package com.example.administrator.lovegift;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.widget.RadioGroup;

import com.example.administrator.lovegift.fragment.CategoryFragment;
import com.example.administrator.lovegift.fragment.GuideFragment;
import com.example.administrator.lovegift.fragment.HortFragment;
import com.example.administrator.lovegift.fragment.MainFragment;

import java.lang.reflect.InvocationTargetException;

public class MainActivity extends BaseActivity implements RadioGroup.OnCheckedChangeListener {

    private RadioGroup mRadioGroup;
    private Fragment mCashFragment;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }

    private void initView() {
        mRadioGroup = (RadioGroup) findViewById(R.id.radioGroup);
        mRadioGroup.setOnCheckedChangeListener(this);

        //首先默认加载第一个GuideFragment
        FragmentManager fm = getSupportFragmentManager();
        FragmentTransaction ft = fm.beginTransaction();
        mCashFragment = new GuideFragment();
        ft.add(R.id.container_activity_main, mCashFragment, GuideFragment.TAG);
        ft.commit();



    }

    /***********************
     * RadioGroup.OnCheckedChangeListener的回调
     ******************************/
    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        switch (checkedId) {
            case R.id.controller_guide:
                switchPage(GuideFragment.TAG, GuideFragment.class);

                break;
            case R.id.controller_hort:
                switchPage(HortFragment.TAG, HortFragment.class);

                break;
            case R.id.controller_category:
                switchPage(CategoryFragment.TAG, CategoryFragment.class);

                break;
            case R.id.controller_main:
                switchPage(MainFragment.TAG, MainFragment.class);

                break;
        }
    }

    //切换Fragment 的方法
    private void switchPage(String TAG, Class<? extends Fragment> cls) {
        FragmentManager fm = getSupportFragmentManager();
        FragmentTransaction tr = fm.beginTransaction();
        //隐藏当前显示的页面
        if (mCashFragment != null) {
            tr.hide(mCashFragment);
        }
        //去FragmentManager栈中查找将要显示的页面是否存在
        mCashFragment = fm.findFragmentByTag(TAG);
        if (mCashFragment != null) {
            //显示页面
            tr.show(mCashFragment);
        } else {

            try {
                mCashFragment = cls.getConstructor().newInstance();
                tr.add(R.id.container_activity_main, mCashFragment, TAG);
            } catch (InstantiationException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                e.printStackTrace();
            } catch (NoSuchMethodException e) {
                e.printStackTrace();
            }

        }
        //提交
        tr.commit();
    }
}

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.administrator.mygift.MainActivity">



    <FrameLayout
        android:id="@+id/container_activity_main"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        />



    <include
        layout="@layout/activity_controller"/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="horizontal"
              android:layout_width="match_parent"
              android:layout_height="@dimen/activity_controller_height"
              android:background="#F5F5F5"

    >

    <RadioGroup
        android:id="@+id/radioGroup"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal"
        android:gravity="center"
        >
        <RadioButton
            android:id="@+id/controller_guide"
            style="@style/below_activity"
            android:text="指南"
            android:drawableTop="@drawable/guide"
            android:checked="true"
            />
        <RadioButton
            android:id="@+id/controller_hort"
            style="@style/below_activity"
            android:text="热门"
            android:drawableTop="@drawable/hort"
            />
        <RadioButton
            android:id="@+id/controller_category"
            style="@style/below_activity"
            android:text="分类"
            android:drawableTop="@drawable/category"
            />
        <RadioButton
            android:id="@+id/controller_main"
            style="@style/below_activity"
            android:text="我的"
            android:drawableTop="@drawable/main"

            />

    </RadioGroup>

</LinearLayout>

原文链接：https://blog.csdn.net/llixiangjian/article/details/70233800

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