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POKeep GridView when resuming from sleep mode
 

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  1. POKeep GridView when resuming from sleep mode
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    <p>I got a problem with a quite large GridView.(about 70 children) The GridView works fine if I start it on onCreate or after resumeing after pressing the home button and then return. But when I resume after coming back from sleep mode, my BaseAdapter starts again and ruin the changes I have done to it during runtime. This also make getChildAt() give a NullPointerException if I am calling it just after restart.</p> <p>How can I make it just do what regular onPause(home button) does to the GridView, and avoid that the GridView is wiped out everytime I am resumeing from sleep mode?</p> <p>Edit: I have tried setting a wakelock for my Activity class that calls the BaseAdpter with no luck</p> <p>2.Edit: Since I posted this question I have played around with trying to restore the GridView using this code in onPause:</p> <pre><code> SparseArray&lt;Parcelable&gt; array = new SparseArray&lt;Parcelable&gt;(); gridView.saveHierarchyState(array); bundle = new Bundle(); bundle.putSparseParcelableArray("state", array); </code></pre> <p>And this in onResume:</p> <pre><code> try{ gridView.restoreHierarchyState(bundle.getSparseParcelableArray("state")); } catch(Exception e){ //Most likely first start Log.i("SomeTag", "No GridView state found"); } } </code></pre> <p>The strange thing is everything I seems to have jumped from one place to another on the screen and it is still crashing when I try to getChildAt(). It is also failing to get it after sleep mode.</p> <ol> <li>Edit Here is the code from BaseAdapter getView(Note! some of this code is irrelevant)</li> </ol> <p>public View getView (int position, View convertView, ViewGroup parent) {</p> <pre><code>mParentView = parent; DisplayMetrics metrics = mContext.getResources().getDisplayMetrics(); int width = metrics.widthPixels; int height = metrics.heightPixels; //sets the height for every individual box int box = width/7*6/10; ImageCell v = null; if (convertView == null) { // If it's not recycled, create a new ImageCell. v = new ImageCell (mContext); v.setLayoutParams(new GridView.LayoutParams(box, box)); v.setScaleType(ImageView.ScaleType.CENTER_CROP); v.setPadding(0, 0, 0, 0); } else { v = (ImageCell) convertView; } v.mCellNumber = position; v.mGrid = (GridView) mParentView; v.mEmpty = true; int id = 200; v.setId(++id); String map = str[position]; int pos = position; int up = pos-10; int down = pos+10; int left = pos-1; int right = pos+1; if(up&gt;=0){ above = str[up]; } else{ //Do nothing } if(down&lt;70){ under = str[down]; } else{ //Do nothing } if(left&lt;=-1){ //Do nothing } else{ lefte=str[left]; } if(right&gt;=70){ //Do nothing } else{ righte=str[right]; } //if(left&gt;-1|left!=9|left!=19|left!=29|left!=39|left!=49|left!=59){ // lefte = str[left]; // } // else{ // Log.i("ImageCellAdapter", "Left is trying to break walls "+left); //Do nothing // } if (map.equals("mountain")) { //Checks surroundings to find out witch drawable to set v.setBackgroundResource(R.color.cell_empty); v.mEmpty = false; //All if(above=="mountain"&amp;&amp;under=="mountain"&amp;&amp;lefte=="mountain"&amp;&amp;righte=="mountain"){ v.setImageResource(R.drawable.mountain_full); } //Single else if(above=="mountain"&amp;&amp;under!="mountain"&amp;&amp;lefte!="mountain"&amp;&amp;righte!="mountain"){ v.setImageResource(R.drawable.mountain_down); } else if(above!="mountain"&amp;&amp;under=="mountain"&amp;&amp;lefte!="mountain"&amp;&amp;righte!="mountain"){ v.setImageResource(R.drawable.mountain_up); } else if(above!="mountain"&amp;&amp;under!="mountain"&amp;&amp;lefte!="mountain"&amp;&amp;righte=="mountain"){ v.setImageResource(R.drawable.mountain_left); } else if(above!="mountain"&amp;&amp;under!="mountain"&amp;&amp;lefte=="mountain"&amp;&amp;righte!="mountain"){ v.setImageResource(R.drawable.mountain_right); } //Double else if(above=="mountain"&amp;&amp;under!="mountain"&amp;&amp;lefte!="mountain"&amp;&amp;righte=="mountain"){ v.setImageResource(R.drawable.mountain_left_down); } else if(above!="mountain"&amp;&amp;under=="mountain"&amp;&amp;lefte!="mountain"&amp;&amp;righte=="mountain"){ v.setImageResource(R.drawable.mountain_left_up); } else if(above=="mountain"&amp;&amp;under!