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A settings dialog box that has one-choice list items

I created a Dialog with list items with one choice:

final CharSequence[] items = {"Red", "Green", "Blue"}; AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle("Colors"); builder.setSingleChoiceItems(items, -1, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int item) { Toast.makeText(getApplicationContext(), items[item], Toast.LENGTH_SHORT).show(); } }); AlertDialog alert = builder.create(); alert.show();

How to customize the layout of this dialog box so that each list item in the dialog box consists of an icon and text. How to create a custom layout for a list in a dialog box?

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3 answers

Steps to create a configuration dialog:

  • Create dialog box layout files, for example:

     <RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android" android:layout_width = "wrap_content" android:layout_height = "wrap_content"> <!-- The Title Bar --> <LinearLayout android:id = "@+id/ dlg_priority_titlebar" android:orientation = "horizontal" android:layout_width = "fill_parent" android:layout_height = "wrap_content" android:layout_alignParentTop = "true"> <ImageView android:src = "@drawable/image" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:layout_margin the "5dip" /> <TextView android:layout_width = "wrap_content android:layout_height = "wrap_content" android:text = "Select Task Priority" android:layout_gravity = "center_vertical" /> </LinearLayout> <ListView android:id = "@+id/dlg_priority_lvw " android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:layout_below = "@+id/dlg_priority_titlebar" the android:background = "@drawable/layout_home_bg"> </ListView> </RelativeLayout>

  • Since the layout in ListView customizable, therefore, to create a layout file for ListView :

     <LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" android:orientation = "horizontal" android:layout_width = "fill_parent" android:layout_height = "fill_parent"> <ImageView android:id = "@+id/list_priority_img" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:layout_gravity = "center_vertical" android:layout_margin = "5dip" /> <TextView android:id = "@+id/list_priority_value" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:layout_gravity = "center_vertical" android:textsize = "28dip" android:textColor = "@drawable/ black" /> </LinearLayout>

  • Create your own Dialog class PriorityDlg inherited from Dialog

    public class PriorityDlg extends dialog <

     private Context context; private ListView dlg_priority_lvw = null; public PriorityDlg(Context context) { super(context); this.context = context; // TODO Auto-generated constructor stub } public PriorityDlg(Context context, int theme) { super(context, theme); this.context = context; } @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.dlg_priority); dlg_priority_lvw = (ListView) findViewById(R.id.dlg_priority_lvw); // ListView SimpleAdapter adapter = new SimpleAdapter(context, getPriorityList(), R.layout.lvw_priority, new String[] { "list_priority_img", "list_priority_value" }, new int[] { R.id.list_priority_img, R.id.list_priority_value }); dlg_priority_lvw.setAdapter(adapter); //ListView dlg_priority_lvw .setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { } }); } private List<HashMap<String, Object>> getPriorityList() { List<HashMap<String, Object>> priorityList = new ArrayList<HashMap<String, Object>>(); HashMap<String, Object> map1 = new HashMap<String, Object>(); map1.put("list_priority_img", R.drawable.priority_not_important); map1.put("list_priority_value", context.getResources().getString( R.string.dlg_priority_not_important)); priorityList.add(map1); HashMap<String, Object> map2 = new HashMap<String, Object>(); map2.put("list_priority_img", R.drawable.priority_general); map2.put("list_priority_value", context.getResources().getString( R.string.dlg_priority_general)); priorityList.add(map2); HashMap<String, Object> map3 = new HashMap<String, Object>(); map3.put("list_priority_img", R.drawable.priority_important); map3.put("list_priority_value", context.getResources().getString( R.string.dlg_priority_important)); priorityList.add(map3); HashMap<String, Object> map4 = new HashMap<String, Object>(); map4.put("list_priority_img", R.drawable.priority_very_important); map4.put("list_priority_value", context.getResources().getString( R.string.dlg_priority_very_important)); priorityList.add(map4); return priorityList; }

