选中/取消选中后如何更改单选按钮的背景颜色/形状 [英] How to change background color/shape of a Radiobutton when selected/deselected

问题描述

我正在以编程方式将单选按钮添加到for循环中的RadioGroup中.我希望我的按钮在未选中时具有某种背景色，而在选中它们时具有另一种背景色(一次只能选择一个).我的问题是我也希望此背景是一个圆角矩形.我有部分工作，但是每当我选择一个答案时，它都会将该按钮的背景设置为白色，但不会重置其他任何按钮.

I am adding radiobuttons programatically to a RadioGroup in a for loop. I want my buttons to have a certain background color when not checked, and another when they are checked (only one can be selected at once). My problem is that I also want this background to be a rounded rectangle. I have it working partially, but whenever I select an answer, it will set that button's background to white, but it won't reset any of the other buttons.

我知道我需要某种选择器对象，才能添加无线电组期望的切换行为.我能够找到一些示例，但是它们仅显示了如何将纯色设置为背景.我需要使用这个圆角形状.所以，我的麻烦是弄清楚如何融合两者.我可能会犯完全错误的错误.如果有更好的方法来实现我想要的，我宁愿使用它而不是挽救我已经尝试过的方法.

I understand that I need some type of selector object, to add the toggle behavior that is expected from the radiogroup. I was able to find some examples of that, but they only showed how to set a solid color as a background. I need to use this rounded corner shape. So, my trouble is figuring out how to blend the two. I could be going about this completely wrong. If there is a better approach to achieving what I want, I would prefer to use that rather than salvage what I've already tried.

通过创建两个XML文件，每个文件都有一个形状对象和自己的背景色，我得以接近.如果选择了单选按钮，则其样式将设置为radio_button_checked样式.但是，我知道我正在解决此错误，因为另一个选中的按钮没有关闭.我基本上可以单击所有按钮并将它们全部变成白色背景.我知道有更好的方法可以做到这一点，我只是不知道它是什么

I was able to get close by creating two XML files, each with a shape object and its own background color. If a radiobutton is selected, its style gets set to the radio_button_checked" style. But, I know I am approaching this wrong because the other checked button does not toggle off. I can basically click all of the buttons and get them all to have white backgrounds. I know there is a better way to do this, I just don't know what it is

这是我在其中添加按钮以及radiogroup rg的更改侦听器的循环(rg是我的RadioGroup，答案只是一个字符串的HashMap.它们不影响与此问题有关的任何东西.buttonTintList行是只是在那里改变圆圈颜色)

Here is the loop where I add the buttons, along with the change listener for radiogroup rg (rg is my RadioGroup and answers is just a HashMap of strings. They don't affect anything related to this problem. The buttonTintList line is just there to change circle color)

for(int i = 0; i < answers.size(); i++)
    {
        RadioButton rb = new RadioButton(context);
        rb.setTextColor(ContextCompat.getColor(context, R.color.colorPrimaryDark));


        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            rb.setButtonTintList(ColorStateList.valueOf(ContextCompat.getColor( context, R.color.colorAccent)));
        }
        rb.setBackground(context.getResources().getDrawable(R.drawable.radiobutton_style_unchecked));
        rb.setText(answers.get(i));
        rb.setWidth(800);
        rb.setHeight(150);
        rb.setTextSize(18);
        rb.setLayoutParams(params);
        rg.addView(rb);
    }
    /*  Store the answer */
    rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            RadioButton rb= (RadioButton)group.findViewById(checkedId);
            answer = rb.getText().toString();

            rb.setBackground(context.getResources().getDrawable(R.drawable.radiobutton_style_checked));

        }
    });

这是未选中按钮的XML(radiobutton_style_unchecked.xml)

Here is the XML for unchecked buttons (radiobutton_style_unchecked.xml)

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
<corners android:radius="6dp" />
<gradient
    android:angle="45"
    android:centerColor="@color/colorPrimaryLight"
    android:centerX="35%"
    android:endColor="@color/colorPrimaryLight"
    android:startColor="@color/colorPrimaryLight"
    android:type="linear" />

<padding
    android:bottom="5dp"
    android:left="0dp"
    android:right="0dp"
    android:top="5dp" />


</shape>

选中按钮的样式完全相同，但是使用白色而不是colorPrimaryLight

The style for checked buttons is exactly the same, but with white instead of colorPrimaryLight

以下是未选择任何内容的样子:

Here is what it looks like with nothing selected:

这是选择一项时的外观.

Here is what it looks like when one item is selected.

这是当我选择多个时发生的情况

And this is what happens when I select more than one

推荐答案

尝试一下

<?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/holo_blue_light"
    android:orientation="vertical">

    <RadioGroup
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <RadioButton
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:background="@drawable/radio_background"
            android:padding="10dp"
            android:text="Yes" />

        <RadioButton
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:background="@drawable/radio_background"
            android:padding="10dp"
            android:text="No" />

    </RadioGroup>

</LinearLayout>

@ drawable/radio_background

@drawable/radio_background

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@android:color/white" android:state_checked="true" />
    <item android:drawable="@color/colorAccent" android:state_checked="false" />
</selector>

输出

<?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/holo_blue_light"
    android:orientation="vertical">

    <RadioGroup
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <RadioButton
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:background="@drawable/test"
            android:padding="10dp"
            android:text="Yes" />

        <RadioButton
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:background="@drawable/test"
            android:padding="10dp"
            android:text="No" />

    </RadioGroup>

</LinearLayout>

@ drawable/test

@drawable/test

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" android:exitFadeDuration="@android:integer/config_shortAnimTime">

    <item android:drawable="@drawable/radio_selected" android:state_checked="true" />
    <item android:drawable="@drawable/radio_normal" />

</selector>

@ drawable/radio_selected

@drawable/radio_selected

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <corners android:radius="20dp" />
    <solid android:color="@android:color/white" />
    <padding
        android:bottom="5dp"
        android:left="0dp"
        android:right="0dp"
        android:top="5dp" />


</shape>

@ drawable/radio_normal

@drawable/radio_normal

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <corners android:radius="20dp" />
    <solid android:color="@color/colorAccent" />
    <padding
        android:bottom="5dp"
        android:left="0dp"
        android:right="0dp"
        android:top="5dp" />

</shape>

输出

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