安卓案例：利用单选按钮切换碎片

一、运行效果

二、涉及知识点

1. 相对布局
2. 单选按钮组
3. 单选按钮
4. 背景选择器
5. 碎片

三、实现步骤

1、创建安卓应用【SwitchFragmentByRadioButton】

2、将图片素材拷贝到drawable目录

3、主界面布局activity_main.xml

4、字符串资源文件strings.xml

<resources>
    <string name="app_name">通过单选按钮切换碎片</string>    
    <string name="settings">设置</string>
    <string name="weixin">微信</string>
    <string name="address">通讯录</string>
    <string name="find_frd">找朋友</string>

    <string-array name="exit">
        <item>退出当前账号</item>
        <item>关闭微信</item>
    </string-array>
</resources>

5、创建单选按钮背景选择器配置文件

（1）微信按钮背景选择器配置文件

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

（2）通讯录按钮背景选择器配置文件

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

（3）找朋友按钮背景选择器配置文件

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

（4）设置按钮背景选择器配置文件

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

6、创建单选按钮文本选择器配置文件

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_checked="true" android:state_pressed="false" android:color="#00ff00"/>
    <item android:drawable="@mipmap/ic_launcher" android:color="#cccccc"/>
</selector>

7、创建微信碎片 - WeixinFragment

• 微信碎片布局 - fragment_wexin.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/root_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@drawable/weixin">

</LinearLayout>

• 微信碎片界面类WeixinFragment

package net.hw.switch_fragment;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.Toast;

import androidx.fragment.app.Fragment;

public class WeixinFragment extends Fragment {
    
    

    private LinearLayout rootLayout;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
    
    

        // 获取碎片视图
        View view = LayoutInflater.from(getActivity()).inflate(
                R.layout.fragment_weixin, null);

        // 通过资源索引获得控件实例
        rootLayout = (LinearLayout) view.findViewById(R.id.root_layout);

        // 给根布局注册监听器
        rootLayout.setOnClickListener(new View.OnClickListener() {
    
    
            @Override
            public void onClick(View v) {
    
    
                Toast.makeText(getActivity(), "哈哈，不是列表嘛！一张图片而已！", Toast.LENGTH_LONG).show();
            }
        });

        // 返回视图
        return view;
    }
}

8、创建通讯录碎片 - AddressFragment

• 通讯录碎片布局文件 - fragment_address.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/root_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@drawable/address" >

</LinearLayout>

• 通讯录碎片界面类 - AddressFragment

package net.hw.switch_fragment;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.Toast;

import androidx.fragment.app.Fragment;

public class AddressFragment extends Fragment {
    
    
    private LinearLayout rootLayout;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
    
    

        // 获取碎片视图
        View view = LayoutInflater.from(getActivity()).inflate(
                R.layout.fragment_address, null);

        // 通过资源索引获得控件实例
        rootLayout = (LinearLayout) view.findViewById(R.id.root_layout);

        // 给根布局注册监听器
        rootLayout.setOnClickListener(new View.OnClickListener() {
    
    

            @Override
            public void onClick(View v) {
    
    
                Toast.makeText(getActivity(), "哈哈，不是列表嘛！一张图片而已！", Toast.LENGTH_LONG).show();
            }
        });
        
        // 返回视图
        return view;
    }
}

9、创建找朋友碎片 - FindFrdFragment

• 找朋友碎片布局文件 - fragment_find_frd.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/root_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@drawable/find_frd" >

</LinearLayout>

• 找朋友碎片界面类 - FindFrdFragment

package net.hw.switch_fragment;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.Toast;

import androidx.fragment.app.Fragment;

public class FindFrdFragment extends Fragment {
    
    
    private LinearLayout rootLayout;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
    
    

        // 获取碎片视图
        View view = LayoutInflater.from(getActivity()).inflate(
                R.layout.fragment_find_frd, null);

        // 通过资源索引获得控件实例
        rootLayout = (LinearLayout) view.findViewById(R.id.root_layout);

        // 给根布局注册监听器
        rootLayout.setOnClickListener(new View.OnClickListener() {
    
    

            @Override
            public void onClick(View v) {
    
    
                Toast.makeText(getActivity(), "哈哈，不是列表嘛！一张图片而已！", Toast.LENGTH_LONG).show();
            }
        });

        // 返回视图
        return view;
    }
}

10、创建设置碎片 - SettingsFragment

• 设置碎片布局文件 - fragment_settings.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/root_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@drawable/settings">

</LinearLayout>

• 设置碎片界面类 - SettingsFragment

package net.hw.switch_fragment;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.Toast;

import androidx.fragment.app.Fragment;

public class SettingsFragment extends Fragment {
    
    
    private LinearLayout rootLayout;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
    
    

        // 获取碎片视图
        View view = LayoutInflater.from(getActivity()).inflate(
                R.layout.fragment_settings, null);

        // 通过资源索引获得控件实例
        rootLayout = (LinearLayout) view.findViewById(R.id.root_layout);

        // 给根布局注册监听器
        rootLayout.setOnClickListener(new View.OnClickListener() {
    
    

            @Override
            public void onClick(View v) {
    
    
                Toast.makeText(getActivity(), "哈哈，不是列表嘛！一张图片而已！", Toast.LENGTH_LONG).show();
            }
        });

        // 返回视图
        return view;
    }
}

11、主界面类 - MainActivity

package net.hw.switch_fragment;

import android.os.Bundle;
import android.widget.RadioGroup;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    
    

    private RadioGroup rgBottomBar;
    private WeixinFragment weixinFragment;
    private AddressFragment addressFragment;
    private FindFrdFragment findFrdFragment;
    private SettingsFragment settingsFragment;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    
    
        super.onCreate(savedInstanceState);
        // 利用布局资源文件设置用户界面
        setContentView(R.layout.activity_main);

        // 通过资源标识符获得控件实例
        rgBottomBar = (RadioGroup) findViewById(R.id.rg_bottom_bar);

        // 实例化碎片
        weixinFragment = new WeixinFragment();
        addressFragment = new AddressFragment();
        findFrdFragment = new FindFrdFragment();
        settingsFragment = new SettingsFragment();

        // 加载【微信】碎片
        getSupportFragmentManager().beginTransaction()
                .replace(R.id.rl_main_layout, weixinFragment).commit();

        // 给单选按钮组注册监听器
        rgBottomBar.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
    
    

            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
    
    
                switch (checkedId) {
    
    
                    case R.id.rb_weixin:
                        // 加载【微信】碎片
                        getSupportFragmentManager().beginTransaction()
                                .replace(R.id.rl_main_layout, weixinFragment).commit();
                        break;
                    case R.id.rb_address:
                        // 加载【通信录】碎片
                        getSupportFragmentManager().beginTransaction()
                                .replace(R.id.rl_main_layout, addressFragment).commit();
                        break;
                    case R.id.rb_find_frd:
                        // 加载【找朋友】碎片
                        getSupportFragmentManager().beginTransaction()
                                .replace(R.id.rl_main_layout, findFrdFragment).commit();
                        break;
                    case R.id.rb_setttings:
                        // 加载【设置】碎片
                        getSupportFragmentManager().beginTransaction()
                                .replace(R.id.rl_main_layout, settingsFragment).commit();
                        break;
                }
            }
        });
    }
}

12、启动应用，查看效果