Android Open Source - my-wallpaper Eula

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License

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

/*
 * Copyright (C) 2008 The Android Open Source Project
 */* ww  w  . j  ava2 s  .  c o  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.koonen.photostream;

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

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

/**
 * Displays an EULA ("End User License Agreement") that the user has to accept
 * before using the application. Your application should call
 * {@link Eula#showEula(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 PREFERENCE_EULA_ACCEPTED = "eula.accepted";
  private static final String PREFERENCES_EULA = "eula";

  /**
   * 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.
   */
  static void showEula(final Activity activity, final Runnable runable) {
    final SharedPreferences preferences = activity.getSharedPreferences(
        PREFERENCES_EULA, Activity.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);
              runable.run();
            }
          });
      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);
        }
      });
      // UNCOMMENT TO ENABLE EULA
      builder.setMessage(readFile(activity, R.raw.eula));
      builder.create().show();
    } else {
      runable.run();
    }
  }

  private static void accept(SharedPreferences preferences) {
    preferences.edit().putBoolean(PREFERENCE_EULA_ACCEPTED, true).commit();
  }

  private static void refuse(Activity activity) {
    activity.finish();
  }

  static void showDisclaimer(Activity activity) {
    final AlertDialog.Builder builder = new AlertDialog.Builder(activity);
    builder.setMessage(readFile(activity, R.raw.disclaimer));
    builder.setCancelable(true);
    builder.setTitle(R.string.disclaimer_title);
    builder.setPositiveButton(R.string.disclaimer_accept, null);
    builder.create().show();
  }

  private static CharSequence readFile(Activity activity, int id) {
    BufferedReader in = null;
    try {
      in = new BufferedReader(new InputStreamReader(activity
          .getResources().openRawResource(id)));
      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
      }
    }
  }
}
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