Java tutorial
/* * Copyright 2011 Google Inc. * * 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 com.geozen.whiterim.ui.tablet; import android.content.Intent; import android.content.res.Resources; import android.database.Cursor; import android.graphics.Color; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.ListPopupWindow; import android.widget.PopupWindow; import android.widget.TextView; import com.geozen.whiterim.R; import com.geozen.whiterim.provider.SmartTrailSchema.AreasSchema; import com.geozen.whiterim.ui.AreasAdapter; import com.geozen.whiterim.ui.BaseActivity; import com.geozen.whiterim.util.NotifyingAsyncQueryHandler; import com.geozen.whiterim.util.UIUtils; /** * A tablet-specific fragment that is a giant {@link android.widget.Spinner} * -like widget. It shows a {@link ListPopupWindow} containing a list of tracks, * using {@link AreasAdapter}. * * Requires API level 11 or later since {@link ListPopupWindow} is API level * 11+. */ public class AreasDropdownFragment extends Fragment implements NotifyingAsyncQueryHandler.AsyncQueryListener, AdapterView.OnItemClickListener, PopupWindow.OnDismissListener { private boolean mAutoloadTarget = true; private Cursor mCursor; private AreasAdapter mAdapter; private ListPopupWindow mListPopupWindow; private ViewGroup mRootView; private TextView mTitle; private TextView mAbstract; private NotifyingAsyncQueryHandler mHandler; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mHandler = new NotifyingAsyncQueryHandler(getActivity().getContentResolver(), this); mAdapter = new AreasAdapter(getActivity()); if (savedInstanceState != null) { // Prevent auto-load behavior on orientation change. mAutoloadTarget = false; } reloadFromArguments(getArguments()); } public void reloadFromArguments(Bundle arguments) { // Teardown from previous arguments if (mListPopupWindow != null) { mListPopupWindow.setAdapter(null); } if (mCursor != null) { getActivity().stopManagingCursor(mCursor); mCursor = null; } mHandler.cancelOperation(AreasAdapter.AreasQuery._TOKEN); // Load new arguments final Intent intent = BaseActivity.fragmentArgumentsToIntent(arguments); final Uri areaUri = intent.getData(); if (areaUri == null) { return; } // Filter our tracks query to only include those with valid results String[] projection = AreasAdapter.AreasQuery.PROJECTION; String selection = null; // Only show tracks with at least one trail projection = AreasAdapter.AreasQuery.PROJECTION; // Start background query to load trail areas mHandler.startQuery(AreasAdapter.AreasQuery._TOKEN, null, areaUri, projection, selection, null, AreasSchema.DEFAULT_SORT); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { mRootView = (ViewGroup) inflater.inflate(R.layout.fragment_areas_dropdown, null); mTitle = (TextView) mRootView.findViewById(R.id.area_title); mAbstract = (TextView) mRootView.findViewById(R.id.area_abstract); mRootView.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { mListPopupWindow = new ListPopupWindow(getActivity()); mListPopupWindow.setAdapter(mAdapter); mListPopupWindow.setModal(true); mListPopupWindow.setContentWidth(400); mListPopupWindow.setAnchorView(mRootView); mListPopupWindow.setOnItemClickListener(AreasDropdownFragment.this); mListPopupWindow.show(); mListPopupWindow.setOnDismissListener(AreasDropdownFragment.this); } }); return mRootView; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); } /** {@inheritDoc} */ public void onQueryComplete(int token, Object cookie, Cursor cursor) { if (getActivity() == null || cursor == null) { return; } mCursor = cursor; getActivity().startManagingCursor(mCursor); // If there was a last-opened track, load it. Otherwise load the first // track. cursor.moveToFirst(); String lastAreaID = UIUtils.getLastUsedAreaId(getActivity()); if (lastAreaID != null) { while (!cursor.isAfterLast()) { if (lastAreaID.equals(cursor.getString(AreasAdapter.AreasQuery.AREA_ID))) { break; } cursor.moveToNext(); } if (cursor.isAfterLast()) { loadArea(null, mAutoloadTarget); } else { loadArea(cursor, mAutoloadTarget); } } else { loadArea(null, mAutoloadTarget); } mAdapter.changeCursor(mCursor); } /** {@inheritDoc} */ public void onItemClick(AdapterView<?> parent, View view, int position, long id) { final Cursor cursor = (Cursor) mAdapter.getItem(position); loadArea(cursor, true); if (cursor != null) { UIUtils.setLastUsedAreaId(getActivity(), cursor.getString(AreasAdapter.AreasQuery.AREA_ID)); } else { UIUtils.setLastUsedAreaId(getActivity(), AreasSchema.ALL_AREAS_ID); } if (mListPopupWindow != null) { mListPopupWindow.dismiss(); } } public void loadArea(Cursor cursor, boolean loadTargetFragment) { //final String areaId; final int areaColor; final Resources res = getResources(); if (cursor != null) { String colorStr = cursor.getString(AreasAdapter.AreasQuery.AREA_COLOR); areaColor = Color.parseColor(colorStr); //areaId = cursor.getString(AreasAdapter.AreasQuery.AREA_ID); mTitle.setText(cursor.getString(AreasAdapter.AreasQuery.AREA_NAME)); // mAbstract.setText(cursor.getString(AreasAdapter.AreasQuery.TRACK_ABSTRACT)); } else { areaColor = res.getColor(R.color.all_area_color); //areaId = AreasSchema.ALL_AREAS_ID; mTitle.setText(R.string.all_trails_title); mAbstract.setText(R.string.all_trails_subtitle); } boolean isDark = UIUtils.isColorDark(areaColor); mRootView.setBackgroundColor(areaColor); if (isDark) { mTitle.setTextColor(res.getColor(R.color.body_text_1_inverse)); mAbstract.setTextColor(res.getColor(R.color.body_text_2_inverse)); mRootView.findViewById(R.id.area_dropdown_arrow) .setBackgroundResource(R.drawable.area_dropdown_arrow_light); } else { mTitle.setTextColor(res.getColor(R.color.body_text_1)); mAbstract.setTextColor(res.getColor(R.color.body_text_2)); mRootView.findViewById(R.id.area_dropdown_arrow) .setBackgroundResource(R.drawable.area_dropdown_arrow_dark); } if (loadTargetFragment) { final Intent intent = new Intent(Intent.ACTION_VIEW); intent.setData(AreasSchema.CONTENT_URI); ((BaseActivity) getActivity()).openActivityOrFragment(intent); } } public void onDismiss() { mListPopupWindow = null; } }