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Android Studio蓝牙通信和VLC网络播放器_android studio vlc 开发

作者：我家小花儿 | 2024-05-06 15:55:04

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android studio vlc 开发

一、新建项目

选择Navigation Drawer View Activity
在这里插入图片描述
在这里插入图片描述

二、安装依赖库

打开app目录下的build.gradle文件

plugins {
    id 'com.android.application'
}

android {
    namespace 'com.example.bluetoothled'
    compileSdk 33

    defaultConfig {
        applicationId "com.example.bluetoothled"
        minSdk 29
        targetSdk 33
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_11
        targetCompatibility JavaVersion.VERSION_11
    }
    buildFeatures {
        viewBinding true
    }
}

dependencies {

    implementation 'androidx.appcompat:appcompat:1.6.0'
    implementation 'com.google.android.material:material:1.8.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
    implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.5.1'
    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.5.1'
    implementation 'androidx.navigation:navigation-fragment:2.5.3'
    implementation 'androidx.navigation:navigation-ui:2.5.3'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
    implementation 'org.videolan.android:libvlc-all:3.4.4'
    implementation 'me.aflak.libraries:bluetooth:1.3.9'
}

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安装dependence{ }中的依赖库，具体版本可以根据自己的需求改变，但是有可能导致某些库报错。

三、编写布局文件

1.activity_main.xml文件

此文件主要最为目录导航页面，提供界面进行页面跳转。

<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout 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:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">

    <include
        android:id="@+id/app_bar_main"
        layout="@layout/app_bar_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />


    <com.google.android.material.navigation.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:fitsSystemWindows="true"
        app:headerLayout="@layout/nav_header_main"
        app:menu="@menu/activity_main_drawer" />
</androidx.drawerlayout.widget.DrawerLayout>

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在这里插入图片描述

2. app_bar.xml文件

此文件提供蓝牙连接活动按钮，进行蓝牙连接。并且此页面浮于content_main.xml文件之上。

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 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"
    tools:context=".MainActivity">

    <com.google.android.material.appbar.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/Theme.Bluetoothled.AppBarOverlay">

        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/Theme.Bluetoothled.PopupOverlay" >
        </androidx.appcompat.widget.Toolbar>
    </com.google.android.material.appbar.AppBarLayout>

    <include layout="@layout/content_main" />//导入content_main视图

    <CheckBox
        android:id="@+id/Bluetooth_state"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="130dp"
        android:layout_marginTop="50dp" />

    <CheckBox
        android:id="@+id/Focus_state"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="340dp"
        android:layout_marginTop="50dp" />

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_marginEnd="@dimen/fab_margin"
        android:layout_marginBottom="16dp"
        app:srcCompat="@drawable/bt" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>

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在这里插入图片描述

3. content_main.xml文件

提供文件导航

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:showIn="@layout/app_bar_main">

    <fragment
        android:id="@+id/nav_host_fragment_content_main"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:defaultNavHost="true"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:navGraph="@navigation/mobile_navigation" />
</androidx.constraintlayout.widget.ConstraintLayout>

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4. nav_header_main.xml文件

提供好看的导航背景

<?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"
    android:layout_width="match_parent"
    android:layout_height="@dimen/nav_header_height"
    android:background="@drawable/side_nav_bar"
    android:gravity="bottom"
    android:orientation="vertical"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:theme="@style/ThemeOverlay.AppCompat.Dark">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="105dp"
        android:layout_height="81dp"
        android:contentDescription="@string/nav_header_desc"
        android:paddingTop="@dimen/nav_header_vertical_spacing"
        app:srcCompat="@drawable/bt" />

</LinearLayout>

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5. fragmengt_m01_author.xml文件

主要操作界面布局，主要的蓝牙活动和VLC播放器都放在此页面，作为目录分级下的页面。

<?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=".ui.m01.Author.AuthorFragment">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="30dp"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:ellipsize="end"
            android:gravity="center"
            android:maxLines="1"
            android:text="蓝牙连接："
            android:textStyle="bold" />

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="30dp"
            android:layout_weight="1"
            android:gravity="center"
            android:paddingLeft="15dp"
            android:text="对焦状态："
            android:textStyle="bold" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:orientation="horizontal">

