Fragment

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package com.bwie.asus.project_two.activity;import android.os.Bundle;import android.support.annotation.IdRes;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentTransaction;import android.support.v7.app.AppCompatActivity;import android.widget.RadioButton;import android.widget.RadioGroup;import com.bwie.asus.project_two.R;import com.bwie.asus.project_two.fragment.Fragment01;import com.bwie.asus.project_two.fragment.Fragment02;import com.bwie.asus.project_two.fragment.Fragment03;import com.bwie.asus.project_two.fragment.Fragment04;import com.bwie.asus.project_two.fragment.Fragment05;public class SecondActivity extends AppCompatActivity {    private RadioGroup radio;    private RadioButton bt1;    private FragmentManager manager;    private Fragment01 fragment01;    private Fragment02 fragment02;    private Fragment03 fragment03;    private Fragment04 fragment04;    private Fragment05 fragment05;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_second);        //查找控件        radio = (RadioGroup) findViewById(R.id.radio);        bt1 = (RadioButton) findViewById(R.id.bt1);        manager = getSupportFragmentManager();        if (bt1.isChecked()){            FragmentTransaction transaction = manager.beginTransaction();            fragment01 = new Fragment01();            transaction.add(R.id.frame, fragment01);            transaction.commit();            System.out.println("fragment01 = " + fragment01);        }        initData();    }    private void initData() {        //RadioGroup的监听事件        radio.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(RadioGroup radioGroup, @IdRes int i) {                hideFragment();                switch (i){                    case R.id.bt1:                        FragmentTransaction transaction1 = manager.beginTransaction();                        if (fragment01 == null){                            fragment01 = new Fragment01();                            transaction1.add(R.id.frame, fragment01);                        }else{                            transaction1.show(fragment01);                        }                        transaction1.commit();                        break;                    case R.id.bt2:                        FragmentTransaction transaction2 = manager.beginTransaction();                        if (fragment02 == null) {                            fragment02 = new Fragment02();                            transaction2.add(R.id.frame, fragment02);                        }else {                            transaction2.show(fragment02);                        }                        transaction2.commit();                        break;                    case R.id.bt3:                        FragmentTransaction transaction3 = manager.beginTransaction();                        if (fragment03 == null) {                            fragment03 = new Fragment03();                            transaction3.add(R.id.frame, fragment03);                        }else{                            transaction3.show(fragment03);                        }                        transaction3.commit();                        break;                    case R.id.bt4:                        FragmentTransaction transaction4 = manager.beginTransaction();                        if (fragment04 == null) {                            fragment04 = new Fragment04();                            transaction4.add(R.id.frame, fragment04);                        }else{                            transaction4.show(fragment04);                        }                        transaction4.commit();                        break;                    case R.id.bt5:                        FragmentTransaction transaction5 = manager.beginTransaction();                        if (fragment05 == null) {                            fragment05 = new Fragment05();                            transaction5.add(R.id.frame, fragment05);                        }else{                            transaction5.show(fragment05);                        }                        transaction5.commit();                        break;                }            }        });    }    public void hideFragment(){        FragmentTransaction transaction1 = manager.beginTransaction();        if (fragment01 != null){            transaction1.hide(fragment01);        }if (fragment02 != null){            transaction1.hide(fragment02);        }        if (fragment03 != null){            transaction1.hide(fragment03);        }if (fragment04 != null){            transaction1.hide(fragment04);        }        if (fragment05 != null){            transaction1.hide(fragment05);        }        transaction1.commit();    }}
<?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.bwie.asus.project_two.activity.SecondActivity">    <FrameLayout        android:id="@+id/frame"        android:layout_weight="1"        android:layout_width="match_parent"        android:layout_height="match_parent">    </FrameLayout>    <RadioGroup        android:id="@+id/radio"        android:layout_width="match_parent"        android:layout_height="80dp"        android:orientation="horizontal"        >        <RadioButton            android:id="@+id/bt1"            android:layout_weight="1"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:button="@null"            android:checked="true"            android:background="@drawable/shape01"            />        <RadioButton            android:id="@+id/bt2"            android:layout_weight="1"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:button="@null"            android:background="@drawable/shape02"            />        <RadioButton            android:id="@+id/bt3"            android:layout_weight="1"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:button="@null"            android:background="@drawable/shape03"            />        <RadioButton            android:id="@+id/bt4"            android:layout_weight="1"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:button="@null"            android:background="@drawable/shape04"            />        <RadioButton            android:id="@+id/bt5"            android:layout_weight="1"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:button="@null"            android:background="@drawable/shape05"            />    </RadioGroup></LinearLayout>
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