如何删除 Android CheckBox 周围的填充

Question

I need to put check to the right hand top corner of my imageview. But when I do this I noticed a default margin around my checkbox. Is there a way to remove this??

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <FrameLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true" >

        <ImageView
            android:id="@+id/thumbImage"
            android:layout_width="100dp"
            android:layout_height="132dp"
            android:layout_gravity="center" />
    </FrameLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:background="#ff0000"
        android:gravity="center" >

        <CheckBox
            android:id="@+id/itemCheckBox"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentEnd="true"
            android:layout_gravity="center"
            android:button="@drawable/checkbox_background"
            android:paddingLeft="0dp"
            android:paddingTop="0dp" />

    </LinearLayout>

</RelativeLayout>

Answer 1

There's now a better way of doing this:

android:minWidth="0dp"
android:minHeight="0dp"

Answer 2

You could use a negative margin.

android:layout_marginTop = "-5dp"
android:layout_marginRight = "-5dp"

Answer 3

To remove radio button default margins or padding in android

if you using xml

android:minWidth="0dp"
android:minHeight="0dp"

if using programmatically

 radiobtn.setMinimumHeight(0);
 radiobtn.setMinimumWidth(0);

Answer 4

This works for me in Constraint Layout . I hope it will work for another layout.

<androidx.appcompat.widget.AppCompatCheckBox
                ...
                android:translationX="-5dp"
                 />

Answer 5

If you look at the source code for the CompoundButton class that is extended by the Checkbox class at the onDraw() method, the padding depends from the gravity

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

            final int top;
            switch (verticalGravity) {
                case Gravity.BOTTOM:
                    top = getHeight() - drawableHeight;
                    break;
                case Gravity.CENTER_VERTICAL:
                    top = (getHeight() - drawableHeight) / 2;
                    break;
                default:
                    top = 0;
            }
       ...
    }

So what you can do is set the xml value for the attribute gravity to
android:gravity="top|start"

But this can be used only if you don't want to use text with your checkbox, since the gravity is used to center the text.

Answer 6

Thanks to @VladislavShcherbakov comment, it is:

android:paddingLeft="-5dp"
android:layout_marginStart="-5dp"
android:layout_marginLeft="-5dp"
// android:translationX="-5dp"

Answer 7

Why to complicate with a negative padding and all. Use the simple and straight way, give padding to the FrameLayout instead tof the top most Relative layout that would do the trick. As you have only the CheckBox in the second layout there is no need to give padding for it.

Please do let me know if you face any problems or have any further doubts