一，在app下的build.gradle中添加如下引用
implementation 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.1.0'//mqtt相关
implementation 'org.eclipse.paho:org.eclipse.paho.android.service:1.1.1'//mqtt相关
implementation 'org.greenrobot:eventbus:3.1.1'//eventBus 为了传数据会UI界面
二，AndroidManifest.xml中添加权限
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
在application中添加如下代码
<service android:name="org.eclipse.paho.android.service.MqttService" /> <!--MqttService-->
<service android:name=".service.MyMqttService"/> <!--MyMqttService 自己写的服务 后面会讲-->
三，MyMqttService类
public class MyMqttService extends Service {
public final String TAG = MyMqttService.class.getSimpleName();
private static MqttAndroidClient mqttAndroidClient;
private MqttConnectOptions mMqttConnectOptions;
public String HOST = "tcp://192.168.101.115:1883";//服务器地址（协议+地址+端口号）
public String USERNAME = "admin";//用户名
public String PASSWORD = "admin";//密码
public static String PUBLISH_TOPIC = "tourist_enter";//发布主题
public static String RESPONSE_TOPIC = "message_arrived";//响应主题
public String CLIENTID = "zhangrenwen";
// public String CLIENTID = Build.VERSION.SDK_INT >= Build.VERSION_CODES.O
// ? Build.getSerial() : Build.SERIAL;//客户端ID，一般以客户端唯一标识符表示，这里用设备序列号表示
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
init();
return super.onStartCommand(intent, flags, startId);
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
/**
* 开启服务
*/
public static void startService(Context mContext) {
mContext.startService(new Intent(mContext, MyMqttService.class));
}
/**
* 发布 （模拟其他客户端发布消息）
*
* @param message 消息
*/
public static void publish(String message) {
String topic = PUBLISH_TOPIC;
Integer qos = 2;
Boolean retained = false;
try {
//参数分别为：主题、消息的字节数组、服务质量、是否在服务器保留断开连接后的最后一条消息
mqttAndroidClient.publish(topic, message.getBytes("GBK"), qos.intValue(), retained.booleanValue());
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 响应 （收到其他客户端的消息后，响应给对方告知消息已到达或者消息有问题等）
*
* @param message 消息
*/
public void response(String message) {
String topic = RESPONSE_TOPIC;
Integer qos = 2;
Boolean retained = false;
try {
//参数分别为：主题、消息的字节数组、服务质量、是否在服务器保留断开连接后的最后一条消息
mqttAndroidClient.publish(topic, message.getBytes(), qos.intValue(), retained.booleanValue());
} catch (MqttException e) {
e.printStackTrace();
}
}
/**
* 初始化
*/
private void init() {
String serverURI = HOST; //服务器地址（协议+地址+端口号）
mqttAndroidClient = new MqttAndroidClient(this, serverURI, CLIENTID);
mqttAndroidClient.setCallback(mqttCallback); //设置监听订阅消息的回调
mMqttConnectOptions = new MqttConnectOptions();
mMqttConnectOptions.setCleanSession(true); //设置是否清除缓存
mMqttConnectOptions.setConnectionTimeout(10); //设置超时时间，单位：秒
mMqttConnectOptions.setKeepAliveInterval(20); //设置心跳包发送间隔，单位：秒
mMqttConnectOptions.setUserName(USERNAME); //设置用户名
mMqttConnectOptions.setPassword(PASSWORD.toCharArray()); //设置密码
// last will message
boolean doConnect = true;
String message = "{\"terminal_uid\":\"" + CLIENTID + "\"}";
String topic = PUBLISH_TOPIC;
Integer qos = 2;
Boolean retained = false;
if ((!message.equals("")) || (!topic.equals(""))) {
// 最后的遗嘱
try {
mMqttConnectOptions.setWill(topic, message.getBytes(), qos.intValue(), retained.booleanValue());
} catch (Exception e) {
Log.i(TAG, "Exception Occured", e);
doConnect = false;
iMqttActionListener.onFailure(null, e);
}
}
if (doConnect) {
doClientConnection();
}
}
/**
* 连接MQTT服务器
*/
private void doClientConnection() {
if (!mqttAndroidClient.isConnected() && isConnectIsNomarl()) {
try {
mqttAndroidClient.connect(mMqttConnectOptions, null, iMqttActionListener);
} catch (MqttException e) {
