Add quick and dirty async AssistStructure building.

New APIs on ViewAssistStructure all the app to request to
build a sub-tree asynchronously and indicate when it is done
with that.  The overall AssistStructure is now only flattened
and transfered on-demand, when the app receiving it requests
its data -- and at that point we can wait for any asynchronous
building to complete.

New AsyncStructure view is a very simple example of using this
to asynchronously build a child view.

Change-Id: I14f9199bee64915ad3dc80b2190916ec874308af

4 files changed, 68 insertions, 1 deletions

diff --git a/tests/VoiceInteraction/res/layout/main.xml b/tests/VoiceInteraction/res/layout/main.xml
index 3d7a418..092d37d 100644
--- a/tests/VoiceInteraction/res/layout/main.xml
+++ b/tests/VoiceInteraction/res/layout/main.xml
@@ -26,6 +26,14 @@
         android:text="@string/start"
         />
 
+    <com.android.test.voiceinteraction.AsyncStructure
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:paddingTop="64dp"
+            android:paddingBottom="64dp"
+            android:text="@string/asyncStructure"
+            />
+
 </LinearLayout>
 
 
diff --git a/tests/VoiceInteraction/res/values/strings.xml b/tests/VoiceInteraction/res/values/strings.xml
index 5331457..942c931 100644
--- a/tests/VoiceInteraction/res/values/strings.xml
+++ b/tests/VoiceInteraction/res/values/strings.xml
@@ -17,6 +17,7 @@
 <resources>
 
     <string name="start">Start</string>
+    <string name="asyncStructure">(Async structure goes here)</string>
     <string name="confirm">Confirm</string>
     <string name="abort">Abort</string>
     <string name="complete">Complete</string>
diff --git a/tests/VoiceInteraction/src/com/android/test/voiceinteraction/AssistVisualizer.java b/tests/VoiceInteraction/src/com/android/test/voiceinteraction/AssistVisualizer.java
index 782d112..8a72341 100644
--- a/tests/VoiceInteraction/src/com/android/test/voiceinteraction/AssistVisualizer.java
+++ b/tests/VoiceInteraction/src/com/android/test/voiceinteraction/AssistVisualizer.java
@@ -45,8 +45,8 @@ public class AssistVisualizer extends View {
     }
 
     public void setAssistStructure(AssistStructure as) {
-        mAssistStructure.dump();
         mAssistStructure = as;
+        mAssistStructure.dump();
         mTextRects.clear();
         final int N = as.getWindowNodeCount();
         if (N > 0) {
diff --git a/tests/VoiceInteraction/src/com/android/test/voiceinteraction/AsyncStructure.java b/tests/VoiceInteraction/src/com/android/test/voiceinteraction/AsyncStructure.java
new file mode 100644
index 0000000..73e04e5
--- /dev/null
+++ b/tests/VoiceInteraction/src/com/android/test/voiceinteraction/AsyncStructure.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2015 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.android.test.voiceinteraction;
+
+import android.annotation.Nullable;
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.ViewAssistStructure;
+import android.widget.TextView;
+
+/**
+ * Test for asynchronously creating additional assist structure.
+ */
+public class AsyncStructure extends TextView {
+    public AsyncStructure(Context context, @Nullable AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    public void onProvideVirtualAssistStructure(ViewAssistStructure structure) {
+        structure.setChildCount(1);
+        final ViewAssistStructure child = structure.asyncNewChild(0);
+        final int width = getWidth();
+        final int height = getHeight();
+        (new Thread() {
+            @Override
+            public void run() {
+                // Simulate taking a long time to build this.
+                try {
+                    sleep(2000);
+                } catch (InterruptedException e) {
+                }
+                child.setClassName(AsyncStructure.class.getName());
+                child.setVisibility(View.VISIBLE);
+                child.setDimens(width / 4, height / 4, 0, 0, width / 2, height / 2);
+                child.setEnabled(true);
+                child.setContentDescription("This is some async content");
+                child.setText("We could have lots and lots of async text!");
+                child.asyncCommit();
+            }
+        }).start();
+    }
+}