Databases
StackOverflow2013
Postsdbo
PONullpointerException when trying to save the current Android app view as image
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PONullpointerException when trying to save the current Android app view as image
    primarykey
    data
    text
    <p>Hi StackOverflow community,</p> <p>in my application I'd like to have a button which allows the user to capture the current view.</p> <p>For that reason, I've written the following method (oriented towards: <a href="https://stackoverflow.com/questions/3107527/android-save-view-to-jpg-or-png">Android save view to jpg or png</a> ):</p> <pre><code>private LinearLayout container; public void createImageOfCurrentView(View v) { if (isExternalStoragePresent()) { container = (LinearLayout) findViewById(R.id.container); container.setDrawingCacheEnabled(true); Bitmap b = container.getDrawingCache(); File dir = new File(Environment.getExternalStorageDirectory().getPath() + "/" + getPackageName() + "/"); dir.mkdirs(); File file = new File(dir, "image.jpg"); FileOutputStream fos; try { fos = new FileOutputStream(file); b.compress(CompressFormat.JPEG, 95, fos); // NullPointerException! Toast.makeText(this, "The current view has been succesfully saved " + "as image.", Toast.LENGTH_SHORT).show(); } catch (FileNotFoundException e) { Toast.makeText(this, "Unfortunatly an error occured and this " + "action failed.", Toast.LENGTH_SHORT).show(); } } else { Toast.makeText(this, "Bacause of lacking access to the storage " + "of this device, the current view couldn't be saved as an image.", Toast.LENGTH_LONG).show(); } } </code></pre> <p>The problem is according to <code>LogCat</code> that there occured a <code>NullPointerException</code> when trying to create the <code>jpeg</code>. So probably the method <code>container.getDrawingCache()</code> is not working. On the phone the file is generated. However with the size of 0 bytes and no visible image. I would appreciate any suggestions what I have to do in order to make it work as I want.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. USuser1335772
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. PONullpointerException when trying to save the current Android app view as image
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    2. VO
      singulars
      1. PONullpointerException when trying to save the current Android app view as image
      1. USwendigo
      1. VTFavorite
    3. VO
      singulars
      1. PONullpointerException when trying to save the current Android app view as image
      1. USdotcs
      1. VTFavorite
    1. COmake sure **b** is not null..
      singulars
      1. PONullpointerException when trying to save the current Android app view as image
      1. USngesh
    2. COWhat do you intent with this line? `container.findViewById(R.id.container);` I'm not familiar with using `findviewbyid` like this, but the common questions (like "is `R.id.container` in the current set view?) probably apply?
      singulars
      1. PONullpointerException when trying to save the current Android app view as image
      1. USNanne
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload