问题
I'm not tied to using an ArrayAdapter but, what I want is a list where each item contains an ImageView, a TextView, and a SeekBar to where I can update the images/texts as well as receive callbacks from each slider (obviously, I need to be able to add and delete rows dynamically).
I've no trouble creating a list that contains these items that is static -> i.e. defined in an xml layout for each row of my list. However, with this, I'm unable to "overwrite the 'onStartTrackingTouch()', 'onProgressChanged()', etc. callback methods". I also can create a list that "contains only seekbars" and I can get the callbacks. The problem is when I bring in the LayoutInflater and then try to add my seekbars to the layout.
After several days of mucking around with it and searching on the internet, I still can't see a solution to have a listactivity that uses a layoutinflator to create composite list rows consisting of an imageview, textview, and seekbar that I can communicate properly with.
Does anyone have a solution? Code?
What I've got so far goes something like:
public class MyListActivity extends ListActivity
{
private class MyView {
public ImageView myImageView = null;
public TextView myTextView = null;
public SeekBar mySeekBar = null;
}
private class MyAdapter extends ArrayAdapter<MyView> {
private ArrayList<MyView> arrayList;
private MyListActivity theContext = null;
public MyAdapter(MyListActivity context,
int textViewResourceId,
ArrayList<MyView> arrayListPassedIn) {
super(context, textViewResourceId, arrayListPassedIn);
this.volumeControls = arrayListPassedIn;
theContext = context;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.dont_think_i_should_need_to_use_a_resource_here_cuz_it_should_be_generated_or_dynamic, parent, false);
}
arrayList.get(position).myImageView = new ImageView(theContext);
arrayList.get(position).myImageView.setBackgroundResource(R.drawable.generic_image);
if(position == 0)
{
arrayList.get(position).mySeekBar = new SeekBar(theContext);
arrayList.get(position).mySeekBar.setMax(100);
arrayList.get(position).mySeekBar.setEnabled(true);
arrayList.get(position).mySeekBar.setOnSeekBarChangeListener(
new SeekBar.OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
Log.d("test", "0th seekbar touched");
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
Log.d("test", "0th seekbar touch lifted");
}
@Override
public void onProgressChanged(SeekBar seekBar, int arg1, boolean fromUser) {
Log.d("test", "0th seekbar progress changed");
}
}
);
}
else
{
arrayList.get(position).mySeekBar = new SeekBar(theContext);
arrayList.get(position).mySeekBar.setMax(100);
arrayList.get(position).mySeekBar.setEnabled(true);
arrayList.get(position).mySeekBar.setOnSeekBarChangeListener(
new SeekBar.OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
Log.d("test", "*not* 0th seekbar touched");
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
Log.d("test", "*not* 0th seekbar touch lifted");
}
@Override
public void onProgressChanged(SeekBar seekBar, int arg1, boolean fromUser) {
Log.d("test", "*not* 0th seekbar progress changed");
}
}
);
}
//***this is the fuzzy part -> I need to be able to obtain the layout for the 'parent ViewGroup' or something
//to where I can somehow add my seekbar (and textview and imageview) and then return the 'parent view'
//that is to say that, this method is required to return a View and I want to return a View that composits
//my imageview, textview, and seekbar. One main problem seems to be that an ArrayAdapter won't allow me to add
//child views dynamically.
final View viewToAdd = arrayList.get(position). mySeekBar;
LinearLayout layout = ???;//new LinearLayout(theContext);
layout.post(new Runnable() {
public void run() {
layout.addView(viewToAdd);
layout.destroyDrawingCache();
layout.buildDrawingCache();
}
});
return ???; //layout.view?? Can I obtain the 'parent view' (the view for the entire row) somehow to return?
}
}
private ArrayList<MyView> myArrayList;
private MyAdapter myAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
try {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout_for_the_list_activity_all_it_contains_is_a_linearlayout_containing_the_listview);
myArrayList = new ArrayList<MyView>();
myArrayList.add(new MyView());
myArrayList.add(new MyView());
mAdapter = new SettingsListViewArrayAdapter(this, R.layout.wtf_not_sure_what_I_should_put_here, this.myArrayList);
setListAdapter(mAdapter);
} catch (NullPointerException e) {
Log.v(getString(R.string.app_name), e.getMessage());
}
}
}
For all I know I'm wayyy off track. From the looks of it, it's not even possible? Someone please help!? (and thanks in advance =-D )
P.S. I really don't care how to solve the problem, I just need to have a 'dynamically resizeable' list where each item contains an imageview, textview, and seekbar and to where I can modify each and receive callbacks for each individual seekbar. (if the solution scales, that would be cool but, most certainly not a requirement as the list will likely usually only contain less than 20 items)
来源：https://stackoverflow.com/questions/6211339/seekbar-in-a-listactivity-using-an-arrayadapter