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Android в„ў Notes for Professionals book

Androidв„ў Notes for Professionals book

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Chapters

1. Getting started with Android
2. Android Studio
3. Instant Run in Android Studio
4. TextView
5. AutoCompleteTextView
6. Autosizing TextViews
7. ListView
8. Layouts
9. ConstraintLayout
10. TextInputLayout
11. CoordinatorLayout and Behaviors
12. TabLayout
13. ViewPager
14. CardView
15. NavigationView
16. RecyclerView
17. RecyclerView Decorations
18. RecyclerView onClickListeners
19. RecyclerView and LayoutManagers
20. Pagination in RecyclerView
21. ImageView
22. VideoView
23. Optimized VideoView
24. WebView
25. SearchView
26. BottomNavigationView
27. Canvas drawing using SurfaceView
28. Creating Custom Views
29. Getting Calculated View Dimensions
30. Adding a FuseView to an Android Project
31. Supporting Screens With Different Resolutions, Sizes
32. ViewFlipper
33. Design Patterns
34. Activity
35. Activity Recognition
36. Split Screen / Multi-Screen Activities
37. Material Design
38. Resources
39. Data Binding Library
40. SharedPreferences
41. Intent
42. Fragments
43. Button
44. Emulator
45. Service
46. The Manifest File
47. Gradle for Android
48. FileIO with Android
49. FileProvider
50. Storing Files in Internal & External Storage
51. Zip file in android
52. Unzip File in Android
53. Camera and Gallery
54. Camera 2 API
55. Fingerprint API in android
56. Bluetooth and Bluetooth LE API
57. Runtime Permissions in API-23 +
58. Android Places API
59. Android NDK
60. DayNight Theme (AppCompat v23.2 / API 14+)
61. Glide
62. Dialog
63. Enhancing Alert Dialogs
64. Animated AlertDialog Box
65. GreenDAO
66. Tools Attributes
67. Formatting Strings
68. SpannableString
69. Notifications
70. AlarmManager
71. Handler
72. BroadcastReceiver
73. UI Lifecycle
74. HttpURLConnection
75. Callback URL
76. Snackbar
77. Widgets
78. Toast
79. Create Singleton Class for Toast Message
80. Interfaces
81. Animators
82. Location
83. Theme, Style, Attribute
84. MediaPlayer
85. Android Sound and Media
86. MediaSession
87. MediaStore
88. Multidex and the Dex Method Limit
89. Data Synchronization with Sync Adapter
90. PorterDuff Mode
91. Menu
92. Picasso
93. RoboGuice
94. ACRA
95. Parcelable
96. Retrofit2
97. ButterKnife
98. Volley
99. Date and Time Pickers
100. Localized Date/Time in Android
101. Time Utils
102. In-app Billing
103. FloatingActionButton
104. Touch Events
105. Handling touch and motion events
106. Detect Shake Event in Android
107. Hardware Button Events/Intents (PTT, LWP, etc.)
108. GreenRobot EventBus
109. Otto Event Bus
110. Vibration
111. ContentProvider
112. Dagger 2
113. Realm
114. Android Versions
115. Wi-Fi Connections
116. SensorManager
117. ProgressBar
118. Custom Fonts
119. Getting system font names and using the fonts
120. Text to Speech(TTS)
121. Spinner
122. Data Encryption/Decryption
123. OkHttp
124. Handling Deep Links
125. Crash Reporting Tools
126. Check Internet Connectivity
127. Creating your own libraries for Android applications
128. Device Display Metrics
129. Building Backwards Compatible Apps
130. Loader
131. ProGuard — Obfuscating and Shrinking your code
132. Typedef Annotations: @IntDef, @StringDef
133. Capturing Screenshots
134. MVP Architecture
135. Orientation Changes
136. Xposed
137. PackageManager
138. Gesture Detection
139. Doze Mode
140. Colors
141. Keyboard
142. RenderScript
143. Fresco
144. Swipe to Refresh
