如何在android中制作圆角视图

Question

我想制作一个圆形视图，如下所示

我希望以编程方式更改半径，颜色来创建该视图。不是来自xml配置

Answer 1

制作新课程

  

ShapeMaker.class

public class ShapeMaker {

public ShapeMaker() {

}

public GradientDrawable circle (int backgroundColor, int borderColor, int storke, int radius) {
    GradientDrawable shape = new GradientDrawable();
    shape.setShape(GradientDrawable.RECTANGLE);
    shape.setColor(backgroundColor);
    shape.setStroke(storke, borderColor);
    shape.setCornerRadius(radius);

    return shape;
}
}

称之为

 myLayout.setBackground(new ShapeMaker().circle(Color.BLUE, Color.BLACK, 1, 10));

  

修改

布局示例：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/holo_green_light"
tools:context="net.netbox4u.gradientcolor.MainActivity">

<TextView
    android:id="@+id/textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    android:elevation="8dp"
    android:text="Imagine"
    android:textSize="30sp"
    android:textStyle="bold"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<LinearLayout
    android:id="@+id/shape_background"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    android:orientation="vertical"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="1.0"></LinearLayout>
</android.support.constraint.ConstraintLayout>

MainActivity示例：

import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.LinearLayout;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        LinearLayout shapeBackgroundLayout = (LinearLayout)findViewById(R.id.shape_background);

        shapeBackgroundLayout.setBackground(new ShapeMaker().circle(Color.WHITE, Color.TRANSPARENT, 0, 50));
    }
}