Change Android activity title from JNI call

platform_tools/android/apps/viewer/src/main/java/org/skia/viewer/ViewerApplication.java

Index: platform_tools/android/apps/viewer/src/main/java/org/skia/viewer/ViewerApplication.java
diff --git a/platform_tools/android/apps/viewer/src/main/java/org/skia/viewer/ViewerApplication.java b/platform_tools/android/apps/viewer/src/main/java/org/skia/viewer/ViewerApplication.java
index 9389f7220810b458d0075d155087e0d1c37578dd..9e7fee70c55dd461d4ee46d0ad8d3ef085728cb5 100644
--- a/platform_tools/android/apps/viewer/src/main/java/org/skia/viewer/ViewerApplication.java
+++ b/platform_tools/android/apps/viewer/src/main/java/org/skia/viewer/ViewerApplication.java
@@ -8,9 +8,12 @@
 package org.skia.viewer;
 
 import android.app.Application;
+import android.util.Log;

[djsollen, 2016/05/13 14:56:27]

unused import

[liyuqian, 2016/05/13 15:18:41]

Done.

 
 public class ViewerApplication extends Application {
     private long mNativeHandle = 0;
+    private ViewerActivity mViewerActivity;
+    private String mTitle;
 
     static {
         System.loadLibrary("skia_android");
@@ -38,4 +41,24 @@ public class ViewerApplication extends Application {
     public long getNativeHandle() {
         return mNativeHandle;
     }
+
+    public ViewerActivity getViewerActivity() {

[djsollen, 2016/05/13 14:56:26]

remove unused getter

[liyuqian, 2016/05/13 15:18:41]

Done.

+        return mViewerActivity;
+    }
+
+    public void setViewerActivity(ViewerActivity viewerActivity) {
+        this.mViewerActivity = viewerActivity;
+    }
+
+    public void setTitle(String title) {
+        mTitle = title;
+        if (mViewerActivity != null) {
+            mViewerActivity.runOnUiThread(new Runnable() {
+                @Override
+                public void run() {
+                    mViewerActivity.setTitle(mTitle);

[djsollen, 2016/05/13 14:56:27]

I would have thought this would be something like...

ActionBar ab = mViewerActivity.getActionBar();
 ab.setTitle("My Title");

also is this not thread safe?  Do you need to post a message to the UI thread to
make that change?

[liyuqian, 2016/05/13 15:18:41]

I think mViewerActivity.setTitle is equivalent to
mViewerActivity.getActionBar().setTitle, except that the former is a little
shorter?

The setTitle needs to be run on UI thread because setting ActionBar title from
my native pthread is forbidden (and it will cause exception to crash the Android
app).

+                }
+            });
+        }
+    }
 }