好的，所以我需要介绍一些背景知识。首先，我将 jquery-mobile 与 PhoneGap 1.7 一起使用。 我编写了一个使用 ServerSocket 对象的非常简单的 Java 服务器。在 Android 手机上，我连接到服务器，然后服务器通过套接字发送数据。这部分正在运行。
我坚持的部分是我打算通过该套接字发送数据，这将需要在接收到数据时更新 jquery 移动 UI。
答案:西蒙帮了大忙，我在他的帮助下解决了这个问题，并关注了this tutorial
真正打动我的部分是在 PhoneGap 插件本身中生成线程。一旦我意识到这一点，一切都水到渠成。但是，对于任何感兴趣的人来说，这里是代码。请记住，我从教程中学到了很多东西。我还包含了为测试这些概念而创建的非常简单的 Java 服务器。我想也许这会在将来帮助某人。请记住，这基本上是一个概念证明。
我需要修改这个插件以满足我的实际需要:
Android Activity : 导入 org.apache.cordova.DroidGap;
import android.os.Bundle;
public class ISSAndroidActivity extends DroidGap {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.loadUrl("file:///android_asset/www/index.html");
}
}
PhoneGap 插件:
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.SocketException;
import org.apache.cordova.api.*;
import org.apache.cordova.api.PluginResult;
import org.apache.cordova.api.PluginResult.Status;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class InvokeJavaScriptPlugin extends Plugin {
public static String PLUGIN_TAG = "InvokeJavaScriptPlugin";
public static String PROCESS_DATA_ACTION = "processData";
private String callBackId = "";
@Override
public PluginResult execute(String action, JSONArray args, String callbackId) {
PluginResult pluginResult = null;
Log.d(PLUGIN_TAG, "Invoking Javascript w\\ NO_RESULT");
if (action.equals(PROCESS_DATA_ACTION)) {
this.callBackId = callbackId;
startProcessingData();
pluginResult = new PluginResult(Status.NO_RESULT);
pluginResult.setKeepCallback(true);
} else {
pluginResult = new PluginResult(Status.INVALID_ACTION);
Log.e(PLUGIN_TAG, "Invalid action : " + action);
}
return pluginResult;
}
/**
* Spawns a thread that connects to a server, and receives data from it
*/
private void startProcessingData() {
new Thread() {
@Override
public void run() {
// Socket Testing
ObjectOutputStream out;
ObjectInputStream in;
Socket requestSocket = new Socket();
Object inboundObject;
SocketAddress ipAddr = new InetSocketAddress("192.168.1.2",
2012);
try {
requestSocket.connect(ipAddr);
out = new ObjectOutputStream(
requestSocket.getOutputStream());
out.flush();
in = new ObjectInputStream(requestSocket.getInputStream());
do {
inboundObject = in.readObject(); // Data is received
// here
int processedData = ((Number) inboundObject).intValue();
onProcessDataReadSuccess(processedData);
} while (requestSocket.isConnected());
} catch (SocketException ex) {
Log.d(PLUGIN_TAG, "Connection to Server lost");
} catch (Exception ex) {
ex.printStackTrace();
}
}
}.start();
}
/**
* Callback method for startProcessingData(). Sends the result up to
* javascript layer via Plugin.success()<br>
* This method is automatically called asynchronously when processing is
* finished.
*
* @param processedData
* the result of data processing which will be passed back to
* javascript.
*/
private void onProcessDataReadSuccess(int processedData) {
Log.d(PLUGIN_TAG, "Processing data: " + processedData);
PluginResult result;
try {
JSONObject resultJSON = new JSONObject();
resultJSON.put("processedData", processedData);
result = new PluginResult(Status.OK, resultJSON);
} catch (JSONException jsonEx) {
Log.e(PLUGIN_TAG, "Got JSON Exception " + jsonEx.getMessage());
jsonEx.printStackTrace();
result = new PluginResult(Status.JSON_EXCEPTION);
}
result.setKeepCallback(true);
this.success(result, this.callBackId);
}
}
index.html:
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
<link type="text/css" href="css/jquery.mobile-1.1.0.min.css"
rel="stylesheet" />
</head>
<script type="text/javascript" charset="utf-8"
src="scripts/cordova-1.7.0.js"></script>
<script type="text/javascript" src="scripts/jquery-1.7.2.min.js"></script>
<script type="text/javascript" src="scripts/jquery.mobile-1.1.0.min.js"></script>
<script type="text/javascript" src="scripts/InvokeJavaScript.js"></script>
<script type="text/javascript" charset="utf-8">
document.addEventListener('deviceready', function() {
window.plugins.InvokeJavaScript.processData(function(result) {
displayProcessedData(result)
}, function(error) {
console.log(error)
});
}, true);
function displayProcessedData(result) {
document.getElementById("processedData").innerHTML = result.processedData;
}
</script>
<body>
<div data-role="page">
<div data-role="header" data-position="fixed">
<h1>Demo</h1>
</div>
<div data-role="content">
Result:
<div id="processedData"></div>
</div>
<div data-role="footer" data-position="fixed">
<div data-role="navbar"></div>
</div>
</div>
</body>
</html>
服务器.java
import java.io.BufferedReader;
import java.io.ObjectOutputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class ISSServer {
private static Socket androidSocket;
private static ServerSocket serverSocket;
static ObjectOutputStream out;
static BufferedReader in;
public static void main(String[] args) {
System.out.println("Listen Thread: Waiting for connection");
int port_number = 2012; // The default port
try {
serverSocket = new ServerSocket(port_number);
androidSocket = serverSocket.accept();
System.out.println("Connection established");
out = new ObjectOutputStream(androidSocket.getOutputStream());
out.flush();
// in = new BufferedReader(new
// InputStreamReader(androidSocket.getInputStream()));
out.writeObject(1337);
out.flush();
out.reset();
System.out.println("1337 sent");
Thread.sleep(2000);
out.writeObject(9999);
out.flush();
out.reset();
System.out.println("9999 sent");
Thread.sleep(2000);
out.writeObject(1234);
out.flush();
out.reset();
System.out.println("1234 sent");
Thread.sleep(2000);
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
请您参考如下方法:
你这样做是在折磨自己。如果您使用 PhoneGap 插件，您将能够保存初始 JavaScript 调用的回调 ID，然后发回您调用 result.setKeepCallback(true) 的 PluginResult 以及状态 PluginResult.Status.NO_RESULT。
然后，每当您在 Java 端获取和更新时，您都会创建一个新的 PluginResult。将状态设置为 OK，将数据设置为您想要发送的任何内容，当然在返回之前设置 KeepCallback(true)。然后调用 this.success(callbackId, result)，你的 JS 端将得到持续更新。
