How to refresh a GridView?

Question

I have a GridView which is pretty similar to the Google tutorial, except that I want to add the ImageViews on runtime (via a subactivity). The results are okay, but the layout of the View is messed up: The GridView doesn't fill the content of its parent, what do I have to do to design it properly?

Here the code of adding the children:

public void initializeWorkbench(GridView gv, Vector<String> items) {         Prototype.workbench.setDimension(screenWidth, divider.height()+workbenchArea.height());         Prototype.workbench.activateWorkbench();         // this measures the workbench correctly         Log.d(Prototype.TAG, "workbench width: "+Prototype.workbench.getMeasuredWidth());         // 320         Log.d(Prototype.TAG, "workbench height: "+Prototype.workbench.getMeasuredHeight());         // 30         ImageAdapter imgAdapter = new ImageAdapter(this.getContext(), items);         gv.setAdapter(imgAdapter);         gv.measure(screenWidth, screenHeight);         gv.requestLayout();         gv.forceLayout();         Log.d(Prototype.TAG, "gv width: "+gv.getMeasuredWidth());         // 22         Log.d(Prototype.TAG, "gv height: "+gv.getMeasuredHeight());         // 119         Prototype.workbench.setDimension(screenWidth, divider.height()+workbenchArea.height());     } } 

activateWorkbench, setDimension and measure in the workbench (LinearLayout above the GridView):

public void activateWorkbench() {     if(this.equals(Prototype.workbench)) {         this.setOrientation(VERTICAL);         show = true;         measure();     } }  public void setDimension(int w, int h) {     width = w;     height = h;     this.setLayoutParams(new LinearLayout.LayoutParams(width, height));     this.invalidate(); }  private void measure() {     if (this.getOrientation() == LinearLayout.VERTICAL) {         int h = 0;         int w = 0;         this.measureChildren(0, 0);         for (int i = 0; i < this.getChildCount(); i++) {             View v = this.getChildAt(i);             h += v.getMeasuredHeight();             w = (w < v.getMeasuredWidth()) ? v.getMeasuredWidth() : w;         }         if (this.equals(Prototype.tagarea))             height = (h < height) ? height : h;         if (this.equals(Prototype.tagarea))             width = (w < width) ? width : w;     }     this.setMeasuredDimension(width, height); } 

The ImageAdapter constructor:

public ImageAdapter(Context c, Vector<String> items) {     mContext = c;      boolean mExternalStorageAvailable = false;     boolean mExternalStorageWriteable = false;     String state = Environment.getExternalStorageState();      if (Environment.MEDIA_MOUNTED.equals(state)) {         // We can read and write the media         mExternalStorageAvailable = mExternalStorageWriteable = true;     } else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {         // We can only read the media         mExternalStorageAvailable = true;         mExternalStorageWriteable = false;     } else {         // Something else is wrong. It may be one of many other states, but         // all we need         // to know is we can neither read nor write         mExternalStorageAvailable = mExternalStorageWriteable = false;     }      if (mExternalStorageAvailable && mExternalStorageWriteable) {         for (String item : items) {             File f = new File(item);             if (f.exists()) {                 try {                     FileInputStream fis = new FileInputStream(f);                     Bitmap b = BitmapFactory.decodeStream(fis);                     bitmaps.add(b);                     files.add(f);                 } catch (FileNotFoundException e) {                     Log.e(Prototype.TAG, "", e);                 }             }         }     } } 

And the xml layout:

<LinearLayout   xmlns:android="http://schemas.android.com/apk/res/android"              android:layout_width="fill_parent"              android:layout_height="fill_parent"                 android:orientation="vertical"                 android:gravity="bottom"                  android:paddingLeft="0px"                 android:paddingTop="0px"                 android:paddingRight="0px">      <com.unimelb.pt3.ui.TransparentPanel             android:id="@+id/workbench"              android:layout_width="fill_parent"             android:layout_height="10px"             android:paddingTop="0px"             android:paddingLeft="0px"             android:paddingBottom="0px"             android:paddingRight="0px">          <GridView xmlns:android="http://schemas.android.com/apk/res/android"              android:id="@+id/gridview"             android:layout_width="fill_parent"              android:layout_height="fill_parent"             android:columnWidth="90dp"             android:numColumns="auto_fit"             android:verticalSpacing="10dp"             android:horizontalSpacing="10dp"             android:stretchMode="columnWidth"             android:gravity="center" />      </com.unimelb.pt3.ui.TransparentPanel>  </LinearLayout> 

Answer 1

the GridView has an invalidateViews() method.

when you call this method: "all the views to be rebuilt and redrawn." http://developer.android.com/reference/android/widget/GridView.html

i think this is what you need:)