Android Open Source - BBC-News-Reader Eula

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License

The source code is released under:

Copyright (c) 2011, 2012, Digital Lizard (Oscar Key, Thomas Boby) All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the...

Java Source Code

/*
 * Copyright (C) 2008 The Android Open Source Project
 *//  ww  w .  j av a  2  s. co  m
 * 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.digitallizard.bbcnewsreader;

import java.io.BufferedReader;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStreamReader;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences;

/**
 * Displays an EULA ("End User License Agreement") that the user has to accept before using the application. Your application should call
 * {@link Eula#show(android.app.Activity)} in the onCreate() method of the first activity. If the user accepts the EULA, it will never be shown again.
 * If the user refuses, {@link android.app.Activity#finish()} is invoked on your activity.
 */
class Eula {
  private static final String ASSET_EULA = "EULA";
  private static final String PREFERENCE_EULA_ACCEPTED = "eula.accepted";
  private static final String PREFERENCES_EULA = "eula";
  
  /**
   * callback to let the activity know when the user has accepted the EULA.
   */
  static interface OnEulaAgreedTo {
    
    /**
     * Called when the user has accepted the eula and the dialog closes.
     */
    void onEulaAgreedTo();
  }
  
  /**
   * Displays the EULA if necessary. This method should be called from the onCreate() method of your main Activity.
   * 
   * @param activity
   *            The Activity to finish if the user rejects the EULA.
   * @return Whether the user has agreed already.
   */
  static boolean show(final Activity activity) {
    final SharedPreferences preferences = activity.getSharedPreferences(PREFERENCES_EULA, Context.MODE_PRIVATE);
    if (!preferences.getBoolean(PREFERENCE_EULA_ACCEPTED, false)) {
      final AlertDialog.Builder builder = new AlertDialog.Builder(activity);
      builder.setTitle(R.string.eula_title);
      builder.setCancelable(true);
      builder.setPositiveButton(R.string.eula_accept, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
          accept(preferences);
          if (activity instanceof OnEulaAgreedTo) {
            ((OnEulaAgreedTo) activity).onEulaAgreedTo();
          }
        }
      });
      builder.setNegativeButton(R.string.eula_refuse, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
          refuse(activity);
        }
      });
      builder.setOnCancelListener(new DialogInterface.OnCancelListener() {
        public void onCancel(DialogInterface dialog) {
          refuse(activity);
        }
      });
      builder.setMessage(readEula(activity));
      builder.create().show();
      return false;
    }
    return true;
  }
  
  private static void accept(SharedPreferences preferences) {
    preferences.edit().putBoolean(PREFERENCE_EULA_ACCEPTED, true).commit();
  }
  
  private static void refuse(Activity activity) {
    activity.finish();
  }
  
  private static CharSequence readEula(Activity activity) {
    BufferedReader in = null;
    try {
      in = new BufferedReader(new InputStreamReader(activity.getAssets().open(ASSET_EULA)));
      String line;
      StringBuilder buffer = new StringBuilder();
      while ((line = in.readLine()) != null) {
        buffer.append(line).append('\n');
      }
      return buffer;
    } catch (IOException e) {
      return "";
    } finally {
      closeStream(in);
    }
  }
  
  /**
   * Closes the specified stream.
   * 
   * @param stream
   *            The stream to close.
   */
  private static void closeStream(Closeable stream) {
    if (stream != null) {
      try {
        stream.close();
      } catch (IOException e) {
        // Ignore
      }
    }
  }
}

Java Source Code List

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