samples/ApiDemos/src/com/example/android/apis/content/ChangedContacts.java - platform/development - Git at Google

 /*
  * Copyright (C) 2013 The Android Open Source Project
  *
  * 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.example.android.apis.content;

 import android.app.Activity;
 import android.app.LoaderManager;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.CursorLoader;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.Loader;
 import android.content.SharedPreferences;
 import android.database.Cursor;
 import android.database.CursorWrapper;
 import android.os.Bundle;
 import android.provider.ContactsContract;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
 import android.widget.CursorAdapter;
 import android.widget.LinearLayout;
 import android.widget.ListView;
 import android.widget.TextView;
 import android.widget.Toast;

 /**
  * Demonstrates selecting contacts that have changed since a certain time.
  */
 public class ChangedContacts extends Activity implements LoaderManager.LoaderCallbacks<Cursor> {

     private static final String CLASS = ChangedContacts.class.getSimpleName();

     private static final String PREF_KEY_CHANGE = "timestamp_change";
     private static final String PREF_KEY_DELETE = "timestamp_delete";

     private static final int ID_CHANGE_LOADER = 1;
     private static final int ID_DELETE_LOADER = 2;

     /**
      * To see this in action, "clear data" for the contacts storage app in the system settings.
      * Then come into this app and hit any of the delta buttons.  This will cause the contacts
      * database to be re-created.
      */
     private BroadcastReceiver mReceiver = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
             Toast toast = Toast.makeText(context, "Contacts database created.", Toast.LENGTH_SHORT);
             toast.show();
         }
     };

     private DeleteAdapter mDeleteAdapter;
     private ChangeAdapter mChangeAdapter;
     private long mSearchTime;
     private TextView mDisplayView;
     private ListView mList;
     private Button mDeleteButton;
     private Button mChangeButton;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         mDeleteAdapter = new DeleteAdapter(this, null, 0);
         mChangeAdapter = new ChangeAdapter(this, null, 0);

         LinearLayout main = new LinearLayout(this);
         main.setOrientation(LinearLayout.VERTICAL);

         mChangeButton = new Button(this);
         mChangeButton.setText("Changed since " + getLastTimestamp(0, PREF_KEY_CHANGE));
         mChangeButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 changeClick();
             }
         });

         mDeleteButton = new Button(this);
         mDeleteButton.setText("Deleted since " + getLastTimestamp(0, PREF_KEY_DELETE));
         mDeleteButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 deleteClick();
             }
         });

         main.addView(mChangeButton);
         main.addView(mDeleteButton);

         mDisplayView = new TextView(this);
         mDisplayView.setPadding(5, 5, 5, 5);
         main.addView(mDisplayView);

         mList = new ListView(this);
         mList.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
                 ViewGroup.LayoutParams.WRAP_CONTENT, 1f));
         main.addView(mList);

         setContentView(main);
     }

     @Override
     protected void onResume() {
         super.onResume();
         IntentFilter filter = new IntentFilter();
         filter.addAction(ContactsContract.Intents.CONTACTS_DATABASE_CREATED);
         registerReceiver(mReceiver, filter);
     }

     @Override
     protected void onPause() {
         super.onPause();
         unregisterReceiver(mReceiver);
     }

     private void changeClick() {
         mChangeAdapter.swapCursor(null);
         LoaderManager manager = getLoaderManager();
         manager.destroyLoader(ID_DELETE_LOADER);
         manager.restartLoader(ID_CHANGE_LOADER, null, this);
     }

     private void deleteClick() {
         mChangeAdapter.swapCursor(null);
         LoaderManager manager = getLoaderManager();
         manager.destroyLoader(ID_CHANGE_LOADER);
         manager.restartLoader(ID_DELETE_LOADER, null, this);
     }

     private void saveLastTimestamp(long time, String key) {
         SharedPreferences pref = getSharedPreferences(CLASS, Context.MODE_PRIVATE);
         SharedPreferences.Editor editor = pref.edit();
         editor.putLong(key, time);
         editor.commit();
     }

     private long getLastTimestamp(long time, String key) {
         SharedPreferences pref = getSharedPreferences(CLASS, Context.MODE_PRIVATE);
         return pref.getLong(key, time);
     }

