Java tutorial
/* * Project: NextGIS Mobile * Purpose: Mobile GIS for Android. * Author: Dmitry Baryshnikov (aka Bishop), bishop.dev@gmail.com * Author: NikitaFeodonit, nfeodonit@yandex.com * Author: Stanislav Petriakov, becomeglory@gmail.com * ***************************************************************************** * Copyright (c) 2012-2016 NextGIS, info@nextgis.com * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser Public License for more details. * * You should have received a copy of the GNU Lesser Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package com.nextgis.maplibui.formcontrol; import android.content.Context; import android.content.SharedPreferences; import android.database.Cursor; import android.os.Bundle; import android.provider.SyncStateContract; import android.support.v7.widget.AppCompatSpinner; import android.util.AttributeSet; import android.util.TypedValue; import android.view.ViewGroup; import android.widget.ArrayAdapter; import com.nextgis.maplib.datasource.Field; import com.nextgis.maplib.map.MapBase; import com.nextgis.maplib.map.MapContentProviderHelper; import com.nextgis.maplib.map.NGWLookupTable; import com.nextgis.maplibui.R; import com.nextgis.maplibui.api.IFormControl; import com.nextgis.maplibui.util.ConstantsUI; import com.nextgis.maplibui.util.ControlHelper; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import java.util.HashMap; import java.util.List; import java.util.Map; import static com.nextgis.maplibui.util.ConstantsUI.JSON_ATTRIBUTES_KEY; import static com.nextgis.maplibui.util.ConstantsUI.JSON_DEFAULT_KEY; import static com.nextgis.maplibui.util.ConstantsUI.JSON_FIELD_NAME_KEY; import static com.nextgis.maplibui.util.ConstantsUI.JSON_NGW_ID_KEY; import static com.nextgis.maplibui.util.ConstantsUI.JSON_VALUES_KEY; import static com.nextgis.maplibui.util.ConstantsUI.JSON_VALUE_ALIAS_KEY; import static com.nextgis.maplibui.util.ConstantsUI.JSON_VALUE_NAME_KEY; public class Combobox extends AppCompatSpinner implements IFormControl { protected String mFieldName; protected boolean mIsShowLast; protected Map<String, String> mAliasValueMap; public Combobox(Context context) { super(context); } public Combobox(Context context, AttributeSet attrs) { super(context, attrs); } public Combobox(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override public void init(JSONObject element, List<Field> fields, Bundle savedState, Cursor featureCursor, SharedPreferences preferences) throws JSONException { JSONObject attributes = element.getJSONObject(JSON_ATTRIBUTES_KEY); mFieldName = attributes.getString(JSON_FIELD_NAME_KEY); mIsShowLast = ControlHelper.isSaveLastValue(attributes); setEnabled(ControlHelper.isEnabled(fields, mFieldName)); String lastValue = null; if (ControlHelper.hasKey(savedState, mFieldName)) lastValue = savedState.getString(ControlHelper.getSavedStateKey(mFieldName)); else if (null != featureCursor) { int column = featureCursor.getColumnIndex(mFieldName); if (column >= 0) lastValue = featureCursor.getString(column); } else if (mIsShowLast) lastValue = preferences.getString(mFieldName, null); int defaultPosition = 0; int lastValuePosition = -1; mAliasValueMap = new HashMap<>(); ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<>(getContext(), R.layout.formtemplate_spinner); setAdapter(spinnerArrayAdapter); if (attributes.has(ConstantsUI.JSON_NGW_ID_KEY) && attributes.getLong(ConstantsUI.JSON_NGW_ID_KEY) != -1) { MapContentProviderHelper map = (MapContentProviderHelper) MapBase.getInstance(); if (null == map) throw new IllegalArgumentException("The map should extends MapContentProviderHelper or inherited"); String account = element.optString(SyncStateContract.Columns.ACCOUNT_NAME); long id = attributes.getLong(JSON_NGW_ID_KEY); for (int i = 0; i < map.getLayerCount(); i++) { if (map.getLayer(i) instanceof NGWLookupTable) { NGWLookupTable table = (NGWLookupTable) map.getLayer(i); if (table.getRemoteId() != id || !table.getAccountName().equals(account)) continue; int j = 0; for (Map.Entry<String, String> entry : table.getData().entrySet()) { mAliasValueMap.put(entry.getValue(), entry.getKey()); if (null != lastValue && lastValue.equals(entry.getKey())) lastValuePosition = j; spinnerArrayAdapter.add(entry.getValue()); j++; } break; } } } else { JSONArray values = attributes.optJSONArray(JSON_VALUES_KEY); if (values != null) { for (int j = 0; j < values.length(); j++) { JSONObject keyValue = values.getJSONObject(j); String value = keyValue.getString(JSON_VALUE_NAME_KEY); String value_alias = keyValue.getString(JSON_VALUE_ALIAS_KEY); if (keyValue.has(JSON_DEFAULT_KEY) && keyValue.getBoolean(JSON_DEFAULT_KEY)) defaultPosition = j; if (null != lastValue && lastValue.equals(value)) lastValuePosition = j; mAliasValueMap.put(value_alias, value); spinnerArrayAdapter.add(value_alias); } } } setSelection(lastValuePosition >= 0 ? lastValuePosition : defaultPosition); // The drop down view spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); float minHeight = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 14, getResources().getDisplayMetrics()); setPadding(0, (int) minHeight, 0, (int) minHeight); } @Override public void saveLastValue(SharedPreferences preferences) { preferences.edit().putString(mFieldName, (String) getValue()).commit(); } @Override public boolean isShowLast() { return mIsShowLast; } public String getFieldName() { return mFieldName; } @Override public void addToLayout(ViewGroup layout) { layout.addView(this); } @Override public Object getValue() { String valueAlias = (String) getSelectedItem(); return mAliasValueMap.get(valueAlias); } @Override public void saveState(Bundle outState) { outState.putString(ControlHelper.getSavedStateKey(mFieldName), (String) getValue()); } }