1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License 15 */ 16 17 package com.example.android.apis.content; 18 19 import android.app.Activity; 20 import android.app.LoaderManager; 21 import android.content.BroadcastReceiver; 22 import android.content.Context; 23 import android.content.CursorLoader; 24 import android.content.Intent; 25 import android.content.IntentFilter; 26 import android.content.Loader; 27 import android.content.SharedPreferences; 28 import android.database.Cursor; 29 import android.database.CursorWrapper; 30 import android.os.Bundle; 31 import android.provider.ContactsContract; 32 import android.view.View; 33 import android.view.ViewGroup; 34 import android.widget.Button; 35 import android.widget.CursorAdapter; 36 import android.widget.LinearLayout; 37 import android.widget.ListView; 38 import android.widget.TextView; 39 import android.widget.Toast; 40 41 /** 42 * Demonstrates selecting contacts that have changed since a certain time. 43 */ 44 public class ChangedContacts extends Activity implements LoaderManager.LoaderCallbacks<Cursor> { 45 46 private static final String CLASS = ChangedContacts.class.getSimpleName(); 47 48 private static final String PREF_KEY_CHANGE = "timestamp_change"; 49 private static final String PREF_KEY_DELETE = "timestamp_delete"; 50 51 private static final int ID_CHANGE_LOADER = 1; 52 private static final int ID_DELETE_LOADER = 2; 53 54 /** 55 * To see this in action, "clear data" for the contacts storage app in the system settings. 56 * Then come into this app and hit any of the delta buttons. This will cause the contacts 57 * database to be re-created. 58 */ 59 private BroadcastReceiver mReceiver = new BroadcastReceiver() { 60 @Override 61 public void onReceive(Context context, Intent intent) { 62 Toast toast = Toast.makeText(context, "Contacts database created.", Toast.LENGTH_SHORT); 63 toast.show(); 64 } 65 }; 66 67 private DeleteAdapter mDeleteAdapter; 68 private ChangeAdapter mChangeAdapter; 69 private long mSearchTime; 70 private TextView mDisplayView; 71 private ListView mList; 72 private Button mDeleteButton; 73 private Button mChangeButton; 74 75 @Override 76 protected void onCreate(Bundle savedInstanceState) { 77 super.onCreate(savedInstanceState); 78 79 mDeleteAdapter = new DeleteAdapter(this, null, 0); 80 mChangeAdapter = new ChangeAdapter(this, null, 0); 81 82 LinearLayout main = new LinearLayout(this); 83 main.setOrientation(LinearLayout.VERTICAL); 84 85 mChangeButton = new Button(this); 86 mChangeButton.setText("Changed since " + getLastTimestamp(0, PREF_KEY_CHANGE)); 87 mChangeButton.setOnClickListener(new View.OnClickListener() { 88 @Override 89 public void onClick(View v) { 90 changeClick(); 91 } 92 }); 93 94 mDeleteButton = new Button(this); 95 mDeleteButton.setText("Deleted since " + getLastTimestamp(0, PREF_KEY_DELETE)); 96 mDeleteButton.setOnClickListener(new View.OnClickListener() { 97 @Override 98 public void onClick(View v) { 99 deleteClick(); 100 } 101 }); 102 103 main.addView(mChangeButton); 104 main.addView(mDeleteButton); 105 106 mDisplayView = new TextView(this); 107 mDisplayView.setPadding(5, 5, 5, 5); 108 main.addView(mDisplayView); 109 110 mList = new ListView(this); 111 mList.