Below is our test project:
public class AndroidTest extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LinearLayout ll = new LinearLayout(this);
final TextView tv = new TextView(this);
tv.setText("XXXkl;dfjasjkldfjksdhfjksdfhasdasdasdasdasdasdasdasdksjdf");
tv.setFocusable(true);
tv.setClickable(true);
tv.setSingleLine();
tv.setEllipsize(TruncateAt.MARQUEE);
tv.setTextColor(Color.WHITE);
tv.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
tv.setSelected(true);
}
});
ll.addView(tv, new
LinearLayout.LayoutParams(100,LayoutParams.WRAP_CONTENT));
ll.addView(new TempView(this));
setContentView(ll);
}
private class TempView extends ImageView {
public TempView(Context context) {
super(context);
setBackgroundResource(R.drawable.icon);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Log.i("ImageView",
"ImageViewImageViewImageViewImageViewImageView");
}
}
}
It's very strait and when clicking textview to start scrolling text,
TempView's onDrawing is keeping to be called!
However, we used Dev Tool ->show screen update to check redraw area
and saw only textview flashing!
Who can tell me why!
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