Use internal library for networking

net/.gitignore

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+/build

net/build.gradle

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+apply plugin: 'com.android.library'
+
+android {
+    compileSdkVersion rootProject.ext.compileSdkVersion
+    buildToolsVersion rootProject.ext.buildToolsVersion
+
+    defaultConfig {
+        minSdkVersion 16
+        targetSdkVersion 28
+        versionCode 1
+        versionName "1.0"
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+}

net/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

net/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.topjohnwu.net" />

net/src/main/java/com/topjohnwu/net/DownloadProgressListener.java

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+package com.topjohnwu.net;
+
+public interface DownloadProgressListener {
+    void onProgress(long bytesDownloaded, long totalBytes);
+}

net/src/main/java/com/topjohnwu/net/ErrorHandler.java

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+package com.topjohnwu.net;
+
+import java.net.HttpURLConnection;
+
+public interface ErrorHandler {
+    void onError(HttpURLConnection conn, Exception e);
+}

net/src/main/java/com/topjohnwu/net/Networking.java

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+package com.topjohnwu.net;
+
+import android.os.Handler;
+import android.os.Looper;
+
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.util.concurrent.ExecutorService;
+
+public class Networking {
+
+    private static final int READ_TIMEOUT = 15000;
+    private static final int CONNECT_TIMEOUT = 15000;
+    static Handler mainHandler = new Handler(Looper.getMainLooper());
+
+    private static Request request(String url, String method) {
+        try {
+            HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
+            conn.setRequestMethod(method);
+            conn.setReadTimeout(READ_TIMEOUT);
+            conn.setConnectTimeout(CONNECT_TIMEOUT);
+            return new Request(conn);
+        } catch (IOException e) {
+            return new StubRequest();
+        }
+    }
+
+    public static Request get(String url) {
+        return request(url, "GET");
+    }
+
+}

net/src/main/java/com/topjohnwu/net/ProgressInputStream.java

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+package com.topjohnwu.net;
+
+import java.io.FilterInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+public class ProgressInputStream extends FilterInputStream {
+
+    private long totalBytes;
+    private long bytesDownloaded;
+
+    public ProgressInputStream(InputStream in, long total) {
+        super(in);
+        totalBytes = total;
+    }
+
+    protected void updateProgress(long bytesDownloaded, long totalBytes) {}
+
+    private void update() {
+        Networking.mainHandler.post(() -> updateProgress(bytesDownloaded, totalBytes));
+    }
+
+    @Override
+    public int read() throws IOException {
+        int b = super.read();
+        if (b >= 0) {
+            bytesDownloaded++;
+            update();
+        }
+        return b;
+    }
+
+    @Override
+    public int read(byte[] b) throws IOException {
+        return read(b, 0, b.length);
+    }
+
+    @Override
+    public int read(byte[] b, int off, int len) throws IOException {
+        int sz = super.read(b, off, len);
+        if (sz > 0) {
+            bytesDownloaded += sz;
+            update();
+        }
+        return sz;
+    }
+}