        <org.videolan.libvlc.util.VLCVideoLayout
            android:id = "@+id/videoLayout"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>
    </LinearLayout>




    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:orientation="horizontal"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal">



        <Button
            android:id="@+id/auto_focusing"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginLeft="10dp"
            android:text="自动对焦" />

        <Button
            android:id="@+id/up"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            android:text="上" />

        <Button
            android:id="@+id/manual_focusing"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginRight="10dp"

            android:text="手动对焦" />


    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal">

        <Button
            android:id="@+id/left"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginLeft="10dp"
            android:text="左" />

        <Button
            android:id="@+id/stop"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginLeft="10dp"
            android:text="停" />

        <Button
            android:id="@+id/right"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            android:text="右" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal">

        <Button
            android:id="@+id/pztneg"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginLeft="10dp"
            android:text="近"
            tools:ignore="TouchTargetSizeCheck" />

        <Button
            android:id="@+id/down"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginLeft="10dp"
            android:text="远" />


        <Button
            android:id="@+id/pztpos"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            android:text="近"
            tools:ignore="TouchTargetSizeCheck" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="59dp"
        android:orientation="horizontal">

        <Button
            android:id="@+id/slow_select"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_weight="1"

            android:text="慢"
            tools:ignore="TouchTargetSizeCheck" />

        <Button
            android:id="@+id/play"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_weight="1"
            android:text="播放"
            tools:ignore="TouchTargetSizeCheck" />

        <Button
            android:id="@+id/fast_select"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            android:layout_weight="1"
            android:text="快"
            tools:ignore="TouchTargetSizeCheck" />
    </LinearLayout>
</LinearLayout>

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四、编写java功能文件

1.MainActivity.java

此文件的主要功能为：
·连接蓝牙
·判断蓝牙连接状态
·根据返回状态打印

package com.example.bluetoothled;

import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;

import com.example.bluetoothled.databinding.FragmentM01AuthorBinding;
import com.example.bluetoothled.ui.m01.Author.AuthorFragment;
import com.example.bluetoothled.util.ByteReader;
import com.google.android.material.snackbar.Snackbar;
import com.google.android.material.navigation.NavigationView;

import androidx.lifecycle.ViewModelProvider;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.appcompat.app.AppCompatActivity;

import com.example.bluetoothled.databinding.ActivityMainBinding;
import me.aflak.bluetooth.Bluetooth;

public class MainActivity extends AppCompatActivity {

    private AppBarConfiguration mAppBarConfiguration;
    private ActivityMainBinding binding;


    MainViewModel mainModel;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mainModel= new ViewModelProvider(this).get(MainViewModel.class);
        binding = ActivityMainBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());

        setSupportActionBar(binding.appBarMain.toolbar);
        //Interlocking with the menu (navigation)
        DrawerLayout drawer = binding.drawerLayout;
        NavigationView navigationView = binding.navView;
        // Passing each menu ID as a set of Ids because each
        // menu should be considered as top level destinations.
        mAppBarConfiguration = new AppBarConfiguration.Builder(
                R.id.nav_author, R.id.nav_thinkercad, R.id.nav_wokwi,R.id.nav_proteus, R.id.nav_led, R.id.nav_joystick)
                .setOpenableLayout(drawer)
                .build();
        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_main);
        NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
        NavigationUI.setupWithNavController(navigationView, navController);

        permissionGranted();
        Bluetooth bluetooth = new Bluetooth(this);//1
        bluetooth.setReader(ByteReader.class); //Need to set Bluetooth byte reader //2
        mainModel.setBluetooth(bluetooth); //Received from mainModel Same as setting connect status information.

