Android向：实现同一局域网内两台手机之间的文件互传

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Android向：实现同一局域网内两台手机之间的文件互传

2023-09-08 22:39| 来源: 网络整理| 查看: 265

背景

最近要做一个demo，目的是实现局域网内的两台手机之间的文件互传。具体流程如下：

手机 A 从服务器上下载一个 apk 文件到本机上；手机 A 在自己的某个端口上启动一个 Server 服务，供手机 B 对刚刚的 apk 进行下载；手机 B 请求手机 A 的 ip 地址与端口，进行 apk 的下载；

实现过程

目前只是一个最简版的实现。

1. 首先因为是下载服务，就在 app 里面动态申请了读写权限；

//读写权限 private static String[] PERMISSIONS_STORAGE = { Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE}; // 请求状态码 private static int REQUEST_PERMISSION_CODE = 1; // 动态申请读写权限 if (Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP) { if (ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(this, PERMISSIONS_STORAGE, REQUEST_PERMISSION_CODE); } }

2. 同样因为是下载服务，于是用了一个网络监听器对网络情况进行监听，但是还没有实现网络情况随时更改的监听；

public class NetworkStateReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { System.out.println("网路状态发生变化"); if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.LOLLIPOP) { ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo wifiNetworkInfo = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI); NetworkInfo dataNetworkInfo = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE); if (wifiNetworkInfo.isConnected() && dataNetworkInfo.isConnected()) { Toast.makeText(context, "Wifi 已连接，移动数据已连接", Toast.LENGTH_SHORT).show(); } else if (wifiNetworkInfo.isConnected() && !dataNetworkInfo.isConnected()){ Toast.makeText(context, "Wifi 已连接，移动数据尚未连接", Toast.LENGTH_SHORT).show(); } else if (!wifiNetworkInfo.isConnected() && dataNetworkInfo.isConnected()){ Toast.makeText(context, "Wifi 尚未连接，移动数据已连接", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(context, "Wifi 尚未连接，移动数据尚未连接", Toast.LENGTH_SHORT).show(); } } else { System.out.println("API level higher than 23"); ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); Network[] networks = manager.getAllNetworks(); StringBuilder sb = new StringBuilder(); Boolean result = false; if (networks.length > 0) { for (int i = 0; i < networks.length; i++) { NetworkInfo networkInfo = manager.getNetworkInfo(networks[i]); result |= (networkInfo.getType() == ConnectivityManager.TYPE_WIFI); sb.append(networkInfo.getTypeName() + " connect is " + networkInfo); } if (result) { Toast.makeText(context, "Wifi 已连接", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(context, "Wifi 尚未连接", Toast.LENGTH_SHORT).show(); } } else { Toast.makeText(context, "Wifi 尚未连接，移动数据尚未连接", Toast.LENGTH_SHORT).show(); } } } }

3. 手机 A 在这里主要设计了两个按钮，一个是从服务器端（此时手机 A 作为 client）的下载按钮，另外一个是提供给手机 B 的下载按钮（此时手机 A 作为 server）。

private void initView() { btDownload = findViewById(R.id.btn_downloadServer); btUpload = findViewById(R.id.btn_upload); tv = findViewById(R.id.textView); // client_content = findViewById(R.id.client_content); // ip = findViewById(R.id.ip); // // serverIp = IPUtils.getlocalip(MainActivity.this); // ip.setText("IP Address: " + serverIp); btUpload.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { HttpClientUtil httpClientUtil = new HttpClientUtil(); httpClientUtil.startServer(); } }); btDownload.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String url = "https://github.com/amirzaidi/Launcher3/releases/download/Pixel-v2.1/Launcher3-aosp-debug.apk"; String fPath = Environment.getExternalStorageDirectory() + File.separator + "Download"; String fName = "Launcher3-aosp-debug.apk"; if (NetworkUtils.isNetworkAvailable(MainActivity.this)){ if (!isFileExists(fPath, fName)){ new DownloadTask().execute(url, fPath, fName); } else { Toast.makeText(MainActivity.this, "文件已存在!", Toast.LENGTH_SHORT).show(); } } else{ Toast.makeText(MainActivity.this, "未接入网络!", Toast.LENGTH_SHORT).show(); } } }); }

