AndroidModule.java

/*
 * Copyright (C) 2014 Andrew Reitz
 *
 * 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.andrewreitz.encryptedcamera.di.module;

import android.app.ActivityManager;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.provider.MediaStore;
import android.support.v4.app.NotificationCompat;
import android.support.v4.util.LruCache;

import com.andrewreitz.encryptedcamera.EncryptedCameraApp;
import com.andrewreitz.encryptedcamera.R;
import com.andrewreitz.encryptedcamera.cache.ThumbnailCache;
import com.andrewreitz.encryptedcamera.di.annotation.CameraIntent;
import com.andrewreitz.encryptedcamera.di.annotation.EncryptionErrorNotification;
import com.andrewreitz.encryptedcamera.di.annotation.EncryptionNotification;
import com.andrewreitz.encryptedcamera.di.annotation.ForApplication;
import com.andrewreitz.encryptedcamera.di.annotation.MediaFormat;
import com.andrewreitz.encryptedcamera.di.annotation.UnlockNotification;
import com.andrewreitz.encryptedcamera.service.EncryptionIntentService;
import com.andrewreitz.encryptedcamera.ui.activity.SettingsActivity;
import com.squareup.otto.Bus;

import java.security.SecureRandom;
import java.text.DateFormat;
import java.text.SimpleDateFormat;

import javax.inject.Singleton;

import dagger.Module;
import dagger.Provides;

import static com.google.common.base.Preconditions.checkNotNull;

@SuppressWarnings("UnusedDeclaration") @Module(
    library = true,
    includes = {
        SharedPrefsModule.class, EncryptionModule.class, FileSystemModule.class
    },
    injects = {
        EncryptedCameraApp.class, EncryptionIntentService.class
    })
public class AndroidModule {

  private final EncryptedCameraApp application;

  public AndroidModule(EncryptedCameraApp application) {
    this.application = checkNotNull(application);
  }

  /**
   * Allow the application context to be injected but require that it be annotated with
   * {@link com.andrewreitz.encryptedcamera.di.annotation.ForApplication
   *
   * @ForApplication} to explicitly differentiate it from an activity context.
   */
  @Provides @Singleton @ForApplication Context provideApplicationContext() {
    return application;
  }

  @Provides @Singleton NotificationManager provideNotificationManager() {
    return (NotificationManager) application.getSystemService(Context.NOTIFICATION_SERVICE);
  }

  @Provides @Singleton @EncryptionNotification Notification provideEncryptionNotification() {
    return new NotificationCompat.Builder(application).setProgress(0, 0, true) //
        .setContentTitle(application.getString(R.string.app_name)) //
        .setContentText(application.getString(R.string.encrypting_your_photos)) //
        .setSmallIcon(R.drawable.ic_unlocked) //TODO New Icon
        .build();
  }

  @Provides @Singleton @EncryptionErrorNotification
  Notification provideEncryptionErrorNotification() {
    Notification notification = new NotificationCompat.Builder(application) //
        .setContentTitle(application.getString(R.string.error_encrypting)) //
        .setContentText(application.getString(R.string.error_encrypting_photo)) //
        .setSmallIcon(R.drawable.ic_unlocked) //TODO New Icon
        .setAutoCancel(true) //
        .build();

    notification.flags |= Notification.FLAG_NO_CLEAR;

    return notification;
  }

  @Provides @Singleton @UnlockNotification Notification provideUnlockNotification() {
    Notification notification = new NotificationCompat.Builder(application) //
        .setContentTitle(application.getString(R.string.app_name)) //
        .setContentText(application.getString(R.string.images_unencryped_message)) //
        .setContentIntent(PendingIntent.getActivity(application, 0,
            new Intent(application, SettingsActivity.class), 0)) //
        .setSmallIcon(R.drawable.ic_unlocked) //
        .build();

    notification.flags |= Notification.FLAG_NO_CLEAR;

    return notification;
  }

  @Provides @Singleton SecureRandom provideSecureRandom() {
    return new SecureRandom();
  }

  @Provides @Singleton @MediaFormat DateFormat provideMediaDateFormat() {
    return new SimpleDateFormat(EncryptedCameraApp.MEDIA_OUTPUT_DATE_FORMAT);
  }

  @Provides @CameraIntent Intent provideCameraIntent() {
    return new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
  }

  @Provides @Singleton Bus provideBus() {
    return new Bus();
  }

  @Provides @Singleton ActivityManager provideActivityManager() {
    return (ActivityManager) application.getSystemService(Context.ACTIVITY_SERVICE);
  }

  @Provides @Singleton LruCache<String, Bitmap> provideCache(ActivityManager am) {
    // Keep the cache as a singleton so as along as the application is running we are
    // using the cache hopefully keeping the speed of the application up
    // Also allows us to hook into the application class easily to handle onLowMemory events

    int memoryClassBytes = am.getMemoryClass() * 1024 * 1024;
    // TODO Play with this number to find the best size
    return new ThumbnailCache(memoryClassBytes / 4);
  }
}