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, 112 ViewGroup.LayoutParams.WRAP_CONTENT, 1f)); 113 main.addView(mList); 114 115 setContentView(main); 116 } 117 118 @Override 119 protected void onResume() { 120 super.onResume(); 121 IntentFilter filter = new IntentFilter(); 122 filter.addAction(ContactsContract.Intents.CONTACTS_DATABASE_CREATED); 123 registerReceiver(mReceiver, filter); 124 } 125 126 @Override 127 protected void onPause() { 128 super.onPause(); 129 unregisterReceiver(mReceiver); 130 } 131 132 private void changeClick() { 133 mChangeAdapter.swapCursor(null); 134 LoaderManager manager = getLoaderManager(); 135 manager.destroyLoader(ID_DELETE_LOADER); 136 manager.restartLoader(ID_CHANGE_LOADER, null, this); 137 } 138 139 private void deleteClick() { 140 mChangeAdapter.swapCursor(null); 141 LoaderManager manager = getLoaderManager(); 142 manager.destroyLoader(ID_CHANGE_LOADER); 143 manager.restartLoader(ID_DELETE_LOADER, null, this); 144 } 145 146 private void saveLastTimestamp(long time, String key) { 147 SharedPreferences pref = getSharedPreferences(CLASS, Context.MODE_PRIVATE); 148 SharedPreferences.Editor editor = pref.edit(); 149 editor.putLong(key, time); 150 editor.commit(); 151 } 152 153 private long getLastTimestamp(long time, String key) { 154 SharedPreferences pref = getSharedPreferences(CLASS, Context.MODE_PRIVATE); 155 return pref.getLong(key, time); 156 } 157 158 @Override 159 public Loader<Cursor> onCreateLoader(int id, Bundle args) { 160 switch(id) { 161 case ID_CHANGE_LOADER: 162 return getChangeLoader(); 163 case ID_DELETE_LOADER: 164 return getDeleteLoader(); 165 } 166 return null; 167 } 168 169 private CursorLoader getChangeLoader() { 170 String[] projection = new String[]{ 171 ContactsContract.Data._ID, 172 ContactsContract.Data.CONTACT_ID, 173 ContactsContract.Data.DISPLAY_NAME, 174 ContactsContract.Data.CONTACT_LAST_UPDATED_TIMESTAMP 175 }; 176 177 mSearchTime = getLastTimestamp(0, PREF_KEY_CHANGE); 178 179 String selection = ContactsContract.Data.CONTACT_LAST_UPDATED_TIMESTAMP + " > ?"; 180 String[] bindArgs = new String[]{mSearchTime + ""}; 181 return new CursorLoader(this, ContactsContract.Data.CONTENT_URI, projection, 182 selection, bindArgs, ContactsContract.Data.CONTACT_LAST_UPDATED_TIMESTAMP 183 + " desc, " + ContactsContract.Data.CONTACT_ID + " desc"); 184 } 185 186 private CursorLoader getDeleteLoader() { 187 String[] projection = new String[]{ 188 ContactsContract.DeletedContacts.CONTACT_ID, 189 ContactsContract.DeletedContacts.CONTACT_DELETED_TIMESTAMP 190 }; 191 192 mSearchTime = getLastTimestamp(0, PREF_KEY_DELETE); 193 194 String selection = ContactsContract.DeletedContacts.CONTACT_DELETED_TIMESTAMP + " > ?"; 195 String[] bindArgs = new String[]{mSearchTime + ""}; 196 return new CursorLoader(this, ContactsContract.DeletedContacts.CONTENT_URI, projection, 197 selection, bindArgs, ContactsContract.DeletedContacts.CONTACT_DELETED_TIMESTAMP + 198 " desc"); 199 } 200 201 @Override 202 public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor data) { 203 long timestamp = 0; 204 205 206 switch (cursorLoader.getId()) { 207 case ID_CHANGE_LOADER: 208 mDisplayView.setText(data.getCount() + " change(s) since " + mSearchTime); 209 mList.setAdapter(mChangeAdapter); 210 mChangeAdapter.swapCursor(data); 211 212 // Save the largest timestamp returned. Only need the first one due to the sort 213 // order. 