Android ListView with different layouts for each row

Since you know how many types of layout you would have - it's possible to use those methods.

getViewTypeCount() - this methods returns information how many types of rows do you have in your list

getItemViewType(int position) - returns information which layout type you should use based on position

Then you inflate layout only if it's null and determine type using getItemViewType.

Look at this tutorial for further information.

To achieve some optimizations in structure that you've described in comment I would suggest:

• Storing views in object called ViewHolder. It would increase speed because you won't have to call findViewById() every time in getView method. See List14 in API demos.
• Create one generic layout that will conform all combinations of properties and hide some elements if current position doesn't have it.

I hope that will help you. If you could provide some XML stub with your data structure and information how exactly you want to map it into row, I would be able to give you more precise advise. By pixel.

I know how to create a custom row + custom array adapter to support a custom row for the entire list view. But how can one listview support many different row styles?

You already know the basics. You just need to get your custom adapter to return a different layout/view based on the row/cursor information being provided.

A ListView can support multiple row styles because it derives from AdapterView:

An AdapterView is a view whose children are determined by an Adapter.

If you look at the Adapter, you'll see methods that account for using row-specific views:

abstract int getViewTypeCount()// Returns the number of types of Views that will be created ...abstract int getItemViewType(int position)// Get the type of View that will be created ...abstract View getView(int position, View convertView, ViewGroup parent)// Get a View that displays the data ...

The latter two methods provide the position so you can use that to determine the type of view you should use for that row.

Of course, you generally don't use AdapterView and Adapter directly, but rather use or derive from one of their subclasses. The subclasses of Adapter may add additional functionality that change how to get custom layouts for different rows. Since the view used for a given row is driven by the adapter, the trick is to get the adapter to return the desired view for a given row. How to do this differs depending on the specific adapter.

For example, to use ArrayAdapter,

• override getView() to inflate, populate, and return the desired view for the given position. The getView() method includes an opportunity reuse views via the convertView parameter.

But to use derivatives of CursorAdapter,

• override newView() to inflate, populate, and return the desired view for the current cursor state (i.e. the current "row") [you also need to override bindView so that widget can reuse views]

However, to use SimpleCursorAdapter,

• define a SimpleCursorAdapter.ViewBinder with a setViewValue() method to inflate, populate, and return the desired view for a given row (current cursor state) and data "column". The method can define just the "special" views and defer to SimpleCursorAdapter's standard behavior for the "normal" bindings.

Look up the specific examples/tutorials for the kind of adapter you end up using.

Take a look in the code below.

First, we create custom layouts. In this case, four types.

even.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:background="#ff500000"    android:layout_height="match_parent">    <TextView        android:id="@+id/text"        android:textColor="@android:color/white"        android:layout_width="match_parent"        android:layout_gravity="center"        android:textSize="24sp"        android:layout_height="wrap_content" /> </LinearLayout>

odd.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:background="#ff001f50"    android:gravity="right"    android:layout_height="match_parent">    <TextView        android:id="@+id/text"        android:textColor="@android:color/white"        android:layout_width="wrap_content"        android:layout_gravity="center"        android:textSize="28sp"        android:layout_height="wrap_content"  /> </LinearLayout>

white.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:background="#ffffffff"    android:gravity="right"    android:layout_height="match_parent">    <TextView        android:id="@+id/text"        android:textColor="@android:color/black"        android:layout_width="wrap_content"        android:layout_gravity="center"        android:textSize="28sp"        android:layout_height="wrap_content"   /> </LinearLayout>

black.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:background="#ff000000"    android:layout_height="match_parent">    <TextView        android:id="@+id/text"        android:textColor="@android:color/white"        android:layout_width="wrap_content"        android:layout_gravity="center"        android:textSize="33sp"        android:layout_height="wrap_content"   /> </LinearLayout>

Then, we create the listview item. In our case, with a string and a type.

public class ListViewItem {        private String text;        private int type;        public ListViewItem(String text, int type) {            this.text = text;            this.type = type;        }        public String getText() {            return text;        }        public void setText(String text) {            this.text = text;        }        public int getType() {            return type;        }        public void setType(int type) {            this.type = type;        }    }

