CODEWITHSUNDEEP
androidandroid-listview
deepa
deepa

Reputation: 2494

Imageview in Listview cannot change at runtime in android

I am developing Android Application. In which i am having list view with text and image. i need to set the imageview visible at run time. ie. when i clicked the view it should appear and when i click next view previous view have to disappear and corresponding imageview in clicking view have to appear.

Now i am success in displaying text but i am strucking in appearance of imageview. Inside the onclick of item list i cannot set the resource for imageview

Below is my code.

    public class ListofCategory extends Activity{
ListView listview;
List<String> mycategoryId,mycategoryName;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
                            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.listofcategory);
    listview=(ListView)findViewById(R.id.category_listview);
    mycategoryId=new ArrayList<String>();
    mycategoryName=new ArrayList<String>();
    getData();
    listview.setAdapter(new MyListAdapter(this));
     //setListAdapter(new MyListAdapter(this));
}

    class MyListAdapter extends BaseAdapter{
private Context context;

MyListAdapter(Context context)
{
    this.context=context;

}

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return mycategoryId.size();
}

@Override
public Object getItem(int position) {
    // TODO Auto-generated method stub
    return position;
}

@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return position;
}


@Override
public View getView(final int position, View view, ViewGroup viewgroup) {

     ViewHolder holder = null;
    LayoutInflater inflater =  LayoutInflater.from(context);
            if (view == null) 
            {

              view = inflater.inflate(R.layout.mycategorylist, null);
    holder = new ViewHolder();
    holder.categoryname = (TextView) view.findViewById(R.id.title);
    holder.categorycount = (TextView) view.findViewById(R.id.description);
    holder.arrow=(ImageView)view.findViewById(R.id.arrow_imageview);
    view.setTag(holder);
 }
 else
 {
     holder = (ViewHolder) view.getTag();
 }
     holder.categoryname.setText(mycategoryName.get(position));
     holder.categoryname.setTextSize(18.0f);
     //holder.arrow.setImageResource(R.drawable.arrow);

     view.setOnClickListener(new OnClickListener() {

         @Override
         public void onClick(View v)
         {
            Problem occurs here..  This holder value ask me to change as final but here i cannot make holder to final
             holder.arrow.setImageResource(R.drawable.arrow);
            //finish(); 

         }
     });

 return view;
}


   }
 class ViewHolder
{
    TextView categoryname;
    TextView categorycount;
    ImageView arrow;

}

    }

Please anyone give me a better solution..its very urgent.. Thanks in advance

Upvotes: 1

Views: 1799

Answers (5)

Raz
Raz

Reputation: 9058

Create a final pointer for the imageView.

final ImageView tempView = holder.arrow;

than in the onclick:

tempView.setImageResource(R.drawable.arrow);

Added to the class a field:

MyListAdapter myAdapter;

In the oncreate method do this:

myAdapter = new MyListAdapter(this);
listview.setAdapter(myAdapter);

On the onclick event do this:

view.setOnClickListener(new OnClickListener() {    

     @Override    
     public void onClick(View v)    
     {    
        Problem occurs here..  This holder value ask me to change as final but here i cannot make holder to final    
         tempView.setImageResource(R.drawable.arrow);    
        myAdapter.notifyDataSetChange();    

     }    
 });

That should work.

Upvotes: 1

viv
viv

Reputation: 6177

     public class ListofCategory extends Activity{
ListView listview;
List<String> mycategoryId,mycategoryName;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
                            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.listofcategory);
    listview=(ListView)findViewById(R.id.category_listview);
    mycategoryId=new ArrayList<String>();
    mycategoryName=new ArrayList<String>();
    getData();
    listview.setAdapter(new MyListAdapter(this));
     //setListAdapter(new MyListAdapter(this));
}

    class MyListAdapter extends BaseAdapter{
private Context context;
private ImageView previous;

MyListAdapter(Context context)
{
    this.context=context;

}

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return mycategoryId.size();
}

@Override
public Object getItem(int position) {
    // TODO Auto-generated method stub
    return position;
}

@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return position;
}


@Override
public View getView(final int position, View view, ViewGroup viewgroup) {

     ViewHolder holder = null;
    LayoutInflater inflater =  LayoutInflater.from(context);
            if (view == null) 
            {

              view = inflater.inflate(R.layout.mycategorylist, null);
    holder = new ViewHolder();
    holder.categoryname = (TextView) view.findViewById(R.id.title);
    holder.categorycount = (TextView) view.findViewById(R.id.description);
    holder.arrow=(ImageView)view.findViewById(R.id.arrow_imageview);
    view.setTag(holder);
 }
 else
 {
     holder = (ViewHolder) view.getTag();
 }
     holder.categoryname.setText(mycategoryName.get(position));
     holder.categoryname.setTextSize(18.0f);
     //holder.arrow.setImageResource(R.drawable.arrow);

     view.setOnClickListener(new OnClickListener() {

         @Override
         public void onClick(View v)
         {

            if(previous!=null){

                previous.setVisibility(View.Invisible);
                v.setVisibility(View.Visible);
                previous = v;
        }
         }
     });

 return view;
}


   }
 class ViewHolder
{
    TextView categoryname;
    TextView categorycount;
    ImageView arrow;

}

Upvotes: 0

Rasel
Rasel

Reputation: 15477

 public void onItemClick(AdapterView<?> arg0, View view, int position,
                long id) {
            // TODO Auto-generated method stub


            ImageView image;
            RelativeLayout layout = (RelativeLayout) view;//Layout of mycategorylist
            image = (ImageView) layout.getChildAt(0);//image is added first here.change accordingly
            image.setImageDrawable(....imageId);

    }

Upvotes: 0

Mark Allison
Mark Allison

Reputation: 21909

Try this:

ViewHolder tmpHolder = null;
if( view == null ) {
    .
    .
    .
    tmpHolder = new ViewHolder();
} else {
    tmpHolder = (ViewHolder) view.getTag();
}
final ViewHolder holder = tmpHolder;

view.setOnClickListener(new OnClickListener() {

     @Override
     public void onClick(View v)
     {
         holder.arrow.setImageResource(R.drawable.arrow);
        //finish(); 

     }
 });

Upvotes: 1

Uday
Uday

Reputation: 6023

As far as I can understand,

I think instead of using view onClickListener use, the layout onClickListener which is used in R.layout.mycategorylist.

Or else, you can use holder.categoryname onClickListener or holder.categorycount listeners right.

and You can declare ViewHolder holder ; as global variable in your MyListAdapter right, then there is no issue for declaring final or something.

Hope it helps

Upvotes: 0

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