adding support for webkit plugins to use the java view system

Change-Id: I4fb328e5f30476fe4aa70565bacb969dc97b495d

3 files changed, 179 insertions, 0 deletions

diff --git a/core/java/android/webkit/PluginActivity.java b/core/java/android/webkit/PluginActivity.java
new file mode 100644
index 0000000..f9e3080
--- /dev/null
+++ b/core/java/android/webkit/PluginActivity.java
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package android.webkit;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+
+/**
+ * This activity  is invoked when a plugin elects to go into full screen mode.
+ * @hide
+ */
+public class PluginActivity extends Activity {
+
+    /* package */ static final String INTENT_EXTRA_PACKAGE_NAME =
+            "android.webkit.plugin.PACKAGE_NAME";
+    /* package */ static final String INTENT_EXTRA_CLASS_NAME =
+            "android.webkit.plugin.CLASS_NAME";
+    /* package */ static final String INTENT_EXTRA_NPP_INSTANCE =
+            "android.webkit.plugin.NPP_INSTANCE";
+
+    /** Called when the activity is first created. */
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        final Intent intent = getIntent();
+        if (intent == null) {
+            // No intent means no class to lookup.
+            finish();
+        }
+        final String packageName =
+                intent.getStringExtra(INTENT_EXTRA_PACKAGE_NAME);
+        final String className = intent.getStringExtra(INTENT_EXTRA_CLASS_NAME);
+        final int npp = intent.getIntExtra(INTENT_EXTRA_NPP_INSTANCE, -1);
+        // Retrieve the PluginStub implemented in packageName.className
+        PluginStub stub =
+                PluginUtil.getPluginStub(this, packageName, className, npp);
+
+        if (stub != null) {
+            View pluginView = stub.getFullScreenView(this);
+            if (pluginView != null) {
+                setContentView(pluginView);
+            } else {
+                // No custom full-sreen view returned by the plugin, odd but
+                // just in case, finish the activity.
+                finish();
+            }
+        } else {
+            finish();
+        }
+    }
+}
diff --git a/core/java/android/webkit/PluginStub.java b/core/java/android/webkit/PluginStub.java
new file mode 100644
index 0000000..c24da8d
--- /dev/null
+++ b/core/java/android/webkit/PluginStub.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package android.webkit;
+
+import android.content.Context;
+import android.view.View;
+
+/**
+ * This abstract class is used to implement plugins in a WebView. A plugin
+ * package may extend this class and implement the abstract functions to create
+ * embedded or fullscreeen views displayed in a WebView. The PluginStub
+ * implementation will be provided the same NPP instance that is created
+ * through the native interface.
+ */
+public abstract class PluginStub {
+    /**
+     * Construct a new PluginStub implementation for the given NPP instance.
+     * @param npp The native NPP instance.
+     */
+    public PluginStub(int npp) { }
+
+    /**
+     * Return a custom embedded view to draw the plugin.
+     * @param context The current application's Context.
+     * @return A custom View that will be managed by WebView.
+     */
+    public abstract View getEmbeddedView(Context context);
+
+    /**
+     * Return a custom full-screen view to be displayed when the user requests
+     * a plugin display as full-screen. Note that the application may choose not
+     * to display this View as completely full-screen.
+     * @param context The current application's Context.
+     * @return A custom View that will be managed by the application.
+     */
+    public abstract View getFullScreenView(Context context);
+}
diff --git a/core/java/android/webkit/PluginUtil.java b/core/java/android/webkit/PluginUtil.java
new file mode 100644
index 0000000..c0a7375
--- /dev/null
+++ b/core/java/android/webkit/PluginUtil.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package android.webkit;
+
+import android.content.Context;
+import android.content.pm.PackageManager.NameNotFoundException;
+import android.util.Log;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+class PluginUtil {
+
+    private static final String LOGTAG = "PluginUtil";
+
+    /**
+     * 
+     * @param packageName the name of the apk where the class can be found
+     * @param className the fully qualified name of a subclass of PluginStub
+     */
+    /* package */
+    static PluginStub getPluginStub(Context context, String packageName,
+            String className, int NPP) {
+        try {
+            Context pluginContext = context.createPackageContext(packageName,
+                    Context.CONTEXT_INCLUDE_CODE |
+                    Context.CONTEXT_IGNORE_SECURITY);
+            ClassLoader pluginCL = pluginContext.getClassLoader();
+
+            Class<?> stubClass =
+                    pluginCL.loadClass(className);
+            Constructor<?> stubConstructor =
+                    stubClass.getConstructor(int.class);
+            Object stubObject = stubConstructor.newInstance(NPP);
+
+            if (stubObject instanceof PluginStub) {
+                return (PluginStub) stubObject;
+            } else {
+                Log.e(LOGTAG, "The plugin class is not of type PluginStub");
+            }
+        } catch (Exception e) {
+            // Any number of things could have happened. Log the exception and
+            // return null. Careful not to use Log.e(LOGTAG, "String", e)
+            // because that reports the exception to the checkin service.
+            Log.e(LOGTAG, Log.getStackTraceString(e));
+        }
+        return null;
+    }
+}