Android自定义VIew之实现卫星菜单效果

一概述：

最近一直致力于android自定义VIew的学习，主要在看《android群英传》，还有CSDN博客鸿洋大神和wing大神的一些文章，写的很详细，自己心血来潮，学着写了个实现了类似卫星效果的一个自定义的View，分享到博客上，望各位指点一二。写的比较粗糙，见谅。（因为是在linux系统下写的，效果图我直接用手机拍的，难看，大家讲究下就看个效果，勿喷）。

先来看个效果图，有点不忍直视：

自定义VIew准备：

（1）创建继承自View的类;

（2）重写构造函数;

（3）定义属性。

（4）重写onMeasure(),onLayout()方法。

好了，废话不说了，准备上菜。

二相关实现

首先是自定义的View，重写构造函数，我这里是直接继承的VIewGroup，贴上代码：

            public MoonView(Context context) {  
               this(context,null);  
            }  
  
            public MoonView(Context context, AttributeSet attrs) {  
               this(context, attrs,0);  
            }  
  
            public MoonView(Context context, AttributeSet attrs, int defStyleAttr) {  
              super(context, attrs, defStyleAttr);  
            }

这里需要读取自定义的属性，所以调用含三个参数的构造函数。

自定义的属性，我这里知定义了两个，一个是菜单弧形的半径，还有个是菜单在屏幕的位置，这里可以设置在左上角，左下角，右上角，右下角。代码如下：

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <declare-styleable name="MoonAttrs">
        <attr name="mRadius" format="integer"></attr><!--菜单圆形半径-->
        <attr name="mPosition"><!--卫星菜单屏幕所在位置-->
            <enum name="leftTop" value="-2"></enum><!--左上角-->
            <enum name="leftBottom" value="-1"></enum><!--左下角-->
            <enum name="rightTop" value="-3"></enum><!--右上角-->
            <enum name="rightBottom" value="-4"></enum><!--右下角-->
        </attr>
    </declare-styleable>

</resources>

然后在布局文件里面引用自定义的View，配置属性：

<?xml version="1.0" encoding="utf-8"?>
<com.example.liujibin.testmyview3.myView.MoonView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:custom="http://schemas.android.com/apk/res/com.example.liujibin.testmyview3"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    custom:mRadius="400"
    custom:mPosition="rightBottom"
    >

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@mipmap/sapi_icon_add_account"/>
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@mipmap/sapi_icon_add_account"/>
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@mipmap/sapi_icon_add_account"/>
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@mipmap/sapi_icon_add_account"/>
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@mipmap/sapi_icon_add_account"/>

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@mipmap/sapi_icon_add_account"/>


</com.example.liujibin.testmyview3.myView.MoonView>

最后我们需要在自定义的View类中的构造函数里，获取相关的属性值：

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

        //获取相关属性
        TypedArray ta = context.getTheme().obtainStyledAttributes(attrs, R.styleable.MoonAttrs,
                defStyleAttr,0);
        mRaius = ta.getInt(R.styleable.MoonAttrs_mRadius,500);
        position = ta.getInt(R.styleable.MoonAttrs_mPosition,-1);

    }

做完以上的准备工作，我们就可以对组件进行测量，布局。

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        count = getChildCount()-1;
        angle = 90/(count-1);

        int count = getChildCount();
        for(int i =0;i< count;i++){
            measureChild(getChildAt(i),widthMeasureSpec,heightMeasureSpec);
        }
    }

count获取按钮的数量，有一个是中心点，不参与计算，angle是每个按钮离基准线的角度，这里以90度为准，固定在这个范围里面均匀分配。

首先先把中心点固定好位置：

    @Override
    protected void onLayout(boolean b, int i, int i1, int i2, int i3) {
        if(isChanged){
            layoutBottom();
        }
    }

    private void layoutBottom(){
        View view = getChildAt(0);
        switch (position){
            case -1:
                btml = 0;
                btmt = getMeasuredHeight() - view.getMeasuredHeight();
                btmr = view.getMeasuredWidth();
                btmb = getMeasuredHeight();
                break;
            case -2:
                btml = 0;
                btmt = 0;
                btmr = view.getMeasuredWidth();
                btmb = view.getMeasuredHeight();
                break;
            case -3:
                btml = getMeasuredWidth() - view.getMeasuredWidth();
                btmt = 0;
                btmr = getMeasuredWidth();
                btmb = view.getMeasuredHeight();
                break;
            case -4:
                btml = getMeasuredWidth() - view.getMeasuredWidth();
                btmt = getMeasuredHeight() - view.getMeasuredHeight();
                btmr = getMeasuredWidth();
                btmb = getMeasuredHeight();
                break;
        }
        btmWidth = view.getMeasuredWidth();
        btmHeight = view.getMeasuredHeight();
        view.setOnClickListener(this);
        view.layout(btml,btmt,btmr,btmb);