     @Override
     public Loader<Cursor> onCreateLoader(int id, Bundle args) {
         switch(id) {
             case ID_CHANGE_LOADER:
                 return getChangeLoader();
             case ID_DELETE_LOADER:
                 return getDeleteLoader();
         }
         return null;
     }

     private CursorLoader getChangeLoader() {
         String[] projection = new String[]{
                 ContactsContract.Data._ID,
                 ContactsContract.Data.CONTACT_ID,
                 ContactsContract.Data.DISPLAY_NAME,
                 ContactsContract.Data.CONTACT_LAST_UPDATED_TIMESTAMP
         };

         mSearchTime = getLastTimestamp(0, PREF_KEY_CHANGE);

         String selection = ContactsContract.Data.CONTACT_LAST_UPDATED_TIMESTAMP + " > ?";
         String[] bindArgs = new String[]{mSearchTime + ""};
         return new CursorLoader(this, ContactsContract.Data.CONTENT_URI, projection,
                 selection, bindArgs, ContactsContract.Data.CONTACT_LAST_UPDATED_TIMESTAMP
                 + " desc, " + ContactsContract.Data.CONTACT_ID + " desc");
     }

     private CursorLoader getDeleteLoader() {
         String[] projection = new String[]{
                 ContactsContract.DeletedContacts.CONTACT_ID,
                 ContactsContract.DeletedContacts.CONTACT_DELETED_TIMESTAMP
         };

         mSearchTime = getLastTimestamp(0, PREF_KEY_DELETE);

         String selection = ContactsContract.DeletedContacts.CONTACT_DELETED_TIMESTAMP + " > ?";
         String[] bindArgs = new String[]{mSearchTime + ""};
         return new CursorLoader(this, ContactsContract.DeletedContacts.CONTENT_URI, projection,
                 selection, bindArgs, ContactsContract.DeletedContacts.CONTACT_DELETED_TIMESTAMP +
                 " desc");
     }

     @Override
     public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor data) {
         long timestamp = 0;


         switch (cursorLoader.getId()) {
             case ID_CHANGE_LOADER:
                 mDisplayView.setText(data.getCount() + " change(s) since " + mSearchTime);
                 mList.setAdapter(mChangeAdapter);
                 mChangeAdapter.swapCursor(data);

                 // Save the largest timestamp returned.  Only need the first one due to the sort
                 // order.
                 if (data.moveToNext()) {
                     timestamp = data.getLong(data.getColumnIndex(
                             ContactsContract.Data.CONTACT_LAST_UPDATED_TIMESTAMP));
                     data.moveToPrevious();
                 }
                 if (timestamp > 0) {
                     saveLastTimestamp(timestamp, PREF_KEY_CHANGE);
                     mChangeButton.setText("Changed since " + timestamp);
                 }
                 break;
             case ID_DELETE_LOADER:
                 mDisplayView.setText(data.getCount() + " delete(s) since " + mSearchTime);
                 mList.setAdapter(mDeleteAdapter);
                 mDeleteAdapter.swapCursor(new DeleteCursorWrapper(data));
                 if (data.moveToNext()) {
                     timestamp = data.getLong(data.getColumnIndex(
                             ContactsContract.DeletedContacts.CONTACT_DELETED_TIMESTAMP));
                     data.moveToPrevious();
                 }
                 if (timestamp > 0) {
                     saveLastTimestamp(timestamp, PREF_KEY_DELETE);
                     mDeleteButton.setText("Deleted since " + timestamp);
                 }
                 break;
         }
     }

     @Override
     public void onLoaderReset(Loader<Cursor> cursorLoader) {
         mDisplayView.setText("");
         switch (cursorLoader.getId()) {
             case ID_CHANGE_LOADER:
                 mChangeAdapter.swapCursor(null);
                 break;
             case ID_DELETE_LOADER:
                 mDeleteAdapter.swapCursor(null);
                 break;
         }
     }

     private class DeleteCursorWrapper extends CursorWrapper {

         /**
          * Creates a cursor wrapper.
          *
          * @param cursor The underlying cursor to wrap.
          */
         public DeleteCursorWrapper(Cursor cursor) {
             super(cursor);
         }

         @Override
         public int getColumnIndexOrThrow(String columnName) {
             if (columnName.equals("_id")) {
                 return super.getColumnIndex(ContactsContract.DeletedContacts.CONTACT_ID);
             }
             return super.getColumnIndex(columnName);
         }
     }

     private static class DeleteAdapter extends CursorAdapter {

         private Context mContext;

         public DeleteAdapter(Context context, Cursor c, int flags) {
             super(context, c, flags);
             this.mContext = context;
         }