4. 由于 android 的主线程只能用于更新 UI，所以这里的下载采用了 AsyncTask 的方法，并用一个 textView 来进行下载状态的更新。

private class DownloadTask extends AsyncTask { @Override protected void onPreExecute() { super.onPreExecute(); tv.setText("开始下载"); } @Override protected String doInBackground(String... params) { HttpConnectionUtil.downloadFile(params[0], params[1], params[2]); return "从服务器下载完成!"; } @Override protected void onPostExecute(String result) { tv.setText(result); }

5. 下载部分的代码使用的是 HttpURLConnection。

public class HttpConnectionUtil { public static Boolean downloadFile(String urlPath, String downloadDir, String fileName) { InputStream is; BufferedInputStream bis; URL url; HttpURLConnection httpURLConnection; File file; OutputStream fos; int code; try { url = new URL(urlPath); httpURLConnection = (HttpURLConnection) url.openConnection(); httpURLConnection.setRequestMethod("GET"); httpURLConnection.setRequestProperty("Charset", "UTF-8"); httpURLConnection.connect(); code = httpURLConnection.getResponseCode(); Log.e("Http Connection", code + ""); if (code == HttpURLConnection.HTTP_OK){ int fileLength = httpURLConnection.getContentLength(); is = httpURLConnection.getInputStream(); bis = new BufferedInputStream(is); String path = downloadDir + File.separatorChar + fileName; file = new File(path); if (!file.getParentFile().exists()) { file.getParentFile().mkdirs(); } fos = new FileOutputStream(file); int size; int len = 0; byte[] buf = new byte[1024]; while ((size = bis.read(buf)) != -1) { len += size; fos.write(buf, 0, size); } bis.close(); fos.close(); return len == fileLength; } else{ return false; } } catch (Exception e) { e.printStackTrace(); return false; } } }

6. 手机 A 作为 server 部分的代码则使用了开源库，此处待修改的是 server.get 的 regex 太过简单了，还有就是需要检测网络变化。

public class HttpClientUtil { private static String TAG = "HttpClientUtil"; private static final HttpClientUtil mInstance = new HttpClientUtil(); private AsyncHttpServer server = new AsyncHttpServer(); private int port = 5000; private boolean isRunning = false; private String ipAddress = ""; private String fPath = Environment.getExternalStorageDirectory() + File.separator + "Download"; private String fName = "Launcher3-aosp-debug.apk"; private boolean isNetworkConnect; public static HttpClientUtil getInstance() { return mInstance; } // private HttpClientUtil(Context context) { // // isNetworkConnect = NetworkUtils.isNetworkAvailable(context); // 目前尚未实现网络状态实时监测 // // if (isNetworkConnect) { // if (!isRunning) { // startServer(); // } // } else { // if (isRunning) { // stopServer(); // } // } // } public void startServer() { List _sockets = new ArrayList(); server.get("/", new HttpServerRequestCallback() { @Override public void onRequest(AsyncHttpServerRequest request, AsyncHttpServerResponse response) { File file = new File(fPath + File.separator + fName); response.sendFile(file); } }); server.listen(port); } public void stopServer() { if (isRunning) { return; } isRunning = false; ipAddress = ""; server.stop(); Log.d(TAG, "[stopServer] Server stopped!"); } }

7. 其他的一些小函数，isNetworkAvailable 与 getLocalIp。

public class NetworkUtils { public static boolean isNetworkAvailable(Context context){ ConnectivityManager manager = (ConnectivityManager) context.getApplicationContext() .getSystemService(Context.CONNECTIVITY_SERVICE); if (manager == null){ return false; } NetworkInfo networkInfo = manager.getActiveNetworkInfo(); if (networkInfo == null || !networkInfo.isConnected()){ return false; } return true; } } public class IPUtils { public static String getLocalIp(Context context) { WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE); WifiInfo wifiInfo = wifiManager.getConnectionInfo(); int ipAddress = wifiInfo.getIpAddress(); // Log.d(Tag, "int ip "+ipAddress); if (ipAddress == 0) return null; return ((ipAddress & 0xff) + "." + (ipAddress >> 8 & 0xff) + "." + (ipAddress >> 16 & 0xff) + "." + (ipAddress >> 24 & 0xff)); } }

实现效果

1. 手机 A 未开始下载时；