Fix some crash.

Author: rome753

activitytaskview/src/main/java/cc/rome753/activitytask/ActivityTask.java

@@ -111,12 +111,14 @@ public void handleMessage(Message msg) {
                         }
                     }
                 } else {
-                    if(info.lifecycle.contains("Create")) {
-                        activityTaskView.add(info);
-                    } else if(info.lifecycle.contains("Destroy")) {
-                        activityTaskView.remove(info);
-                    } else {
-                        activityTaskView.update(info);
+                    if(activityTaskView != null) {
+                        if (info.lifecycle.contains("Create")) {
+                            activityTaskView.add(info);
+                        } else if (info.lifecycle.contains("Destroy")) {
+                            activityTaskView.remove(info);
+                        } else {
+                            activityTaskView.update(info);
+                        }
                     }
                 }
             }

activitytaskview/src/main/java/cc/rome753/activitytask/model/TextViewFractory.java

@@ -35,8 +35,15 @@ public ObserverTextView getOne(Context context) {
             view = new ObserverTextView(context);
         } else {
             view = pool.remove();
+            removeParent(view);
         }
         return view;
     }
 
+    private void removeParent(View view) {
+        if(view != null && view.getParent() instanceof ViewGroup) {
+            ((ViewGroup) view.getParent()).removeView(view);
+        }
+    }
+
 }

activitytaskview/src/main/java/cc/rome753/activitytask/view/ActivityTaskView.java

@@ -111,13 +111,8 @@ private void moveToBorder() {
 
         if(p.x <= (mScreenWidth - getWidth()) / 2) { // move left
             p.x = 0;
-            removeView(mTinyView);
-            addView(mTinyView, 0);
-
         } else { // move right
             p.x = mScreenWidth;
-            removeView(mTinyView);
-            addView(mTinyView);
         }
         updateLayout(p);
     }