Android怎样实现左上角倾斜的标签效果

这篇文章主要介绍Android怎样实现左上角倾斜的标签效果，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

实现的思路大致如下图：

主页面的布局结构如下：

绘制倾斜标签的代码如下：

package com.zc.labeldemo;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Path;import android.util.AttributeSet;import android.view.View;import androidx.annotation.Nullable;/** * @author wenchao * @version 1.0.1 * @className LabelView * @date 2019/9/20 * @description */public class LabelView extends View {  /**   * 画笔   */  private Paint paint;  /**   * Path   */  private Path path;  /**   * View宽度   */  private float width;  /**   * View高度   */  private float height;  /**   * 标签背景宽度   */  private float labelWidth;  /**   * 标签折叠区域宽度   */  private float pointWidth;  /**   * 标签折叠区域高度   */  private float pointHeight;  /**   * 标签背景颜色   */  private int labelColor;  /**   * 标签折叠区域背景颜色   */  private int pointColor;  /**   * 中心点x坐标   */  private float centerX;  /**   * 中心点y坐标   */  private float centerY;  /**   * 标签文字内容   */  private String text;  /**   * 标签文字颜色   */  private int textColor;  public LabelView(Context context) {    super(context);  }  public LabelView(Context context, @Nullable AttributeSet attrs) {    super(context, attrs);    init();  }  private void init() {    labelWidth = 120;    pointWidth = 10;    pointHeight = 17;    paint = new Paint();    path = new Path();    paint.setAntiAlias(true);    paint.setStrokeWidth(10);    setBackgroundColor(Color.TRANSPARENT);    labelColor = Color.parseColor("#EA6724");    pointColor = Color.parseColor("#C43200");    text = "测试内容";    textColor = Color.WHITE;  }  @Override  protected void onSizeChanged(int w, int h, int oldw, int oldh) {    super.onSizeChanged(w, h, oldw, oldh);    width = w;    height = h;    centerX = w/2;    centerY = h/2;  }  @Override  public void draw(Canvas canvas) {    super.draw(canvas);    //画标签区域背景上边的折叠区域（小三角区域）    path.reset();    path.moveTo(width-pointWidth,0);    path.lineTo(width,pointHeight);    path.lineTo(width-pointWidth-26,pointHeight);    path.close();    paint.setColor(pointColor);    canvas.drawPath(path,paint);    //画标签背景区域下边的折叠区域    path.reset();    path.moveTo(0,height-pointWidth);    path.lineTo(pointHeight,height);    path.lineTo(pointHeight,height-pointWidth-26);    path.close();    paint.setColor(pointColor);    canvas.drawPath(path,paint);    //画标签背景区域    path.reset();    paint.setColor(labelColor);    paint.setStyle(Paint.Style.FILL);    path.moveTo(width-labelWidth-pointWidth,0);    path.lineTo(width-pointWidth,0);    path.lineTo(0,height-pointWidth);    path.lineTo(0,height-labelWidth-pointWidth);    canvas.drawPath(path,paint);    //画文字 逆时针选择45度    canvas.rotate(-45,centerX,centerY);    //文字中心点横坐标    float textX = width / 2;    //文字中心点纵坐标    float textY = (height-pointWidth-(labelWidth / 2f)) / 2f;    paint.setColor(textColor);    paint.setStyle(Paint.Style.FILL);    paint.setTextSize(38);    //设置文字居中绘制    paint.setTextAlign(Paint.Align.CENTER);    canvas.drawText(text,textX,textY,paint);  }}

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