Added Native-JS bridge mode that uses private WebView APIs.
Project: http://git-wip-us.apache.org/repos/asf/incubator-cordova-android/repo Commit: http://git-wip-us.apache.org/repos/asf/incubator-cordova-android/commit/bbafe53a Tree: http://git-wip-us.apache.org/repos/asf/incubator-cordova-android/tree/bbafe53a Diff: http://git-wip-us.apache.org/repos/asf/incubator-cordova-android/diff/bbafe53a Branch: refs/heads/master Commit: bbafe53a2b667990b85b56f50899771edc04a50c Parents: e239fd9 Author: Andrew Grieve <agri...@chromium.org> Authored: Tue Aug 21 20:45:59 2012 -0400 Committer: Andrew Grieve <agri...@chromium.org> Committed: Wed Aug 22 09:46:30 2012 -0400 ---------------------------------------------------------------------- .../org/apache/cordova/NativeToJsMessageQueue.java | 79 +++++++++++++-- 1 files changed, 70 insertions(+), 9 deletions(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/incubator-cordova-android/blob/bbafe53a/framework/src/org/apache/cordova/NativeToJsMessageQueue.java ---------------------------------------------------------------------- diff --git a/framework/src/org/apache/cordova/NativeToJsMessageQueue.java b/framework/src/org/apache/cordova/NativeToJsMessageQueue.java index e9f093a..9ba1562 100755 --- a/framework/src/org/apache/cordova/NativeToJsMessageQueue.java +++ b/framework/src/org/apache/cordova/NativeToJsMessageQueue.java @@ -18,11 +18,17 @@ */ package org.apache.cordova; +import java.lang.reflect.Field; +import java.lang.reflect.InvocationTargetException; +import java.lang.reflect.Method; +import java.util.ArrayList; import java.util.LinkedList; import org.apache.cordova.api.CordovaInterface; +import android.os.Message; import android.util.Log; +import android.webkit.WebView; /** * Holds the list of messages to be sent to the WebView. @@ -54,17 +60,13 @@ public class NativeToJsMessageQueue { public NativeToJsMessageQueue(CordovaWebView webView, CordovaInterface cordova) { this.cordova = cordova; this.webView = webView; - registeredListeners = new BridgeMode[4]; - registeredListeners[0] = null; + registeredListeners = new BridgeMode[5]; + registeredListeners[0] = null; // Polling. Requires no logic. registeredListeners[1] = new CallbackBridgeMode(); registeredListeners[2] = new LoadUrlBridgeMode(); registeredListeners[3] = new OnlineEventsBridgeMode(); + registeredListeners[4] = new PrivateApiBridgeMode(); reset(); -// POLLING: 0, -// HANGING_GET: 1, -// LOAD_URL: 2, -// ONLINE_EVENT: 3, -// PRIVATE_API: 4 } /** @@ -167,14 +169,14 @@ public class NativeToJsMessageQueue { } /** Uses webView.loadUrl("javascript:") to execute messages. */ - public class LoadUrlBridgeMode implements BridgeMode { + private class LoadUrlBridgeMode implements BridgeMode { public void onNativeToJsMessageAvailable() { webView.loadUrlNow("javascript:" + popAll()); } } /** Uses online/offline events to tell the JS when to poll for messages. */ - public class OnlineEventsBridgeMode implements BridgeMode { + private class OnlineEventsBridgeMode implements BridgeMode { boolean online = true; final Runnable runnable = new Runnable() { @Override @@ -190,4 +192,63 @@ public class NativeToJsMessageQueue { cordova.getActivity().runOnUiThread(runnable); } } + + /** + * Uses Java reflection to access an API that lets us eval JS. + * Requires Android 3.2.4 or above. + */ + private class PrivateApiBridgeMode implements BridgeMode { + // Message added in commit: + // http://omapzoom.org/?p=platform/frameworks/base.git;a=commitdiff;h=9497c5f8c4bc7c47789e5ccde01179abc31ffeb2 + // Which first appeared in 3.2.4ish. + private static final int EXECUTE_JS = 194; + + Method sendMessageMethod; + Object webViewCore; + boolean initFailed; + + @SuppressWarnings("rawtypes") + private void initReflection() { + Object webViewObject = webView; + Class webViewClass = WebView.class; + try { + Field f = webViewClass.getDeclaredField("mProvider"); + f.setAccessible(true); + webViewObject = f.get(webView); + webViewClass = webViewObject.getClass(); + } catch (Throwable e) { + // mProvider is only required on newer Android releases. + } + + try { + Field f = webViewClass.getDeclaredField("mWebViewCore"); + f.setAccessible(true); + webViewCore = f.get(webViewObject); + + if (webViewCore != null) { + sendMessageMethod = webViewCore.getClass().getDeclaredMethod("sendMessage", Message.class); + sendMessageMethod.setAccessible(true); + } + } catch (Throwable e) { + initFailed = true; + Log.e(LOG_TAG, "PrivateApiBridgeMode failed to find the expected APIs.", e); + } + } + + public void onNativeToJsMessageAvailable() { + if (sendMessageMethod == null && !initFailed) { + initReflection(); + } + // webViewCore is lazily initialized, and so may not be available right away. + if (sendMessageMethod != null) { + String js = popAll(); + Message execJsMessage = Message.obtain(null, EXECUTE_JS, js); + try { + sendMessageMethod.invoke(webViewCore, execJsMessage); + } catch (Throwable e) { + Log.e(LOG_TAG, "Reflection message bridge failed.", e); + } + } + } + } }