    }

position的值看属性就明白了，对中心点进行固定位置。并且注册点击事件。

现在开始给剩下的按钮布局，并隐藏按钮：

    @Override
    protected void onLayout(boolean b, int i, int i1, int i2, int i3) {
        if(isChanged){
            layoutBottom();
            int count = getChildCount();
            for(int k = 0;k < count - 1;k++){
                View view = getChildAt(k+1);
                int childWidth = view.getMeasuredWidth();
                int childHeight = view.getMeasuredHeight();
                int childX = (int)(mRaius*(Math.sin(angle*(k)*Math.PI/180)));
                int childY = (int)(mRaius*(Math.cos(angle*(k)*Math.PI/180)));
                

                int left = 0;
                int top = 0;
                int right = 0;
                int bottom = 0;
                switch(position){
                    case -1:
                        left = childX+btmWidth/2-childWidth/2;
                        top =getMeasuredHeight() - (childY+childHeight/2+btmHeight/2);
                        right = childX+btmWidth/2+childWidth/2;
                        bottom =getMeasuredHeight() - (childY + btmHeight/2) + childHeight/2;
                        break;
                    case -2:
                        left = childX+btmWidth/2-childWidth/2;
                        top =childY-childHeight/2+btmHeight/2;
                        right = childX+btmWidth/2+childWidth/2;
                        bottom = childY + btmHeight/2 + childHeight/2;
                        break;
                    case -3:
                        left = getMeasuredWidth() - (childX+btmWidth/2+childWidth/2);
                        top =childY-childHeight/2+btmHeight/2;
                        right = getMeasuredWidth() - (childX+btmWidth/2+childWidth/2)+childWidth;
                        bottom = childY + btmHeight/2 + childHeight/2;
                        break;
                    case -4:
                        left = getMeasuredWidth() - (childX+btmWidth/2+childWidth/2);
                        top =getMeasuredHeight() - (childY+childHeight/2+btmHeight/2);
                        right = getMeasuredWidth() - (childX+btmWidth/2+childWidth/2)+childWidth;
                        bottom =getMeasuredHeight() - (childY + btmHeight/2) + childHeight/2;
                        break;
                }
                view.layout(left,top,right,bottom);
                view.setVisibility(View.GONE);
            }

        }
    }

现在我们实现点击事件：

    @Override
    public void onClick(View view) {
        if(isChanged){
            int count = getChildCount();
            for(int i = 0;i < count - 1;i++){
                View childView = getChildAt(i+1);
                int childX = (int)(mRaius*(Math.sin(angle*(i)*Math.PI/180)));
                int childY = (int)(mRaius*(Math.cos(angle*(i)*Math.PI/180)));
                int childWidth = view.getMeasuredWidth();
                int childHeight = view.getMeasuredHeight();
                int left = 0;
                int top = 0;
                TranslateAnimation ta = null;
                switch(position){
                    case -1:
                        left = childX+btmWidth/2-childWidth/2;
                        top =getMeasuredHeight() - (childY+childHeight/2+btmHeight/2);
                        ta = new TranslateAnimation(-(left+childView.getMeasuredWidth()),0,getMeasuredHeight()-top,0);
                        break;
                    case -2:
                        left = childX+btmWidth/2-childWidth/2;
                        top =childY-childHeight/2+btmHeight/2;
                        ta = new TranslateAnimation(-(left+childView.getMeasuredWidth()),0,-top,0);
                        break;
                    case -3:
                        left = getMeasuredWidth() - (childX+btmWidth/2+childWidth/2);
                        top =childY-childHeight/2+btmHeight/2;
                        ta = new TranslateAnimation(getMeasuredWidth()-(left+childView.getMeasuredWidth()),0,-top,0);
                        break;
                    case -4:
                        left = getMeasuredWidth() - (childX+btmWidth/2+childWidth/2);
                        top =getMeasuredHeight() - (childY+childHeight/2+btmHeight/2);
                        ta = new TranslateAnimation(getMeasuredWidth()-(left+childView.getMeasuredWidth()),0,getMeasuredHeight()-top,0);
                        break;
                }

                ta.setDuration(500);
                childView.setAnimation(ta);
                childView.setVisibility(View.VISIBLE);
            }
            isChanged = false;
        }else{
            int count = getChildCount();
            for(int i = 0;i < count - 1;i++){
                View childView = getChildAt(i+1);
                int childX = (int)(mRaius*(Math.sin(angle*(i)*Math.PI/180)));
                int childY = (int)(mRaius*(Math.cos(angle*(i)*Math.PI/180)));
                int childWidth = view.getMeasuredWidth();
                int childHeight = view.getMeasuredHeight();
                int left = 0;
                int top = 0;
                TranslateAnimation ta = null;
                switch(position){
                    case -1:
                        left = childX+btmWidth/2-childWidth/2;
                        top =getMeasuredHeight() - (childY+childHeight/2+btmHeight/2);
                        ta = new TranslateAnimation(0,-(left+childView.getMeasuredWidth()),0,getMeasuredHeight()-top);
                        break;
                    case -2:
                        left = childX+btmWidth/2-childWidth/2;
                        top =childY-childHeight/2+btmHeight/2;
                        ta = new TranslateAnimation(0,-(left+childView.getMeasuredWidth()),0,-top);
                        break;
                    case -3:
                        left = getMeasuredWidth() - (childX+btmWidth/2+childWidth/2);
                        top =childY-childHeight/2+btmHeight/2;
                        ta = new TranslateAnimation(0,getMeasuredWidth()-(left+childView.getMeasuredWidth()),0,-top);
                        break;
                    case -4:
                        left = getMeasuredWidth() - (childX+btmWidth/2+childWidth/2);
                        top =getMeasuredHeight() - (childY+childHeight/2+btmHeight/2);
                        ta = new TranslateAnimation(0,getMeasuredWidth()-(left+childView.getMeasuredWidth()),0,getMeasuredHeight()-top);
                        break;
                }

                ta.setDuration(500);
                childView.setAnimation(ta);
                childView.setVisibility(View.GONE);
            }
            isChanged = true;
        }
    }

设置点击显示以及隐藏，并且带飘动的动画效果。

四个角落效果如下：

源码下载地址：http://download.csdn.net/detail/liujibin1836591303/9675863

Android自定义VIew之实现卫星菜单效果

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