145. Creating Splash screen
146. IntentService
147. Implicit Intents
148. Publish to Play Store
149. Universal Image Loader
150. Image Compression
151. 9-Patch Images
152. Email Validation
153. Bottom Sheets
154. EditText
155. Speech to Text Conversion
156. Installing apps with ADB
157. Count Down Timer
158. Barcode and QR code reading
159. Android PayPal Gateway Integration
160. Drawables
161. TransitionDrawable
162. Vector Drawables
163. VectorDrawable and AnimatedVectorDrawable
164. Port Mapping using Cling library in Android
165. Creating Overlay (always-on-top) Windows
166. ExoPlayer
167. XMPP register login and chat simple example
168. Android Authenticator
169. AudioManager
170. AudioTrack
171. Job Scheduling
172. Accounts and AccountManager
173. Integrate OpenCV into Android Studio
174. MVVM (Architecture)
175. ORMLite in android
176. Retrofit2 with RxJava
177. ShortcutManager
178. LruCache
179. Jenkins CI setup for Android Projects
180. fastlane
181. Define step value (increment) for custom RangeSeekBar
182. Getting started with OpenGL ES 2.0+
183. Check Data Connection
184. Java on Android
185. Android Java Native Interface (JNI)
186. Notification Channel Android O
187. Robolectric
188. Moshi
189. Strict Mode Policy : A tool to catch the bug in the Compile Time.
190. Internationalization and localization (I18N and L10N)
191. Fast way to setup Retrolambda on an android project.
192. How to use SparseArray
193. Shared Element Transitions
194. Android Things
195. Library Dagger 2: Dependency Injection in Applications
196. JCodec
197. Formatting phone numbers with pattern.
198. Paint
199. What is ProGuard? What is use in Android?
200. Create Android Custom ROMs
201. Genymotion for android
202. ConstraintSet
203. CleverTap
204. Publish a library to Maven Repositories
205. adb shell
206. Ping ICMP
207. AIDL
208. Android game development
209. Android programming with Kotlin
210. Android-x86 in VirtualBox
211. Leakcanary
212. Okio
213. Bluetooth Low Energy
214. Looper
215. Annotation Processor
216. SyncAdapter with periodically do sync of data
217. Fastjson
218. JSON in Android with org.json
219. Gson
220. Android Architecture Components
221. Jackson
222. Smartcard
223. Security
224. How to store passwords securely
225. Secure SharedPreferences
226. Secure SharedPreferences
227. SQLite
228. Accessing SQLite databases using the ContentValues class
229. Firebase
230. Firebase Cloud Messaging
231. Firebase Realtime DataBase
232. Firebase App Indexing
233. Firebase Crash Reporting
234. Twitter APIs
235. Youtube-API
236. Integrate Google Sign In
237. Google signin integration on android
238. Google Awareness APIs
239. Google Maps API v2 for Android
240. Google Drive API
241. Displaying Google Ads
242. AdMob
243. Google Play Store
244. Sign your Android App for Release
245. TensorFlow
246. Android Vk Sdk
247. Project SDK versions
248. Facebook SDK for Android
249. Thread
250. AsyncTask
251. Testing UI with Espresso
252. Writing UI tests — Android
253. Unit testing in Android with JUnit
254. Inter-app UI testing with UIAutomator
255. Lint Warnings
256. Performance Optimization
257. Android Kernel Optimization
258. Memory Leaks
259. Enhancing Android Performance Using Icon Fonts
260. Bitmap Cache
261. Loading Bitmaps Effectively
262. Exceptions
263. Logging and using Logcat
264. ADB (Android Debug Bridge)
265. Localization with resources in Android
266. Convert vietnamese string to english string Android

