Using Numberpicker Widget with Strings

Using NumberPicker Widget with Strings

NumberPicker picker = new NumberPicker(this);
picker.setMinValue(0);
picker.setMaxValue(2);
picker.setDisplayedValues( new String[] { "Belgium", "France", "United Kingdom" } );

Using NumberPicker in android but with strings from SQlite

Try this code this is just a List Activity that is backed by a Recycler Adapter the XML for the List Activity is included and the Card Layout XML file

   public class ListActivity extends AppCompatActivity {

   DBHelper helper;
  static List<DBModel>dbList;
   RecyclerView mRecyclerView;
   private static RecyclerView.Adapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_list);

    addListenerOnButtonAdd();
    TextView tvNoData = (TextView)findViewById(R.id.tvNoData);

    setTitle("");// This sets the title of the toolbar
    Toolbar topToolBar = (Toolbar)findViewById(R.id.toolbar);
    setSupportActionBar(topToolBar);
    //topToolBar.setLogo(R.drawable.keyss);// See Notes in MainActivity

    setRequestedOrientation( ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

    helper = new DBHelper(this);
    dbList = new ArrayList<>();
    dbList = helper.getDataFromDB();

    mRecyclerView = (RecyclerView)findViewById(R.id.recycleview);
    mRecyclerView.setHasFixedSize(true);

    // use a linear layout manager
    mLayoutManager = new LinearLayoutManager(this);
    mRecyclerView.setLayoutManager(mLayoutManager);

    // Code below defines the adapter
    mAdapter = new RecyclerAdapter(this,dbList);
    mRecyclerView.setAdapter(mAdapter);

    int sz = dbList.size();
    if(sz == 0){
        tvNoData.setVisibility(View.VISIBLE);
        tvNoData.setText("No Data");
    }
  }

  // This method is called from DetailsActivity and notifies Recycler View 
  that the DB was changed

   of DB and Recycler View
   public static void removeListRow(int position) {
    dbList.remove(position);
    mAdapter.notifyItemRemoved(position);
    mAdapter.notifyItemRangeChanged(position, dbList.size());
   }

    /* this BUTTON is on the ToolBar click to ADD new record */
    private void addListenerOnButtonAdd() {
    // Navigate to DetailsActivity to ADD new DATA
    Toolbar tb = (Toolbar) findViewById( R.id.toolbar );
    setSupportActionBar( tb );

    tb.findViewById( R.id.btnAdd ).setOnClickListener( new 
    View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intentSP = new Intent(ListActivity.this, 
   DetailsActivity.class );
            Bundle extras = new Bundle();
            extras.putString("FROM_LIST_ACTIVITY","true" );
            intentSP.putExtras(extras);
            startActivity( intentSP );
        }
    } );
 }

public void onBackPressed(){
    Intent intent = new Intent( ListActivity.this, MainActivity.class );
    startActivity( intent );
 }
 }

   <?xml version="1.0" encoding="utf-8"?>
  <LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   android:id="@+id/activity_list"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
  android:background="@color/color_lightGray"
   android:orientation="vertical"
   tools:context="com.searchdb.ListActivity">

    <android.support.v7.widget.Toolbar
    android:id="@+id/toolbar"
    android:minHeight="?attr/actionBarSize"
    android:background="@color/color_darkGray"
    android:layout_width="match_parent"
    android:layout_height="64dp">

    <ImageView
        android:id="@+id/imageTB"
        android:layout_width="70dp"
        android:layout_height="wrap_content"
        android:paddingBottom="2dp"
        android:paddingLeft="2dp"
        android:paddingRight="2dp"
        android:paddingTop="4dp"
        android:src="@drawable/keyss" />

    <TextView
        android:text="@string/list_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/toolbar"
        android:layout_alignParentStart="true"
        android:layout_marginStart="30dp"
        android:layout_marginBottom="20dp"
        android:id="@+id/tvLA"
        android:textStyle="bold"
        android:textColor="@color/color_White"
        android:textSize="22sp" />

    <Button
        android:text="@string/add"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/btnAdd"
        android:layout_marginLeft="100dp"
        android:textSize="18sp"
        android:textStyle="bold"
        android:focusable="false"
        android:textColor="@color/color_White"
        android:background="@color/color_Transparent"/>

  </android.support.v7.widget.Toolbar>

  <LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycleview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</LinearLayout>

<LinearLayout
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:text="TextView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/tvNoData"
        android:gravity="center"
        android:layout_marginTop="240dp"
        android:visibility="invisible"
        android:textAllCaps="true"
        android:textStyle="bold"
        android:textSize="30sp"
        android:textColor="@color/color_Red" />
 </LinearLayout>

  </LinearLayout>

  public class RecyclerAdapter extends 
  RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {

  static List<DBModel> dbList;
  static private Context context;
   int sz;

   RecyclerAdapter(Context context, List<DBModel> dbList) {

    RecyclerAdapter.dbList = new ArrayList<>();
    RecyclerAdapter.context = context;
    RecyclerAdapter.dbList = dbList;
 }

 @Override
 public RecyclerAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int 
 viewType) {

