I do not paste all my code. The thread start is in OnClick on some
button as below:
public void onClick(View v) {
if(!thumbnailThread.isAlive()){
thumbnailThread.start();
}
Also has other code to change the jpg file for different image.
But now after check the link
http://android-developers.blogspot.com/2009/05/painless-threading.html,
which i guess is written by you. I use AsyncTask instead. And it works
fine. Thanks for your great blog.
Best Regards
Guoyin Chen
On Jun 16, 11:34 pm, Romain Guy <[email protected]> wrote:
> You MUST NOT touch Views from a background thread. This means calls to
> findViewById() and setImageBitmap() should not be running on the backgorund
> thread in your case.
> Also, you do not start() the thread and you always set the *same* image on
> the ImageView. I doubt you will see much difference :)
>
>
>
>
>
> On Tue, Jun 16, 2009 at 1:38 AM, waterblood <[email protected]> wrote:
>
> > Dear all,
>
> > I cannot make postInvalidate() work in non-UI thread in sdk1.5.
> > Below are my code, let me know if i am wrong in some place. It is
> > supposed to update imageview every seconds. But it never be updated
> > from the bitmap.
>
> > public class ThumbnailActivity extends Activity implements
> > OnClickListener{
> > private static final String TAG = "FSL MM Thumbnail TEST";
> > private Thread thumbnailThread;
> > private boolean thumbnailStoped = false;
>
> > /** Called when the activity is first created. */
> > �...@override
> > public void onCreate(Bundle savedInstanceState) {
> > Log.i(TAG,"ThumbnailActivity onCreate");
> > super.onCreate(savedInstanceState);
> > setContentView(R.layout.thumbnail);
>
> > thumbnailStoped = false;
> > thumbnailThread = new Thread(new Runnable() {
> > public void run() {
> > Log.i(TAG,"***thumbnailThread run***");
> > while(! thumbnailStoped ) {
> > Bitmap bitmap;
> > ImageView thumbimage;
> > thumbimage = (ImageView)findViewById
> > (R.id.thumbnail_image);
> > bitmap = BitmapFactory.decodeFile("/sdcard/
> > some.jpeg");
> > if(bitmap == null)
> > Log.i(TAG,"Error!not get bitmap
> > from .jpg");
> > thumbimage.setImageBitmap(bitmap);
> > thumbimage.postInvalidate();
>
> > Log.i(TAG, "***thumbnailThread
> > continue running***");
> > SystemClock.sleep
> > (1000);
> > }
> > });
>
> > }
>
> > }
>
> > the xml of layout as below:
>
> > <?xml version="1.0" encoding="utf-8"?>
> > <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/
> > android"
> > android:layout_width="fill_parent"
> > android:layout_height="fill_parent">
>
> > <Button
> > android:id="@+id/thumbnail_autopreview_button"
> > android:layout_width="wrap_content"
> > android:layout_height="wrap_content"
> > android:layout_alignParentLeft="true"
> > android:layout_marginTop="8dip"
> > android:layout_marginLeft="10dip"
> > android:text="Auto"
> > />
>
> > <Button
> > android:id="@+id/thumbnail_nextimage_button"
> > android:layout_width="wrap_content"
> > android:layout_height="wrap_content"
> > android:layout_toRightOf="@id/thumbnail_autopreview_button"
> > android:layout_alignTop="@id/thumbnail_autopreview_button"
> > android:layout_marginLeft="10dip"
> > android:text="Next"
> > />
>
> > <Button
> > android:id="@+id/thumbnail_stoppreview_button"
> > android:layout_width="wrap_content"
> > android:layout_height="wrap_content"
> > android:layout_toRightOf="@id/thumbnail_nextimage_button"
> > android:layout_alignTop="@id/thumbnail_nextimage_button"
> > android:layout_marginLeft="10dip"
> > android:text="Stop"
> > />
>
> > <TextView
> > android:id="@+id/filename_label"
> > android:layout_width="fill_parent"
> > android:layout_height="wrap_content"
> > android:text="File: /sdcard/hello.mp4"
> > android:layout_below="@id/thumbnail_stoppreview_button"
> > />
>
> > <ImageView
> > android:id="@+id/thumbnail_image"
> > android:layout_width="fill_parent"
> > android:layout_height="fill_parent"
> > android:layout_marginLeft="4dip"
> > android:layout_marginRight="2dip"
> > android:layout_marginTop="8dip"
> > android:layout_below="@id/filename_label"
> > />
> > </RelativeLayout>
>
> > Best Regards
> > Guoyin Chen
>
> --
> Romain Guy
> Android framework engineer
> [email protected]
>
> Note: please don't send private questions to me, as I don't have time to
> provide private support. All such questions should be posted on public
> forums, where I and others can see and answer them
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