadding extends LinearLayout {
    private Context mContext ;
    public  static  final  int Animation_Duration = 500 ;
    private FloatView floatView;
    private ImageView shadeView;
    private  Shape mCurrentShape = Shape.SHAPE_CIRCLE ;

    enum  Shape{
        SHAPE_CIRCLE, SHAPE_TRIANGLE, SHAPE_RECTANGLE
    }

    public Loadding(Context context) {
        this(context,null);
    }

    public Loadding(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs,0);
    }

    public Loadding(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        View view = View.inflate(context, R.layout.item_loadding, this);
        floatView = (FloatView) view.findViewById(R.id.floatView);
        shadeView = (ImageView) view.findViewById(R.id.shadeView);
        mContext = context ;

        startDownAnimation();
    }

    private void startDownAnimation() {
        //开始下落
        ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(floatView,
                "translationY",
                ScreenUtils.dip2px(mContext, 40));
        ObjectAnimator objectAnimator1 = ObjectAnimator.ofFloat(shadeView,
                "scaleX", 1.0f, 0.3f);
        AnimatorSet animatorSet = new AnimatorSet();
        animatorSet.playTogether(objectAnimator1, objectAnimator);
        //设置速度插值器
        animatorSet.setInterpolator(new AccelerateInterpolator());
        animatorSet.setDuration(Animation_Duration);
        animatorSet.start();
        objectAnimator.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                super.onAnimationEnd(animation);
                //当 animatorset 动画完成的时候调用
                //开始上去
                switch (mCurrentShape)
                {
                    case SHAPE_RECTANGLE:
                        mCurrentShape = Shape.SHAPE_CIRCLE;
                        break;
                    case SHAPE_CIRCLE:
                        mCurrentShape = Shape.SHAPE_TRIANGLE;
                        break;
                    case SHAPE_TRIANGLE:
                        mCurrentShape = Shape.SHAPE_RECTANGLE ;
                        break;
                }
                floatView.setCurrentShape(mCurrentShape);
                startUpAnimation();


            }
        });

    }

    private void startUpAnimation() {

        //开始上升
        ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(floatView,
                "translationY",
                ScreenUtils.dip2px(mContext, -40));
        ObjectAnimator objectAnimator1 = ObjectAnimator.ofFloat(shadeView,
                "scaleX", 0.3f,1.0f);
        AnimatorSet animatorSet = new AnimatorSet();
        animatorSet.playTogether(objectAnimator1, objectAnimator);
        //设置速度插值器
        animatorSet.setInterpolator(new DecelerateInterpolator());
        animatorSet.setDuration(Animation_Duration);
        animatorSet.start();
        animatorSet.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                super.onAnimationEnd(animation);
                startDownAnimation();
                switch (mCurrentShape)
                {
                    case SHAPE_RECTANGLE:
                        ObjectAnimator animator = ObjectAnimator.ofFloat(floatView,"rotation",-360,0);
                        animator.setDuration(Animation_Duration);
                        animator.start();
                        break;
                    case SHAPE_CIRCLE:

                    case SHAPE_TRIANGLE:
                        ObjectAnimator animator1 = ObjectAnimator.ofFloat(floatView,"rotation",0,360);
                        animator1.setDuration(Animation_Duration);
                        animator1.start();
                        break;
                }

            }
        });
    }

    /**
     * 解决内存优化问题
     */
    @Override
    public void setVisibility(int visibility) {
        super.setVisibility(visibility);

        if(visibility == GONE){
            // 隐藏   清除动画
            floatView.clearAnimation();
            shadeView.clearAnimation();

            // 删除这个View  用代码 删除
            ViewGroup parent = (ViewGroup) this.getParent();
            if(parent != null){
                parent.removeView(this);
            }
        }
    }
}

布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center">

    <jftclient.shuhui.com.a58.FloatView
        android:id="@+id/floatView"
        android:layout_width="30dp"
        android:layout_height="30dp" />

    <ImageView
        android:layout_marginTop="40dp"
        android:id="@+id/shadeView"
        android:layout_width="25sp"
        android:layout_height="5sp"
        android:background="@drawable/foot_shade"
        />

    <TextView
        android:layout_marginTop="5dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="12sp"
        android:text="玩命加载中..."/>

</LinearLayout>

分析：为什么要继承Linnearlayout ？
首先动画中有三个控件最上面的是一个imageview 中间的也是一个imageview，最下面是一个textview ，上下结构最好继承linearLayout ，也可以继承RelativeLayout ，但是效果都是一样的

第二步：自定义上方不断改变的图片

package jftclient.shuhui.com.a58;

import android.animation.ObjectAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;

/**
 * Created by 梁想想 on 2018/3/27.
 */

public class FloatView extends View {

    private  Context mContext ;
    private Paint mPaint ;
    private int height;
    private int width;
    private Loadding.Shape mCurrentShape = Loadding.Shape.SHAPE_CIRCLE ;

    public FloatView(Context context) {
        this(context,null);
    }

    public FloatView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs,0);
    }

    public FloatView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mContext = context ;
        mPaint = new Paint();
        mPaint.setColor(Color.RED);
        mPaint.setDither(true);
        mPaint.setAntiAlias(true);

    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        height = getMeasuredHeight();
        width = getMeasuredWidth();

    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        switch (mCurrentShape)
        {
            case SHAPE_RECTANGLE:  //矩形 画圆
                mPaint.setColor(Color.RED);
                canvas.drawCircle(width / 2 ,height / 2 ,width / 2 ,mPaint);
                break;

            case SHAPE_CIRCLE:   //圆型
                mPaint.setColor(Color.BLUE);
                Path path = new Path();
                path.moveTo(width /2 ,0 );
                path.lineTo(0, (float) Math.sqrt(3) / 2 * width );
                path.lineTo(width, (float) Math.sqrt(3) / 2 * width );
                path.close();
                canvas.drawPath(path,mPaint);
                break;
            case SHAPE_TRIANGLE: //三角形
                mPaint.setColor(Color.GREEN);
               canvas.drawRect(0,0,width,height,mPaint);
                break;

                default:
                    break;
        }

    }

    public   void setCurrentShape(Loadding.Shape mCurrentShape){

        this.mCurrentShape = mCurrentShape ;
        invalidate();
    }



}


 解析： 这个就是根据不同的形状状态去不断使用canvas画不同的形状 。没有什么技术可言

**第三步：在 布局中使用**


<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="jftclient.shuhui.com.a58.MainActivity"

    <jftclient.shuhui.com.a58.Loadding
        android:id="@+id/loaddingView"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </jftclient.shuhui.com.a58.Loadding>
</RelativeLayout>

其实自定义view 挺简单的，只需要搞懂逻辑就可以了。

前言

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