android RadioButton bouton drawable gravité

Selon CompoundButton.onDraw() code source c'est toujours aligné à gauche.

(Note de la ligne buttonDrawable.setBounds(0, y, buttonDrawable.getIntrinsicWidth(), y + height);)

Vous aurez à dériver une nouvelle classe de RadioButton et remplacer onDraw().

EXEMPLE AJOUTÉ PLUS TARD:

Ok, voici donc ce que vous faites. Tout d'abord, voici un modèle:

<?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>

Deuxièmement voici le dessin RadioButtonCenter:

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);
}
}   
}

Enfin, voici un attrs.xml fichier dont vous avez besoin pour mettre en res/valeurs de sorte que le code ne peut accéder à la plate-forme d'attributs définis.

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

Basé sur @huée réponses, j'avais customisé à faire à la fois du texte et dessiné pour le centre, sans l'aide d'essences,

class RadioButtonCenter(context: Context, attrs: AttributeSet) : RadioButton(context, attrs) {
internal var buttonDrawable: Drawable? = null
init {
buttonDrawable = CompoundButtonCompat.getButtonDrawable(this@RadioButtonCenter)
}
override fun onDraw(canvas: Canvas) {
val iconHeight = buttonDrawable!!.intrinsicHeight
val buttonWidth = buttonDrawable!!.intrinsicWidth
val totalWidth =
buttonWidth + paint.measureText(text.toString()) + paddingLeft + paddingRight + compoundDrawablePadding
if (totalWidth >= width) {
super.onDraw(canvas)
} else {
setButtonDrawable(android.R.color.transparent)
val availableSpace = ((width - totalWidth) / 2).toInt()
buttonDrawable!!.state = drawableState
val height = height
var yTop = 0
val verticalGravity = gravity and Gravity.VERTICAL_GRAVITY_MASK
when (verticalGravity) {
Gravity.BOTTOM -> yTop = height - iconHeight
Gravity.CENTER_VERTICAL -> yTop = (height - iconHeight) / 2
}
var rightWidth = availableSpace + buttonWidth
buttonDrawable!!.setBounds(availableSpace, yTop, rightWidth, yTop + iconHeight)
buttonDrawable!!.draw(canvas)
rightWidth += compoundDrawablePadding
val yPos = (height / 2 - (paint.descent() + paint.ascent()) / 2) as Float
canvas.drawText(
text.toString(),
(rightWidth).toFloat(),
yPos,
paint
)
}
}

}