Android, List items cannot be displayed

Question

In my fragment I have a list. I want to display data on my list. This is adapter class:

@Override
    public int getCount() {
        10;
    }

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        Log.e(TAG, "---");
        if (convertView == null) {
            convertView = myInflater.inflate(R.layout.list_topicslist, null);
            holder      = new ViewHolder();

            holder.tvTitle          = (TextView)        convertView.findViewById(R.id.tvTitle);
            holder.tvExcerpt        = (TextView)        convertView.findViewById(R.id.tvExcerpt);
            holder.tvDate           = (TextView)        convertView.findViewById(R.id.tvDate);
            holder.tvAuthor         = (TextView)        convertView.findViewById(R.id.tvAuthor);
            holder.tvComment_Count  = (TextView)        convertView.findViewById(R.id.tvComment_Count);

            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.tvTitle.setText("Title");
        holder.tvExcerpt.setText("Content");
        holder.tvAuthor.setText("Hesam");
        holder.tvComment_Count.setText("Votes:");
        holder.tvDate.setText("1/1/2013");

        return convertView;
    }

This is list_topicslist.xml:

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/rlContainer"
        android:background="@color/White" >


    <RelativeLayout
            android:id="@+id/rlHeader"
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="25dp" android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true" android:background="@color/bg_list_title">
        <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/title_author"
                android:id="@+id/tvAuthor" android:layout_alignParentRight="true" android:layout_centerVertical="true"
                android:layout_margin="@dimen/sideMargin" android:lines="1" android:maxLines="1"/>
        <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/title_date"
                android:id="@+id/tvDate" android:layout_alignParentLeft="true"
                android:layout_margin="@dimen/sideMargin" android:maxLines="1"
                android:lines="1" android:layout_centerVertical="true"/>
    </RelativeLayout>

    <RelativeLayout
            android:id="@+id/rlBody"
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:layout_below="@id/rlHeader" android:clickable="false">

        <ImageView
                android:layout_width="100dp"
                android:layout_height="100dp"
                android:id="@+id/ivPostImage" android:layout_alignParentRight="true"
                android:layout_alignParentTop="true" android:layout_margin="@dimen/sideMargin"
                android:src="@drawable/ic_loading_green"/>
        <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/title_title"
                android:id="@+id/tvTitle" android:layout_toLeftOf="@+id/ivPostImage"
                android:layout_alignTop="@+id/ivPostImage" android:layout_margin="@dimen/sideMargin" android:lines="1"
                android:maxLines="3"/>
        <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/title_excerpt"
                android:id="@+id/tvExcerpt" android:layout_toLeftOf="@+id/ivPostImage"
                android:layout_below="@+id/tvTitle" android:layout_margin="@dimen/sideMargin" android:lines="1"
                android:maxLines="6"/>
    </RelativeLayout>

    <RelativeLayout
            android:id="@+id/rlFooter"
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="25dp"
            android:layout_below="@id/rlBody"
            android:background="@color/bg_list_footer">
        <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/title_comment_count"
                android:id="@+id/tvComment_Count" android:layout_alignParentRight="true"
                android:layout_alignParentTop="true" android:layout_margin="@dimen/sideMargin"
                android:layout_centerVertical="true" android:lines="1" android:maxLines="1"/>
    </RelativeLayout>

</RelativeLayout>

This is xml of fragment:

<?xml version="1.0" encoding="utf-8"?>

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

    <ListView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/lvTopicsList"
            android:scrollbars="none"
            android:scrollingCache="false"
            tools:listitem="@layout/list_topicslist" />
</RelativeLayout>

When I run the application I cannot see my list but Log shows that getView() has been called.

02-28 21:09:10.195: E/*** TopicAdapter ***(16184): ---
02-28 21:09:10.220: D/dalvikvm(16184): GC_CONCURRENT freed 2720K, 33% free 11321K/16775K, paused 2ms+1ms
02-28 21:09:10.235: E/*** TopicAdapter ***(16184): ---
02-28 21:09:10.235: E/*** TopicAdapter ***(16184): ---
02-28 21:09:10.235: E/*** TopicAdapter ***(16184): ---
02-28 21:09:10.240: E/*** TopicAdapter ***(16184): ---
02-28 21:09:10.240: E/*** TopicAdapter ***(16184): ---
02-28 21:09:10.250: E/*** TopicAdapter ***(16184): ---
02-28 21:09:10.275: E/*** TopicAdapter ***(16184): ---
02-28 21:09:10.295: D/dalvikvm(16184): GC_CONCURRENT freed 262K, 31% free 11693K/16775K, paused 2ms+2ms

What and where is my mistake(s)? Any suggestions would be appreciated. Thanks

Thank you Ascorbin, it has so many lines of code and is waste of your time. based on my debug everything is fine and I also can see Log.e(TAG, "---"); in log cat so it shows getView() is working. I have no idea why it doesn't present data. Data is hard coded so it should be displayed! :( — Hesam, Feb 28 '13 at 13:15

score 0 · Answer 1 · edited May 23 '17 at 12:12

0

@Override
 public Object getItem(int position) {
 return position;// change null to position
 }

Have a look at the video here. http://www.youtube.com/watch?v=wDBM6wVEO70. To get a clear idea of memory management have a look at this link http://www.youtube.com/watch?v=_CruQY55HOk.

Have a look at a similar question How to solve GC_concurrent freed?. Looks like your heap is full.

The above links should help you find your way out of trouble. Use a MAT Analyzer to check for any memory leaks.

edited May 23 '17 at 12:12

Community

1
1

answered Feb 28 '13 at 13:07

Raghunandan

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It's not the case because if I change it to whatever integers there is no list item. I'm suspicious to garbage collector because I have so many lines of code that garbage collector is cleaning memory. – Hesam Feb 28 '13 at 13:11
If there is no memory for your app to run, you should get a outofmemory error. Android does mark and sweep. If garbabge collection occurs you see some messages in Logcat like pausing time for GC. – Raghunandan Feb 28 '13 at 13:15

score 0 · Answer 2 · edited May 23 '17 at 11:49

Problem was because of stupid suggestion by lint that asked me to set layout_width to 0dp instead of match-parent. I change my xml code of activity (is not mentioned above) to something like this in activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

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

    <fragment
            android:name="com.kamalan.fragments.Fragment_TopicsList"
            android:id="@+id/fragment"
            android:layout_width="match_parent"   <==================
            android:layout_height="match_parent"
            android:layout_gravity="left|center_vertical" />
</LinearLayout>

Now, application is working fine.

Update

I found this post useful: Why is 0dp considered a performance enhancement?

Android, List items cannot be displayed

2 Answers2