<?xml version="1.0" encoding="utf-8"?><LinearLayout 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" android:orientation="vertical" tools:context="com.example.jackhu.radiobuttondemo.MainActivity"> <FrameLayout  android:id="@+id/mFragment"  android:layout_width="match_parent"  android:layout_height="0dp"  android:layout_weight="1"></FrameLayout> <RadioGroup  android:layout_marginBottom="2dp"  android:id="@+id/mRadioGroup"  android:orientation="horizontal"  android:layout_width="match_parent"  android:layout_height="48dp">  <RadioButton   android:drawableTop="@drawable/rbhome"   android:button="@null"   android:checked="true"   android:textColor="@color/colorRadioButtonP"   android:id="@+id/mRb_home"   android:gravity="center"   android:layout_width="0dp"   android:text="Home"   android:layout_weight="1"   android:layout_height="match_parent" />  <RadioButton   android:drawableTop="@drawable/rb_message"   android:button="@null"   android:textColor="@color/colorRadioButtonN"   android:id="@+id/mRb_message"   android:gravity="center"   android:layout_width="0dp"   android:text="Message"   android:layout_weight="1"   android:layout_height="match_parent" />  <RadioButton   android:drawableTop="@drawable/rbfind"   android:button="@null"   android:textColor="@color/colorRadioButtonN"   android:id="@+id/mRb_find"   android:gravity="center"   android:layout_width="0dp"   android:text="Find"   android:layout_weight="1"   android:layout_height="match_parent" />  <RadioButton   android:drawableTop="@drawable/rbmy"   android:button="@null"   android:textColor="@color/colorRadioButtonN"   android:id="@+id/mRb_my"   android:gravity="center"   android:layout_width="0dp"   android:text="My"   android:layout_weight="1"   android:layout_height="match_parent" /> </RadioGroup></LinearLayout>

<?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/home_p"/> <item android:drawable="@drawable/home_n"/></selector>

package com.example.jackhu.radiobuttondemo.fragment;import android.os.Bundle;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import com.example.jackhu.radiobuttondemo.R;/** * A simple {@link Fragment} subclass. */public class HomeFragment extends Fragment { public HomeFragment() {  // Required empty public constructor } //單例模式 public static HomeFragment newInstance(){  HomeFragment homeFragment=new HomeFragment();  return homeFragment; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container,        Bundle savedInstanceState) {  // Inflate the layout for this fragment  return inflater.inflate(R.layout.fragment_home, container, false); }}

package com.example.jackhu.radiobuttondemo;import android.support.annotation.IdRes;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentTransaction;import android.support.v4.content.ContextCompat;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.RadioButton;import android.widget.RadioGroup;import android.widget.Toast;import com.example.jackhu.radiobuttondemo.fragment.FindFragment;import com.example.jackhu.radiobuttondemo.fragment.HomeFragment;import com.example.jackhu.radiobuttondemo.fragment.MessageFragment;import com.example.jackhu.radiobuttondemo.fragment.MyFragment;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener { private RadioGroup mRadioGroup; private List<Fragment> fragments = new ArrayList<>(); private Fragment fragment; private FragmentManager fm; private FragmentTransaction transaction; private RadioButton rb_Home,rb_Message,rb_Find,rb_My; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  initView(); //初始化組件  mRadioGroup.setOnCheckedChangeListener(this); //點擊事件  fragments = getFragments(); //添加布局  //添加默認布局  normalFragment(); } //默認布局 private void normalFragment() {  fm=getSupportFragmentManager();  transaction=fm.beginTransaction();  fragment=fragments.get(0);  transaction.replace(R.id.mFragment,fragment);  transaction.commit(); } private void initView() {  mRadioGroup = (RadioGroup) findViewById(R.id.mRadioGroup);  rb_Home= (RadioButton) findViewById(R.id.mRb_home);  rb_Message= (RadioButton) findViewById(R.id.mRb_message);  rb_Find= (RadioButton) findViewById(R.id.mRb_find);  rb_My= (RadioButton) findViewById(R.id.mRb_my); } @Override public void onCheckedChanged(RadioGroup group, @IdRes int checkedId) {  fm=getSupportFragmentManager();  transaction=fm.beginTransaction();  switch (checkedId){   case R.id.mRb_home:    fragment=fragments.get(0);    transaction.replace(R.id.mFragment,fragment);    Toast.makeText(this, "Home", Toast.LENGTH_SHORT).show();    break;   case R.id.mRb_message:    fragment=fragments.get(1);    transaction.replace(R.id.mFragment,fragment);    Toast.makeText(this, "Message", Toast.LENGTH_SHORT).show();    break;   case R.id.mRb_find:    fragment=fragments.get(2);    transaction.replace(R.id.mFragment,fragment);    Toast.makeText(this, "Find", Toast.LENGTH_SHORT).show();    break;   case R.id.mRb_my:    fragment=fragments.get(3);    transaction.replace(R.id.mFragment,fragment);    Toast.makeText(this, "My", Toast.LENGTH_SHORT).show();    break;  }  setTabState();  transaction.commit(); } //設置選中和未選擇的狀態 private void setTabState() {  setHomeState();  setMessageState();  setFindState();  setMyState(); } private void setMyState() {  if (rb_My.isChecked()){   rb_My.setTextColor(ContextCompat.getColor(this,R.color.colorRadioButtonP));  }else{   rb_My.setTextColor(ContextCompat.getColor(this,R.color.colorRadioButtonN));  } } private void setFindState() {  if (rb_Find.isChecked()){   rb_Find.setTextColor(ContextCompat.getColor(this,R.color.colorRadioButtonP));  }else{   rb_Find.setTextColor(ContextCompat.getColor(this,R.color.colorRadioButtonN));  } } private void setMessageState() {  if (rb_Message.isChecked()){   rb_Message.setTextColor(ContextCompat.getColor(this,R.color.colorRadioButtonP));  }else{   rb_Message.setTextColor(ContextCompat.getColor(this,R.color.colorRadioButtonN));  } } private void setHomeState() {  if (rb_Home.isChecked()){   rb_Home.setTextColor(ContextCompat.getColor(this,R.color.colorRadioButtonP));  }else{   rb_Home.setTextColor(ContextCompat.getColor(this,R.color.colorRadioButtonN));  } } public List<Fragment> getFragments() {  fragments.add(new HomeFragment());  fragments.add(new MessageFragment());  fragments.add(new FindFragment());  fragments.add(new MyFragment());  return fragments; }}