Don't try to initialize EmulatorView before a TermSession is attached

This avoids a crash when the view is inflated from XML and a TermSession
isn't attached right away.

Because onSizeChanged() no longer tries to initialize the view if no
TermSession is attached, we now need to call initialize() in
attachSession() if the view hasn't been initialized at that point.

libraries/emulatorview/src/jackpal/androidterm/emulatorview/EmulatorView.java

@@ -73,6 +73,9 @@ public class EmulatorView extends View implements GestureDetector.OnGestureListe
      */
     private boolean mKnownSize;
 
+    // Set if initialization was deferred because a TermSession wasn't attached
+    private boolean mDeferInit = false;
+
     private int mVisibleWidth;
     private int mVisibleHeight;
 
@@ -286,6 +289,13 @@ public void attachSession(TermSession session) {
         mTermSession = session;
 
         mKeyListener = new TermKeyListener(session);
+
+        // Do init now if it was deferred until a TermSession was attached
+        if (mDeferInit) {
+            mDeferInit = false;
+            mKnownSize = true;
+            initialize();
+        }
     }
 
     /**
@@ -1053,6 +1063,12 @@ private void updateText() {
      */
     @Override
     protected void onSizeChanged(int w, int h, int oldw, int oldh) {
+        if (mTermSession == null) {
+            // Not ready, defer until TermSession is attached
+            mDeferInit = true;
+            return;
+        }
+
         if (!mKnownSize) {
             mKnownSize = true;
             initialize();