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Added Native-JS bridge mode that uses private WebView APIs.

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This commit is contained in:
Andrew Grieve 2012-08-21 20:45:59 -04:00
parent e239fd970f
commit bbafe53a2b
1 changed files with 70 additions and 9 deletions
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79
framework/src/org/apache/cordova/NativeToJsMessageQueue.java
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@ -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);
}
}
}
}
}