Android圈背景变成椭圆形

Question

我想在textview上放一个圆圈背景.渲染时圆圈变成椭圆形.

我的布局XML:

    <TextView
        android:id="@+id/amount_key"
        android:layout_weight="1"
        android:layout_height="match_parent"
        android:layout_width="match_parent"
        android:layout_marginRight="2dp"
        android:gravity="center"
        android:background="@drawable/circle"
        android:layout_marginLeft="20dp"
        android:text="3\ndays"
        android:padding="20dp"
        android:textColor="#ffffff"
        android:textStyle="bold"
        android:textSize="25dp" />


</LinearLayout>

我的圈子背景:

<shape 
    xmlns:android="http://schemas.android.com/apk/res/android"
            android:shape="oval">

            <solid 
               android:color="#79bfea"/>
</shape>

Answer 1

• 改变你textView的layout_height,并layout_width以wrap_content
• 在shape标签内添加尺寸标签,如下所示

<shape 
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">> 
<solid android:color="#79bfea" />
<size android:height="25dp"
   android:width="25dp"/>
</shape>

如果它仍然是椭圆形,请尝试增加尺寸标签中的宽度和高度.它对我有用!

Answer 2

您可以创建自己的Drawable,将半径限制为宽度和高度之间的最小值.

package com.example.android;

import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;

public class ColorCircleDrawable extends Drawable {
    private final Paint mPaint;
    private int mRadius = 0;

    public ColorCircleDrawable(final int color) {
        this.mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        this.mPaint.setColor(color);
    }

    @Override
    public void draw(final Canvas canvas) {
        final Rect bounds = getBounds();
        canvas.drawCircle(bounds.centerX(), bounds.centerY(), mRadius, mPaint);
    }

    @Override
    protected void onBoundsChange(final Rect bounds) {
        super.onBoundsChange(bounds);
        mRadius = Math.min(bounds.width(), bounds.height()) / 2;
    }

    @Override
    public void setAlpha(final int alpha) {
        mPaint.setAlpha(alpha);
    }

    @Override
    public void setColorFilter(final ColorFilter cf) {
        mPaint.setColorFilter(cf);
    }

    @Override
    public int getOpacity() {
        return PixelFormat.TRANSLUCENT;
    }
}

然后应用于您的textView:

textView.setBackground(new ColorCircleDrawable(Color.RED));

Answer 3

为了得到这个

我在彼此内部使用了两个LinearLayout并将父重力设置为CENTER

<LinearLayout
android:layout_width="80dp"
android:layout_height="50dp"
android:baselineAligned="false"
android:gravity="center"
android:orientation="vertical">

<LinearLayout
    android:layout_width="45dp"
    android:layout_height="45dp"
    android:gravity="center"
    android:background="@drawable/oval"
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="Text"
        android:textSize="12sp" />
</LinearLayout>
</LinearLayout>

这是可绘制文件夹中的椭圆形

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <solid android:color="#393939" />
    <size
        android:width="40dp"
        android:height="40dp" />
</shape>

没有内部LinearLayout，您将得到这个

它的代码是

<LinearLayout
android:layout_width="80dp"
android:layout_height="50dp"
android:baselineAligned="false"
android:gravity="center"
android:background="@drawable/oval"
android:orientation="vertical">

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:text="Text"
    android:textSize="12sp" />
</LinearLayout>