android: Fix the application lifecycle.

Now onStart() loads the file, and onStop() closes it again.  Fixes the case
when the user leaves the app by pressing Home, and starts it again;
previously, this caused a race.

Change-Id: I493a76eaf5e8ca8a68b53f70c7acd09b638f7e11

android/experimental/LOAndroid3/src/java/org/libreoffice/LOEvent.java

@@ -13,7 +13,8 @@ public class LOEvent {
     public static final int DRAW = 4;
     public static final int CHANGE_PART = 5;
     public static final int LOAD = 6;
-    public static final int REDRAW = 7;
+    public static final int CLOSE = 7;
+    public static final int REDRAW = 8;
 
     public int mType;
     private ImmutableViewportMetrics mViewportMetrics;
@@ -58,6 +59,9 @@ public class LOEvent {
     }
 
     public String getTypeString() {
+        if (mTypeString == null) {
+            return "Event type: " + mType;
+        }
         return mTypeString;
     }
 

android/experimental/LOAndroid3/src/java/org/libreoffice/LOEventFactory.java

@@ -31,6 +31,10 @@ public class LOEventFactory {
         return new LOEvent(LOEvent.LOAD, inputFile);
     }
 
+    public static LOEvent close() {
+        return new LOEvent(LOEvent.CLOSE);
+    }
+
     public static LOEvent redraw() {
         return new LOEvent(LOEvent.REDRAW);
     }

android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitThread.java

@@ -61,7 +61,7 @@ public class LOKitThread extends Thread {
         LOKitShell.hideProgressSpinner();
     }
 
-    private boolean load(String filename) {
+    private boolean loadDocument(String filename) {
         if (mApplication == null) {
             mApplication = LibreOfficeMainActivity.mAppContext;
         }
@@ -69,10 +69,6 @@ public class LOKitThread extends Thread {
         mController = mApplication.getLayerController();
         mLayerClient = mApplication.getLayerClient();
 
-        if (mTileProvider != null) {
-            mTileProvider.close();
-        }
-
         mTileProvider = TileProviderFactory.create(mController, filename);
         boolean isReady = mTileProvider.isReady();
         if (isReady) {
@@ -82,9 +78,16 @@ public class LOKitThread extends Thread {
             refresh();
             LOKitShell.hideProgressSpinner();
         }
+
         return isReady;
     }
 
+    public void closeDocument() {
+        if (mTileProvider != null) {
+            mTileProvider.close();
+        }
+    }
+
     public void run() {
         try {
             while (true) {
@@ -95,9 +98,13 @@ public class LOKitThread extends Thread {
     }
 
     private void processEvent(LOEvent event) {
+        Log.i(LOGTAG, "processEvent: " + event.getTypeString());
         switch (event.mType) {
             case LOEvent.LOAD:
-                load(event.getFilename());
+                loadDocument(event.getFilename());
+                break;
+            case LOEvent.CLOSE:
+                closeDocument();
                 break;
             case LOEvent.VIEWPORT:
                 mViewportMetrics = event.getViewport();

android/experimental/LOAndroid3/src/java/org/libreoffice/LibreOfficeMainActivity.java

@@ -136,8 +136,6 @@ public class LibreOfficeMainActivity extends Activity {
         LayerView layerView = (LayerView) findViewById(R.id.layer_view);
         mLayerController.setView(layerView);
         mLayerController.setLayerClient(mLayerClient);
-
-        LOKitShell.sendEvent(LOEventFactory.load(mInputFile));
     }
 
     @Override
@@ -156,11 +154,13 @@ public class LibreOfficeMainActivity extends Activity {
     protected void onStart() {
         Log.i(LOGTAG, "onStart..");
         super.onStart();
+        LOKitShell.sendEvent(LOEventFactory.load(mInputFile));
     }
 
     @Override
     protected void onStop() {
         Log.i(LOGTAG, "onStop..");
+        LOKitShell.sendEvent(LOEventFactory.close());
         super.onStop();
     }
 
@@ -199,21 +199,19 @@ public class LibreOfficeMainActivity extends Activity {
 
         builder.setNegativeButton(R.string.about_license, new DialogInterface.OnClickListener() {
             @Override
-            public void onClick(View view) {
-                Intent intent = new Intent(view.getContext(), LibreOfficeMainActivity.class);
-                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
-                intent.setData(Uri.parse("file:///assets/license.txt"));
-                startActivity(intent);
+            public void onClick(DialogInterface dialog, int id) {
+                LOKitShell.sendEvent(LOEventFactory.close());
+                LOKitShell.sendEvent(LOEventFactory.load("/assets/license.txt"));
+                dialog.dismiss();
             }
         });
 
         builder.setPositiveButton(R.string.about_notice, new DialogInterface.OnClickListener() {
             @Override
-            public void onClick(View view) {
-                Intent intent = new Intent(view.getContext(), LibreOfficeMainActivity.class);
-                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
-                intent.setData(Uri.parse("file:///assets/notice.txt"));
-                startActivity(intent);
+            public void onClick(DialogInterface dialog, int id) {
+                LOKitShell.sendEvent(LOEventFactory.close());
+                LOKitShell.sendEvent(LOEventFactory.load("/assets/notice.txt"));
+                dialog.dismiss();
             }
         });