本文實例為大家分享了android自定義帶箭頭對話框的具體代碼，供大家參考，具體內容如下

import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Path;import android.support.annotation.Nullable;import android.util.AttributeSet;import android.view.Gravity; import com.sankuai.shangou.stone.util.DensityUtil;import com.sankuai.waimai.store.search.R; /** * Created by Android Studio. User: liangyongyao Date: 2021/3/7 Des: 帶倒三角的氣泡 */public class BubbleArrowTextView extends android.support.v7.widget.AppCompatTextView { private final static int TRIANGLE_DIRECTION_TOP = 1; private final static int TRIANGLE_DIRECTION_BOTTOM = 2; private final static int TRIANGLE_DIRECTION_LEFT = 1; private final static int TRIANGLE_DIRECTION_RIGHT = 2; private Paint mPaint; private Paint mStrokePaint; private int mBgColor; private int mStrokeColor; private int mStrokeWidth; private int mTotalHeight; private int mTotalWidth; private int mLabelHeight; private int mTriangleHeight; private int mTriangleWidth; private int mRadius; private int triangleDirection; public BubbleArrowTextView(Context context) { this(context, null); } public BubbleArrowTextView(Context context, @Nullable AttributeSet attrs) { this(context, attrs, 0); } public BubbleArrowTextView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(context, attrs, defStyleAttr); } public void init(Context context, AttributeSet attrs, int defStyleAttr) { if (attrs != null) { TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.BubbleArrowTextView); mBgColor = a.getColor(R.styleable.BubbleArrowTextView_bubbleColor, 0); mStrokeColor = a.getColor(R.styleable.BubbleArrowTextView_bubbleStrokeColor, 0); mRadius = a.getDimensionPixelOffset(R.styleable.BubbleArrowTextView_bubbleRadius, 0); mStrokeWidth = a.getDimensionPixelOffset(R.styleable.BubbleArrowTextView_bubbleStrokeWidth, 0); mTriangleHeight = a.getDimensionPixelOffset(R.styleable.BubbleArrowTextView_triangleHeight, DensityUtil.dip2px(context, 6)); mTriangleWidth = a.getDimensionPixelOffset(R.styleable.BubbleArrowTextView_triangleWidth, DensityUtil.dip2px(context, 3.5f)); triangleDirection = a.getInt(R.styleable.BubbleArrowTextView_triangleDirection, 0); a.recycle(); } setGravity(Gravity.CENTER); initPaint(); } //初始化畫筆 public void initPaint() { mPaint = new Paint(); mPaint.setAntiAlias(true); mPaint.setStyle(Paint.Style.FILL); mPaint.setTextSize(getPaint().getTextSize()); mPaint.setDither(true); } //初始化邊框線畫筆 public void initStrokePaint() { mStrokePaint = new Paint(); mStrokePaint.setAntiAlias(true); mStrokePaint.setStyle(Paint.Style.FILL); mStrokePaint.setDither(true); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); mLabelHeight = getFontHeight() + getPaddingTop() + getPaddingBottom(); mTotalHeight = mLabelHeight + mTriangleHeight * 2 + mStrokeWidth * 2; mTotalWidth = getPaddingLeft() + getFontWidth() + getPaddingRight() + mStrokeWidth * 2; setMeasuredDimension(mTotalWidth, mTotalHeight); } @Override protected void onDraw(Canvas canvas) { drawView(canvas); super.onDraw(canvas); } //繪制氣泡 private void drawView(Canvas canvas) { if (mStrokeColor != 0 && mStrokeWidth != 0) { initStrokePaint(); mStrokePaint.setColor(mStrokeColor); drawRound(canvas, mStrokePaint, 0); drawTriangle(canvas, mStrokePaint, 0); } if (mBgColor != 0) { mPaint.setColor(mBgColor); drawRound(canvas, mPaint, mStrokeWidth); drawTriangle(canvas, mPaint, mStrokeWidth); } } //繪制矩形 private void drawRound(Canvas canvas, Paint paint, int strokeWidth) { canvas.drawRoundRect(strokeWidth, mTriangleHeight + strokeWidth, mTotalWidth - strokeWidth, mTotalHeight - mTriangleHeight - strokeWidth, mRadius, mRadius, paint); } //繪制三角形 private void drawTriangle(Canvas canvas, Paint paint, int strokeWidth) { Path path = new Path(); switch (triangleDirection) { //上 case TRIANGLE_DIRECTION_TOP: path.moveTo(mTotalWidth * 0.8f - mTriangleWidth / 2 + strokeWidth / 2, mTriangleHeight + strokeWidth); path.lineTo(mTotalWidth * 0.8f, strokeWidth + strokeWidth / 2); path.lineTo(mTotalWidth * 0.8f + mTriangleWidth / 2 - strokeWidth / 2, mTriangleHeight + strokeWidth); break; //下 case TRIANGLE_DIRECTION_BOTTOM: path.moveTo(mTotalWidth * 0.8f - mTriangleWidth/2 + strokeWidth / 2, mTotalHeight - mTriangleHeight - strokeWidth); path.lineTo(mTotalWidth * 0.8f, mTotalHeight - strokeWidth - strokeWidth / 2); path.lineTo(mTotalWidth * 0.8f + mTriangleWidth/2 - strokeWidth / 2, mTotalHeight - mTriangleHeight - strokeWidth); break; default: return; } canvas.drawPath(path, paint); } //根據字號求字體高度 private int getFontHeight() { Paint.FontMetrics fontMetrics = mPaint.getFontMetrics(); return Math.round(fontMetrics.descent - fontMetrics.ascent); } //根據字號求字體寬度 private int getFontWidth() { return (int) mPaint.measureText(getText().toString()); }}

xml：

<declare-styleable name='BubbleArrowTextView'> <attr name='bubbleColor' format='reference|color' /> <attr name='bubbleStrokeColor' format='reference|color' /> <attr name='bubbleStrokeWidth' format='dimension' /> <attr name='triangleHeight' format='dimension' /> <attr name='triangleWidth' format='dimension' /> <attr name='bubbleRadius' format='dimension' /> <attr name='triangleDirection'> <flag name='top' value='1' /> <flag name='bottom' value='2' /> </attr></declare-styleable>

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持好吧啦網。