Google Drive REST API V3 > Root listing > Google Drive REST API V3 Getting Root Folder Id > List of Files & Folders From Root Directory

My target to listing all files of 'My Drive', but only the files and folders which are immediately below, not all the ones in the Drive at once. It's easy with REST API V3, below is a full code snippet to get listing of files and folders from ROOT FOLDER

package com.pkm; import java.io.*; import java.net.URL; import java.net.URLEncoder; import java.nio.charset.Charset; import java.nio.file.Files; import java.util.HashMap; import java.util.List; import java.util.Map; import sun.misc.BASE64Encoder; import com.google.gson.Gson; import javax.net.ssl.HttpsURLConnection; import javax.net.ssl.SSLContext; /** * Created by [PRITOM KUMAR] on 05-Oct-18. */ public class GoogleDriveRestApiV3 { public static void main(String[] args) throws Exception { /* I assumed you already have ACCESS TOKEN */ String AUTH_TOKEN = "ya29.GlwtBm__"; String FIELDS = "nextPageToken,files(id,name,mimeType,trashed,size,quotaBytesUsed)"; String QUERY = URLEncoder.encode( "'root' in parents " + "and trashed = false", "UTF-8" ); String URI = "https://www.googleapis.com/drive/v3/files?" + "fields=" + FIELDS + "&q=" + QUERY + "&access_token=" + AUTH_TOKEN; Map result = HttpJavaClient.doGet(URI); System.out.println(result); File outputFile = (File) result.get("outputFile"); if (outputFile != null) { String output = ""; List<String> lines = Files.readAllLines(outputFile.toPath(), Charset.defaultCharset()); for (String line : lines) { output = output + line; } Gson gson = new Gson(); Map data = gson.fromJson(output, Map.class); System.out.println(data); List<Map> files = (List<Map>) data.get("files"); for (Map map : files) { System.out.println(map); } } } public static String base64Encode(byte[] data) { BASE64Encoder base64Encoder = new BASE64Encoder(); return base64Encoder.encodeBuffer(data); } } class HttpJavaClient { public static enum Method { GET, POST, PUT, PATCH, DELETE } public static enum Type { XML, JSON, URL_ENCODED, HTTP; } public static Map doGet(String url) { return execute(url, Method.GET, "", Type.URL_ENCODED, null, null); } public static Map doPost(String url, String data, Type type, Map headers) { return execute(url, Method.POST, data, type, headers, null); } private static Map execute(String requestURL, Method requestMethod, String requestData, Type dataType, Map headers, Integer timeOutMilli) { String httpResponse = "", responseMessage = ""; Integer httpCode = 0; timeOutMilli = timeOutMilli == null ? 1000 * 30 : timeOutMilli; /* Default read & write timeout */ Map r = new HashMap(); HttpsURLConnection connection = null; try { String contentType = "", accept = "", contentLength = "" + requestData.length(); switch (dataType) { case XML: contentType = "text/xml; charset=utf-8"; accept = "text/xml"; break; case JSON: contentType = "application/json"; break; case URL_ENCODED: contentType = "application/x-www-form-urlencoded"; break; } connection = (HttpsURLConnection) new URL(requestURL).openConnection(); connection.setRequestMethod(requestMethod.name()); connection.setConnectTimeout(timeOutMilli); connection.setReadTimeout(timeOutMilli); connection.setRequestProperty("Pragma", "no-cache"); if (headers != null && headers.size() > 0) { for (Object name : headers.keySet().toArray()) { if (name.toString().endsWith("tls")) { //headers.put("tls", "TLSv1.2"); //headers.put("tls", "TLSv1"); SSLContext sc = SSLContext.getInstance(headers.get(name.toString()).toString()); sc.init(null, null, new java.security.SecureRandom()); connection.setSSLSocketFactory(sc.getSocketFactory()); } else { connection.setRequestProperty(name.toString(), headers.get(name.toString()).toString()); } } } if (requestData.length() > 0) { connection.setDoInput(true); connection.setDoOutput(true); if (accept.length() > 0) { connection.setRequestProperty("Accept", accept); } if (contentType.length() > 0) { connection.setRequestProperty("Content-Type", contentType); } connection.setRequestProperty("Content_length", contentLength); OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream(), "UTF-8"); writer.write(requestData); writer.flush(); writer.close(); } httpCode = connection.getResponseCode(); responseMessage = connection.getResponseMessage(); if (httpCode >= 200 && httpCode <= 299) { String responseContentType = connection.getContentType(); if (responseContentType == null || responseContentType.length() == 0) { responseContentType = "txt"; } else { if (responseContentType.contains(";")) { responseContentType = responseContentType.substring(0, responseContentType.indexOf(";")); } if (responseContentType.contains("text/html")) { responseContentType = "html"; } else if (responseContentType.contains("image/")) { responseContentType = "image"; } else if (responseContentType.contains("/")) { String[] parts = responseContentType.split("/"); responseContentType = parts[parts.length - 1]; } } Map<String, List<String>> map = connection.getHeaderFields(); for (Map.Entry<String, List<String>> entry : map.entrySet()) { System.out.println("Key=" + entry.getKey() + " ,Value=" + entry.getValue()); } System.out.println("Key=ResponseType ,Value=" + responseContentType); File tempFile = File.createTempFile("hello", ".tmp"); RandomAccessFile output = new RandomAccessFile(tempFile, "rw"); InputStream is = connection.getInputStream(); BufferedInputStream input = new BufferedInputStream(is); Integer fileLength = connection.getContentLength(); int readSize = 1024, downloadedSize = 0; byte data[] = new byte[readSize]; int count = 0; int progress = 0; Long timeNeeded = System.currentTimeMillis(); while ((count = input.read(data, 0, readSize)) >= 0 && progress != 100) { downloadedSize += count; output.write(data, 0, count); progress = (int) ((downloadedSize * 100) / fileLength); Long mb = output.length() / (1024 * 1024); System.out.println("PROGRESS = " + (progress) + "%, DOWNLOADED=" + mb + " MB, TYPE=" + responseContentType); } output.close(); input.close(); r.put("outputFile", tempFile); timeNeeded = (System.currentTimeMillis() - timeNeeded) / 1000; System.out.println("TIME REQUIRED=" + timeNeeded + " SECONDS!!!"); } } catch (Exception ex) { httpResponse = ""; responseMessage = ex.getMessage(); } finally { try { connection.disconnect(); } catch (Exception ex10) { } } r.put("code", httpCode); r.put("message", responseMessage); r.put("output", httpResponse); return r; } }

