android radioButton動態切換圖片

一、屬性設置

在res/values/attrs.xml定義屬性文件

<resources>
    <declare-styleable name="ImageRadioButton">
        <attr name="drawableSize" format="dimension"/>
        <attr name="drawableTop" format="reference"/>

</declare-styleable>
</resources>

二、LayOut xml配置文件

xmlns:attRadoi="http://schemas.android.com/apk/res/com.my.test.pro"

定義屬性的命令空間，com.my.test.pro爲工程的包定義

定義自定義的屬性以下:

<com.my.test.pro.view.ImageRadioButton
            android:id="@+id/mytab_bt_test"
            style="@style/mytabground"
            android:text="TEST"
            attRadoi:drawableSize="28dp"
            attRadoi:drawableTop="@drawable/main_selector_test"
            android:drawableTop="@drawable/main_selector_test"
</com.my.test.pro.view.ImageRadioButton>

三、源碼示例

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.RadioButton;

public class ImageRadioButton extends RadioButton {     private int mDrawableSize;// xml文件中設置的大小     public ImageRadioButton(Context context) {         this(context, null, 0);     }     public ImageRadioButton(Context context, AttributeSet attrs) {         this(context, attrs, 0);     }     public ImageRadioButton(Context context, AttributeSet attrs, int defStyle) {         super(context, attrs, defStyle);         //Auto-generated constructor stub         Drawable drawableLeft = null, drawableTop = null, drawableRight = null, drawableBottom = null;         TypedArray a = context.obtainStyledAttributes(attrs,                 R.styleable.ImageRadioButton);         int n = a.getIndexCount();         for (int i = 0; i < n; i++) {             int attr = a.getIndex(i);             Log.i("ImageRadioButton", "attr:" + attr);             switch (attr) {                 case R.styleable.ImageRadioButton_drawableSize:                     mDrawableSize = a.getDimensionPixelSize(R.styleable.ImageRadioButton_drawableSize, 50);                     Log.i("ImageRadioButton", "mDrawableSize:" + mDrawableSize);                     break;                 case R.styleable.ImageRadioButton_drawableTop:                     drawableTop = a.getDrawable(attr);                     break;                 case R.styleable.ImageRadioButton_drawableBottom:                     drawableRight = a.getDrawable(attr);                     break;                 case R.styleable.ImageRadioButton_drawableRight:                     drawableBottom = a.getDrawable(attr);                     break;                 case R.styleable.ImageRadioButton_drawableLeft:                     drawableLeft = a.getDrawable(attr);                     break;                 default :                     break;             }         }         a.recycle();         setCompoundDrawablesWithIntrinsicBounds(drawableLeft, drawableTop, drawableRight, drawableBottom);     }     public void setCompoundDrawablesWithIntrinsicBounds(Drawable left,                                                         Drawable top, Drawable right, Drawable bottom) {         if (left != null) {             left.setBounds(0, 0, mDrawableSize, mDrawableSize);         }         if (right != null) {             right.setBounds(0, 0, mDrawableSize, mDrawableSize);         }         if (top != null) {             top.setBounds(0, 0, mDrawableSize, mDrawableSize);         }         if (bottom != null) {             bottom.setBounds(0, 0, mDrawableSize, mDrawableSize);         }         setCompoundDrawables(left, top, right, bottom);     } }