         @Override
         public View newView(Context context, Cursor cursor, ViewGroup parent) {
             LinearLayout item = new LinearLayout(mContext);
             item.addView(buildText(context));
             item.addView(buildText(context));
             return item;
         }

         @Override
         public void bindView(View view, Context context, Cursor cursor) {
             LinearLayout item = (LinearLayout) view;
             String id = cursor.getString(cursor.getColumnIndex(
                     ContactsContract.DeletedContacts.CONTACT_ID));
             String timestamp = cursor.getString(cursor.getColumnIndex(
                     ContactsContract.DeletedContacts.CONTACT_DELETED_TIMESTAMP));

             setText(item.getChildAt(0), id);
             setText(item.getChildAt(1), timestamp);
         }
     }

     private static class ChangeAdapter extends CursorAdapter {

         private Context mContext;

         public ChangeAdapter(Context context, Cursor c, int flags) {
             super(context, c, flags);
             mContext = context;
         }

         @Override
         public View newView(Context context, Cursor cursor, ViewGroup parent) {
             LinearLayout item = new LinearLayout(mContext);
             item.addView(buildText(context));
             item.addView(buildText(context));
             item.addView(buildText(context));
             return item;
         }

         @Override
         public void bindView(View view, Context context, Cursor cursor) {
             LinearLayout item = (LinearLayout) view;

             String id = cursor.getString(cursor.getColumnIndex(ContactsContract.Data.CONTACT_ID));
             String name = cursor.getString(cursor.getColumnIndex(
                     ContactsContract.Data.DISPLAY_NAME));
             String timestamp = cursor.getString(cursor.getColumnIndex(
                     ContactsContract.Data.CONTACT_LAST_UPDATED_TIMESTAMP));

             setText(item.getChildAt(0), id);
             setText(item.getChildAt(1), name);
             setText(item.getChildAt(2), timestamp);
         }
     }

     private static void setText(View view, String value) {
         TextView text = (TextView) view;
         text.setText(value);
     }

     private static TextView buildText(Context context) {
         TextView view = new TextView(context);
         view.setPadding(3, 3, 3, 3);
         return view;
     }
 }
	/*
	* Copyright (C) 2013 The Android Open Source Project
	*
	* 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.example.android.apis.content;

	import android.app.Activity;
	import android.app.LoaderManager;
	import android.content.BroadcastReceiver;
	import android.content.Context;
	import android.content.CursorLoader;
	import android.content.Intent;
	import android.content.IntentFilter;
	import android.content.Loader;
	import android.content.SharedPreferences;
	import android.database.Cursor;
	import android.database.CursorWrapper;
	import android.os.Bundle;
	import android.provider.ContactsContract;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.Button;
	import android.widget.CursorAdapter;
	import android.widget.LinearLayout;
	import android.widget.ListView;
	import android.widget.TextView;
	import android.widget.Toast;

	/**
	* Demonstrates selecting contacts that have changed since a certain time.
	*/
	public class ChangedContacts extends Activity implements LoaderManager.LoaderCallbacks<Cursor> {

	private static final String CLASS = ChangedContacts.class.getSimpleName();

	private static final String PREF_KEY_CHANGE = "timestamp_change";
	private static final String PREF_KEY_DELETE = "timestamp_delete";

	private static final int ID_CHANGE_LOADER = 1;
	private static final int ID_DELETE_LOADER = 2;

	/**
	* To see this in action, "clear data" for the contacts storage app in the system settings.
	* Then come into this app and hit any of the delta buttons. This will cause the contacts
	* database to be re-created.
	*/
	private BroadcastReceiver mReceiver = new BroadcastReceiver() {
	@Override
	public void onReceive(Context context, Intent intent) {
	Toast toast = Toast.makeText(context, "Contacts database created.", Toast.LENGTH_SHORT);
	toast.show();
	}
	};

	private DeleteAdapter mDeleteAdapter;
	private ChangeAdapter mChangeAdapter;
	private long mSearchTime;
	private TextView mDisplayView;
	private ListView mList;
	private Button mDeleteButton;
	private Button mChangeButton;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);

	mDeleteAdapter = new DeleteAdapter(this, null, 0);
	mChangeAdapter = new ChangeAdapter(this, null, 0);