        Log.d("###","main.oncreate");


        binding.appBarMain.fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(mainModel.bluetooth.isConnected())
                    Snackbar.make(view, "HUAWEI_MATE_AF", Snackbar.LENGTH_LONG)
                            .setAction("Disconnect", v -> {
                                mainModel.bluetooth.disconnect();
                            }).show();
                else
                    Snackbar.make(view, "HUAWEI_MATE_AF", Snackbar.LENGTH_LONG)
                            .setAction("Connect", v->{
                                mainModel.bluetooth.connectToName("HUAWEI_MATE_AF");
                            }).show();
            }
        });

        mainModel.bluetoothStatus.observe(this, status->{
            Toast.makeText(this, status, Toast.LENGTH_SHORT).show();
            if(status.equals("Connected")) {
                mainModel.firmata.sendString(status);
                binding.appBarMain.BluetoothState.setChecked(true);
            }

            if (status.equals("received")){
                binding.appBarMain.FocusState.setChecked(true);
            }
        });
    }

    //3
    @Override
    protected void onStart() {
        super.onStart();
        mainModel.bluetooth.onStart();
    }
    //4
    @Override
    protected void onStop() {
        super.onStop();
        mainModel.bluetooth.onStop();
    }
    
    @Override
    public boolean onSupportNavigateUp() {
        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_main);
        return NavigationUI.navigateUp(navController, mAppBarConfiguration)
                || super.onSupportNavigateUp();
    }
    void permissionGranted() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
            requestPermissions(
                    new String[]{
                            android.Manifest.permission.BLUETOOTH,
                            android.Manifest.permission.BLUETOOTH_SCAN,
                            android.Manifest.permission.BLUETOOTH_ADVERTISE,
                            android.Manifest.permission.BLUETOOTH_CONNECT


                    },
                    1);//1是需要的
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            requestPermissions(
                    new String[]{
                            android.Manifest.permission.BLUETOOTH

                    },
                    1);//1是需要的
        }
    }
}

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2.MainViewModel.java

提供判断蓝牙连接状态函数，根据此文件返回值进行后续判断。

package com.example.bluetoothled;

import android.bluetooth.BluetoothDevice;

import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.ViewModel;

import com.example.bluetoothled.util.Firmata;
import com.example.bluetoothled.util.FirmataVersionData;

import me.aflak.bluetooth.Bluetooth;
import me.aflak.bluetooth.interfaces.DeviceCallback;

public class MainViewModel extends ViewModel {

   Bluetooth bluetooth;


  public Firmata firmata;
   public MutableLiveData<String> bluetoothStatus = new MutableLiveData<>();
   public MutableLiveData<FirmataVersionData> firmataVersionData = new MutableLiveData<>();
   public MainViewModel(){
       bluetoothStatus.setValue("Disconnected");
       firmataVersionData.setValue(new FirmataVersionData());
   }

   void setBluetooth(Bluetooth bluetooth){
       this.bluetooth = bluetooth;
       firmata =new Firmata(this.bluetooth);

       bluetooth.setDeviceCallback(new DeviceCallback() {
           @Override
           public void onDeviceConnected(BluetoothDevice device) {
               bluetoothStatus.postValue("Connected");

           }
           @Override
           public void onDeviceDisconnected(BluetoothDevice device, String message) {
               bluetoothStatus.postValue("Disconnected");
           }

           @Override
           public void onMessage(byte[] message) {
               bluetoothStatus.postValue("received");

           }

           @Override
           public void onError(int errorCode) {
               bluetoothStatus.postValue("Error");

           }

           @Override
           public void onConnectError(BluetoothDevice device, String message) {
               bluetoothStatus.postValue("Connect Error");

           }
       });

       firmata.attach((m,n)->{
           FirmataVersionData version = new FirmataVersionData();
           version.setMajor(m);
           version.setMinor(n);
           firmataVersionData.postValue(version);
       });
   }
    public Bluetooth getBluetooth(){

       return bluetooth;
   }

}


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3.AuthorFragment.java

定义了一些按钮和VLC视频播放器，主要收发功能在此实现。

package com.example.bluetoothled.ui.m01.Author;

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

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.ViewModelProvider;

import com.example.bluetoothled.MainViewModel;
import com.example.bluetoothled.R;
import com.example.bluetoothled.databinding.FragmentM01AuthorBinding;


import android.net.Uri;
import org.videolan.libvlc.LibVLC;
import org.videolan.libvlc.Media;
import org.videolan.libvlc.MediaPlayer;
import org.videolan.libvlc.util.VLCVideoLayout;


public class AuthorFragment extends Fragment {

    private FragmentM01AuthorBinding binding;
    AuthorViewModel Model;
    MainViewModel mainModel;