Below is output of above example:

Key=null ,Value=[HTTP/1.1 200 OK] Key=X-Frame-Options ,Value=[SAMEORIGIN] Key=Alt-Svc ,Value=[quic=":443"; ma=2592000; v="44,43,39,35"] Key=Vary ,Value=[X-Origin, Origin] Key=Date ,Value=[Fri, 05 Oct 2018 12:26:57 GMT] Key=Content-Length ,Value=[737] Key=X-XSS-Protection ,Value=[1; mode=block] Key=Expires ,Value=[Fri, 05 Oct 2018 12:26:57 GMT] Key=Content-Type ,Value=[application/json; charset=UTF-8] Key=Server ,Value=[GSE] Key=X-Content-Type-Options ,Value=[nosniff] Key=Cache-Control ,Value=[private, max-age=0, must-revalidate, no-transform] Key=ResponseType ,Value=json PROGRESS = 100%, DOWNLOADED=0 MB, TYPE=json TIME REQUIRED=0 SECONDS!!! {message=OK, outputFile=C:\Users\HP\AppData\Local\Temp\hello8652555977765600581.tmp, code=200, output=} {files=[{id=1KRehy6fX-6WwWi4AAERUklXki8EqwoWh, name=Mine.txt, mimeType=text/plain, trashed=false, size=7, quotaBytesUsed=7}, {id=12EC7CqD4gY3w9SGefvpO_VQQubWGZ_Vb, name=CORE-ITEMS, mimeType=application/vnd.google-apps.folder, trashed=false, quotaBytesUsed=0}, {id=1rGwUE6XV2hfmv0NamUI-sfpdSSERdZ0j, name=[RePack] Full Version Game.zip, mimeType=application/x-zip-compressed, trashed=false, size=4832867859, quotaBytesUsed=4832867859}]} {id=1KRehy6fX-6WwWi4AAERUklXki8EqwoWh, name=Mine.txt, mimeType=text/plain, trashed=false, size=7, quotaBytesUsed=7} {id=12EC7CqD4gY3w9SGefvpO_VQQubWGZ_Vb, name=CORE-ITEMS, mimeType=application/vnd.google-apps.folder, trashed=false, quotaBytesUsed=0} {id=1rGwUE6XV2hfmv0NamUI-sfpdSSERdZ0j, name=[RePack] Full Version Game.zip, mimeType=application/x-zip-compressed, trashed=false, size=4832867859, quotaBytesUsed=4832867859}

