Question

I'm using a Custom list view to create a list view that contains a switch and a text view on each row. Each row is created from an xml file named row.xml and the list view is inside the main activity xml file. These 2 xml files can be seen below.

HomeActivity.xml

<TreeView>
    <TreeView.Resources>
        <Style TargetType="TreeViewItem">
            <Setter Property="Tag" Value="{Binding RelativeSource={RelativeSource Ancestortype={x:Type TreeView}},Path=DataContext.anyobjectofViewmodel}"/>
        </Style>
    </TreeView.Resources>
............
............
</TreeView>

row.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:background="#0099cc" tools:context=".Activities.HomeActivity">

<RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    android:background="#ff69539d">

    <ListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/listView"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="120dp"
        android:layout_below="@+id/fullscreen_content_controls"/>

</RelativeLayout>

I use a custom list adapter to populate the listview with the text for the textfields. This can be seen below.

customlistAdapter

<?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:orientation="vertical" >

    <Switch
        android:layout_width="wrap_content"
        android:layout_height="fill_parent"
        android:id="@+id/switch"
        android:checked="false"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginLeft="10dp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Switch Name"
        android:id="@+id/textView"
        android:layout_alignBottom="@+id/switch"
        android:layout_toRightOf="@+id/switch"
        android:layout_marginLeft="20dp"
        android:layout_marginStart="20dp"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:textColor="#000000" />
</RelativeLayout>

The list adapter is created from the main activity as you can see below.

MainActivity

 public class customListAdapter extends BaseAdapter{

    Context context;
    String[] switchName;
    private static LayoutInflater inflater = null;

    public customListAdapter(Context context, String[] data) {
        // TODO Auto-generated constructor stub
        this.context = context;
        this.switchName = data;
        inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

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

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

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        View vi = convertView;
        if (vi == null)
            vi = inflater.inflate(R.layout.row, null);
        TextView text = (TextView) vi.findViewById(R.id.textView);
        Switch mySwitch = (Switch) vi.findViewById(R.id.switch);
        mySwitch.setTag(position);
        text.setText(switchName[position]);
        return vi;
    }
}

The problem that I am having is being able to access the switches that are created within the custom list adapter from the main activity. I need to be able to maintain a reference to all of the switches from the main activity so that I can change the states. Ideally i'd be able to have a list or array of each of the switches in the mainActivity. Any help would be appreciated.

Answer 1

in your adapter class, add something like:

_id=56bcab3a2df7994c5a073201&created_by=andrewwimley&case_desc=asdf&creation_timestamp=Thu+Feb+11+2016+09%3A39%3A38+GMT-0600+(CST)&date=Thu+Feb+11+2016+09%3A39%3A38+GMT-0600+(CST)&createdBy=andrewwimley&createDateTime=02%2F11%2F2016+09%3A39+am&endDateString=02-10-2016+11%3A59+pm&startDateString=02-10-2016+12%3A00+am&type=schedule_entry&__v=0&meeting_id=56bcab3a2df7994c5a073201&case_name=asdfFFFF&start_time=Thu+Feb+11+2016+09%3A39%3A38+GMT-0600+(Central+Standard+Time)&end_time=Thu+Feb+11+2016+09%3A39%3A38+GMT-0600+(Central+Standard+Time)&desc=asdf&mediator_LawyerIDs%5B%5D=475840&meeting_result=Manual

then in the adapter's private OnCheckChangedListener mOnCheckChangedListener; public void setOnCheckChangedListener( OnCheckChangedListener listener ){ mOnCheckChangedListener = listener; } method, do something like:

getView

then in the activity, so what you want:

mySwitch.setOnCheckChangedListener( mOnCheckChangedListener );

and set it on the adapter:

private OnCheckChangedListener mOnCheckChangedListener = new OnCheckChangedListener(){
  @Override
  onCheckedChanged(CompoundButton buttonView, boolean isChecked){
    // keep a list of what was checked
  }
}

Accessing row items when using a custom list view android

1 个答案: