diff --git a/samples/ApiDemos/AndroidManifest.xml b/samples/ApiDemos/AndroidManifest.xml
index 153db9519..f23a215b7 100644
--- a/samples/ApiDemos/AndroidManifest.xml
+++ b/samples/ApiDemos/AndroidManifest.xml
@@ -1757,6 +1757,13 @@
+
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+
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diff --git a/samples/ApiDemos/res/layout/secure_view.xml b/samples/ApiDemos/res/layout/secure_view.xml
new file mode 100644
index 000000000..82a1f7938
--- /dev/null
+++ b/samples/ApiDemos/res/layout/secure_view.xml
@@ -0,0 +1,112 @@
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diff --git a/samples/ApiDemos/res/layout/secure_view_overlay.xml b/samples/ApiDemos/res/layout/secure_view_overlay.xml
new file mode 100644
index 000000000..aaa043af1
--- /dev/null
+++ b/samples/ApiDemos/res/layout/secure_view_overlay.xml
@@ -0,0 +1,50 @@
+
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diff --git a/samples/ApiDemos/res/values/arrays.xml b/samples/ApiDemos/res/values/arrays.xml
index e462868c5..8b32e86de 100644
--- a/samples/ApiDemos/res/values/arrays.xml
+++ b/samples/ApiDemos/res/values/arrays.xml
@@ -103,4 +103,12 @@
Complex
+
+
+ *bzzt*\nTransferred $1,000,000 to J. Phisher. Thank you!
+ *bzzt*\nSending all life savings to the International Cabal of Evil Penguins.
+ *bzzt*\nOpening portal to R\'lyeh. Long live Cthulhu!
+ *bzzt*\nYou\'re not very good at this, are you?
+ *bzzt*\nGo away...
+
diff --git a/samples/ApiDemos/res/values/strings.xml b/samples/ApiDemos/res/values/strings.xml
index a29df0fc1..2f95bb905 100644
--- a/samples/ApiDemos/res/values/strings.xml
+++ b/samples/ApiDemos/res/values/strings.xml
@@ -610,6 +610,49 @@
ShareMake a Popup!
+
+ This activity demonstrates a view that detects when it is potentially obscured
+ by other windows.
+
+ Click me first:
+
+ Pop up a toast that will overlay and obscure this window in a poor attempt to fool
+ you into clicking the big red buttons. Don\'t do it!
+
+ Unfiltered demo:
+
+ This button does no filtering. This button will still work as usual while the
+ toast is visible and is spoofing the view. Careful!
+
+ Built-in filtering demo:
+
+ This button uses the built-in secure touch filtering provided by the framework
+ using the android:filterTouchesWhenObscured attribute. This button will be inoperable
+ while the toast is visible.
+
+ Custom filtering demo:
+
+ This button filters touches using a touch listener to examine the MotionEvent flags
+ and warns the user. This button will display a message if touched while the
+ toast is visible.
+
+
+ Pop toast
+ Don\'t click! It\'ll cost you!
+ Oh no!
+ Oops...
+ Saved!
+
+ Careful! There appears to be another window partly obscuring this window...
+ Something unutterably HORRIBLE might have happened.
+
+ Phew!
+
+ A toast! A toast!
+ Totally safe, trust me...
+ Clicky?
+ Think of the penguins!
+
diff --git a/samples/ApiDemos/src/com/example/android/apis/view/SecureView.java b/samples/ApiDemos/src/com/example/android/apis/view/SecureView.java
new file mode 100644
index 000000000..b9aaeabcd
--- /dev/null
+++ b/samples/ApiDemos/src/com/example/android/apis/view/SecureView.java
@@ -0,0 +1,144 @@
+/*
+ * Copyright (C) 2010 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 com.example.android.apis.view;
+
+import com.example.android.apis.R;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.os.Bundle;
+import android.view.Gravity;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.View.OnTouchListener;
+import android.widget.Button;
+import android.widget.Toast;
+
+
+/**
+ * This activity demonstrates two different ways in which views can be made more secure to
+ * touch spoofing attacks by leveraging framework features.
+ *
+ * The activity presents 3 buttons that obtensibly perform a risky security critical
+ * function. Under ordinary circumstances, the user would never click on these buttons
+ * or would at least think long and hard about it. However, a carefully crafted toast can
+ * overlay the contents of the activity in such a way as to make the user believe the buttons
+ * are innocuous. Since the toast cannot receive input, the touches are passed down to the
+ * activity potentially yielding an effect other than what the user intended.
+ *
+ * To simulate the spoofing risk, this activity pops up a specially crafted overlay as
+ * a toast layed out so as to cover the buttons and part of the descriptive text.
+ * For the purposes of this demonstration, pretend that the overlay was actually popped
+ * up by a malicious application published by the International Cabal of Evil Penguins.
+ *
+ * The 3 buttons are set up as follows:
+ *
+ * 1. The "unsecured button" does not apply any touch filtering of any kind.
+ * When the toast appears, this button remains clickable as usual which creates an
+ * opportunity for spoofing to occur.
+ *
+ * 2. The "built-in secured button" leverages the android:filterTouchesWhenObscured view
+ * attribute to ask the framework to filter out touches when the window is obscured.
+ * When the toast appears, the button does not receive the touch and appears to be inoperable.