net/src/main/java/com/topjohnwu/net/Request.java

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+package com.topjohnwu.net;
+
+import android.os.AsyncTask;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedOutputStream;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.FilterInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.Reader;
+import java.net.HttpURLConnection;
+import java.util.concurrent.Executor;
+
+public class Request {
+    private HttpURLConnection conn;
+    private Executor executor = null;
+    private DownloadProgressListener progress = null;
+    private ErrorHandler err = null;
+    private int code;
+
+    private interface Requestor<T> {
+        T request() throws Exception;
+    }
+
+    public class Result<T> {
+        T result;
+
+        public T getResult() {
+            return result;
+        }
+
+        public int getCode() {
+            return code;
+        }
+
+        public HttpURLConnection getConnection() {
+            return conn;
+        }
+    }
+
+    Request(HttpURLConnection c) {
+        conn = c;
+    }
+
+    public Request addHeaders(String key, String value) {
+        conn.setRequestProperty(key, value);
+        return this;
+    }
+
+    public Request setDownloadProgressListener(DownloadProgressListener listener) {
+        progress = listener;
+        return this;
+    }
+
+    public Request setErrorHandler(ErrorHandler handler) {
+        err = handler;
+        return this;
+    }
+
+    public Request setExecutor(Executor e) {
+        executor = e;
+        return this;
+    }
+
+    public Result<InputStream> execForInputStream() {
+        return exec(this::getInputStream);
+    }
+
+    public void getAsFile(ResponseListener<File> rs, File out) {
+        submit(() -> dlFile(out), rs);
+    }
+
+    public void execForFile(File out) {
+        exec(() -> dlFile(out));
+    }
+
+    public void getAsString(ResponseListener<String> rs) {
+        submit(this::dlString, rs);
+    }
+
+    public Result<String> execForString() {
+        return exec(this::dlString);
+    }
+
+    public void getAsJSONObject(ResponseListener<JSONObject> rs) {
+        submit(this::dlJSONObject, rs);
+    }
+
+    public Result<JSONObject> execForJSONObject() {
+        return exec(this::dlJSONObject);
+    }
+
+    public void getAsJSONArray(ResponseListener<JSONArray> rs) {
+        submit(this::dlJSONArray, rs);
+    }
+
+    public Result<JSONArray> execForJSONArray() {
+        return exec(this::dlJSONArray);
+    }
+
+    private <T> Result<T> exec(Requestor<T> req) {
+        Result<T> res = new Result<>();
+        try {
+            res.result = req.request();
+        } catch (Exception ignored) {}
+        return res;
+    }
+
+    private <T> void submit(Requestor<T> req, ResponseListener<T> rs) {
+        AsyncTask.THREAD_POOL_EXECUTOR.execute(() -> {
+            try {
+                T t = req.request();
+                Runnable cb = () -> rs.onResponse(t);
+                if (executor == null)
+                    Networking.mainHandler.post(cb);
+                else
+                    executor.execute(cb);
+            } catch (Exception e) {
+                if (err != null)
+                    err.onError(conn, e);
+            }
+        });
+    }
+
+    private BufferedInputStream getInputStream() throws IOException {
+        conn.connect();
+        code = conn.getResponseCode();
+        InputStream in = conn.getInputStream();
+        if (progress != null) {
+            in = new ProgressInputStream(in, conn.getContentLength()) {
+                @Override
+                protected void updateProgress(long bytesDownloaded, long totalBytes) {
+                    progress.onProgress(bytesDownloaded, totalBytes);
+                }
+
+                @Override
+                public void close() throws IOException {
+                    super.close();
+                    conn.disconnect();
+                }
+            };
+        } else {
+            in = new FilterInputStream(in) {
+                @Override
+                public void close() throws IOException {
+                    super.close();
+                    conn.disconnect();
+                }
+            };
+        }
+        return new BufferedInputStream(in);
+    }
+
+    private String dlString() throws IOException {
+        StringBuilder builder = new StringBuilder();
+        try (Reader reader = new InputStreamReader(getInputStream())) {
+            int len;
+            char buf[] = new char[4096];
+            while ((len = reader.read(buf)) != -1) {
+                builder.append(buf, 0, len);
+            }
+        }
+        return builder.toString();
+    }
+
+    private JSONObject dlJSONObject() throws IOException, JSONException {
+        return new JSONObject(dlString());
+    }
+
+    private JSONArray dlJSONArray() throws IOException, JSONException {
+        return new JSONArray(dlString());
+    }
+
+    private File dlFile(File f) throws IOException {
+        try (InputStream in  = getInputStream();
+             OutputStream out = new BufferedOutputStream(new FileOutputStream(f))) {
+            int len;
+            byte buf[] = new byte[4096];
+            while ((len = in.read(buf)) != -1) {
+                out.write(buf, 0, len);
+            }
+        }
+        return f;
+    }
+}

net/src/main/java/com/topjohnwu/net/ResponseListener.java

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+package com.topjohnwu.net;
+
+public interface ResponseListener<T> {
+    void onResponse(T response);
+}

net/src/main/java/com/topjohnwu/net/StubRequest.java

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+package com.topjohnwu.net;
+
+import org.json.JSONArray;
+import org.json.JSONObject;
+
+import java.io.File;
+import java.io.InputStream;
+import java.util.concurrent.Executor;
+
+class StubRequest extends Request {
+
+    StubRequest() { super(null); }
+
+    @Override
+    public Request addHeaders(String key, String value) { return this; }
+
+    @Override
+    public Request setDownloadProgressListener(DownloadProgressListener listener) { return this; }
+
+    @Override
+    public Request setErrorHandler(ErrorHandler handler) { return this; }
+
+    @Override
+    public Request setExecutor(Executor e) { return this; }
+
+    @Override
+    public Result<InputStream> execForInputStream() { return new Result<>(); }
+
+    @Override
+    public void getAsFile(ResponseListener<File> rs, File out) {}
+
+    @Override
+    public void getAsString(ResponseListener<String> rs) {}
+
+    @Override
+    public Result<String> execForString() { return new Result<>(); }
+
+    @Override
+    public void getAsJSONObject(ResponseListener<JSONObject> rs){}
+
+    @Override
+    public Result<JSONObject> execForJSONObject() { return new Result<>(); }
+
+    @Override
+    public void getAsJSONArray(ResponseListener<JSONArray> rs){}
+
+    @Override
+    public Result<JSONArray> execForJSONArray() { return new Result<>(); }
+}