214 if (data.moveToNext()) { 215 timestamp = data.getLong(data.getColumnIndex( 216 ContactsContract.Data.CONTACT_LAST_UPDATED_TIMESTAMP)); 217 data.moveToPrevious(); 218 } 219 if (timestamp > 0) { 220 saveLastTimestamp(timestamp, PREF_KEY_CHANGE); 221 mChangeButton.setText("Changed since " + timestamp); 222 } 223 break; 224 case ID_DELETE_LOADER: 225 mDisplayView.setText(data.getCount() + " delete(s) since " + mSearchTime); 226 mList.setAdapter(mDeleteAdapter); 227 mDeleteAdapter.swapCursor(new DeleteCursorWrapper(data)); 228 if (data.moveToNext()) { 229 timestamp = data.getLong(data.getColumnIndex( 230 ContactsContract.DeletedContacts.CONTACT_DELETED_TIMESTAMP)); 231 data.moveToPrevious(); 232 } 233 if (timestamp > 0) { 234 saveLastTimestamp(timestamp, PREF_KEY_DELETE); 235 mDeleteButton.setText("Deleted since " + timestamp); 236 } 237 break; 238 } 239 } 240 241 @Override 242 public void onLoaderReset(Loader<Cursor> cursorLoader) { 243 mDisplayView.setText(""); 244 switch (cursorLoader.getId()) { 245 case ID_CHANGE_LOADER: 246 mChangeAdapter.swapCursor(null); 247 break; 248 case ID_DELETE_LOADER: 249 mDeleteAdapter.swapCursor(null); 250 break; 251 } 252 } 253 254 private class DeleteCursorWrapper extends CursorWrapper { 255 256 /** 257 * Creates a cursor wrapper. 258 * 259 * @param cursor The underlying cursor to wrap. 260 */ 261 public DeleteCursorWrapper(Cursor cursor) { 262 super(cursor); 263 } 264 265 @Override 266 public int getColumnIndexOrThrow(String columnName) { 267 if (columnName.equals("_id")) { 268 return super.getColumnIndex(ContactsContract.DeletedContacts.CONTACT_ID); 269 } 270 return super.getColumnIndex(columnName); 271 } 272 } 273 274 private static class DeleteAdapter extends CursorAdapter { 275 276 private Context mContext; 277 278 public DeleteAdapter(Context context, Cursor c, int flags) { 279 super(context, c, flags); 280 this.mContext = context; 281 } 282 283 @Override 284 public View newView(Context context, Cursor cursor, ViewGroup parent) { 285 LinearLayout item = new LinearLayout(mContext); 286 item.addView(buildText(context)); 287 item.addView(buildText(context)); 288 return item; 289 } 290 291 @Override 292 public void bindView(View view, Context context, Cursor cursor) { 293 LinearLayout item = (LinearLayout) view; 294 String id = cursor.getString(cursor.getColumnIndex( 295 ContactsContract.DeletedContacts.CONTACT_ID)); 296 String timestamp = cursor.getString(cursor.getColumnIndex( 297 ContactsContract.DeletedContacts.CONTACT_DELETED_TIMESTAMP)); 298 299 setText(item.getChildAt(0), id); 300 setText(item.getChildAt(1), timestamp); 301 } 302 } 303 304 private static class ChangeAdapter extends CursorAdapter { 305 306 private Context mContext; 307 308 public ChangeAdapter(Context context, Cursor c, int flags) { 309 super(context, c, flags); 310 mContext = context; 311 } 312 313 @Override 314 public View newView(Context context, Cursor cursor, ViewGroup parent) { 315 LinearLayout item = new LinearLayout(mContext); 316 item.addView(buildText(context)); 317 item.addView(buildText(context)); 318 item.addView(buildText(context)); 319 return item; 320 } 321 322 @Override 323 public void bindView(View view, Context context, Cursor cursor) { 324 LinearLayout item = (LinearLayout) view; 325 326 String id = cursor.getString(cursor.getColumnIndex(ContactsContract.Data.CONTACT_ID)); 327 String name = cursor.getString(cursor.getColumnIndex( 328 ContactsContract.Data.DISPLAY_NAME)); 329 String timestamp = cursor.getString(cursor.getColumnIndex( 330 ContactsContract.Data.CONTACT_LAST_UPDATED_TIMESTAMP)); 331 332 setText(item.getChildAt(0), id); 333 setText(item.getChildAt(1), name); 334 setText(item.getChildAt(2), timestamp); 335 } 336 } 337 338 private static void setText(View view, String value) { 339 TextView text = (TextView) view; 340 text.setText(value); 341 } 342 343 private static TextView buildText(Context context) { 344 TextView view = new TextView(context); 345 view.setPadding(3, 3, 3, 3); 346 return view; 347 } 348 } 349