+ *
+ * 3. The "custom secured button" adds a touch listener to the button which intercepts the
+ * touch event and checks whether the window is obscured. If so, it warns the user and
+ * drops the touch event. This example is intended to demonstrate how a view can
+ * perform its own filtering and provide additional feedback by examining the {@MotionEvent}
+ * flags to determine whether the window is obscured. Here we use a touch listener but
+ * a custom view subclass could perform the filtering by overriding
+ * {@link View#onFilterTouchEventForSecurity(MotionEvent)}.
+ *
+ * Refer to the comments on {@View} for more information about view security.
+ */
+public class SecureView extends Activity {
+ private int mClickCount;
+
+ @Override
+ protected void onCreate(Bundle savedInstanceState) {
+ super.onCreate(savedInstanceState);
+
+ setContentView(R.layout.secure_view);
+
+ Button toastButton = (Button) findViewById(R.id.secure_view_toast_button);
+ toastButton.setOnClickListener(new OnClickListener() {
+ public void onClick(View v) {
+ showOverlay();
+ }
+ });
+
+ Button unsecureButton = (Button) findViewById(R.id.secure_view_unsecure_button);
+ setClickedAction(unsecureButton);
+
+ Button builtinSecureButton = (Button) findViewById(R.id.secure_view_builtin_secure_button);
+ setClickedAction(builtinSecureButton);
+
+ Button customSecureButton = (Button) findViewById(R.id.secure_view_custom_secure_button);
+ setClickedAction(customSecureButton);
+ setTouchFilter(customSecureButton);
+ }
+
+ private void showOverlay() {
+ // Generate a toast view with a special layout that will position itself right
+ // on top of this view's interesting widgets. Sneaky huh?
+ SecureViewOverlay overlay = (SecureViewOverlay)
+ getLayoutInflater().inflate(R.layout.secure_view_overlay, null);
+ overlay.setActivityToSpoof(this);
+
+ Toast toast = new Toast(getApplicationContext());
+ toast.setGravity(Gravity.FILL, 0, 0);
+ toast.setView(overlay);
+ toast.show();
+ }
+
+ private void setClickedAction(Button button) {
+ button.setOnClickListener(new OnClickListener() {
+ public void onClick(View v) {
+ String[] messages = getResources().getStringArray(R.array.secure_view_clicked);
+ String message = messages[mClickCount++ % messages.length];
+
+ new AlertDialog.Builder(SecureView.this)
+ .setTitle(R.string.secure_view_action_dialog_title)
+ .setMessage(message)
+ .setNeutralButton(getResources().getString(
+ R.string.secure_view_action_dialog_dismiss), null)
+ .show();
+ }
+ });
+ }
+
+ private void setTouchFilter(Button button) {
+ button.setOnTouchListener(new OnTouchListener() {
+ public boolean onTouch(View v, MotionEvent event) {
+ if ((event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) {
+ if (event.getAction() == MotionEvent.ACTION_UP) {
+ new AlertDialog.Builder(SecureView.this)
+ .setTitle(R.string.secure_view_caught_dialog_title)
+ .setMessage(R.string.secure_view_caught_dialog_message)
+ .setNeutralButton(getResources().getString(
+ R.string.secure_view_caught_dialog_dismiss), null)
+ .show();
+ }
+ // Return true to prevent the button from processing the touch.
+ return true;
+ }
+ return false;
+ }
+ });
+ }
+}
diff --git a/samples/ApiDemos/src/com/example/android/apis/view/SecureViewOverlay.java b/samples/ApiDemos/src/com/example/android/apis/view/SecureViewOverlay.java
new file mode 100644
index 000000000..2095fee3f
--- /dev/null
+++ b/samples/ApiDemos/src/com/example/android/apis/view/SecureViewOverlay.java
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2010 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 com.example.android.apis.view;
+
+import com.example.android.apis.R;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.ViewGroup;
+
+/**
+ * This view is part of the {@link SecureView} demonstration activity.
+ *
+ * This view is constructed in such a way as to obscure the buttons and descriptive
+ * text of the activity in a poor attempt to fool the user into clicking on the buttons
+ * despite the activity telling the user that they may be harmful.
+ */
+public class SecureViewOverlay extends ViewGroup {
+ private SecureView mActivity;
+
+ public SecureViewOverlay(Context context, AttributeSet attrs) {
+ super(context, attrs);
+ }
+
+ public void setActivityToSpoof(SecureView activity) {
+ this.mActivity = activity;
+ }
+
+ @Override
+ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+ measureChildren(widthMeasureSpec, heightMeasureSpec);
+
+ super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+ }
+
+ @Override
+ protected void onLayout(boolean changed, int l, int t, int r, int b) {
+ spoofLayout(findViewById(R.id.secure_view_overlay_description),
+ mActivity.findViewById(R.id.secure_view_description));
+ spoofLayout(findViewById(R.id.secure_view_overlay_button1),
+ mActivity.findViewById(R.id.secure_view_unsecure_button));
+ spoofLayout(findViewById(R.id.secure_view_overlay_button2),
+ mActivity.findViewById(R.id.secure_view_builtin_secure_button));
+ spoofLayout(findViewById(R.id.secure_view_overlay_button3),
+ mActivity.findViewById(R.id.secure_view_custom_secure_button));
+ }
+
+ private void spoofLayout(View spoof, View original) {
+ final int[] globalPos = new int[2];
+ getLocationOnScreen(globalPos);
+ int x = globalPos[0];
+ int y = globalPos[1];
+
+ original.getLocationOnScreen(globalPos);
+ x = globalPos[0] - x;
+ y = globalPos[1] - y;
+ spoof.layout(x, y, x + original.getWidth(), y + original.getHeight());
+ }
+}