android 中休眠问题？

bigbat 2019-06-04 09:38:48

最近在做android mqtt客户端的程序，利用 paho.mqtt.java.example例子修改出来的，虽然能够勉强运行。但是问题太多！
1、首相这个程序要是程序一启动开始就发消息，其它客户端就可以正常接受消息。但是屏幕一变黑就偶尔可以发过去，日志多次记录有重联的情况。
2、一旦启动后是开始发信息，接收就不正常。偶尔可以接收消息。
3、如果没有在启动后发信息，接收偶尔比较正常。大部分时间都会丢消息，日志，提示没有出现重联的记录
4、只要手机出现开始休眠的症状时，就是屏幕变暗时，无论什么情况收或是发都不正常。
5、屏幕彻底变黑后，只要唤醒，日志提示重联成功，但是收或发都是偶尔正常。
综上述：只有发送消息程序偶尔正常，其它情况都不正常。
从网上反馈的资料来看是由于android的休眠机制造成的。很多资料说明android的socket程序不好保活。
大家给点建议！
程序代码



/*******************************************************************************

 * Copyright (c) 1999, 2016 IBM Corp.

 *

 * All rights reserved. This program and the accompanying materials

 * are made available under the terms of the Eclipse Public License v1.0

 * and Eclipse Distribution License v1.0 which accompany this distribution.

 *

 * The Eclipse Public License is available at

 *    http://www.eclipse.org/legal/epl-v10.html

 * and the Eclipse Distribution License is available at

 *   http://www.eclipse.org/org/documents/edl-v10.php.

 *

 */

package paho.mqtt.java.example;



import android.os.Bundle;

import android.support.design.widget.FloatingActionButton;

import android.support.design.widget.Snackbar;

import android.support.v7.app.AppCompatActivity;

import android.support.v7.widget.LinearLayoutManager;

import android.support.v7.widget.RecyclerView;

import android.support.v7.widget.Toolbar;

import android.view.View;

import android.view.Menu;

import android.view.MenuItem;

import org.eclipse.paho.android.service.MqttAndroidClient;

import org.eclipse.paho.client.mqttv3.DisconnectedBufferOptions;

import org.eclipse.paho.client.mqttv3.IMqttActionListener;

import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;

import org.eclipse.paho.client.mqttv3.IMqttMessageListener;

import org.eclipse.paho.client.mqttv3.IMqttToken;

import org.eclipse.paho.client.mqttv3.MqttCallbackExtended;

import org.eclipse.paho.client.mqttv3.MqttConnectOptions;

import org.eclipse.paho.client.mqttv3.MqttException;

import org.eclipse.paho.client.mqttv3.MqttMessage;



import java.util.ArrayList;



public class PahoExampleActivity extends AppCompatActivity{

    private HistoryAdapter mAdapter;



    MqttAndroidClient mqttAndroidClient;



    final String serverUri = "tcp://192.168.1.103:1883";



    String clientId = "ExampleAndroidClient";

    final String subscriptionTopic = "HSLU/test";

    final String publishTopic = "HSLU/subtopic/relayA";

    final String publishMessage = "on";





    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_scrolling);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);

        setSupportActionBar(toolbar);



        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);

        fab.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View view) {

                publishMessage();

            }

        });





        RecyclerView mRecyclerView = (RecyclerView) findViewById(R.id.history_recycler_view);

        RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(this);

        mRecyclerView.setLayoutManager(mLayoutManager);



        mAdapter = new HistoryAdapter(new ArrayList<String>());

        mRecyclerView.setAdapter(mAdapter);



        clientId = clientId + System.currentTimeMillis();



        mqttAndroidClient = new MqttAndroidClient(getApplicationContext(), serverUri, clientId);

        mqttAndroidClient.setCallback(new MqttCallbackExtended() {

            @Override

            public void connectComplete(boolean reconnect, String serverURI) {



                if (reconnect) {

                    addToHistory("Reconnected to : " + serverURI);

                    // Because Clean Session is true, we need to re-subscribe

                    subscribeToTopic();

                } else {

                    addToHistory("Connected to: " + serverURI);

                }

            }



            @Override

            public void connectionLost(Throwable cause) {

                addToHistory("The Connection was lost.");

            }



            @Override

            public void messageArrived(String topic, MqttMessage message) throws Exception {

                addToHistory("Incoming message: " + new String(message.getPayload()));

            }



            @Override

            public void deliveryComplete(IMqttDeliveryToken token) {



            }

        });



        MqttConnectOptions mqttConnectOptions = new MqttConnectOptions();

        mqttConnectOptions.setAutomaticReconnect(true);

        mqttConnectOptions.setCleanSession(false);















        try {

            //addToHistory("Connecting to " + serverUri);

            mqttAndroidClient.connect(mqttConnectOptions, null, new IMqttActionListener() {

                @Override

                public void onSuccess(IMqttToken asyncActionToken) {

                    DisconnectedBufferOptions disconnectedBufferOptions = new DisconnectedBufferOptions();

                    disconnectedBufferOptions.setBufferEnabled(true);

                    disconnectedBufferOptions.setBufferSize(100);

                    disconnectedBufferOptions.setPersistBuffer(false);

                    disconnectedBufferOptions.setDeleteOldestMessages(false);

                    mqttAndroidClient.setBufferOpts(disconnectedBufferOptions);

                    subscribeToTopic();

                }



                @Override

                public void onFailure(IMqttToken asyncActionToken, Throwable exception) {

                    addToHistory("Failed to connect to: " + serverUri);

                }

            });





        } catch (MqttException ex){

            ex.printStackTrace();

        }



    }



    private void addToHistory(String mainText){

        System.out.println("LOG: " + mainText);

        mAdapter.add(mainText);

        Snackbar.make(findViewById(android.R.id.content), mainText, Snackbar.LENGTH_LONG)

                .setAction("Action", null).show();



    }



    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.



        return true;

    }



    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        // Handle action bar item clicks here. The action bar will

        // automatically handle clicks on the Home/Up button, so long

        // as you specify a parent activity in AndroidManifest.xml.

        int id = item.getItemId();



        //noinspection SimplifiableIfStatement



        return super.onOptionsItemSelected(item);

    }



    public void subscribeToTopic(){

        try {

            mqttAndroidClient.subscribe(subscriptionTopic, 0, null, new IMqttActionListener() {

                @Override

                public void onSuccess(IMqttToken asyncActionToken) {

                    addToHistory("Subscribed!");

                }



                @Override

                public void onFailure(IMqttToken asyncActionToken, Throwable exception) {

                    addToHistory("Failed to subscribe");

                }

            });



            // THIS DOES NOT WORK!

            mqttAndroidClient.subscribe(subscriptionTopic, 0, new IMqttMessageListener() {

                @Override

                public void messageArrived(String topic, MqttMessage message) throws Exception {

                    // message Arrived!

                    System.out.println("Message: " + topic + " : " + new String(message.getPayload()));

                }

            });



        } catch (MqttException ex){

            System.err.println("Exception whilst subscribing");

            ex.printStackTrace();

        }

    }



    public void publishMessage(){



        try {

            MqttMessage message = new MqttMessage();

            message.setPayload(publishMessage.getBytes());

            mqttAndroidClient.publish(publishTopic, message);

            addToHistory("Message Published");

            if(!mqttAndroidClient.isConnected()){

                addToHistory(mqttAndroidClient.getBufferedMessageCount() + " messages in buffer.");

            }

        } catch (MqttException e) {

            System.err.println("Error Publishing: " + e.getMessage());

            e.printStackTrace();

        }

    }



}