Android Ditches、パート1：SDK

/* * Copyright 2012 David Cesarino de Sousa * * 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 net.davidcesarino.android.common.ui; import android.annotation.TargetApi; import android.app.Activity; import android.app.DatePickerDialog; import android.app.DatePickerDialog.OnDateSetListener; import android.app.Dialog; import android.content.DialogInterface; import android.os.Build; import android.os.Bundle; import android.support.v4.app.DialogFragment; import android.widget.DatePicker; /** * <p>Provides a usable {@link DatePickerDialog} wrapped as a {@link DialogFragment}, * using the compatibility package v4. Its main advantage is handling Issue 34833 * automatically for you.</p> * * <p>Current implementation (because I wanted that way =) ):</p> * * <ul> * <li>Only two buttons, a {@code BUTTON_POSITIVE} and a {@code BUTTON_NEGATIVE}. * <li>Buttons labeled from {@code android.R.string.ok} and {@code android.R.string.cancel}. * </ul> * * <p><strong>Usage sample:</strong></p> * * <pre>class YourActivity extends Activity implements OnDateSetListener * * // ... * * Bundle b = new Bundle(); * b.putInt(DatePickerDialogFragment.YEAR, 2012); * b.putInt(DatePickerDialogFragment.MONTH, 6); * b.putInt(DatePickerDialogFragment.DATE, 17); * DialogFragment picker = new DatePickerDialogFragment(); * picker.setArguments(b); * picker.show(getActivity().getSupportFragmentManager(), "fragment_date_picker");</pre> * * @author davidcesarino@gmail.com * @version 2015.0904 * @see <a href="http://code.google.com/p/android/issues/detail?id=34833">Android Issue 34833</a> * @see <a href="http://stackoverflow.com/q/11444238/489607" * >Jelly Bean DatePickerDialog — is there a way to cancel?</a> * */ public class DatePickerDialogFragment extends DialogFragment { public static final String YEAR = "Year"; public static final String MONTH = "Month"; public static final String DATE = "Day"; private OnDateSetListener mListener; @Override public void onAttach(Activity activity) { super.onAttach(activity); this.mListener = (OnDateSetListener) activity; } @Override public void onDetach() { this.mListener = null; super.onDetach(); } @TargetApi(11) @Override public Dialog onCreateDialog(Bundle savedInstanceState) { Bundle b = getArguments(); int y = b.getInt(YEAR); int m = b.getInt(MONTH); int d = b.getInt(DATE); // Jelly Bean introduced a bug in DatePickerDialog (and possibly // TimePickerDialog as well), and one of the possible solutions is // to postpone the creation of both the listener and the BUTTON_* . // // Passing a null here won't harm because DatePickerDialog checks for a null // whenever it reads the listener that was passed here. >>> This seems to be // true down to 1.5 / API 3, up to 4.1.1 / API 16. <<< No worries. For now. // // See my own question and answer, and details I included for the issue: // // http://stackoverflow.com/a/11493752/489607 // http://code.google.com/p/android/issues/detail?id=34833 // // Of course, suggestions welcome. final DatePickerDialog picker = new DatePickerDialog(getActivity(), getConstructorListener(), y, m, d); if (isAffectedVersion()) { picker.setButton(DialogInterface.BUTTON_POSITIVE, getActivity().getString(android.R.string.ok), new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { DatePicker dp = picker.getDatePicker(); mListener.onDateSet(dp, dp.getYear(), dp.getMonth(), dp.getDayOfMonth()); } }); picker.setButton(DialogInterface.BUTTON_NEGATIVE, getActivity().getString(android.R.string.cancel), new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) {} }); } return picker; } private static boolean isAffectedVersion() { return Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN && Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP; } private OnDateSetListener getConstructorListener() { return isAffectedVersion() ? null : mListener; } } 