e.printStackTrace();
}
}
}
/**
* 判断网络是否连接
*/
private boolean isConnectIsNomarl() {
ConnectivityManager connectivityManager = (ConnectivityManager) this.getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = connectivityManager.getActiveNetworkInfo();
if (info != null && info.isAvailable()) {
String name = info.getTypeName();
Log.i(TAG, "当前网络名称：" + name);
return true;
} else {
Log.i(TAG, "没有可用网络");
/*没有可用网络的时候，延迟3秒再尝试重连*/
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
doClientConnection();
}
}, 3000);
return false;
}
}
//MQTT是否连接成功的监听
private IMqttActionListener iMqttActionListener = new IMqttActionListener() {
@Override
public void onSuccess(IMqttToken arg0) {
Log.i(TAG, "连接成功 ");
try {
mqttAndroidClient.subscribe(PUBLISH_TOPIC, 2);//订阅主题，参数：主题、服务质量
} catch (MqttException e) {
e.printStackTrace();
}
}
@Override
public void onFailure(IMqttToken arg0, Throwable arg1) {
arg1.printStackTrace();
Log.i(TAG, "连接失败 ");
doClientConnection();//连接失败，重连（可关闭服务器进行模拟）
}
};
//订阅主题的回调
private MqttCallback mqttCallback = new MqttCallback() {
@Override
public void messageArrived(String topic, MqttMessage message) throws Exception {
Log.i(TAG, "收到消息： " + topic + new String(message.getPayload(),"GBK"));
EventBus.getDefault().post(new UpdateTextEvent(new String(message.getPayload(),"GBK")));
//收到消息，这里弹出Toast表示。如果需要更新UI，可以使用广播或者EventBus进行发送
// Toast.makeText(getApplicationContext(), "messageArrived: " + new String(message.getPayload()), Toast.LENGTH_LONG).show();
//收到其他客户端的消息后，响应给对方告知消息已到达或者消息有问题等
response("message arrived");
}
@Override
public void deliveryComplete(IMqttDeliveryToken arg0) {
}
@Override
public void connectionLost(Throwable arg0) {
Log.i(TAG, "连接断开 ");
doClientConnection();//连接断开，重连
}
};
@Override
public void onDestroy() {
try {
mqttAndroidClient.disconnect(); //断开连接
Log.i(TAG, "onDestroy: 服务关闭");
} catch (MqttException e) {
e.printStackTrace();
}
super.onDestroy();
}
}
四，封装数据bean类
public class UpdateTextEvent {
private static final String TAG = "AA";
private String msg;
public UpdateTextEvent(String msg) {
this.msg = msg;
Log.i(TAG, "updateTextEvent: " + msg);
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
}
五，activity_main.xml布局
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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"
tools:context=".MainActivity">
<EditText
android:id="@+id/editText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="发送"
app:layout_constraintTop_toBottomOf="@+id/editText"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
/>
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintTop_toBottomOf="@+id/button"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
/>
</android.support.constraint.ConstraintLayout>
六，MainActivity代码
public class MainActivity extends AppCompatActivity {
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText editText = findViewById(R.id.editText);
textView = findViewById(R.id.textView);
MyMqttService.startService(this); //开启服务
findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
MyMqttService.publish(editText.getText().toString());
}
});
}
/**
* 订阅的过程中，默认是在主线程中用到的
*/
@Subscribe(threadMode = ThreadMode.MAIN)
public void modifyBtn4(UpdateTextEvent msg) {
textView.setText("收到的消息："+msg.getMsg());
}
@Override
public void onStart() {
super.onStart();
//在事件被订阅的界面中注册EventBus
EventBus.getDefault().register(this);
}
@Override
public void onStop() {
super.onStop();
//注销EventBus
EventBus.getDefault().unregister(this);
}
}
至此 已经完毕 但是想要测试效果请联系后台
我们根据后台修改以下框框内容就好
QQ截图20190828151833.png
网友评论