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The Androidв„ў Notes for Professionals book is compiled from Stack Overflow Documentation, the content is written by the beautiful people at Stack Overflow. Text content is released under Creative Commons BY-SA. See credits at the end of this book whom contributed to the various chapters. Images may be copyright of their respective owners unless otherwise specified

Book created for educational purposes and is not affiliated with Androidв„ў group(s), company(s) nor Stack Overflow. All trademarks belong to their respective company owners

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Android Simple PDFViewer Examples

In this tutorial we will look at how to implement simple PDF Readers using ListView, GridView and recyclerview. We scan the device for a list of all the PDF documents in the device then list them in the adapterview. When the user clicks a single PDF Document, we render it in a new activity.

Example 1: Android GridView PDF View – List,Render,Page,Zoom

This is an android view pdf document programmitically tutorial and example.

We use pdf view android library called barteksc/AndroidPdfViewer, an open source pdf viewer library that is avaialble for free in android studio.

We create our project using android studio and we have the source available for download at the end of the tutorial.

Everybody knows PDFs, Portable Document Format. Am probably everybody has or uses them.Alot of information is rendered in PDFs and since android devices are the most popular devices around,we need a way of rendering these PDFs in our device.

Okay, there are PDF readers like Adobe and Foxit, but why not make yours as a side project while learning android development.Hey,with the wealth of libraries android has, its easier than you may think. You may make a quality PDF reader for yourself.

This is an example to introduce us by giving us a way to load PDFs into a GridView and render them. Then you can swipe through the pages,scroll, zoom a page etc. Here’s a summary of what we do :

• Read all PDF files from our SDCard and display in our GridView.
• We shall display PDF icons alongside the PDF name.
• We display these in a nice CardView in our custom gridview.
• When the user clicks a single PDF from our gridview, we open the corresponding PDF and view it in a new activity.
• There the user can scroll to read all the pages, or swipe side by side to move to next page.
• Moreover he can zoom in and out.

STEP BY STEP

STEP 1 : Our Build.Gradle

We are using Android PDF Viewer library so we need to add it as a dependency in our app level build.gradle.
Moreover our Custom GridView has CardViews as our viewitems so lets add the appropriate support libraries.

You may use the later versions of this library.

Our GridView will contain custom CardViews so we need to add the CardView dependency as well.

STEP 2 : Our AndroidManifest.xml

Given that we shall be reading our PDF documents from our File System in android device/emulator,lets add the permission for reading from external storage.

android.permission.READ_EXTERNAL_STORAGE allows us read files from the device’s external storage. Please make sure you add this as failure to do so will result in you being unable to read the external storage at runtime.

Moreover we will register two activities: one our main activity and the other the PDFViewer Activity.

STEP 3 : Our PDFDoc class

What are we working with PDF Documents. Yes, so lets do that in an Object Oriented way.Lets create a POJO data object to represent a PDF document with its properties like name and file path.

This is a data object that represents a single PDF document. The PDF will have the name and path as it’s properties.

We then generate their getters and setters.

STEP 4 : Our CustomAdapter class

Because we are working a custom gridview as our adapterview.It therefore needs its adapter.
Therefore We will derive from baseadapter, an abstract class from which other adapters like ArrayAdapter do derive.

This class shall inflate our model layout into CardView view items of our gridview. So basically this gridview will contain cardviews with PDF documents.

This adapter class is also responsible for adapting our dataset into those respective views. A single cardview is comprising of image and text.

First a Context object as well as an arraylist of PDF Documents is passed to us via the constructor:

We also open activity,pdf activity when an item is clicked. We will create a method to do that for us:

As you can see we are using an intent, first instantiating, passing in the context as well as the target class.

Then using the putExtra() we pass the PATH and start the activity to open it.

STEP 5 : Our MainActivity

This is our main activity. It will be extending the AppCompatActivity .

This activity is responsible for listing our pdf documents in a list of gridview. The user can the scroll through those pdf documents.

We will start by referencing the gridview by its id:

We are showing a gridview with cardviews with images and text. The images are the pdf icons while the textviews will show the pdf document name.

When the user clicks the pdf document, we render the document in a new activity.

We will also be retrieving our pdf documents from the device and hold them in an arraylist here.

We will have a method called getPDFs() . This method will read all PDF files from the Download’s directory in our external storage. In that way we can get the PDF names and their paths and assign them to a PDFDoc instance. Then return an arraylist of PDFDocs.

To do this first we get the downlaod’s folder:

Then ensure it actually exists:

Then read all the files inside it into a file array:

We will use the endsWith() method to filter out PDF documents:

STEP 5 : Our PDF Activity

This is the activity that actually renders the pdf document. The PDFs will be loaded from the device external storage and this activity will display them for viewing.

