package com.android.webview.chromium; import android.app.Application; import android.content.Context; import android.content.pm.PackageInfo; import android.content.res.AssetManager; import android.content.res.Resources; import android.graphics.Canvas; import android.os.Trace; import android.util.Log; import android.util.SparseArray; import android.view.View; import android.webkit.WebViewFactory; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; /** * Factory class for {@link WebViewDelegate com.android.webview.chromium.WebViewDelegate}s. * *
{@link WebViewDelegate com.android.webview.chromium.WebViewDelegate}s provide the same * interface as {@link android.webkit.WebViewDelegate android.webkit.WebViewDelegate} but without * a dependency on the webkit class. Defining our own * {@link WebViewDelegate com.android.webview.chromium.WebViewDelegate} in frameworks/webview * allows the WebView apk to be binary compatible with the API 21 version of the framework, in * which {@link android.webkit.WebViewDelegate android.webkit.WebViewDelegate} had not yet been * introduced. * *
The {@link WebViewDelegate com.android.webview.chromium.WebViewDelegate} interface and this * factory class can be removed once we don't longer need to support WebView apk updates to devices * running the API 21 version of the framework. At that point, we should use * {@link android.webkit.WebViewDelegate android.webkit.WebViewDelegate} directly instead. */ class WebViewDelegateFactory { /** * Copy of {@link android.webkit.WebViewDelegate android.webkit.WebViewDelegate}'s interface. * See {@link WebViewDelegateFactory} for the reasons why this copy is needed. */ interface WebViewDelegate { /** @see android.webkit.WebViewDelegate.OnTraceEnabledChangeListener */ interface OnTraceEnabledChangeListener { void onTraceEnabledChange(boolean enabled); } /** @see android.webkit.WebViewDelegate#setOnTraceEnabledChangeListener */ void setOnTraceEnabledChangeListener(final OnTraceEnabledChangeListener listener); /** @see android.webkit.WebViewDelegate#isTraceTagEnabled */ boolean isTraceTagEnabled(); /** @see android.webkit.WebViewDelegate#canInvokeDrawGlFunctor */ boolean canInvokeDrawGlFunctor(View containerView); /** @see android.webkit.WebViewDelegate#invokeDrawGlFunctor */ void invokeDrawGlFunctor(View containerView, long nativeDrawGLFunctor, boolean waitForCompletion); /** @see android.webkit.WebViewDelegate#callDrawGlFunction */ void callDrawGlFunction(Canvas canvas, long nativeDrawGLFunctor); /** @see android.webkit.WebViewDelegate#detachDrawGlFunctor */ void detachDrawGlFunctor(View containerView, long nativeDrawGLFunctor); /** @see android.webkit.WebViewDelegate#getPackageId */ int getPackageId(Resources resources, String packageName); /** @see android.webkit.WebViewDelegate#getApplication */ Application getApplication(); /** @see android.webkit.WebViewDelegate#getErrorString */ String getErrorString(Context context, int errorCode); /** @see android.webkit.WebViewDelegate#addWebViewAssetPath */ void addWebViewAssetPath(Context context); } /** * Creates a {@link WebViewDelegate com.android.webview.chromium.WebViewDelegate} that proxies * requests to the given {@link android.webkit.WebViewDelegate android.webkit.WebViewDelegate}. * * @return the created delegate */ static WebViewDelegate createProxyDelegate(android.webkit.WebViewDelegate delegate) { return new ProxyDelegate(delegate); } /** * Creates a {@link WebViewDelegate com.android.webview.chromium.WebViewDelegate} compatible * with the API 21 version of the framework in which * {@link android.webkit.WebViewDelegate android.webkit.WebViewDelegate} had not yet been * introduced. * * @return the created delegate */ static WebViewDelegate createApi21CompatibilityDelegate() { return new Api21CompatibilityDelegate(); } /** * A {@link WebViewDelegate com.android.webview.chromium.WebViewDelegate} that proxies requests * to a {@link android.webkit.WebViewDelegate android.webkit.WebViewDelegate}. */ private static class ProxyDelegate implements WebViewDelegate { android.webkit.WebViewDelegate delegate; ProxyDelegate(android.webkit.WebViewDelegate delegate) { this.delegate = delegate; } @Override public void setOnTraceEnabledChangeListener(final OnTraceEnabledChangeListener listener) { delegate.setOnTraceEnabledChangeListener( new android.webkit.WebViewDelegate.OnTraceEnabledChangeListener() { @Override public void onTraceEnabledChange(boolean enabled) { listener.onTraceEnabledChange(enabled); ; } }); } @Override public boolean isTraceTagEnabled() { return delegate.isTraceTagEnabled(); } @Override public boolean canInvokeDrawGlFunctor(View containerView) { return delegate.canInvokeDrawGlFunctor(containerView); } @Override public void invokeDrawGlFunctor(View containerView, long nativeDrawGLFunctor, boolean waitForCompletion) { delegate.invokeDrawGlFunctor(containerView, nativeDrawGLFunctor, waitForCompletion); } @Override public void callDrawGlFunction(Canvas canvas, long nativeDrawGLFunctor) { delegate.callDrawGlFunction(canvas, nativeDrawGLFunctor); } @Override public void detachDrawGlFunctor(View containerView, long nativeDrawGLFunctor) { delegate.detachDrawGlFunctor(containerView, nativeDrawGLFunctor); } @Override public int getPackageId(Resources resources, String packageName) { return delegate.getPackageId(resources, packageName); } @Override public Application getApplication() { return delegate.getApplication(); } @Override public String getErrorString(Context context, int errorCode) { return delegate.getErrorString(context, errorCode); } @Override public void addWebViewAssetPath(Context context) { delegate.addWebViewAssetPath(context); } } /** * A {@link WebViewDelegate com.android.webview.chromium.WebViewDelegate} compatible with the * API 21 version of the framework in which * {@link android.webkit.WebViewDelegate android.webkit.WebViewDelegate} had not yet been * introduced. * *
This class implements the * {@link WebViewDelegate com.android.webview.chromium.WebViewDelegate} functionality by using * reflection to call into hidden frameworks APIs released in the API-21 version of the * framework. */ private static class Api21CompatibilityDelegate implements WebViewDelegate { /** Copy of Trace.TRACE_TAG_WEBVIEW */ private final static long TRACE_TAG_WEBVIEW = 1L << 4; /** Hidden APIs released in the API 21 version of the framework */ private final Method mIsTagEnabledMethod; private final Method mAddChangeCallbackMethod; private final Method mGetViewRootImplMethod; private final Method mInvokeFunctorMethod; private final Method mCallDrawGLFunctionMethod; private final Method mDetachFunctorMethod; private final Method mGetAssignedPackageIdentifiersMethod; private final Method mAddAssetPathMethod; private final Method mCurrentApplicationMethod; private final Method mGetStringMethod; private final Method mGetLoadedPackageInfoMethod; Api21CompatibilityDelegate() { try { // Important: This reflection essentially defines a snapshot of some hidden APIs // at version 21 of the framework for compatibility reasons, and the reflection // should not be changed even if those hidden APIs change in future releases. mIsTagEnabledMethod = Trace.class.getMethod("isTagEnabled", long.class); mAddChangeCallbackMethod = Class.forName("android.os.SystemProperties") .getMethod("addChangeCallback", Runnable.class); mGetViewRootImplMethod = View.class.getMethod("getViewRootImpl"); mInvokeFunctorMethod = Class.forName("android.view.ViewRootImpl") .getMethod("invokeFunctor", long.class, boolean.class); mDetachFunctorMethod = Class.forName("android.view.ViewRootImpl") .getMethod("detachFunctor", long.class); mCallDrawGLFunctionMethod = Class.forName("android.view.HardwareCanvas") .getMethod("callDrawGLFunction", long.class); mGetAssignedPackageIdentifiersMethod = AssetManager.class.getMethod( "getAssignedPackageIdentifiers"); mAddAssetPathMethod = AssetManager.class.getMethod( "addAssetPath", String.class); mCurrentApplicationMethod = Class.forName("android.app.ActivityThread") .getMethod("currentApplication"); mGetStringMethod = Class.forName("android.net.http.ErrorStrings") .getMethod("getString", int.class, Context.class); mGetLoadedPackageInfoMethod = Class.forName("android.webkit.WebViewFactory") .getMethod("getLoadedPackageInfo"); } catch (Exception e) { throw new RuntimeException("Invalid reflection", e); } } @Override public void setOnTraceEnabledChangeListener(final OnTraceEnabledChangeListener listener) { try { mAddChangeCallbackMethod.invoke(null, new Runnable() { @Override public void run() { listener.onTraceEnabledChange(isTraceTagEnabled()); } }); } catch (Exception e) { throw new RuntimeException("Invalid reflection", e); } } @Override public boolean isTraceTagEnabled() { try { return ((Boolean) mIsTagEnabledMethod.invoke(null, TRACE_TAG_WEBVIEW)); } catch (Exception e) { throw new RuntimeException("Invalid reflection", e); } } @Override public boolean canInvokeDrawGlFunctor(View containerView) { try { Object viewRootImpl = mGetViewRootImplMethod.invoke(containerView); // viewRootImpl can be null during teardown when window is leaked. return viewRootImpl != null; } catch (Exception e) { throw new RuntimeException("Invalid reflection", e); } } @Override public void invokeDrawGlFunctor(View containerView, long nativeDrawGLFunctor, boolean waitForCompletion) { try { Object viewRootImpl = mGetViewRootImplMethod.invoke(containerView); if (viewRootImpl != null) { mInvokeFunctorMethod.invoke(viewRootImpl, nativeDrawGLFunctor, waitForCompletion); } } catch (Exception e) { throw new RuntimeException("Invalid reflection", e); } } @Override public void callDrawGlFunction(Canvas canvas, long nativeDrawGLFunctor) { try { mCallDrawGLFunctionMethod.invoke(canvas, nativeDrawGLFunctor); } catch (Exception e) { throw new RuntimeException("Invalid reflection", e); } } @Override public void detachDrawGlFunctor(View containerView, long nativeDrawGLFunctor) { try { Object viewRootImpl = mGetViewRootImplMethod.invoke(containerView); if (viewRootImpl != null) { mDetachFunctorMethod.invoke(viewRootImpl, nativeDrawGLFunctor); } } catch (Exception e) { throw new RuntimeException("Invalid reflection", e); } } @Override public int getPackageId(Resources resources, String packageName) { try { SparseArray packageIdentifiers = (SparseArray) mGetAssignedPackageIdentifiersMethod.invoke( resources.getAssets()); for (int i = 0; i < packageIdentifiers.size(); i++) { final String name = (String) packageIdentifiers.valueAt(i); if (packageName.equals(name)) { return packageIdentifiers.keyAt(i); } } } catch (Exception e) { throw new RuntimeException("Invalid reflection", e); } throw new RuntimeException("Package not found: " + packageName); } @Override public Application getApplication() { try { return (Application) mCurrentApplicationMethod.invoke(null); } catch (Exception e) { throw new RuntimeException("Invalid reflection", e); } } @Override public String getErrorString(Context context, int errorCode) { try { return (String) mGetStringMethod.invoke(null, errorCode, context); } catch (Exception e) { throw new RuntimeException("Invalid reflection", e); } } @Override public void addWebViewAssetPath(Context context) { try { PackageInfo info = (PackageInfo) mGetLoadedPackageInfoMethod.invoke(null); mAddAssetPathMethod.invoke(context.getAssets(), info.applicationInfo.sourceDir); } catch (Exception e) { throw new RuntimeException("Invalid reflection", e); } } } }