Android 在 google pay 中绘制自定义视图
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【中文标题】Android 在 google pay 中绘制自定义视图【英文标题】:Android Draw the custom view as in google pay 【发布时间】:2019-05-16 09:51:38 【问题描述】:这个问题已经被问过并且答案已经被接受here 但接受的答案不是我想要的。我想使用一个自定义视图,其中槽口采用宽度+它正在遍历的视图的一些边距,如上图中的支付图标。在查看底部应用程序栏时,里面有一个像 this 这样的工厂 我看到了一个名为edge treatment class 的类,我想它也可以使用。我现在没有发布我的 customview 代码,因为我只能画一个矩形。
【问题讨论】:
【参考方案1】:您需要使用Cubic Bézier Curve
绘制曲线。 Bartosz Ciechanowski 写了一篇了解如何绘制此类曲线的好文章,here。
我开发了一个View
来绘制类似于 google pay 的形状,它继承自 FrameLayout
。源代码可在its github repository 上获得(但尚未记录!)。但是,将以下行添加到您的应用级别 build.gradle
文件中:
repositories
jcenter()
dependencies
implementation 'com.aminography:beziercurvebulgelayout:1.0.2'
然后你可以在xml
布局文件中使用它,如下:
<com.aminography.view.BezierCurveBulgeLayout
android:id="@+id/bulgeLayout"
android:layout_
android:layout_
app:bulgeType="bulge"
app:bulgeColor="@color/colorPrimary"
app:curveWidth="32dp"
app:flatWidth="56dp"
app:flatHeight="24dp">
<android.support.v7.widget.AppCompatImageView
android:layout_
android:layout_
android:layout_gravity="center"
android:src="@android:drawable/ic_menu_compass"/>
</com.aminography.view.BezierCurveBulgeLayout>
.
它的形状和颜色是可定制的,通过改变以下属性来实现目标形状:
【讨论】:
对不起@aminography 我错误地接受了另一个答案。请稍等一下,我有一个老问题,一旦我可以提高赏金,我会在那里给你你的代表。现在我似乎处于某种类型的冷却时间。顺便说一句,你做教程吗??? 嘿@aminography 您是否愿意在另一个问题上获得赏金,只需给出一个合理的答案***.com/questions/49584981/weakhandler-memory-leak【参考方案2】:除了@aminography的上述答案
如果有人在这里寻找 java 中的答案是 JAVA 中的工作代码
BezierCurveBulgeLayout
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.*;
import android.os.Build;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.annotation.RequiresApi;
import android.util.AttributeSet;
import android.widget.FrameLayout;
public class BezierCurveBulgeLayout extends FrameLayout
AttributeSet attrs;
int defStyleAttr = 0;
int defStyleRes = 0;
private int curveWidth;
private int flatWidth;
private int flatHeight;
private int bulgeColor;
private BulgeType bulgeType;
private Path path = new Path();
private Paint paint = new Paint();
private Point startCurveStartPoint = new Point();
private Point startCurveEndPoint = new Point();
private Point startCurveFirstControlPoint = new Point();
private Point startCurveSecondControlPoint = new Point();
private Point endCurveStartPoint = new Point();
private Point endCurveEndPoint = new Point();
private Point endCurveFirstControlPoint = new Point();
private Point endCurveSecondControlPoint = new Point();
public BezierCurveBulgeLayout(@NonNull Context context)
super(context);
init();
public BezierCurveBulgeLayout(@NonNull Context context, @Nullable AttributeSet attrs)
super(context, attrs);
this.attrs = attrs;
init();
public BezierCurveBulgeLayout(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr)
super(context, attrs, defStyleAttr);
this.attrs = attrs;
this.defStyleAttr = defStyleAttr;
init();
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
public BezierCurveBulgeLayout(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes)
super(context, attrs, defStyleAttr, defStyleRes);
this.attrs = attrs;
this.defStyleAttr = defStyleAttr;
this.defStyleRes = defStyleRes;
init();
private void init()
TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.BezierCurveBulgeLayout, defStyleAttr, defStyleRes);
curveWidth = a.getDimensionPixelSize(R.styleable.BezierCurveBulgeLayout_curveWidth, 0);
flatWidth = a.getDimensionPixelSize(R.styleable.BezierCurveBulgeLayout_flatWidth, 0);
flatHeight = a.getDimensionPixelSize(R.styleable.BezierCurveBulgeLayout_flatHeight, 0);