After that, we create a view holder. It's strongly recommended because Android OS keeps the layout reference to reuse your item when it disappears and appears back on the screen. If you don't use this approach, every single time that your item appears on the screen Android OS will create a new one and causing your app to leak memory.

public class ViewHolder {        TextView text;        public ViewHolder(TextView text) {            this.text = text;        }        public TextView getText() {            return text;        }        public void setText(TextView text) {            this.text = text;        }    }

Finally, we create our custom adapter overriding getViewTypeCount() and getItemViewType(int position).

public class CustomAdapter extends ArrayAdapter {        public static final int TYPE_ODD = 0;        public static final int TYPE_EVEN = 1;        public static final int TYPE_WHITE = 2;        public static final int TYPE_BLACK = 3;        private ListViewItem[] objects;        @Override        public int getViewTypeCount() {            return 4;        }        @Override        public int getItemViewType(int position) {            return objects[position].getType();        }        public CustomAdapter(Context context, int resource, ListViewItem[] objects) {            super(context, resource, objects);            this.objects = objects;        }        @Override        public View getView(int position, View convertView, ViewGroup parent) {            ViewHolder viewHolder = null;            ListViewItem listViewItem = objects[position];            int listViewItemType = getItemViewType(position);            if (convertView == null) {                if (listViewItemType == TYPE_EVEN) {                    convertView = LayoutInflater.from(getContext()).inflate(R.layout.type_even, null);                } else if (listViewItemType == TYPE_ODD) {                    convertView = LayoutInflater.from(getContext()).inflate(R.layout.type_odd, null);                } else if (listViewItemType == TYPE_WHITE) {                    convertView = LayoutInflater.from(getContext()).inflate(R.layout.type_white, null);                } else {                    convertView = LayoutInflater.from(getContext()).inflate(R.layout.type_black, null);                }                TextView textView = (TextView) convertView.findViewById(R.id.text);                viewHolder = new ViewHolder(textView);                convertView.setTag(viewHolder);            } else {                viewHolder = (ViewHolder) convertView.getTag();            }            viewHolder.getText().setText(listViewItem.getText());            return convertView;        }    }

And our activity is something like this:

private ListView listView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main); // here, you can create a single layout with a listview        listView = (ListView) findViewById(R.id.listview);        final ListViewItem[] items = new ListViewItem[40];        for (int i = 0; i < items.length; i++) {            if (i == 4) {                items[i] = new ListViewItem("White " + i, CustomAdapter.TYPE_WHITE);            } else if (i == 9) {                items[i] = new ListViewItem("Black " + i, CustomAdapter.TYPE_BLACK);            } else if (i % 2 == 0) {                items[i] = new ListViewItem("EVEN " + i, CustomAdapter.TYPE_EVEN);            } else {                items[i] = new ListViewItem("ODD " + i, CustomAdapter.TYPE_ODD);            }        }        CustomAdapter customAdapter = new CustomAdapter(this, R.id.text, items);        listView.setAdapter(customAdapter);        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView adapterView, View view, int i, long l) {                Toast.makeText(getBaseContext(), items[i].getText(), Toast.LENGTH_SHORT).show();            }        });    }}

now create a listview inside mainactivity.xmllike this

<?xml version="1.0" encoding="utf-8"?><android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:fitsSystemWindows="true"    tools:context="com.example.shivnandan.gygy.MainActivity">    <android.support.design.widget.AppBarLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:theme="@style/AppTheme.AppBarOverlay">        <android.support.v7.widget.Toolbar            android:id="@+id/toolbar"            android:layout_width="match_parent"            android:layout_height="?attr/actionBarSize"            android:background="?attr/colorPrimary"            app:popupTheme="@style/AppTheme.PopupOverlay" />    </android.support.design.widget.AppBarLayout>    <include layout="@layout/content_main" />    <ListView        android:layout_width="match_parent"        android:layout_height="match_parent"        android:id="@+id/listView"        android:layout_alignParentRight="true"        android:layout_alignParentEnd="true"        android:layout_marginTop="100dp" /></android.support.design.widget.CoordinatorLayout>