I have extended an ImageView and calling a method of ImageView from outside class , inside a Thread. Inside the method I have tried using invalidate postValidate and everything but it never called the onDraw method , is it something to do with the calling method-
public class TestImageView extends ImageView {
public FacePreviewImageView(Context context) {
super(context);
}
public void process(String strImageFilePath) {
//doing some operation
invalidate();
}
@SuppressLint("DrawAllocation")
@Override
protected void onDraw(Canvas canvas) {
Log.i("CAME INSIDE ", ""+faces.total());
if(faces.total()>0){
Paint paint = new Paint();
paint.setColor(Color.RED);
paint.setTextSize(20);
String s = "Processed Face";
float textWidth = paint.measureText(s);
canvas.drawText(s, (getWidth() - textWidth) / 2, 20, paint);
CvRect r = new CvRect(cvGetSeqElem(faces, 0));
int x = r.x(), y = r.y(), w = r.width(), h = r.height();
canvas.drawRect(new Rect(x, y, x+w, y+h), paint);
}
super.onDraw(canvas);
}
}
and my calling method looks like -
new Handler().post(new Runnable() {
@Override
public void run() {
// Code here will run in UI thread
((TestImageView )imageView).process(pictureFile.getAbsolutePath());
}
});
One more point to add-
I tried to add this view directly inside layout file-
<FrameLayout
android:id="@+id/ll2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="0.5"
android:orientation="horizontal" >
<com.example.defaultfacetracker.TestImageView
android:id="@+id/imageView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</FrameLayout>
but its throwing exception while launching. SO I finally changed the code to-
<ImageView
android:id="@+id/imageView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:src="@android:drawable/toast_frame" />
And in a class I am just creating a new instance of TestImageView to work for.
If that is the reason to do something here.