bulgeType = BulgeType.values()[a.getInt(R.styleable.BezierCurveBulgeLayout_bulgeType, BulgeType.BULGE.ordinal())];
bulgeColor = a.getColor(R.styleable.BezierCurveBulgeLayout_bulgeColor, Color.WHITE);
a.recycle();
paint.setStyle(Paint.Style.FILL_AND_STROKE);
paint.setColor(bulgeColor);
setBackgroundColor(Color.TRANSPARENT);
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom)
super.onLayout(changed, left, top, right, bottom);
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh)
super.onSizeChanged(w, h, oldw, oldh);
int viewWidth = getWidth();
int viewHeight = getHeight();
int baseY = 0;
int flatY = 0;
if (bulgeType == BulgeType.BULGE) baseY = flatHeight;
else flatY = flatHeight;
startCurveStartPoint.set(viewWidth / 2 - flatWidth / 2 - curveWidth * 7 / 6, baseY);
startCurveEndPoint.set(viewWidth / 2 - flatWidth / 2, flatY);
endCurveStartPoint.set(viewWidth / 2 + flatWidth / 2, flatY);
endCurveEndPoint.set(viewWidth / 2 + flatWidth / 2 + curveWidth * 7 / 6, baseY);
startCurveFirstControlPoint.set(startCurveStartPoint.x + curveWidth * 5 / 8, startCurveStartPoint.y);
startCurveSecondControlPoint.set(startCurveEndPoint.x - curveWidth / 2, startCurveEndPoint.y);
endCurveFirstControlPoint.set(endCurveStartPoint.x + curveWidth / 2, endCurveStartPoint.y);
endCurveSecondControlPoint.set(endCurveEndPoint.x - curveWidth * 5 / 8, endCurveEndPoint.y);
path.reset();
path.moveTo(0f, baseY);
path.lineTo((float) startCurveStartPoint.x, (float) startCurveStartPoint.y);
path.cubicTo(
(float) startCurveFirstControlPoint.x, (float) startCurveFirstControlPoint.y,
(float) startCurveSecondControlPoint.x, (float) startCurveSecondControlPoint.y,
(float) startCurveEndPoint.x, (float) startCurveEndPoint.y
);
path.lineTo((float) endCurveStartPoint.x, (float) endCurveStartPoint.y);
path.cubicTo(
(float) endCurveFirstControlPoint.x, (float) endCurveFirstControlPoint.y,
(float) endCurveSecondControlPoint.x, (float) endCurveSecondControlPoint.y,
(float) endCurveEndPoint.x, (float) endCurveEndPoint.y
);
path.lineTo((float) viewWidth, (float) baseY);
path.lineTo((float) viewWidth, (float) viewHeight);
path.lineTo(0f, (float) viewHeight);
path.close();
@Override
protected void onDraw(Canvas canvas)
super.onDraw(canvas);
canvas.drawPath(path, paint);
public enum BulgeType
BULGE,
NOTCH
attrs.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="BezierCurveBulgeLayout">
<attr name="curveWidth" format="dimension"/>
<attr name="flatWidth" format="dimension"/>
<attr name="flatHeight" format="dimension"/>
<attr name="bulgeColor" format="color"/>
<attr name="bulgeType" format="enum">
<enum name="bulge" value="0"/>
<enum name="notch" value="1"/>
</attr>
</declare-styleable>
</resources>
现在在你的 layout.xml 文件中像这样使用
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_
android:layout_
android:background="#00fff7"
android:gravity="center"
tools:context=".MainActivity">
<neel.com.demo.BezierCurveBulgeLayout
android:id="@+id/bulgeLayout"
android:layout_
android:layout_
app:bulgeColor="@color/colorPrimary"
app:bulgeType="bulge"
app:curveWidth="32dp"
app:flatHeight="20dp"
app:flatWidth="80dp">
<ImageView
android:layout_
android:layout_
android:layout_gravity="center"
android:src="@drawable/ic_fav" />
</neel.com.demo.BezierCurveBulgeLayout>
</LinearLayout>
输出
【讨论】:
谢谢老兄 :) 我用 kotlin 写了这个库,可能有人在 java 中需要它。 @aminography 是的,谢谢,所有的功劳都归功于你;这就是为什么我添加了In addition of above answer of @aminography
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