Android 如何以编程方式创建三角形和矩形？
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Android how to create triangle and rectangle shape programmatically?
提问by Dory
How can we create ballon drawable shape as below. where we can change the color of it dynamically.
我们如何创建气球可绘制形状，如下所示。我们可以动态改变它的颜色。
回答by Sanket Kachhela
Here it is XMLfor triangleand rectangle. save it inside drawable folder.
这是XML为了triangle和rectangle。将其保存在 drawable 文件夹中。
triangle.xml
三角形.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item >
<rotate
android:fromDegrees="45"
android:toDegrees="45"
android:pivotX="-40%"
android:pivotY="87%" >
<shape
android:shape="rectangle" >
<stroke android:color="@android:color/transparent" android:width="10dp"/>
<solid
android:color="#000000" />
</shape>
</rotate>
</item>
</layer-list>
rectangle.xml
矩形文件
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item>
<shape android:shape="rectangle">
<solid android:color="#B2E3FA" />
</shape>
</item>
</layer-list>
and layoutfor shape you require.
和您需要的形状布局。
<RelativeLayout
android:id="@+id/rlv1"
android:layout_width="150dp"
android:layout_height="50dp"
android:background="@drawable/rectangle" />
<RelativeLayout
android:id="@+id/rlv2"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_below="@+id/rlv1"
android:background="@drawable/triangle"
android:rotation="180" />
set margin according you required.
根据您的需要设置保证金。
回答by Phan Van Linh
If you want a border for your layout
如果您想要布局的边框
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/linear_root"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<TextView
android:id="@+id/text_message"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:background="@drawable/bg_rectangle"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_marginTop="20dp"
android:padding="8dp"
android:text="Abc"
/>
<ImageView
android:id="@+id/image_arrow"
android:layout_marginTop="-1.5dp"
android:layout_width="16dp"
android:layout_height="16dp"
android:layout_gravity="center_horizontal"
android:background="@drawable/icon_arrow_down"
/>
</LinearLayout>
bg_rectangle
bg_rectangle
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="#eaeaea" />
<stroke
android:width="1dp"
android:color="#f00" />
<corners android:radius="8dp" />
</shape>
icon_arrow_down, or you can create triangle by vector like here
icon_arrow_down，或者你可以像这里一样通过矢量创建三角形
<?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%"
android:toDegrees="45"
>
<shape android:shape="rectangle">
<solid android:color="#eaeaea"/>
<stroke
android:width="1dp"
android:color="#f00" />
</shape>
</rotate>
</item>
</layer-list>
回答by Jessicardo
The clean and right way to do this whilst keeping it dynamic is to extend the View class.
在保持动态的同时做到这一点的干净正确的方法是扩展 View 类。
Then in the onDraw you would do something like this:
然后在 onDraw 你会做这样的事情：
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
drawBackground(canvas);
}
private void drawBackground(Canvas canvas) {
int width = (int) mWidth;
int height = (int) mHeight;
Point a = new Point(0, 0);
Point b = new Point(width, 0);
Point c = new Point(width, height - mPointHeight);//mPointedHeight is the length of the triangle... in this case we have it dynamic and can be changed.
Point d = new Point((width/2)+(mPointedHeight/2), height - mPointHeight);
Point e = new Point((width/2), height);// this is the sharp point of the triangle
Point f = new Point((width/2)-(mPointedHeight/2), height - mPointHeight);
Point g = new Point(0, height - mPointHeight);
Path path = new Path();
path.moveTo(a.x, a.y);
path.lineTo(b.x, b.y);
path.lineTo(c.x, c.y);
path.lineTo(d.x, d.y);
path.lineTo(e.x, e.y);
path.lineTo(f.x, f.y);
path.lineTo(g.x, g.y);
canvas.drawPath(path, mPointedBackgroundPaint);// mPointedBackgroundPaint is whatever color you want as the fill.
}
There you go, no unnecessary layering or code that isn't dynamic or clean. You could also add the text in the box too.
你去吧，没有不必要的分层或不是动态或干净的代码。您也可以在框中添加文本。
回答by Hitesh Sahu
Create custom view and draw traingle with canvas
创建自定义视图并使用画布绘制三角形
package com.example.dickbutt;
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;
public class TriangleShapeView extends View {
public int colorCode = Color.MAGENTA;
public int getColorCode() {
return colorCode;
}
public void setColorCode(int colorCode) {
this.colorCode = colorCode;
}
public TriangleShapeView(Context context) {
super(context);
}
public TriangleShapeView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public TriangleShapeView(Context context, AttributeSet attrs) {
super(context, attrs);
}
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int w = getWidth() / 2;
int h = getHeight() / 2;
Path path = new Path();
path.moveTo(0, 0);
path.lineTo(w, 2 * h);
path.lineTo(2 * w, 0);
path.lineTo(0, 0);
path.close();
Paint p = new Paint();
p.setColor(colorCode);
p.setAntiAlias(true);
canvas.drawPath(path, p);
}
}
Result
结果
Usage
用法
<TextView
android:id="@+id/progress_value"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:background="@android:color/holo_purple"
android:gravity="center_horizontal"
android:text="200,0000000"
android:textColor="#fff" />
<com.example.dickbutt.TriangleShapeView
android:id="@+id/textView1"
android:layout_width="10dp"
android:layout_height="20dp"
android:layout_below="@+id/progress_value"
android:layout_centerHorizontal="true"
android:background="@drawable/rectangle"
android:gravity="center_horizontal"
android:textSize="10sp" />
Advantages
好处
- Change shape according to width and height of view .
- Highly customization possible.
- Look cleaner
- 根据视图的宽度和高度改变形状。
- 高度定制成为可能。
- 看起来更干净
回答by Aman Agnihotri
Use a triangle image and a rectangular image and mathematically align them in the above mentioned format. Use color filtering to dynamically change its color.
使用三角形图像和矩形图像，并按照上述格式在数学上对齐它们。使用颜色过滤来动态改变其颜色。
You can even draw them on a custom view, using vector graphics, using custom colors, and that would be another way of solving this problem.
您甚至可以在自定义视图上绘制它们，使用矢量图形，使用自定义颜色，这将是解决此问题的另一种方法。
回答by Prettygeek
回答by Aamirkhan
First you can create one xmlinside drawablefolder
首先你可以创建一个xml内部drawable文件夹
That xmlwill be responsible for the border color of rectangle shape
这xml将负责矩形形状的边框颜色
You can create such border shape with below code
您可以使用以下代码创建这样的边框形状
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<solid android:color="#B2E3FA" />
</shape>
</item>
<item android:left="5dp" android:bottom="5dp" android:top="5dp" >
<shape android:shape="rectangle">
<solid android:color="#D8D8D8" />
</shape>
</item>
</layer-list>
well this will create a required border to rectangle shape, you need to assign background of that rectangle shape with this drawable like this
好吧，这将为矩形形状创建所需的边框，您需要像这样使用此可绘制对象分配该矩形形状的背景
android:background="@drawable/bg"
where bgis xml file name which has been saved on drawable folder
bg已保存在 drawable 文件夹中的 xml 文件名在哪里
After that you need to put that triangle exactly below to rectangle object.
之后，您需要将该三角形正好放在矩形对象的下方。
I hope you understood my logic
我希望你明白我的逻辑
