Android Open Source - geoar-app Spinner Settings View Field

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License

The source code is released under:

Apache License

Java Source Code

/**
 * Copyright 2012 52North Initiative for Geospatial Open Source Software GmbH
 */*from   w  w w.  ja  v  a 2  s . c o  m*/
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.n52.geoar.settings;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.n52.geoar.newdata.Annotations.Settings.NoValue;
import org.n52.geoar.newdata.Annotations.Settings.NotNull;

import android.content.Context;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;

public abstract class SpinnerSettingsViewField<T> extends Spinner implements
    SettingsViewField<T>, android.widget.AdapterView.OnItemSelectedListener {

  private String noValueText = "No Value";
  private boolean notNull = false;
  private ArrayAdapter<Object> adapter;
  private T selectedValue;

  // Special object for null values
  private Object noValueObject = new Object() {

    @Override
    public String toString() {
      return noValueText;
    }
  };
  private Field field;

  public SpinnerSettingsViewField(Context context, Field field, List<Object> items) {
    super(context);
    this.field = field;
    // Init adapter
    adapter = new ArrayAdapter<Object>(context,
        android.R.layout.simple_spinner_item, items);
    setAdapter(adapter);
    setOnItemSelectedListener(this);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

    // Check annotations
    notNull = field.isAnnotationPresent(NotNull.class);

    if (!notNull) {
      // Null values allowed
      NoValue noValueAnnotation = field.getAnnotation(NoValue.class);
      if (noValueAnnotation != null) {
        noValueText = noValueAnnotation.value();
      }
      adapter.add(noValueObject);
    }
  }

  public SpinnerSettingsViewField(Context context, Field field, Object[] items) {
    this(context, field, new ArrayList<Object>(Arrays.asList(items)));
  }

  @Override
  public boolean validate() {
    if (notNull && selectedValue == null)
      return false;

    return true;
  }

  @Override
  public T getValue() {
    return selectedValue;
  }

  @Override
  public void setValue(T value) {
    selectedValue = value;
    if (value != null) {
      setSelection(adapter.getPosition(value));
    } else {
      setSelection(adapter.getPosition(noValueObject));
    }
  }

  @Override
  public View getView() {
    return this;
  }

  @Override
  public void onItemSelected(AdapterView<?> parent, View view, int position,
      long id) {
    Object item = adapter.getItem(position);
    if (noValueObject == item) {
      selectedValue = null;
    } else {
      selectedValue = (T) item;
    }
  }

  @Override
  public void onNothingSelected(AdapterView<?> parent) {
    selectedValue = null;
  }

  @Override
  public Field getField() {
    return field;
  }

}

Java Source Code List

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