Android custom layout listview with images

问题

I would like to manage to obtain a listview with dynamic items. I built a row_layout containing an ImageView, and 2 TextViews. When I build the adapter, I want to be able to display the ImageView OR NOT depending on the row number. So I want to have img1 on row 2, img2 on row 3, then img3 on row 5. And on all other rows I do not want any imageView displayed (and also the alignment of the textviews must change filling the empty space left by the ImageView missing).

Is that possible?

I populate my adapter here:

JSONObject json_data;
try {
   int length = lststat.length();
   detalii_client = new Client[length];
   for (int i = 0; i < length; i++) {
     json_data = lststat.getJSONObject(i);
     detalii_client[i] = new Client();
     String categoria = json_data.getString("den");
     if ("1".equals(categoria)){ // row 1
        detalii_client[i].desc ="Some Title";
        detalii_client[i].icon = 0; // here I want NO IMAGE
     }
     if ("2".equals(categoria)){ // row 2
        detalii_client[i].desc ="Some other Title";
        detalii_client[i].icon = 0; // here I want to assign a picture to the imageView
     }
....

I have a class:

public class Client {
    public int icon;
            public String desc;
            public String title;
            public String id;
            public Client(){
                super();
            }

            public Client(int icon, String desc, String title, String id) {
                super();
                this.icon = icon;
                this.desc = desc;
                this.id = id;
                this.title= title;
            }
    }

and a custom Adapter class

public class ClientAdapter extends ArrayAdapter<Client>{

    Context context;
    int layoutResourceId;   
    Client data[] = null;

    public ClientAdapter(Context context, int layoutResourceId, Client[] data) {
        super(context, layoutResourceId, data);
        this.layoutResourceId = layoutResourceId;
        this.context = context;
        this.data = data;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View row = convertView;
        ClientHolder holder = null;

        if(row == null)
        {
            LayoutInflater inflater = ((Activity)context).getLayoutInflater();
            row = inflater.inflate(layoutResourceId, parent, false);

            holder = new ClientHolder();
            holder.hldIcon = (ImageView)row.findViewById(R.id.imgIconx);
            holder.hldTitle = (TextView)row.findViewById(R.id.txtTitlu);
            holder.hldDesc = (TextView)row.findViewById(R.id.txtDescr);
            holder.hldId = (TextView)row.findViewById(R.id.txtId);
            row.setTag(holder);
        }
        else
        {
            holder = (ClientHolder)row.getTag();
        }

        Client clientul = data[position];
        holder.hldTitle.setText(clientul.title);
        holder.hldDesc.setText(clientul.desc);
        holder.hldId.setText(clientul.id);
        holder.hldIcon.setImageResource(clientul.icon);

        return row;
    }

    static class ClientHolder
    {
        ImageView hldIcon;
        TextView hldTitle;
        TextView hldId;
        TextView hldDesc;
    }    
}   

Also I have an activity layout (irrelevant) One listview and a bottom button (relativeLayout). And I have a row_layout which I use to display the rows.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

        <ImageView
            android:id="@+id/imgIconx"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/client64" />

        <LinearLayout
            android:layout_width="145dp"
            android:layout_height="match_parent"
            android:layout_weight="1.50"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/txtDescr"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:text="@string/lbl_loc"
                android:textColor="@color/darkred"
                android:textSize="@dimen/descriere_detaliu"
                android:typeface="serif" />

            <TextView
                android:id="@+id/txtTitlu"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/lbl_client"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:textColor="@color/darkred"
                android:textSize="18sp"
                android:textStyle="normal"
                android:typeface="serif" />

            <TextView
                android:id="@+id/txtId"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/lbl_idviz"
                android:textAppearance="?android:attr/textAppearanceSmall"
                android:textColor="@color/white" />
        </LinearLayout>

</RelativeLayout>

• Where can I assign my pictures to my ImageView?
• And How can I make the ImageView "disappear" for certain rows?

Thank you

回答1:

Where can I assign my pictures to my ImageView?

Do this in the getView() method of your Adapter. It looks like you are doing that now.

And How can I make the ImageView "disappear" for certain rows?

Use anif statement and if it isn't the correct row (position) call

holder.hldIcon.setVisibility(View.INVISIBLE)`

or

holder.hldIcon.setVisibility(View.GONE)

depending on what you want

来源：https://stackoverflow.com/questions/17982735/android-custom-layout-listview-with-images