Java HttpURLConnection | HttpsURLConnection > Implement Pause / Resume in File Downloading > How to Extract Chunked Data When Using HttpURLConnection > Download File as Chunk

It's very important (as well as beneficial) if we can pause / resume our download specially when downloading big file.

Below is a code snippet to download data chunk by chunk. So you can now pause / resume your download whenever you want.

package com.pkm; import java.io.*; import java.net.HttpURLConnection; import java.net.URL; import java.util.List; import java.util.Map; public class JavaChunkDataDownload { public static enum Method { GET, POST, PUT, PATCH, DELETE } public static enum Type { XML, JSON, URL_ENCODED; }; private static String fileName = "file2.zip"; public static void main(String[] args) throws Exception { String URI = "http://ipv4.download.thinkbroadband.com/100MB.zip?t=" + System.currentTimeMillis(); //URI = "http://localhost/ForDownload.zip?t=" + System.currentTimeMillis(); Response response = execute(URI, Method.GET, "", Type.URL_ENCODED); println("Get_Result:\n" + lengthString(response.toString().replace("\n", ""), 400) + "..."); } public static Response execute(String url, Method method, String data, Type type) { return execute(url, method, data, type, null, null); } private static Response execute(String requestURL, Method requestMethod, String requestData, Type dataType, Map headers, Integer timeOutMilli) { Long started = System.currentTimeMillis(); String httpResponse = "", responseMessage = ""; Integer httpCode = 0; timeOutMilli = timeOutMilli == null ? 1000 * 30 : timeOutMilli; /* Default read & write timeout */ HttpURLConnection connection = null; try { String contentType = "", accept = "", contentLength = "" + requestData.length(); switch (dataType) { case XML: contentType = "text/xml; charset=utf-8"; accept = "text/xml"; break; case JSON: contentType = "application/json"; break; case URL_ENCODED: contentType = "application/x-www-form-urlencoded"; break; } connection = (HttpURLConnection) new URL(requestURL).openConnection(); connection.setRequestMethod(requestMethod.name()); connection.setConnectTimeout(timeOutMilli); connection.setReadTimeout(timeOutMilli); connection.setRequestProperty("Pragma", "no-cache"); connection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36"); File outputFileCache = new File(fileName); if (outputFileCache.exists()) { connection.setAllowUserInteraction(true); connection.setRequestProperty("Range", "bytes=" + outputFileCache.length() + "-"); } if (headers != null && headers.size() > 0) { for (Object name : headers.keySet().toArray()) { connection.setRequestProperty(name.toString(), headers.get(name.toString()).toString()); } } if (requestData.length() > 0) { connection.setDoInput(true); connection.setDoOutput(true); if (accept.length() > 0) { connection.setRequestProperty("Accept", accept); } if (contentType.length() > 0) { connection.setRequestProperty("Content-Type", contentType); } connection.setRequestProperty("Content_length", contentLength); OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream(), "UTF-8"); writer.write(requestData); writer.flush(); writer.close(); } httpCode = connection.getResponseCode(); Boolean validResponse = httpCode >= 200 && httpCode <= 299; responseMessage = connection.getResponseMessage(); String responseContentType = connection.getContentType(); if (responseContentType == null || responseContentType.length() == 0) { responseContentType = "txt"; } else { if (responseContentType.contains(";")) { responseContentType = responseContentType.substring(0, responseContentType.indexOf(";")); } if (responseContentType.contains("text/html")) { responseContentType = "html"; } else if (responseContentType.contains("image/")) { responseContentType = "image"; } else if (responseContentType.contains("/")) { String[] parts = responseContentType.split("/"); responseContentType = parts[parts.length - 1]; } } Map<String, List<String>> map = connection.getHeaderFields(); for (Map.Entry<String, List<String>> entry : map.entrySet()) { System.out.println("Key : " + entry.getKey() + " ,Value : " + entry.getValue()); } if (validResponse) { Long downloadedSize = 0L; String connectionField = connection.getHeaderField("content-range"); if (connectionField != null) { String[] connectionRanges = connectionField.substring("bytes=".length()).split("-"); downloadedSize = Long.valueOf(connectionRanges[0]); } if (connectionField == null && outputFileCache.exists()) { outputFileCache.delete(); } outputFileCache = new File(fileName); if (!outputFileCache.exists()) { outputFileCache.createNewFile(); outputFileCache.setExecutable(true); } Long fileLength = connection.getContentLength() + downloadedSize; RandomAccessFile output = new RandomAccessFile(outputFileCache, "rw"); output.seek(downloadedSize); InputStream is = connection.getInputStream(); BufferedInputStream input = new BufferedInputStream(is); int readSize = 1024; byte data[] = new byte[readSize]; int count = 0; int progress = 0; Integer pauseAt = 180; Long timeNeeded = System.currentTimeMillis(); while ((count = input.read(data, 0, readSize)) >= 0 && progress != 100) { downloadedSize += count; output.write(data, 0, count); progress = (int) ((downloadedSize * 100) / fileLength); Long mb = output.length() / (1024 * 1024); System.out.println("PROGRESS = " + (progress) + "%, DOWNLOADED=" + mb + " MB, TYPE=" + responseContentType); if (progress >= pauseAt) { break; } } output.close(); input.close(); timeNeeded = (System.currentTimeMillis() - timeNeeded) / 1000; System.out.println("TIME REQUIRED=" + timeNeeded); } } catch (Exception ex) { httpResponse = ""; responseMessage = ex.getMessage(); } finally { try { connection.disconnect(); } catch (Exception ex10) { } } return new Response(requestURL, httpCode, responseMessage, httpResponse, (System.currentTimeMillis() - started)); } public static class Response { private String url; private Integer code; private String message; private String body; private Long time; public Response(String url, Integer code, String message, String body, Long time) { this.url = url; this.code = code; this.message = message; this.body = body; this.time = time; } @Override public String toString() { return "{URL=" + this.url + ",Code=" + this.code + ", Message=" + this.message + ", Time=" + this.time + " Millis, Body=" + this.body + "}"; } public Integer getCode() { return this.code; } public String getMessage() { return this.message; } public String getBody() { return this.body; } public Long getTime() { return this.time; } } public static void println(Object o) { System.out.println("" + o); } public static String lengthString(String s, Integer m) { return s.length() > m ? s.substring(0, m) : s; } }

Google Drive REST API V3 > Upload / Insert / Create Files Into Google Drive

So the very first step to upload a file to google drive using REST API V3, you need to create a project into your google account, then create a API key / value pair to authorize your application. Follow below link to create your application and authorize your application: CLICK HERE FOR MORE DETAILS So at this stage, I assumed that you already have ACCESS KEY, which is the only thing when you communicate with Google REST API. Below are some code snippet written in JAVA to upload files into GOOGLE DRIVE, you can do that same in other language, because I am not using any CLIENT LIBRARY, it's RAW REST API

