動態設定Button大小及點選事件:

在佈局中寫下這段程式碼:新建立一個class 名字叫MyRadioButton 繼承RdioButton

package duan.com.homework.helper;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.RadioButton;
import duan.com.homework.R;
 
/**
 * Created by Administrator on 2016/9/22.
 */
public class MyRadioButton extends RadioButton {

    public MyRadioButton(Context context) {
        super(context);
}

    public MyRadioButton(Context context, AttributeSet attrs) {
        super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs,
 
R.styleable.MyRadioButton);
//drawableSize = a.getDimensionPixelSize(R.styleable.MyRadioButton_rbDrawableTopSize, 50);
Drawable drawableTop = a.getDrawable(R.styleable.MyRadioButton_rbDrawableTop);
a.recycle();
setCompoundDrawablesWithIntrinsicBounds(null,drawableTop,null,null);
}



    public MyRadioButton(Context context, 
 
AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
}

    @Override
public void setCompoundDrawablesWithIntrinsicBounds(Drawable left, Drawable top, Drawable right, Drawable bottom) {
        super.setCompoundDrawablesWithIntrinsicBounds(left, top, right, bottom);
        if (top!=null){
            top.setBounds(0,0,50,50);
}
        setCompoundDrawables(left,top,right,bottom);
}
}

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="MyRadioButton">
        <attr name="rbDrawableTopSize" format="dimension"/>
        <attr name="rbDrawableTop" format="reference"/>
    </declare-styleable>
</resources>

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

 字型顏色

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_checked="true" android:color="#168DFE"></item>
    <item android:state_checked="false" android:color="#777777"></item>
</selector>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<RadioGroup
android:id="@+id/radioGroup_main"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"

    // 橫向一定要寫 不然會沒有東西
android:orientation="horizontal">
    <duan.com.homework.helper.MyRadioButton
android:id="@+id/button_news"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"

        //這步就是去掉Button前面的圓圈 
android:button="@null"

        //選中的圖片 預設選中 因為是第一個按鈕
android:checked="true"

        //讓文字居中 在Button的下面
android:gravity="center"
android:text="新聞"

        //這步最重要 不能自動生成 需要手動來寫 就是把之前寫的attrs中的rbDrawableTop拿來使用 

後面就是drawable資源裡面的選中和非選中 按鈕的切換
app:rbDrawableTop="@drawable/button_color_news" />

如果不是你想要的 你還可以在MyRadioButton中修改  

下面就是我主佈局裡面的程式碼  我是模仿騰訊底部做的  下一步做頂部導航 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
    <RadioGroup
android:id="@+id/radioGroup_main"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="horizontal">
        <duan.com.homework.helper.MyRadioButton
android:id="@+id/button_news"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:layout_weight="1"
android:button="@null"
android:checked="true"
android:gravity="center"
android:text="新聞"
android:textColor="@drawable/button_text_color"
app:rbDrawableTop="@drawable/button_color_news" />
        <duan.com.homework.helper.MyRadioButton
android:id="@+id/button_recommend"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:layout_weight="1"
android:button="@null"
android:checked="false"
android:gravity="center"
android:text="推薦"
android:textColor="@drawable/button_text_color"
app:rbDrawableTop="@drawable/button_color_recommend" />
        <duan.com.homework.helper.MyRadioButton
android:id="@+id/button_live"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:layout_weight="1"
android:button="@null"
android:checked="false"
android:gravity="center"
android:text="直播"
android:textColor="@drawable/button_text_color"
app:rbDrawableTop="@drawable/button_color_live" />
        <duan.com.homework.helper.MyRadioButton
android:id="@+id/button_me"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:layout_weight="1"
android:button="@null"
android:checked="false"
android:gravity="center"
android:text="我"
android:textColor="@drawable/button_text_color"
app:rbDrawableTop="@drawable/button_color_me" />
    </RadioGroup>

<FrameLayout
android:id="@+id/frame"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@id/radioGroup_main"
></FrameLayout>