底部选项卡

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<?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="com.bwie.fanmeihua.fanmeihua20171016.MainActivity">    <android.support.v4.view.ViewPager        android:id="@+id/vp"        android:layout_above="@+id/rg"        android:layout_width="match_parent"        android:layout_height="match_parent"></android.support.v4.view.ViewPager>    <RadioGroup        android:id="@+id/rg"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:orientation="horizontal">        <RadioButton            android:id="@+id/r1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1"            android:button="@null"            android:gravity="center"            android:padding="10dp"            android:text="首页" />        <RadioButton            android:id="@+id/r2"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1"            android:button="@null"            android:gravity="center"            android:padding="10dp"            android:text="想法" />        <RadioButton            android:id="@+id/r3"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1.06"            android:button="@null"            android:gravity="center"            android:padding="10dp"            android:text="市场" />        <RadioButton            android:id="@+id/r4"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1"            android:button="@null"            android:gravity="center"            android:padding="10dp"            android:text="通知" />        <RadioButton            android:id="@+id/r5"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1"            android:button="@null"            android:gravity="center"            android:padding="10dp"            android:text="更多" />    </RadioGroup></RelativeLayout>监听事件:rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {    @Override    public void onCheckedChanged(RadioGroup radioGroup, @IdRes int i) {        for (int j = 0; j <rlist.size() ; j++) {            int id = rlist.get(j).getId();            if (id == i){                vp.setCurrentItem(j);            }        }    }});vp.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {    @Override    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {    }    @Override    public void onPageSelected(int position) {        for (int i = 0; i <rlist.size() ; i++) {            if (i==position){                rlist.get(i).setTextColor(Color.RED);            }else{                rlist.get(i).setTextColor(Color.BLACK);            }        }    }    @Override    public void onPageScrollStateChanged(int state) {    }});
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