The below link is GOOGLE DRIVE REST API V3 documentation link CLICK HERE FOR MORE DETAILS BELOW IS A FULL CODE SNIPPET TO UPLOAD/CREATE A FILE INTO GOODLE DRIVE USING REST API V3

package com.pkm; import java.io.*; import java.net.URL; import java.nio.charset.Charset; import java.nio.file.Files; import java.util.HashMap; import java.util.List; import java.util.Map; import sun.misc.BASE64Encoder; import javax.net.ssl.HttpsURLConnection; import javax.net.ssl.SSLContext; /** * Created by [PRITOM KUMAR] on 05-Oct-18. */ public class GoogleDriveFileUpload { public static void main(String[] args) throws Exception { /* I assumed you already have ACCESS TOKEN */ String AUTH_TOKEN = "ya29...………….._BmTq3YOBNmQ"; /* Collect your bytes from any file */ byte[] content = "SUCCEED".getBytes(Charset.defaultCharset()); /* JSON ENCODED PARAMS [name: 'Mine.txt', mimeType: 'text/plain'] */ String params = "{\"name\":\"Mine.txt\",\"mimeType\":\"text\\/plain\"}"; String boundary = "=====" + System.currentTimeMillis() + "============"; String postBody = "--" + boundary + "\n" + "Content-Type: application/json; charset=UTF-8\n\n\n" + params + "\n" + "--" + boundary + "\n" + "Content-Type: text/plain\n" + "Content-Transfer-Encoding: base64\n\n\n" + base64Encode(content) + "\n--" + boundary + "--"; String URI = "https://www.googleapis.com/upload/drive/v3/files?uploadType=multipart"; Map headers = new HashMap(); headers.put("content-type", "multipart/related; boundary=" + boundary); headers.put("Content-Transfer-Encoding", "binary"); headers.put("MIME-Version", "1.0"); headers.put("Authorization", "Bearer " + AUTH_TOKEN); Map result = HttpJavaClient.doPost(URI, postBody, HttpJavaClient.Type.HTTP, headers); System.out.println(result); File outputFile = (File) result.get("outputFile"); if (outputFile != null) { List<String> lines = Files.readAllLines(outputFile.toPath(), Charset.defaultCharset()); for (String line : lines) { System.out.println(line); } } } public static String base64Encode(byte[] data) { BASE64Encoder base64Encoder = new BASE64Encoder(); return base64Encoder.encodeBuffer(data); } } class HttpJavaClient { public static enum Method { GET, POST, PUT, PATCH, DELETE } public static enum Type { XML, JSON, URL_ENCODED, HTTP; } public static Map doPost(String url, String data, Type type, Map headers) { return execute(url, Method.POST, data, type, headers, null); } private static Map execute(String requestURL, Method requestMethod, String requestData, Type dataType, Map headers, Integer timeOutMilli) { String httpResponse = "", responseMessage = ""; Integer httpCode = 0; timeOutMilli = timeOutMilli == null ? 1000 * 30 : timeOutMilli; /* Default read & write timeout */ Map r = new HashMap(); HttpsURLConnection connection = null; try { String contentType = "", accept = "", contentLength = "" + requestData.length(); switch (dataType) { case XML: contentType = "text/xml; charset=utf-8"; accept = "text/xml"; break; case JSON: contentType = "application/json"; break; case URL_ENCODED: contentType = "application/x-www-form-urlencoded"; break; } connection = (HttpsURLConnection) new URL(requestURL).openConnection(); connection.setRequestMethod(requestMethod.name()); connection.setConnectTimeout(timeOutMilli); connection.setReadTimeout(timeOutMilli); connection.setRequestProperty("Pragma", "no-cache"); if (headers != null && headers.size() > 0) { for (Object name : headers.keySet().toArray()) { if (name.toString().endsWith("tls")) { //headers.put("tls", "TLSv1.2"); //headers.put("tls", "TLSv1"); SSLContext sc = SSLContext.getInstance(headers.get(name.toString()).toString()); sc.init(null, null, new java.security.SecureRandom()); connection.setSSLSocketFactory(sc.getSocketFactory()); } else { connection.setRequestProperty(name.toString(), headers.get(name.toString()).toString()); } } } if (requestData.length() > 0) { connection.setDoInput(true); connection.setDoOutput(true); if (accept.length() > 0) { connection.setRequestProperty("Accept", accept); } if (contentType.length() > 0) { connection.setRequestProperty("Content-Type", contentType); } connection.setRequestProperty("Content_length", contentLength); OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream(), "UTF-8"); writer.write(requestData); writer.flush(); writer.close(); } httpCode = connection.getResponseCode(); responseMessage = connection.getResponseMessage(); if (httpCode >= 200 && httpCode <= 299) { String responseContentType = connection.getContentType(); if (responseContentType == null || responseContentType.length() == 0) { responseContentType = "txt"; } else { if (responseContentType.contains(";")) { responseContentType = responseContentType.substring(0, responseContentType.indexOf(";")); } if (responseContentType.contains("text/html")) { responseContentType = "html"; } else if (responseContentType.contains("image/")) { responseContentType = "image"; } else if (responseContentType.contains("/")) { String[] parts = responseContentType.split("/"); responseContentType = parts[parts.length - 1]; } } Map<String, List<String>> map = connection.getHeaderFields(); for (Map.Entry<String, List<String>> entry : map.entrySet()) { System.out.println("Key=" + entry.getKey() + " ,Value=" + entry.getValue()); } System.out.println("Key=ResponseType ,Value=" + responseContentType); File tempFile = File.createTempFile("hello", ".tmp"); RandomAccessFile output = new RandomAccessFile(tempFile, "rw"); InputStream is = connection.getInputStream(); BufferedInputStream input = new BufferedInputStream(is); Integer fileLength = connection.getContentLength(); int readSize = 1024, downloadedSize = 0; byte data[] = new byte[readSize]; int count = 0; int progress = 0; Long timeNeeded = System.currentTimeMillis(); while ((count = input.read(data, 0, readSize)) >= 0 && progress != 100) { downloadedSize += count; output.write(data, 0, count); progress = (int) ((downloadedSize * 100) / fileLength); Long mb = output.length() / (1024 * 1024); System.out.println("PROGRESS = " + (progress) + "%, DOWNLOADED=" + mb + " MB, TYPE=" + responseContentType); } output.close(); input.close(); r.put("outputFile", tempFile); timeNeeded = (System.currentTimeMillis() - timeNeeded) / 1000; System.out.println("TIME REQUIRED=" + timeNeeded + " SECONDS!!!"); } } catch (Exception ex) { httpResponse = ""; responseMessage = ex.getMessage(); } finally { try { connection.disconnect(); } catch (Exception ex10) { } } r.put("code", httpCode); r.put("message", responseMessage); r.put("output", httpResponse); return r; } }

And output / response from GOOGLE DRIVE REST API V3 is as below:

{ "kind": "drive#file", "id": "1KRehy6fX-6WwWi4AAERUklXki8EqwoWh", "name": "Mine.txt", "mimeType": "text/plain" }

Emulator: ERROR: x86 emulation currently requires hardware acceleration

I tried to run my Hello World application in Android Studio. I got the following error:

* Emulator: ERROR: x86 emulation currently requires hardware acceleration! * Please ensure Intel HAXM is properly installed and usable. * CPU acceleration status: HAX kernel module is not installed!

So solution is as below:

* Open SDK Manager (In Android Studio, go to Tools > Android > SDK Manager) and Download Intel x86 Emulator Accelerator (HAXM installer) if you haven't. * Now go to your SDK directory C:\users\%USERNAME%\AppData\Local\Android\sdk\extras\intel\Hardware_Accelerated_Execution_Manager\ and run the file named intelhaxm-android.exe. * In case you get an error like "Intel virtualization technology (vt,vt-x) is not enabled". Go to your BIOS settings and enable Hardware Virtualization. * Restart Android Studio and then try to start the AVD again.