The path of the PDF document will be passed from the main activity via intent.

Then we load the pdf document via the path.

• This activity renders our PDF document.
• It receives the path to the PDF from our MainActivity and renders it.

As an Activity this class will also derive from AppCompatActivity:

We will reference the PDFView from our layout:

Beware that newer versions of PDF don’t require you to specify the ScrollBar as we did here.

We will unpack or retrieve data that was sent via Intent from our MainActivity then use the getExtras() to get the path that was passed.

We will create a file from that path:

Then check if that file can be read:

And load our PDF file into the PDFView:

STEP 6 : Our Layouts

Here’s our PDF Activity layout. All XML Layouts and source code are in the link below so please download it and run.

We have a RelativeLayout as our root layout.

We then specify the PDFView element in our XML document. This will be responsible for rendering or viewing our pdf document.

How To Download and Run

• Download the project above.
• You’ll get a zipped file,extract it.
• Open the Android Studio.
• Now close, already open project
• From the Menu bar click on File >New> Import Project
• Now Choose a Destination Folder, from where you want to import project.
• Choose an Android Project.
• Now Click on “OK“.
• Done, your importing Project.
• Obviously you must have the PDFs you wanna display.

Example 2: Android PDF Reader with ListView.

This is a tutorial about implementing a basic PDF Reader using ListView and third party PDF Rendering library.

We will list PDF items from external storage into a ListView. When you click a PDF item, a new PDF Reader activity is opened and you can read the PDF with advanced capabilities like zooming, scrolling, swiping and pagination.

Gradle Scripts

Given we are using a third party PDF Renderer, we need to add dependencies in the app level build.gradle .

1. Build.gadle

• Go over and dependencies. We are using android-pdf-viewer library.

LAYOUTS

We’ll work with 4 layouts:

1. activity_main.xml

• Our MainActivity layout.
• Root layout is CordinatorLayout .
• This layout defines:
  1. appbar
  2. Toolbar
  3. FloatingActionButton.
• We also include our content_main.xml here.

2. content_main.xml

• Still part of our MainActivity layout.
• Root layout is RelativeLayout
• It gets included inside the activity_main.xml .
• Will hold our ListView onto which our PDFs will be displayed.

3. model.xml

• Will model our custom rows for our listview.
• The listview should contain images and text. The images will be an icon to indicate a PDF. Thus the user knows the list contains PDFs.
• At the root tag is a android.support.v7.widget.CardView .

4. activity_pdf.xml

• Now this layout will be our PDF render layout.
• It’s our PDF Viewer layout.

JAVA CLASSES

Let’s now look at our 4 Java classes.

1. PDFDoc.java

This is our data object. Our POJO class.

POJO stands for Plain Old Java Object. We use this class to represent our data entity. In this case a PDF document.

This class will hold the PDF’s:

2. CustomAdapter.java

This is our adapter class. It will derive from android.widget.BaseAdapter . This is what makes the class an adapter.

Then we’ll override a couple of methods given that BaseAdapter is an abstract class.

An adapter class basically adapts data to custom views. Like in our case we have a ListView with images and text. well that’s a custom listview. So we need the adapter class to help in binding the data to this listview.

We also handle OnClick event for our ListView here. Hence opening the PDF Activity to view/read the PDF document.

3. PDFActivity.java

This is class is an activity because we derive from android.support.v7.app.AppCompatActivity , which is a support version of android.app.activity .

This class is our PDF Renderer/PDF Viewer. Users will read PDF documents here.

The first activity( MainActivity ) will be responsible for listing pdf documents. This activity, however, will be responsible or viewing them.

4. MainActivity.java

This is our launcher activity. This means when the app is run it is this activity that gets executed by default.

This class derives from android.support.v7.app.AppCompatActivity .

We proceed and override the OnCreate(0 method.

We will read our android external storage to obtain PDF documents from downloads directory here.

We will then list these pdf documents in the mainactivity.

AndroidManifest.xml

Add this permission in your androidmanifest:

Download

Download code below.

Download the source code here.

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