	LinearLayout main = new LinearLayout(this);
	main.setOrientation(LinearLayout.VERTICAL);

	mChangeButton = new Button(this);
	mChangeButton.setText("Changed since " + getLastTimestamp(0, PREF_KEY_CHANGE));
	mChangeButton.setOnClickListener(new View.OnClickListener() {
	@Override
	public void onClick(View v) {
	changeClick();
	}
	});

	mDeleteButton = new Button(this);
	mDeleteButton.setText("Deleted since " + getLastTimestamp(0, PREF_KEY_DELETE));
	mDeleteButton.setOnClickListener(new View.OnClickListener() {
	@Override
	public void onClick(View v) {
	deleteClick();
	}
	});

	main.addView(mChangeButton);
	main.addView(mDeleteButton);

	mDisplayView = new TextView(this);
	mDisplayView.setPadding(5, 5, 5, 5);
	main.addView(mDisplayView);

	mList = new ListView(this);
	mList.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
	ViewGroup.LayoutParams.WRAP_CONTENT, 1f));
	main.addView(mList);

	setContentView(main);
	}

	@Override
	protected void onResume() {
	super.onResume();
	IntentFilter filter = new IntentFilter();
	filter.addAction(ContactsContract.Intents.CONTACTS_DATABASE_CREATED);
	registerReceiver(mReceiver, filter);
	}

	@Override
	protected void onPause() {
	super.onPause();
	unregisterReceiver(mReceiver);
	}

	private void changeClick() {
	mChangeAdapter.swapCursor(null);
	LoaderManager manager = getLoaderManager();
	manager.destroyLoader(ID_DELETE_LOADER);
	manager.restartLoader(ID_CHANGE_LOADER, null, this);
	}

	private void deleteClick() {
	mChangeAdapter.swapCursor(null);
	LoaderManager manager = getLoaderManager();
	manager.destroyLoader(ID_CHANGE_LOADER);
	manager.restartLoader(ID_DELETE_LOADER, null, this);
	}

	private void saveLastTimestamp(long time, String key) {
	SharedPreferences pref = getSharedPreferences(CLASS, Context.MODE_PRIVATE);
	SharedPreferences.Editor editor = pref.edit();
	editor.putLong(key, time);
	editor.commit();
	}

	private long getLastTimestamp(long time, String key) {
	SharedPreferences pref = getSharedPreferences(CLASS, Context.MODE_PRIVATE);
	return pref.getLong(key, time);
	}

	@Override
	public Loader<Cursor> onCreateLoader(int id, Bundle args) {
	switch(id) {
	case ID_CHANGE_LOADER:
	return getChangeLoader();
	case ID_DELETE_LOADER:
	return getDeleteLoader();
	}
	return null;
	}

	private CursorLoader getChangeLoader() {
	String[] projection = new String[]{
	ContactsContract.Data._ID,
	ContactsContract.Data.CONTACT_ID,
	ContactsContract.Data.DISPLAY_NAME,
	ContactsContract.Data.CONTACT_LAST_UPDATED_TIMESTAMP
	};

	mSearchTime = getLastTimestamp(0, PREF_KEY_CHANGE);

	String selection = ContactsContract.Data.CONTACT_LAST_UPDATED_TIMESTAMP + " > ?";
	String[] bindArgs = new String[]{mSearchTime + ""};
	return new CursorLoader(this, ContactsContract.Data.CONTENT_URI, projection,
	selection, bindArgs, ContactsContract.Data.CONTACT_LAST_UPDATED_TIMESTAMP
	+ " desc, " + ContactsContract.Data.CONTACT_ID + " desc");
	}

	private CursorLoader getDeleteLoader() {
	String[] projection = new String[]{
	ContactsContract.DeletedContacts.CONTACT_ID,
	ContactsContract.DeletedContacts.CONTACT_DELETED_TIMESTAMP
	};

	mSearchTime = getLastTimestamp(0, PREF_KEY_DELETE);

	String selection = ContactsContract.DeletedContacts.CONTACT_DELETED_TIMESTAMP + " > ?";
	String[] bindArgs = new String[]{mSearchTime + ""};
	return new CursorLoader(this, ContactsContract.DeletedContacts.CONTENT_URI, projection,
	selection, bindArgs, ContactsContract.DeletedContacts.CONTACT_DELETED_TIMESTAMP +
	" desc");
	}

	@Override
	public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor data) {
	long timestamp = 0;


	switch (cursorLoader.getId()) {
	case ID_CHANGE_LOADER:
	mDisplayView.setText(data.getCount() + " change(s) since " + mSearchTime);
	mList.setAdapter(mChangeAdapter);
	mChangeAdapter.swapCursor(data);

	// Save the largest timestamp returned. Only need the first one due to the sort
	// order.
	if (data.moveToNext()) {
	timestamp = data.getLong(data.getColumnIndex(
	ContactsContract.Data.CONTACT_LAST_UPDATED_TIMESTAMP));
	data.moveToPrevious();
	}
	if (timestamp > 0) {
	saveLastTimestamp(timestamp, PREF_KEY_CHANGE);
	mChangeButton.setText("Changed since " + timestamp);
	}
	break;
	case ID_DELETE_LOADER:
	mDisplayView.setText(data.getCount() + " delete(s) since " + mSearchTime);
	mList.setAdapter(mDeleteAdapter);
	mDeleteAdapter.swapCursor(new DeleteCursorWrapper(data));
	if (data.moveToNext()) {
	timestamp = data.getLong(data.getColumnIndex(
	ContactsContract.DeletedContacts.CONTACT_DELETED_TIMESTAMP));
	data.moveToPrevious();
	}
	if (timestamp > 0) {
	saveLastTimestamp(timestamp, PREF_KEY_DELETE);
	mDeleteButton.setText("Deleted since " + timestamp);
	}
	break;
	}
	}

	@Override
	public void onLoaderReset(Loader<Cursor> cursorLoader) {
	mDisplayView.setText("");
	switch (cursorLoader.getId()) {
	case ID_CHANGE_LOADER:
	mChangeAdapter.swapCursor(null);
	break;
	case ID_DELETE_LOADER:
	mDeleteAdapter.swapCursor(null);
	break;
	}
	}

	private class DeleteCursorWrapper extends CursorWrapper {

	/**
	* Creates a cursor wrapper.
	*
	* @param cursor The underlying cursor to wrap.
	*/
	public DeleteCursorWrapper(Cursor cursor) {
	super(cursor);
	}

	@Override
	public int getColumnIndexOrThrow(String columnName) {
	if (columnName.equals("_id")) {
	return super.getColumnIndex(ContactsContract.DeletedContacts.CONTACT_ID);
	}
	return super.getColumnIndex(columnName);
	}
	}

	private static class DeleteAdapter extends CursorAdapter {

	private Context mContext;

	public DeleteAdapter(Context context, Cursor c, int flags) {
	super(context, c, flags);
	this.mContext = context;
	}

	@Override
	public View newView(Context context, Cursor cursor, ViewGroup parent) {
	LinearLayout item = new LinearLayout(mContext);
	item.addView(buildText(context));
	item.addView(buildText(context));
	return item;
	}

	@Override
	public void bindView(View view, Context context, Cursor cursor) {
	LinearLayout item = (LinearLayout) view;
	String id = cursor.getString(cursor.getColumnIndex(
	ContactsContract.DeletedContacts.CONTACT_ID));
	String timestamp = cursor.getString(cursor.getColumnIndex(
	ContactsContract.DeletedContacts.CONTACT_DELETED_TIMESTAMP));

	setText(item.getChildAt(0), id);
	setText(item.getChildAt(1), timestamp);
	}
	}

	private static class ChangeAdapter extends CursorAdapter {

	private Context mContext;

	public ChangeAdapter(Context context, Cursor c, int flags) {
	super(context, c, flags);
	mContext = context;
	}

	@Override
	public View newView(Context context, Cursor cursor, ViewGroup parent) {
	LinearLayout item = new LinearLayout(mContext);
	item.addView(buildText(context));
	item.addView(buildText(context));
	item.addView(buildText(context));
	return item;
	}

	@Override
	public void bindView(View view, Context context, Cursor cursor) {
	LinearLayout item = (LinearLayout) view;

	String id = cursor.getString(cursor.getColumnIndex(ContactsContract.Data.CONTACT_ID));
	String name = cursor.getString(cursor.getColumnIndex(
	ContactsContract.Data.DISPLAY_NAME));
	String timestamp = cursor.getString(cursor.getColumnIndex(
	ContactsContract.Data.CONTACT_LAST_UPDATED_TIMESTAMP));

	setText(item.getChildAt(0), id);
	setText(item.getChildAt(1), name);
	setText(item.getChildAt(2), timestamp);
	}
	}

	private static void setText(View view, String value) {
	TextView text = (TextView) view;
	text.setText(value);
	}

	private static TextView buildText(Context context) {
	TextView view = new TextView(context);
	view.setPadding(3, 3, 3, 3);
	return view;
	}
	}