 import android.content.Context; import android.database.DataSetObserver; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ListAdapter; import android.widget.SpinnerAdapter; /** * Decorator Adapter to allow a Spinner to show a 'Nothing Selected...' initially * displayed instead of the first choice in the Adapter. */ public class NothingSelectedSpinnerAdapter implements SpinnerAdapter, ListAdapter { protected static final int EXTRA = 1; protected SpinnerAdapter adapter; protected Context context; protected int nothingSelectedLayout; protected int nothingSelectedDropdownLayout; protected LayoutInflater layoutInflater; /** * Use this constructor to have NO 'Select One...' item, instead use * the standard prompt or nothing at all. * @param spinnerAdapter wrapped Adapter. * @param nothingSelectedLayout layout for nothing selected, perhaps * you want text grayed out like a prompt... * @param context */ public NothingSelectedSpinnerAdapter( SpinnerAdapter spinnerAdapter, int nothingSelectedLayout, Context context) { this(spinnerAdapter, nothingSelectedLayout, -1, context); } /** * Use this constructor to Define your 'Select One...' layout as the first * row in the returned choices. * If you do this, you probably don't want a prompt on your spinner or it'll * have two 'Select' rows. * @param spinnerAdapter wrapped Adapter. Should probably return false for isEnabled(0) * @param nothingSelectedLayout layout for nothing selected, perhaps you want * text grayed out like a prompt... * @param nothingSelectedDropdownLayout layout for your 'Select an Item...' in * the dropdown. * @param context */ public NothingSelectedSpinnerAdapter(SpinnerAdapter spinnerAdapter, int nothingSelectedLayout, int nothingSelectedDropdownLayout, Context context) { this.adapter = spinnerAdapter; this.context = context; this.nothingSelectedLayout = nothingSelectedLayout; this.nothingSelectedDropdownLayout = nothingSelectedDropdownLayout; layoutInflater = LayoutInflater.from(context); } @Override public final View getView(int position, View convertView, ViewGroup parent) { // This provides the View for the Selected Item in the Spinner, not // the dropdown (unless dropdownView is not set). if (position == 0) { return getNothingSelectedView(parent); } return adapter.getView(position - EXTRA, null, parent); // Could re-use // the convertView if possible. } /** * View to show in Spinner with Nothing Selected * Override this to do something dynamic... eg "37 Options Found" * @param parent * @return */ protected View getNothingSelectedView(ViewGroup parent) { return layoutInflater.inflate(nothingSelectedLayout, parent, false); } @Override public View getDropDownView(int position, View convertView, ViewGroup parent) { // Android BUG! http://code.google.com/p/android/issues/detail?id=17128 - // Spinner does not support multiple view types if (position == 0) { return nothingSelectedDropdownLayout == -1 ? new View(context) : getNothingSelectedDropdownView(parent); } // Could re-use the convertView if possible, use setTag... return adapter.getDropDownView(position - EXTRA, null, parent); } /** * Override this to do something dynamic... For example, "Pick your favorite * of these 37". * @param parent * @return */ protected View getNothingSelectedDropdownView(ViewGroup parent) { return layoutInflater.inflate(nothingSelectedDropdownLayout, parent, false); } @Override public int getCount() { int count = adapter.getCount(); return count == 0 ? 0 : count + EXTRA; } @Override public Object getItem(int position) { return position == 0 ? null : adapter.getItem(position - EXTRA); } @Override public int getItemViewType(int position) { return 0; } @Override public int getViewTypeCount() { return 1; } @Override public long getItemId(int position) { return position >= EXTRA ? adapter.getItemId(position - EXTRA) : position - EXTRA; } @Override public boolean hasStableIds() { return adapter.hasStableIds(); } @Override public boolean isEmpty() { return adapter.isEmpty(); } @Override public void registerDataSetObserver(DataSetObserver observer) { adapter.registerDataSetObserver(observer); } @Override public void unregisterDataSetObserver(DataSetObserver observer) { adapter.unregisterDataSetObserver(observer); } @Override public boolean areAllItemsEnabled() { return false; } @Override public boolean isEnabled(int position) { return position != 0; // Don't allow the 'nothing selected' // item to be picked. } } 

 Spinner spinner = (Spinner) findViewById(R.id.spinner); ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.planets_array, android.R.layout.simple_spinner_item); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinner.setPrompt("Select your favorite Planet!"); spinner.setAdapter( new NothingSelectedSpinnerAdapter( adapter, R.layout.contact_spinner_row_nothing_selected, // R.layout.contact_spinner_nothing_selected_dropdown, // Optional this));