public class SecondActivity extends AppCompatActivity {

    private FragmengOne f_one;
    private FragmengTwo f_two;
    private FragmengThree f_three;
    private RadioButton rb1;
    private RadioButton rb2;
    private RadioButton rb3;
    private RadioButton rb4;
    private FragmentManager fragmentManager
 
;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        init();
        f_one = new FragmengOne();
        f_two = new FragmengTwo();
        f_three = new FragmengThree();
        fragmentManager 
 
= getSupportFragmentManager();
        FragmentTransaction transaction= fragmentManager.beginTransaction();
        transaction.add(R.id.fl,f_one).add(R.id.fl,f_two).add(R.id.fl,f_three).hide(f_two).hide(f_three).commit();


    }

    private void init() {
        rb1 = (RadioButton) findViewById(R.id.rb1
 
);
        rb2 = (RadioButton) findViewById(R.id.rb2);
        rb3 = (RadioButton) findViewById(R.id.rb3);
        rb4 = (RadioButton) findViewById(R.id.rb4);
        rb1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.hide(f_two).hide(f_three).show(f_one).commit();
            }
        });
        rb2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.hide(f_one).hide(f_three).show(f_two).commit();
            }
        });
        rb3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.hide(f_one).hide(f_two).show(f_three).commit();
            }
        });
        rb4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                startActivity(new Intent(SecondActivity.this,MyBuyActivity.class));
            }
        });
    }


}

xml 檔案

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.hhzmy.main.SecondActivity">

    <FrameLayout
        android:id="@+id/fl"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="10"
        android:layout_alignBottom="@+id/mHomeRadioGroup"
        android:layout_alignParentTop="true">

        <ProgressBar
            style="?android:attr/progressBarStyleHorizontal"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/progressBar"
            android:layout_gravity="center_horizontal|bottom" />
    </FrameLayout>

    <RadioGroup
        android:id="@+id/mHomeRadioGroup"
        android:layout_width="match_parent"
        android:layout_weight="1"
        android:layout_height="0dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:background="#33ffffff"
        android:orientation="horizontal">

        <RadioButton
            android:id="@+id/rb1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:button="@null"
            android:checked="true"
            android:drawableTop="@drawable/selector_tab_home"
            android:gravity="center"
            android:onClick="RB_1"
            />

        <RadioButton
            android:id="@+id/rb2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:button="@null"
            android:drawableTop="@drawable/selector_tab_find"
            android:gravity="center"
            android:onClick="RB_2"
             />

        <RadioButton
            android:id="@+id/rb3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:drawableTop="@drawable/selector_tab_search"
            android:button="@null"
            android:gravity="center"
            android:onClick="RB_3"
             />

        <RadioButton
            android:id="@+id/rb4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:button="@null"
            android:drawableTop="@drawable/selector_tab_xiaoxi"
            android:gravity="center"
            android:onClick="RB_4"
            />

    </RadioGroup>
</LinearLayout>

selector_tab_home.xml

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

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@mipmap/tab_class_pressed" android:state_pressed="false" android:state_selected="true"/>
    <item android:drawable="@mipmap/tab_class_pressed" android:state_checked="true" android:state_pressed="false"/>
    <item android:drawable="@mipmap/tab_class_normal"/>
</selector>

selector_tab_search.xml

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@mipmap/tab_shopping_pressed" android:state_pressed="false" android:state_selected="true" />
    <item android:drawable="@mipmap/tab_shopping_pressed" android:state_checked="true" android:state_pressed="false" />
    <item android:drawable="@mipmap/tab_shopping_normal"/>
</selector>

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@mipmap/tab_myebuy_pressed" android:state_pressed="false" android:state_selected="true" />
    <item android:drawable="@mipmap/tab_myebuy_pressed" android:state_checked="true" android:state_pressed="false" />
    <item android:drawable="@mipmap/tab_myebuy_normal"/>
</selector>