Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>You should use the onDraw() method of the ImageView since that method is called when the view needs to draw its content on screen. <br> <br> I create a new class named MyImageView which extends the ImageView and override the onDraw() method which will trigger a callback to let the listener knows that this view has finished its drawing</p> <pre><code>public class MyImageView extends ImageView { private OnDrawFinishedListener mDrawFinishedListener; public MyImageView(Context context, AttributeSet attrs) { super(context, attrs); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); if (mDrawFinishedListener != null) { mDrawFinishedListener.onOnDrawFinish(); } } public void setOnDrawFinishedListener(OnDrawFinishedListener listener) { mDrawFinishedListener = listener; } public interface OnDrawFinishedListener { public void onOnDrawFinish(); } } </code></pre> <p>In the MainActivity, define 3 bitmaps: one reference to the bitmap which is being used by the ImageView to draw, one for decoding and one reference to the bitmap that is recycled for the next decoding. I reuse the synchronized block from vminorov's answer, but put in different places with explanation in the code comment</p> <pre><code>public class MainActivity extends Activity { private Bitmap mDecodingBitmap; private Bitmap mShowingBitmap; private Bitmap mRecycledBitmap; private final Object lock = new Object(); private volatile boolean ready = true; ArrayList&lt;Integer&gt; images = new ArrayList&lt;Integer&gt;(); int position = 0; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); images.add(R.drawable.black); images.add(R.drawable.blue); images.add(R.drawable.green); images.add(R.drawable.grey); images.add(R.drawable.orange); images.add(R.drawable.pink); images.add(R.drawable.red); images.add(R.drawable.white); images.add(R.drawable.yellow); final MyImageView imageView = (MyImageView) findViewById(R.id.image); imageView.setOnDrawFinishedListener(new OnDrawFinishedListener() { @Override public void onOnDrawFinish() { /* * The ImageView has finished its drawing, now we can recycle * the bitmap and use the new one for the next drawing */ mRecycledBitmap = mShowingBitmap; mShowingBitmap = null; synchronized (lock) { ready = true; lock.notifyAll(); } } }); final Button goButton = (Button) findViewById(R.id.button); goButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Runnable runnable = new Runnable() { @Override public void run() { while (true) { BitmapFactory.Options options = new BitmapFactory.Options(); options.inSampleSize = 1; if (mDecodingBitmap != null) { options.inBitmap = mDecodingBitmap; } mDecodingBitmap = BitmapFactory.decodeResource( getResources(), images.get(position), options); /* * If you want the images display in order and none * of them is bypassed then you should stay here and * wait until the ImageView finishes displaying the * last bitmap, if not, remove synchronized block. * * It's better if we put the lock here (after the * decoding is done) so that the image is ready to * pass to the ImageView when this thread resume. */ synchronized (lock) { while (!ready) { try { lock.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } ready = false; } if (mShowingBitmap == null) { mShowingBitmap = mDecodingBitmap; mDecodingBitmap = mRecycledBitmap; } runOnUiThread(new Runnable() { @Override public void run() { if (mShowingBitmap != null) { imageView .setImageBitmap(mShowingBitmap); /* * At this point, nothing has been drawn * yet, only passing the data to the * ImageView and trigger the view to * invalidate */ } } }); try { Thread.sleep(5); } catch (InterruptedException e) { } position++; if (position &gt;= images.size()) position = 0; } } }; Thread t = new Thread(runnable); t.start(); } }); } } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POBitmapFactory.Options.inBitmap causes tearing when switching ImageView bitmap often
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USBinh Tran
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTBountyClose
    1. COThis does seem to fix the problem, but j__m's answer solved it easier, so I'll award it the correct answer. However, as the bounty was close to ending, I awarded it to you as your solution seems to work too. If I'd seen j__m answer before the bounty went out, I'd probably give it to j__m.
      singulars
      1. PO
      1. USJoakim Berglund
    2. COIn this case, j__m deserve the bounty. I have just raised a bounty with 200 reputation and will assign it to j__m after 24 hours.
      singulars
      1. PO
      1. USBinh Tran
    3. CO@Binh Tran, and you deserves my +1 for this!
      singulars
      1. PO
      1. USVladimir Mironov
 

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