="mountain"&amp;&amp;lefte=="mountain"&amp;&amp;righte!="mountain"){ v.setImageResource(R.drawable.mountain_right_down); } else if(above!="mountain"&amp;&amp;under=="mountain"&amp;&amp;lefte=="mountain"&amp;&amp;righte!="mountain"){ v.setImageResource(R.drawable.mountain_up_right); } else if(above!="mountain"&amp;&amp;under!="mountain"&amp;&amp;lefte=="mountain"&amp;&amp;righte=="mountain"){ v.setImageResource(R.drawable.mountain_up_down); } else if(above=="mountain"&amp;&amp;under=="mountain"&amp;&amp;lefte!="mountain"&amp;&amp;righte!="mountain"){ v.setImageResource(R.drawable.mountain_up_down); } //Triple else if(above!="mountain"&amp;&amp;under=="mountain"&amp;&amp;lefte=="mountain"&amp;&amp;righte=="mountain"){ v.setImageResource(R.drawable.mountain_left_right_down); } else if(above=="mountain"&amp;&amp;under=="mountain"&amp;&amp;lefte=="mountain"&amp;&amp;righte!="mountain"){ v.setImageResource(R.drawable.mountain_left_up_down); } else if(above=="mountain"&amp;&amp;under!="mountain"&amp;&amp;lefte=="mountain"&amp;&amp;righte=="mountain"){ v.setImageResource(R.drawable.mountain_left_up_right); } else if(above=="mountain"&amp;&amp;under=="mountain"&amp;&amp;lefte!="mountain"&amp;&amp;righte=="mountain"){ v.setImageResource(R.drawable.mountain_up_right_down); } //None else{ v.setImageResource(R.drawable.mountain); } } else if(map=="start"){ List&lt;String&gt; posOf = Arrays.asList(str); startPos=posOf.indexOf("start"); v.mEmpty=false; v.setBackgroundResource(R.color.cell_empty); getDur(); BitmapDrawable first = (BitmapDrawable)mContext.getResources().getDrawable(R.drawable.gress); BitmapDrawable second =(BitmapDrawable)mContext.getResources().getDrawable(R.drawable.ic_launcher); BitmapDrawable third = (BitmapDrawable)mContext.getResources().getDrawable(R.drawable.gress); BitmapDrawable fourth = (BitmapDrawable)mContext.getResources().getDrawable(R.drawable.ic_launcher); final AnimationDrawable ani = new AnimationDrawable(); ani.addFrame(first, duration); ani.addFrame(second, duration); ani.addFrame(third, duration); ani.addFrame(fourth, duration); ani.setOneShot(true); v.setImageDrawable(ani); checkIfAnimationDone(ani); v.post(new Runnable() { public void run() { ani.start(); } }); } else if(map=="stop"){ v.mEmpty=false; v.setBackgroundResource(R.color.cell_empty); v.setImageResource(R.drawable.ic_launcher); v.setTag(1); } else if(map=="grass"){ v.mEmpty=false; v.setBackgroundResource(R.drawable.gress); } else{ // v.setBackgroundResource (R.color.drop_target_enabled); v.setBackgroundResource (R.color.cell_empty); } //v.mGrid.requestDisallowInterceptTouchEvent (true); //v.setImageResource (R.drawable.hello); // Set up to relay events to the activity. // The activity decides which events trigger drag operations. // Activities like the Android Launcher require a long click to get a drag operation started. return v; </code></pre> <p>}</p> <p>And defining the GridView in onCreate:</p> <pre><code>gridView= new BoxView(this); if(Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.ICE_CREAM_SANDWICH){ w.getDefaultDisplay().getSize(size); Measuredwidth = size.x; Measuredheight = size.y; }else{ Display d = w.getDefaultDisplay(); Measuredwidth = d.getWidth(); Measuredheight = d.getHeight(); } int width = Measuredwidth/7*6; gridView.setLayoutParams(new GridView.LayoutParams(width,LayoutParams.FILL_PARENT, Gravity.CENTER_HORIZONTAL)); gridView.setNumColumns(columns); gridView.setVerticalSpacing(0); gridView.setHorizontalSpacing(0); gridView.setPadding(0, 0, 0, 0); gridView.setId(101); gridView.setSelector(android.R.color.transparent); gridView.setAdapter (new ImageCellAdapter(this, MAP)); </code></pre>
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    1. COYou don't want to keep the huge GridView around when your activity is destroyed, as this will lead to Out-of-Memory situations. How are you populating the view?
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    2. CO@tad I have to have it this big (I am makeing a GridView based game) and it has to be visible all the time and show all children at the same time. Using another View will set me back days.
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    3. COI am asking: how are you populating the view when your Activity starts? From a database, a save file, whatever?
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