我有一个带定制radiobuttons的radiogroup。图标使用
设置rbFirst.setButtonDrawable(R.drawable.first);
但是图标不在中心,我该如何解决? 我在xml文件和类内部尝试了不同的属性,但它没有效果。
答案 0 :(得分:6)
尝试使用setGravity(Gravity.CENTER);
将其设置为背景可绘制。
如果没有帮助,你必须从RadioButton派生一个新类并覆盖onDraw()。
这是布局
<?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>
代码:
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);
}
}
}
最后,这是一个需要放入res / values的attrs.xml文件,以便代码可以获得平台定义的属性。
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="CompoundButton">
<attr name="android:button" />
</declare-styleable>
</resources>