Cronet Java wrappers to fallback to HttpUrlConnection if Cronet is not available.

net/cronet/android/java/src/org/chromium/net/ChromiumUrlRequestContext.java

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.net;
+
+import android.content.Context;
+import android.util.Log;
+
+/**
+ * Provides context for the native HTTP operations.
+ */
+public class ChromiumUrlRequestContext extends UrlRequestContext {
+    private static final Object sLock = new Object();
+
+    private static final String TAG = "ChromiumNetwork";
+
+    private static ChromiumUrlRequestContext sInstance;
+
+    private ChromiumUrlRequestContext(Context context, String userAgent,
+            int loggingLevel) {
+        super(context, userAgent, loggingLevel);
+    }
+
+    public static ChromiumUrlRequestContext getInstance(
+            Context context) {
+        synchronized (sLock) {
+            if (sInstance == null) {
+                int loggingLevel;
+                if (Log.isLoggable(TAG, Log.VERBOSE)) {
+                    loggingLevel = LOG_VERBOSE;
+                } else if (Log.isLoggable(TAG, Log.DEBUG)) {
+                    loggingLevel = LOG_DEBUG;
+                } else {
+                    loggingLevel = LOG_NONE;
+                }
+                sInstance = new ChromiumUrlRequestContext(
+                        context.getApplicationContext(),
+                        UserAgent.from(context),
+                        loggingLevel);
+            }
+        }
+        return sInstance;
+    }
+}