Android的单选按钮图像 [英] Android radiobutton image

问题描述

我有一个自定义的单选按钮一个RadioGroup中。图标使用设置

  rbFirst.setButtonDrawable（R.drawable.first）;
 

但图标是不是在市中心，我该如何解决？ 我试图在XML文件中，内线等级不同的属性，但它没有任何效果。

解决方案

尝试使用 setGravity（Gravity.CENTER）; 将其设置为背景绘制的。

或者，如果它不能帮助你将不得不从单选派生新类和重写的OnDraw（）。

下面的布局

 ＆LT; XML版本=1.0编码=UTF-8＆GT？;
＆LT; RelativeLayout的的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    机器人：方向=垂直
    机器人：layout_width =FILL_PARENT
    机器人：layout_height =FILL_PARENT
    ＆GT;
＆LT; org.test.TestProj.RadioButtonCenter
    机器人：ID =@ + ID / MyView的
    机器人：layout_width =FILL_PARENT
    机器人：layout_height =100dp
    机器人：layout_centerInParent =真
    机器人：文本=按钮测试
    /＆GT;
＆LT; / RelativeLayout的＆GT;
 

在code：

 包org.test.TestProj;

进口android.content.Context;
进口android.content.res.TypedArray;
进口android.util.AttributeSet;
进口android.view.Gravity;
进口android.widget.RadioButton;
进口android.graphics.Canvas;
进口android.graphics.drawable.Drawable;

公共类RadioButtonCenter扩展单选{

    公共RadioButtonCenter（上下文的背景下，ATTRS的AttributeSet）{
        超（背景下，ATTRS）;
        TypedArray一个= context.obtainStyledAttributes（ATTRS，R.styleable.CompoundButton，0，0）;
        buttonDrawable = a.getDrawable（1）;
        setButtonDrawable（android.R.color.transparent）;
    }
    绘制对象buttonDrawable;


     @覆盖
        保护无效的OnDraw（帆布油画）{
            super.onDraw（画布）;

            如果（buttonDrawable！= NULL）{
                buttonDrawable.setState（getDrawableState（））;
                最终诠释verticalGravity = getGravity（）及Gravity.VERTICAL_GRAVITY_MASK;
                最终诠释身高= buttonDrawable.getIntrinsicHeight（）;

                INT Y = 0;

                开关（verticalGravity）{
                    案例Gravity.BOTTOM：
                        Y =的getHeight（） - 高度;
                        打破;
                    案例Gravity.CENTER_VERTICAL：
                        Y =（的getHeight（） - 高度）/ 2;
                        打破;
                }

            INT buttonWidth = buttonDrawable.getIntrinsicWidth（）;
            INT buttonLeft =（的getWidth（） -  buttonWidth）/ 2;
            buttonDrawable.setBounds（buttonLeft，Y，buttonLeft + buttonWidth，Y +高）;
                buttonDrawable.draw（画布）;
            }
        }
}
 

最后，这里是你需要把RES /值，因此code可以在平台定义的属性得到attrs.xml文件。

 ＆LT; XML版本=1.0编码=UTF-8＆GT？;
＆LT;资源＆GT;
     ＆LT;申报，设置样式名称=CompoundButton＆GT;
        ＆LT; attr指示NAME =安卓键/＆GT;
    ＆LT; /申报，设置样式＆GT;
＆LT; /资源＆GT;
 

I have a radiogroup with custom radiobuttons. Icons are set using

rbFirst.setButtonDrawable(R.drawable.first);

But icon is not in the center, how do I fix it? I tried different attributes in xml file and inside class but it had no effect.

解决方案

Try using setGravity(Gravity.CENTER); of setting it as a background drawable.

Or if it does not help you will have to derive a new class from RadioButton and override onDraw().

Here's layout

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<org.test.TestProj.RadioButtonCenter
    android:id="@+id/myview"
    android:layout_width="fill_parent" 
    android:layout_height="100dp" 
    android:layout_centerInParent="true"
    android:text="Button test"
    />
</RelativeLayout>

The code:

package org.test.TestProj;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.Gravity;
import android.widget.RadioButton;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;

public class RadioButtonCenter extends RadioButton {

    public RadioButtonCenter(Context context, AttributeSet attrs) {
        super(context, attrs);
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CompoundButton, 0, 0);
        buttonDrawable = a.getDrawable(1);
        setButtonDrawable(android.R.color.transparent);
    }
    Drawable buttonDrawable;


     @Override
        protected void onDraw(Canvas canvas) {
            super.onDraw(canvas);

            if (buttonDrawable != null) {
                buttonDrawable.setState(getDrawableState());
                final int verticalGravity = getGravity() & Gravity.VERTICAL_GRAVITY_MASK;
                final int height = buttonDrawable.getIntrinsicHeight();

                int y = 0;

                switch (verticalGravity) {
                    case Gravity.BOTTOM:
                        y = getHeight() - height;
                        break;
                    case Gravity.CENTER_VERTICAL:
                        y = (getHeight() - height) / 2;
                        break;
                }

            int buttonWidth = buttonDrawable.getIntrinsicWidth();
            int buttonLeft = (getWidth() - buttonWidth) / 2;
            buttonDrawable.setBounds(buttonLeft, y, buttonLeft+buttonWidth, y + height);
                buttonDrawable.draw(canvas);
            }
        }   
}

Finally, here's an attrs.xml file you need to put in res/values so the code can get at platform-defined attributes.

<?xml version="1.0" encoding="utf-8"?>
<resources>    
     <declare-styleable name="CompoundButton">
        <attr name="android:button" />
    </declare-styleable>
</resources>

这篇关于Android的单选按钮图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！