    //private static final String url = "http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4";
    private static final String url = "rtsp://192.168.1.3:554/";
    private LibVLC libVlc;
    private MediaPlayer mediaPlayer;
    private VLCVideoLayout videoLayout;

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

        Model = new ViewModelProvider(this).get(AuthorViewModel.class);
        mainModel = new ViewModelProvider(requireActivity()).get(MainViewModel.class);
        binding = FragmentM01AuthorBinding.inflate(inflater, container, false);



        return binding.getRoot();
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);



        libVlc = new LibVLC(requireActivity());
        mediaPlayer = new MediaPlayer(libVlc);
        videoLayout = view.findViewById(R.id.videoLayout);



        binding.up.setOnClickListener(v->{
            mainModel.firmata.sendSysex("u");
        });
        binding.down.setOnClickListener(v->{
            mainModel.firmata.sendSysex("d");
        });
        binding.left.setOnClickListener(v->{
            mainModel.firmata.sendSysex("l");
        });
        binding.right.setOnClickListener(v->{
            mainModel.firmata.sendSysex("r");
        });
        binding.stop.setOnClickListener(v->{
            mainModel.firmata.sendSysex("s");
        });


        binding.pztneg.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                if (event.getAction() == MotionEvent.ACTION_DOWN) {
                    // 按下时发送命令
                    mainModel.firmata.sendSysex("N");
                    Toast.makeText(getContext(),"pressed",Toast.LENGTH_SHORT).show();
                } else if (event.getAction() == MotionEvent.ACTION_UP) {
                    // 松开时发送命令
                    mainModel.firmata.sendSysex("T");
                    Toast.makeText(getContext(),"released",Toast.LENGTH_SHORT).show();
                }
                return false;
            }
        });

        binding.pztpos.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                if (event.getAction() == MotionEvent.ACTION_DOWN) {
                    // 按下时发送命令
                    mainModel.firmata.sendSysex("P");
                } else if (event.getAction() == MotionEvent.ACTION_UP) {
                    // 松开时发送命令
                    mainModel.firmata.sendSysex("T");
                }
                return false;
            }
        });

        binding.autoFocusing.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mainModel.firmata.sendSysex("a");
            }
        });

        binding.manualFocusing.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mainModel.firmata.sendSysex("m");
            }
        });


        binding.slowSelect.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mainModel.firmata.sendSysex("L");
                //bluetoothState.setChecked(true);
                //binding.BluetoothState.setChecked(true);
            }
        });

        binding.fastSelect.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mainModel.firmata.sendSysex("H");
            }
        });

        binding.play.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                startVideoPlayback();
            }
        });


    }

    private void startVideoPlayback() {
        mediaPlayer.attachViews(videoLayout, null, false, false);

        Media media = new Media(libVlc, Uri.parse(url));
        media.setHWDecoderEnabled(true, false);
        media.addOption(":network-caching=600");

        mediaPlayer.setMedia(media);
        media.release();
        mediaPlayer.play();
    }



    @Override
    public void onStop()
    {
        super.onStop();

        mediaPlayer.stop();
        mediaPlayer.detachViews();
    }

    @Override
    public void onDestroy()
    {
        super.onDestroy();

        mediaPlayer.release();
        libVlc.release();
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        binding = null;
    }


}

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4.AuthorViewModel.java

package com.example.bluetoothled.ui.m01.Author;

import androidx.lifecycle.LiveData;
import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.ViewModel;

public class AuthorViewModel extends ViewModel {

    private final MutableLiveData<String> mText;

    public AuthorViewModel() {
        mText = new MutableLiveData<>();
        mText.setValue("This is home fragment");
    }

    public LiveData<String> getText() {
        return mText;
    }
}

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总结

具体可以参考提供的项目文件，各个功能块之间分的比较清楚，能够容易看懂。
项目连接：链接：https://pan.baidu.com/s/1JkeSidV0jrrekTUAITEfwg?pwd=gi69
提取码：gi69

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