在開發(fā)過程中，我們可能會經(jīng)常遇到這樣的需求樣式：

這張圖是截取京東消息通知的彈出框，我們可以看到右上方有個(gè)三角形的氣泡效果，這只是其中一種，三角形的方向還可以是上、下、左、右。

通過截圖可以發(fā)現(xiàn)，氣泡由正三角形和圓角長方形組成，于是可以通過組合來形成三角形氣泡的效果，下面我們通過三種方式進(jìn)行實(shí)現(xiàn)。

實(shí)現(xiàn)方式：

1、通過.9圖進(jìn)行實(shí)現(xiàn)；2、通過shape方式實(shí)現(xiàn)；3、通過自定義view的方式實(shí)現(xiàn)；

1、通過.9圖進(jìn)行實(shí)現(xiàn)

這種方式就不用說了吧，找你們UI小姐姐切一個(gè).9圖，使用即可，不過這種方式的圖片需要占一定體積哦。

2、通過shape方式實(shí)現(xiàn)

正三角形

<?xml version='1.0' encoding='utf-8'?><layer-list xmlns:android='http://schemas.android.com/apk/res/android'> <item> <rotate android:fromDegrees='45' android:pivotX='-40%' android:pivotY='80%'> <shape android:shape='rectangle'><size android: android: /><solid android:color='#ffffff' /> </shape> </rotate> </item></layer-list>

倒三角形

<?xml version='1.0' encoding='utf-8'?><layer-list xmlns:android='http://schemas.android.com/apk/res/android'> <item> <rotate android:fromDegrees='45' android:pivotX='135%' android:pivotY='15%'> <shape android:shape='rectangle'><size android: android: /><solid android:color='#ffffff' /> </shape> </rotate> </item></layer-list>

左三角形

<?xml version='1.0' encoding='utf-8'?><layer-list xmlns:android='http://schemas.android.com/apk/res/android'> <item> <rotate android:fromDegrees='-45' android:pivotX='85%' android:pivotY='-35%'>> <shape android:shape='rectangle'><size android: android: /><solid android:color='#ffffff' /> </shape> </rotate> </item></layer-list>

右三角形

<?xml version='1.0' encoding='utf-8'?><layer-list xmlns:android='http://schemas.android.com/apk/res/android'> <item> <rotate android:fromDegrees='-45' android:pivotX='15%' android:pivotY='135%'>> <shape android:shape='rectangle'><size android: android: /><solid android:color='#ffffff' /> </shape> </rotate> </item></layer-list>

上面就是通過shape方式實(shí)現(xiàn)各個(gè)方向的代碼，這種方式缺點(diǎn)比較明顯，如果要變化不同的角的位置需要再寫不同的布局。

3、通過自定義view的方式實(shí)現(xiàn)

由于是比較簡單這里就不講解每個(gè)怎么搞了，可以復(fù)制過去直接用

添加自定義屬性

<declare-styleable name='TriangleView'> <attr name='trv_color' format='color' /> <attr name='trv_direction'> <enum name='top' value='0' /> <enum name='bottom' value='1' /> <enum name='right' value='2' /> <enum name='left' value='3' /> </attr> </declare-styleable>

自定義代碼文件

public class TriangleView extends View { private static final int TOP = 0; private static final int BOTTOM = 1; private static final int RIGHT = 2; private static final int LEFT = 3; private static final int DEFUALT_WIDTH = 10; private static final int DEFUALT_HEIGHT = 6; private static final int DEFUALT_COLOR = R.color.FFF; private Paint mPaint; private int mColor; private int mWidth; private int mHeight; private int mDirection; private Path mPath; public TriangleView(final Context context) { this(context, null); } public TriangleView(Context context, @Nullable AttributeSet attrs) { this(context, attrs, 0); } public TriangleView(final Context context, final AttributeSet attrs, final int defStyleAttr) { super(context, attrs, defStyleAttr); init(); TypedArray typedArray = context.getTheme().obtainStyledAttributes(attrs, R.styleable.TriangleView, 0, 0); mColor = typedArray.getColor(R.styleable.TriangleView_trv_color, ContextCompat.getColor(getContext(), DEFUALT_COLOR)); mDirection = typedArray.getInt(R.styleable.TriangleView_trv_direction, mDirection); typedArray.recycle(); mPaint.setColor(mColor); } private void init() { mPaint = new Paint(); mPaint.setAntiAlias(true); mPaint.setStyle(Paint.Style.FILL); mPath = new Path(); mDirection = TOP; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); mWidth = MeasureSpec.getSize(widthMeasureSpec); mHeight = MeasureSpec.getSize(heightMeasureSpec); final int widthMode = MeasureSpec.getMode(widthMeasureSpec); final int heightMode = MeasureSpec.getMode(heightMeasureSpec); if (mWidth == 0 || widthMode != MeasureSpec.EXACTLY) { mWidth = (int) PixelUtil.dp2px(DEFUALT_WIDTH); } if (mHeight == 0 || heightMode != MeasureSpec.EXACTLY) { mHeight = (int) PixelUtil.dp2px(DEFUALT_HEIGHT); } setMeasuredDimension(mWidth, mHeight); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); switch (mDirection) { case TOP:mPath.moveTo(0, mHeight);mPath.lineTo(mWidth, mHeight);mPath.lineTo(mWidth / 2, 0);break; case BOTTOM:mPath.moveTo(0, 0);mPath.lineTo(mWidth / 2, mHeight);mPath.lineTo(mWidth, 0);break; case RIGHT:mPath.moveTo(0, 0);mPath.lineTo(0, mHeight);mPath.lineTo(mWidth, mHeight / 2);break; case LEFT:mPath.moveTo(0, mHeight / 2);mPath.lineTo(mWidth, mHeight);mPath.lineTo(mWidth, 0);break; default:break; } mPath.close(); canvas.drawPath(mPath, mPaint); }}

布局文件添加

<com.sjl.keeplive.triange.TriangleView android:layout_width='10dp' android:layout_height='6dp' app:trv_color='@color/FFF' app:trv_direction='top' />

通過自定義的方式可以搞定四個(gè)方向，而且在代碼中也可以使用，動態(tài)添加，動態(tài)改變顏色，還是比較好的方式。

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