Create NumberPicker dialog in preference

Question

I am trying to create a NumberPicker dialog in my preference screen. I have already made one following this:https://stackoverflow.com/a/5533295/2442638

However, for

Answer 1

return a LinearLayout in onCreateDialogView rather than NumberPicker as below:

@Override
protected View onCreateDialogView() {
    numberPicker = new NumberPicker(getContext());
    numberPicker.setMinValue(1);
    numberPicker.setMaxValue(12);
    numberPicker.setWrapSelectorWheel(false);
    numberPicker.setValue(lastValue);

    LinearLayout.LayoutParams pickerParams = new LinearLayout.LayoutParams
            (LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    pickerParams.gravity = Gravity.CENTER;
    numberPicker.setLayoutParams(pickerParams);

    LinearLayout layout = new LinearLayout(getContext());
    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams
            (LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
    layout.setOrientation(LinearLayout.VERTICAL);
    layout.setLayoutParams(params);

    layout.addView(numberPicker);
    return layout;

    //return numberPicker;
}

Answer 2

This is more a workaround than a solution, but i hope it helps. Adding a dummy textView solved the problem. I got exactly the same problem.

My xml File:

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

    <TextView
        android:id="@+id/textDummyEmpty"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/textDummyEmpty" />

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

</LinearLayout>

and

android:text="@string/textDummyEmpty" 

is an empty String. Maybe its also enough to use just a view instead of a textView.

Answer 3

I solved this by using the CyanogenMod number picker. Java file:

https://github.com/CyanogenMod/android_packages_apps_Trebuchet/blob/cm-10.2/src/com/cyanogenmod/trebuchet/preference/NumberPickerPreference.java

XML file: https://github.com/CyanogenMod/android_packages_apps_Trebuchet/blob/cm-10.2/res/layout/number_picker_dialog.xml

Attributes: https://github.com/CyanogenMod/android_packages_apps_Trebuchet/blob/cm-10.2/res/values/attrs.xml#L158

Answer 4

Here is an example of simple, but working NumberPickerPreference, saving integer value between 1 and 100:

NumberPickerPreference.java:

public class NumberPickerPreference extends DialogPreference {
    private NumberPicker mPicker;
    private Integer mNumber = 0;

    public NumberPickerPreference(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public NumberPickerPreference(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        setPositiveButtonText(android.R.string.ok);
        setNegativeButtonText(android.R.string.cancel);
    }

    @Override
    protected View onCreateDialogView() {
        mPicker = new NumberPicker(getContext());
        mPicker.setMinValue(1);
        mPicker.setMaxValue(100);
        mPicker.setValue(mNumber);
        return mPicker;
    }

    @Override
    protected void onDialogClosed(boolean positiveResult) {
        if (positiveResult) {
            // needed when user edits the text field and clicks OK
            mPicker.clearFocus();
            setValue(mPicker.getValue());
        }
    }   

    @Override
    protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
        setValue(restoreValue ? getPersistedInt(mNumber) : (Integer) defaultValue);
    }

    public void setValue(int value) {
        if (shouldPersist()) {
            persistInt(value);
        }

        if (value != mNumber) {
            mNumber = value;
            notifyChanged();
        }
    }

    @Override
    protected Object onGetDefaultValue(TypedArray a, int index) {
        return a.getInt(index, 0);
    }
}