ContactablesLoaderCallbacks.java

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/*
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 * Copyright (C) 2012 The Android Open Source Project
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.example.android.basiccontactables;
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import android.app.Activity;
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import android.app.LoaderManager;
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import android.content.Context;
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import android.content.CursorLoader;
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import android.content.Loader;
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import android.database.Cursor;
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import android.net.Uri;
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import android.os.Bundle;
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import android.provider.ContactsContract.CommonDataKinds;
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import android.util.Log;
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import android.widget.TextView;
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/**
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 * Helper class to handle all the callbacks that occur when interacting with loaders.  Most of the
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 * interesting code in this sample app will be in this file.
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 */
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public class ContactablesLoaderCallbacks implements LoaderManager.LoaderCallbacks<Cursor> {
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    Context mContext;
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    public static final String QUERY_KEY = "query";
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    public static final String TAG = "ContactablesLoaderCallbacks";
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    public ContactablesLoaderCallbacks(Context context) {
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        mContext = context;
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    }
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    @Override
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    public Loader<Cursor> onCreateLoader(int loaderIndex, Bundle args) {
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        // Where the Contactables table excels is matching text queries,
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        // not just data dumps from Contacts db.  One search term is used to query
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        // display name, email address and phone number.  In this case, the query was extracted
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        // from an incoming intent in the handleIntent() method, via the
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        // intent.getStringExtra() method.
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        String query = args.getString(QUERY_KEY);
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        Uri uri = Uri.withAppendedPath(
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                CommonDataKinds.Contactables.CONTENT_FILTER_URI, query);
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        // Easy way to limit the query to contacts with phone numbers.
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        String selection =
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                CommonDataKinds.Contactables.HAS_PHONE_NUMBER + " = " + 1;
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        // Sort results such that rows for the same contact stay together.
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        String sortBy = CommonDataKinds.Contactables.LOOKUP_KEY;
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        return new CursorLoader(
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                mContext,  // Context
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                uri,       // URI representing the table/resource to be queried
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                null,      // projection - the list of columns to return.  Null means "all"
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                selection, // selection - Which rows to return (condition rows must match)
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                null,      // selection args - can be provided separately and subbed into selection.
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                sortBy);   // string specifying sort order
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    }
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    @Override
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    public void onLoadFinished(Loader<Cursor> arg0, Cursor cursor) {
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        TextView tv  = (TextView) ((Activity)mContext).findViewById(R.id.sample_output);
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        if(tv == null) {
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            Log.e(TAG, "TextView is null?!");
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        } else if (mContext == null) {
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            Log.e(TAG, "Context is null?");
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        } else {
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            Log.e(TAG, "Nothing is null?!");
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        }
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        // Reset text in case of a previous query
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        tv.setText(mContext.getText(R.string.intro_message) + "\n\n");
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        if (cursor.getCount() == 0) {
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            return;
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        }
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        // Pulling the relevant value from the cursor requires knowing the column index to pull
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        // it from.
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        int phoneColumnIndex = cursor.getColumnIndex(CommonDataKinds.Phone.NUMBER);
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        int emailColumnIndex = cursor.getColumnIndex(CommonDataKinds.Email.ADDRESS);
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        int nameColumnIndex = cursor.getColumnIndex(CommonDataKinds.Contactables.DISPLAY_NAME);
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        int lookupColumnIndex = cursor.getColumnIndex(CommonDataKinds.Contactables.LOOKUP_KEY);
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        int typeColumnIndex = cursor.getColumnIndex(CommonDataKinds.Contactables.MIMETYPE);
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        cursor.moveToFirst();
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        // Lookup key is the easiest way to verify a row of data is for the same
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        // contact as the previous row.
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        String lookupKey = "";
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        do {
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            String currentLookupKey = cursor.getString(lookupColumnIndex);
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            if (!lookupKey.equals(currentLookupKey)) {
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                String displayName = cursor.getString(nameColumnIndex);
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                tv.append(displayName + "\n");
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                lookupKey = currentLookupKey;
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            }
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            // The data type can be determined using the mime type column.
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            String mimeType = cursor.getString(typeColumnIndex);
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            if (mimeType.equals(CommonDataKinds.Phone.CONTENT_ITEM_TYPE)) {
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                tv.append("\tPhone Number: " + cursor.getString(phoneColumnIndex) + "\n");
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            } else if (mimeType.equals(CommonDataKinds.Email.CONTENT_ITEM_TYPE)) {
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                tv.append("\tEmail Address: " + cursor.getString(emailColumnIndex) + "\n");
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            }
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            // Look at DDMS to see all the columns returned by a query to Contactables.
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            // Behold, the firehose!
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            for(String column : cursor.getColumnNames()) {
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                Log.d(TAG, column + column + ": " +
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                        cursor.getString(cursor.getColumnIndex(column)) + "\n");
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            }
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        } while (cursor.moveToNext());
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    }
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    @Override
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    public void onLoaderReset(Loader<Cursor> cursorLoader) {
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    }
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}