    }

  • To create a custom dialog box

     PriorityDlg dlg = new PriorityDlg (SimpleTaskActivity.this, R.style.dlg_priority); dlg.show();

Where R.style.dlg_priority set the dialog uses a style file, just let the dialog remove the title bar and of course you can encode to complete this effect:

 <? Xml version = "1.0" encoding = "utf-8"?> <resources> <style name="dlg_priority" parent="@android:Theme.Dialog"> <item name = "android: windowNoTitle"> true </ item> </ style> </ resources>
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You will basically need to create your own ListAdapter subclassing one of the available adapter classes and dialog (using builder.setAdapter(...) ). If you have an array or a list of objects / objects, subclasses of the ArrayAdapter , you probably want to explore.

In the Adapter subclass, you override the getView(...) method (among others) and fill out the views of your custom layout with data for the position in the list. More specifically, you will want to set an image with ImageView and text on a TextView .

  Create class `MySimpleArrayAdapter` extending from `ArrayAdapter`.

Using the ListView.setOnItemClickListener() method, we get the selected CheckTextView value

 #dialog.xml <?xml version="1.0" encoding="UTF-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@color/whitebox_bg" android:orientation="horizontal" > <CheckedTextView android:id="@+id/textDialog" android:layout_width="fill_parent" android:layout_height="wrap_content" android:checkMark="?android:attr/listChoiceIndicatorSingle" android:gravity="center_vertical" android:maxLines="10" android:singleLine="false" android:text="" android:textAppearance="?android:attr/textAppearanceLarge" android:textColor="#000000" /> </LinearLayout>

To create a custom dialog box

  String [] view_location = {"Red", "Green", "Blue"}; TextView label = (TextView) findViewById(R.id.selected_dept); AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle("Select Location"); ListView listview = new ListView(this); listview.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT)); listview.setCacheColorHint(0); listview.setBackgroundColor(Color.WHITE); if (view_location != null) { MySimpleArrayAdapter choice_arrayAdapter = new MySimpleArrayAdapter(this, view_location,label.getText().toString()); listview.setAdapter(choice_arrayAdapter); builder.setView(listview); listview.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub TextView label = (TextView) findViewById(R.id.selected_dept); label.setText(view_location[arg2]); survedObjectId = view_location_id[arg2]; dInterface.dismiss(); } }); } Dialog dialog = builder.create(); dInterface = dialog; dialog.getWindow().setLayout(200, 400); dialog.show();' // `Extends From ArrayAdapter 'public class MySimpleArrayAdapter extends ArrayAdapter<String> { private final Context context; private final String[] values; private final String selectedText; public MySimpleArrayAdapter(Context context, String[] values, String selectedText) { super(context, R.layout.dialog_text, values); this.context = context; this.values = values; this.selectedText = selectedText; } @Override public View getView(int position, View convertView, ViewGroup parent) { LayoutInflater inflater = (LayoutInflater) context .getSystemService(Context.LAYOUT_INFLATER_SERVICE); View rowView = inflater.inflate(R.layout.dialog_text, parent, false); CheckedTextView textView = (CheckedTextView) rowView.findViewById(R.id.textDialog); textView.setText(values[position]); if(textView.getText().toString().equals(selectedText)) { textView.setChecked(true); } else { textView.setChecked(false); } return rowView; } }'
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Basically, you will have to create your own ListAdapter by subclassing one of the available adapter classes and put it into the dialog (using builder.setAdapter(...) ). If you have an array or a list of elements / objects, the subclass of ArrayAdapter is probably what you want to explore.

In the Adapter subclass, you override the getView(...) method (among others) and fill out the views of your custom layout with data for the position in the list. More specifically, you need to set the image in ImageView and text in TextView.

A pretty good tutorial demonstrating how to implement a custom ArrayAdapter, and it turns out to be close to what you are trying to execute, can be found here . It also shows how to use the ViewHolder / RowWrapper concept.

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Source: https://habr.com/ru/post/911496/

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