    View itemLayoutView = 
 LayoutInflater.from(parent.getContext()).inflate(R.layout.item_row, null);
    // create ViewHolder
    ViewHolder viewHolder = new ViewHolder(itemLayoutView);

    return viewHolder;
}

@Override
public void onBindViewHolder(RecyclerAdapter.ViewHolder holder, int 
 position) {
    holder.rowid.setText(String.valueOf(dbList.get(position).getRowid()));
    holder.station.setText(dbList.get(position).getStation_Name());
    System.out.println("RecyclerAdapter BindViewHolder FIRST position 
 "+position);
}

 @Override
 public int getItemCount() {
    return dbList.size();
 }

 public class ViewHolder extends RecyclerView.ViewHolder implements 
 View.OnClickListener {

    public TextView station, rowid;

    public ViewHolder(View itemLayoutView) {
        super(itemLayoutView);

        rowid = (TextView) itemLayoutView.findViewById(R.id.rvROWID);
        station = (TextView) itemLayoutView.findViewById(R.id.rvSTATION);
        // Attach a click listener to the entire row view
        itemLayoutView.setOnClickListener(this);

    }

   @Override 
    public void onClick(View v) {

       Intent intentN = new Intent(context, DetailsActivity.class);
       Bundle extras = new Bundle();
       extras.putInt("POSITION", getAdapterPosition());
       extras.putString("FROM_LIST_ACTIVITY", "false");
       intentN.putExtras(extras);
       context.startActivity(intentN);
   }
   }
   }

  <?xml version="1.0" encoding="utf-8"?>
 <android.support.v7.widget.CardView 
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:card_view="http://schemas.android.com/apk/res-auto"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:layout_margin="5dp"
  android:orientation="horizontal"
  card_view:cardCornerRadius="5dp"
  card_view:cardUseCompatPadding="true">

   <RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/color_White">

    <TextView
        android:id="@+id/rvROWID"
        android:layout_width="wrap_content"
        android:layout_height="50dp"
        android:gravity="left|center_vertical"
        android:padding="10dp"
        android:textAlignment="center"
        android:text="Position ID"
        android:textColor="@color/color_Black"
        android:layout_marginLeft="10dp"
        android:textStyle="bold"
        android:textSize="16sp"/>

    <TextView
        android:id="@+id/rvSTATION"
        android:layout_width="fill_parent"
        android:layout_height="50dp"
        android:padding="10dp"
        android:gravity="right|center_vertical"
        android:text="Station"
        android:layout_marginLeft="10dp"
        android:textStyle="bold"
        android:textSize="16sp"
        android:textColor="@color/color_Black" />

   </RelativeLayout>

  </android.support.v7.widget.CardView>

Android picker widget for arbitrary strings

The look and feel comes from android.widget.NumberPicker

<NumberPicker
    android:id="@+id/numberPicker1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

Number picker data is not showing correctly android

I have tried many a workarounds to fix it like extending class, in which there is a function getSelectedPos which returns the position on the base of start with function rather than equals or equalignorecase. But due to being private method of NumberPicker class it can't be done. I also tried other work around that did not work.

Finally I got a simple work around for this issue. I created my own function to modify the data to be set on NumberPicker before set on NumberPicker.

modifyDataForNumberPicker(values);
np.setDisplayedValues(values);

private void modifyDataForNumberPicker(String[] dataList){
        int i=0;
        for(String data : dataList){
            int pos = i++;
            dataList[pos] = data+" ";
        }
    } 

This function prevents any string to be substring of any string from the given array to be set on NumberPicker.

NumberPicker doesn't work with keyboard

The NumberPicker wasn't designed for that interaction. When you change the value with the keyboard you're making changes directly to a widget from the NumberPicker and the widget itself doesn't see this change so this is why you end up with the last stored value. To get around this you'll need some hacky code, which isn't really recommended, because you'll need to access the underlying EditText(assuming that the phone maker didn't changed this in the first place):

private EditText findInput(ViewGroup np) {
    int count = np.getChildCount();
    for (int i = 0; i < count; i++) {
        final View child = np.getChildAt(i);
        if (child instanceof ViewGroup) {
            findInput((ViewGroup) child);
        } else if (child instanceof EditText) {
            return (EditText) child;
        }
    }
    return null;
}

and then you'll use this code to set a TextWatcher on the found EditText to see when it's manually modified(and let the NumberPicker know about this change):

EditText input = findInput(np);    
TextWatcher tw = new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before,
                int count) {}

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {}

        @Override
        public void afterTextChanged(Editable s) {
                if (s.toString().length() != 0) {
                    Integer value = Integer.parseInt(s.toString());
                    if (value >= np.getMinValue()) {
                        np.setValue(value);
                    }
                }
        }
    };
input.addTextChangedListener(tw);

Another option would be to make your own implementation of the NumberPicker widget and insert the functionality you target.

How can I add NumberPicker on my Layout from Java code in my Android application?

You need to update this code snippet:

np.scrollBy(0,2);
np.setMinValue(0);
np.setMaxValue(2);

The exception was Array Indexed Out of bound due to setMaxValue(3).

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