Android Open Source - flash-your-qr Widget Configure

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License

The source code is released under:
Apache License
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Java Source Code

/*
 * Copyright 2011 Mattias Svala/*  w  w w .j  a  v a2 s  .c  om*/
 *
 * 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.github.qrgen;

import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import com.google.zxing.qrcode.encoder.Encoder;
import com.google.zxing.qrcode.encoder.QRCode;

import android.appwidget.AppWidgetManager;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.provider.ContactsContract.Contacts;
import android.util.Log;

public class WidgetConfigure extends PreferenceActivity {

    private static final String TAG = "qrgen";

    private static final String SOURCE = "qrSource";
    private static final String MANUAL = "qrManualData";
    private static final String CONTACT = "qrContactData";
    private static final String LABEL = "qrLabel";
    public static final String SOURCE_MANUAL = "sourceManual";
    public static final String SOURCE_CONTACT = "sourceContact";

    private int mWidgetId;
    private Preference manualData;
    private Preference contactData;

    private static String prefsName(int widgetId) {
        return "qrwidget_" + widgetId;
    }

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

        // Find the widget id from the intent. 
        Intent intent = getIntent();
        Bundle extras = intent.getExtras();
        int widgetId = 0;
        if (extras != null) {
            mWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID,
                                      AppWidgetManager.INVALID_APPWIDGET_ID);
        } else {
            Log.e(TAG, "We should have received extras here.");
            throw new RuntimeException("Missing data in configure activity.");
        }

        getPreferenceManager().setSharedPreferencesName(prefsName(mWidgetId));
        addPreferencesFromResource(R.xml.widget_configure);

        manualData = findPreference(MANUAL);
        manualData.setOnPreferenceChangeListener(setSummary);

        Preference label = findPreference(LABEL);
        label.setOnPreferenceChangeListener(setSummary);

        contactData = findPreference(CONTACT);
        contactData.setOnPreferenceClickListener(
                new Preference.OnPreferenceClickListener() {
                    public boolean onPreferenceClick (Preference preference) {
                        Intent intent = new Intent(Intent.ACTION_PICK, 
                               Contacts.CONTENT_URI);
                        startActivityForResult(intent, 0);
                        return true;
                    }
                });

        ListPreference source = (ListPreference)findPreference(SOURCE);
        updateSource(source.getValue());
        source.setOnPreferenceChangeListener(
                new Preference.OnPreferenceChangeListener() {
                    public boolean onPreferenceChange(Preference p, Object o) {
                        updateSource((String)o);
                        return true;
                    }
                });
    }

    private Preference.OnPreferenceChangeListener setSummary = 
            new Preference.OnPreferenceChangeListener() {
                public boolean onPreferenceChange(Preference p, Object o) {
                    p.setSummary((String)o);
                    return true;
                }
            };

    private void updateSource(String source) {
        if (source.equals(SOURCE_MANUAL)) {
            manualData.setEnabled(true);
            contactData.setEnabled(false);
        } else {
            manualData.setEnabled(false);
            contactData.setEnabled(true);
        }
    }

    private boolean validateContact(String lookupKey) {
        try {
            String data = Contact.getVCard(this, lookupKey);
            QRCode code = new QRCode();
            Encoder.encode(data, ErrorCorrectionLevel.L, code);
            return true;
        } catch (Exception e) {
            Log.e(TAG, "Failed to generate QR.", e);
            return false;
        }
    }

    @Override
    public void onActivityResult(int reqCode, int resultCode, Intent data) {
        super.onActivityResult(reqCode, resultCode, data);
        if (resultCode == RESULT_OK) {
            Uri contactUri = data.getData();
            Log.i(TAG, "uri: " + contactUri);
            String key = null;
            Cursor c =  managedQuery(contactUri, null, null, null, null);
            if (c.moveToFirst()) {
                key = c.getString(
                        c.getColumnIndexOrThrow(Contacts.LOOKUP_KEY));
                Log.i(TAG, "key: " + key);
            } else {
                Log.e(TAG, "No results from contact query");
                return;
            }

            if (validateContact(key)) {
                SharedPreferences.Editor prefs =
                        getPreferenceManager().getSharedPreferences().edit();
                prefs.putString("qrContactData", key);
                prefs.commit();
                String displayName = c.getString(
                        c.getColumnIndexOrThrow(Contacts.DISPLAY_NAME));
                Log.i(TAG, "display name: " + displayName);
                contactData.setSummary(displayName);
            } else {
                contactData.setSummary(getResources().
                        getString(R.string.conf_qr_failed));
            }
            try {
                Log.i(TAG, "vCard " + Contact.getVCard(this, key));
            } catch (Exception e) {
                Log.i(TAG, "Failed to get vCard.");
            }
        }
    }

    @Override
    public void onBackPressed() {
        Context context = this;

        QrData qrData = loadConf(context, mWidgetId);

        if (qrData.data == null) {
            Log.i(TAG, "No data provided for QR code.");
            setResult(RESULT_CANCELED);
            super.onBackPressed();
            return;
        }

        AppWidgetManager appWidgetManager = 
                AppWidgetManager.getInstance(context);
        QrAppWidgetProvider.updateAppWidget(context, appWidgetManager,
                                            mWidgetId, qrData);
        // Make sure we pass back the original appWidgetId
        Intent resultValue = new Intent();
        resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mWidgetId);
        setResult(RESULT_OK, resultValue);

        super.onBackPressed();
    }

    static QrData loadConf(Context context, int widgetId) {
        SharedPreferences prefs = 
                context.getSharedPreferences(prefsName(widgetId), 0);
        String source = prefs.getString(SOURCE, null);
        String data;
        if (SOURCE_MANUAL.equals(source)) {
            data = prefs.getString(MANUAL, null);
        } else {
            data = prefs.getString(CONTACT, null);
        }

        return new QrData(source, data, prefs.getString(LABEL, ""));
    }

}
Java Source Code List
