CustomListAdapter Problem in Android? How???
- by Praveen Chandrasekaran
i want to improve the list view's performance.
this is the code for my getView method in my Adapter?
public View getView(int arg0, View text_view_name, ViewGroup parent) {
try {
if (text_view_name == null) {
text_view_name = mInflater.inflate(
R.layout.bs_content_list_item1, null);
text_view_name.setTag(R.id.text1_detail1, text_view_name
.findViewById(R.id.text1_detail1));
text_view_name.setTag(R.id.text3_detail1, text_view_name
.findViewById(R.id.text3_detail1));
text_view_name.setTag(R.id.eve_img_detail1, text_view_name
.findViewById(R.id.eve_img_detail1));
}
text1 = (TextView) text_view_name.getTag(R.id.text1_detail1);
// text2 = (TextView) text_view_name.getTag(R.id.text2);
text3 = (TextView) text_view_name.getTag(R.id.text3_detail1);
img = (ImageView) text_view_name.getTag(R.id.eve_img_detail1);
text1.setText(VAL1[arg0]);
text3.setText(VAL3[arg0]);
if (!mBusy) {
img_value = new URL(VAL4[arg0]);
mIcon11 = BitmapFactory.decodeStream(img_value.openConnection()
.getInputStream());
img.setImageBitmap(mIcon11);
text_view_name.setTag(R.id.eve_img_detail1, null);
} else {
img.setImageResource(R.drawable.icon);
text_view_name.setTag(R.id.eve_img_detail1, text_view_name
.findViewById(R.id.eve_img_detail1));
}
} catch (Exception e) {
name = "Exception in MultiLine_bar_details1 getView";
Log.v(TAG, name + e);
}
return text_view_name;
}
this is the code for scrollstatechanged method:
public void onScrollStateChanged(AbsListView view, int scrollState) {
switch (scrollState) {
case OnScrollListener.SCROLL_STATE_IDLE:
try {
MultiLine_bar_details1.mBusy = false;
int first = view.getFirstVisiblePosition();
int count = view.getCount();
for (int i = 0; i < count; i++) {
ImageView t = (ImageView) view.getChildAt(i);
if (t.getTag(R.id.eve_img_detail1) != null) {
MultiLine_bar_details1.img_value = new URL(
MultiLine_bar_details1.VAL4[first + i]);
MultiLine_bar_details1.mIcon11 = BitmapFactory
.decodeStream(MultiLine_bar_details1.img_value
.openConnection().getInputStream());
MultiLine_bar_details1.img.setImageBitmap(MultiLine_bar_details1.mIcon11);
t.setTag(R.id.eve_img_detail1, null);
}
}
} catch (Exception e) {
Log.v(TAG, "Idle" + e);
}
// mStatus.setText("Idle");
break;
case OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:
MultiLine_bar_details1.mBusy = true;
break;
case OnScrollListener.SCROLL_STATE_FLING:
MultiLine_bar_details1.mBusy = true;
break;
}
}
this is very complicated for me to get the output properly. actually i have the listview with custom adapter. that icons makes the listview scroll very slow.i am getting the images for icons from the image urls. upto this(above code) i can improve the scroll performance of my list view. but the image icons are not proper in the corresponding order. its dynamically changing when i scroll the listview..
i refered the commonsware busy coder guide and this blog.
My very Big question is "How can we access the single view in scrollstatechanged parameter AbsListView? "
what is the problem in it? how to do it better? Any Idea?
