Android自定義VIew實現(xiàn)衛(wèi)星菜單效果淺析
一 概述:
最近一直致力于Android自定義VIew的學(xué)習(xí),主要在看《android群英傳》,還有CSDN博客鴻洋大神和wing大神的一些文章,寫的很詳細(xì),自己心血來潮,學(xué)著寫了個實現(xiàn)了類似衛(wèi)星效果的一個自定義的View,分享到博客上,望各位指點(diǎn)一二。寫的比較粗糙,見諒。(因為是在Linux系統(tǒng)下寫的,效果圖我直接用手機(jī)拍的,難看,大家講究下就看個效果,勿噴)。
先來看個效果圖,有點(diǎn)不忍直視:
自定義VIew準(zhǔn)備:
(1)創(chuàng)建繼承自View的類;
(2)重寫構(gòu)造函數(shù);
(3)定義屬性。
(4)重寫onMeasure(),onLayout()方法。
好了,廢話不說了,準(zhǔn)備上菜。
二 相關(guān)實現(xiàn)
首先是自定義的View,重寫構(gòu)造函數(shù),我這里是直接繼承的VIewGroup,貼上代碼:
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); }
這里需要讀取自定義的屬性,所以調(diào)用含三個參數(shù)的構(gòu)造函數(shù)。
自定義的屬性,我這里知定義了兩個,一個是菜單弧形的半徑,還有個是菜單在屏幕的位置,這里可以設(shè)置在左上角,左下角,右上角,右下角。代碼如下:
<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="MoonAttrs"> <attr name="mRadius" format="integer"></attr><!--菜單圓形半徑--> <attr name="mPosition"><!--衛(wèi)星菜單屏幕所在位置--> <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義的View,配置屬性:
<?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>
最后我們需要在自定義的View類中的構(gòu)造函數(shù)里,獲取相關(guān)的屬性值:
public MoonView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); //獲取相關(guān)屬性 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); }
做完以上的準(zhǔn)備工作,我們就可以對組件進(jìn)行測量,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獲取按鈕的數(shù)量,有一個是中心點(diǎn),不參與計算,angle是每個按鈕離基準(zhǔn)線的角度,這里以90度為準(zhǔn),固定在這個范圍里面均勻分配。
首先先把中心點(diǎn)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的值看屬性就明白了,對中心點(diǎn)進(jìn)行固定位置。并且注冊點(diǎn)擊事件。
現(xiàn)在開始給剩下的按鈕布局,并隱藏按鈕:
@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); } } }
現(xiàn)在我們實現(xiàn)點(diǎn)擊事件:
@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; } }
設(shè)置點(diǎn)擊顯示以及隱藏,并且?guī)эh動的動畫效果。
四個角落效果如下:
以上所述是小編給大家介紹的Android自定義VIew實現(xiàn)衛(wèi)星菜單效果淺析,希望對大家有所幫助,如果大家有任何疑問請給我留言,小編會及時回復(fù)大家的。在此也非常感謝大家對腳本之家網(wǎng)站的支持!
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