Essential Books

Clearing an activity stack

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Sometimes you may want to start a new activity while removing previous activities from the back stack, so the back button doesn’t take you back to them. One example of this might be starting an app on the Login activity, taking you through to the Main activity of your application, but on logging out you want to be directed back to Login without a chance to go back. In a case like that you can set the FLAG_ACTIVITY_CLEAR_TOP flag for the intent, meaning if the activity being launched is already running in the current task (LoginActivity), then instead of launching a new instance of that activity, all of the other activities on top of it will be closed and this Intent will be delivered to the (now on top) old activity as a new Intent. 

Intent intent = new Intent(getApplicationContext(), LoginActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);

It’s also possible to use the flags FLAG_ACTIVITY_NEW_TASK along with FLAG_ACTIVITY_CLEAR_TASK if you want to clear all Activities on the back stack: 

Intent intent = new Intent(getApplicationContext(), LoginActivity.class);
// Closing all the Activities, clear the back stack.
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
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Intent:
* Intent
* Getting a result from another Activity
* Passing data between activities
* Open a URL in a browser
* Starter Pattern
* Clearing an activity stack
* Start an activity
* Open Google Play Store Listing for your app
* Pass data from Activity to Fragment using Bundle
* Sending emails
* CustomTabsIntent for Chrome Custom Tabs
* Intent URI
* Start the dialer
* Broadcasting Messages to Other Components
* Passing custom object between activities
* Share intent
* Passing different data through Intent in Activity
* Open Google map with specified latitude longitude
* Showing a File Chooser and Reading the Result
* Open Google Play Store with the list of all applications from your publisher account
* Sharing Multiple Files through Intent
* Start Unbound Service using an Intent
* Implicit and Explicit Intents
* Getting a result from Activity to Fragment
Table Of Contents
0 Getting Started
1 Layouts
2 Gradle
3 RecyclerView onClickListeners
4 NavigationView
5 Intent
6 JSON handling with org.json
7 Android Studio
8 Resources
9 Data Binding Library
10 Exceptions
11 Getting Calculated View Dimensions
12 AsyncTask
13 SharedPreferences
14 Emulator
15 Material Design
16 Lint Warnings
17 Service
18 Storing Files in Internal and External Storage
19 WebView
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21 RecyclerView
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27 Camera 2 API
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34 Supporting different screen resolutions
35 Glide
36 Retrofit2
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38 ACRA
39 GreenDAO
40 Formatting Strings
41 Notifications
42 AlarmManager
43 Fragments
44 Handler
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47 Activity
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49 Runtime Permissions in API-23
50 Logging and using Logcat
51 VectorDrawable and AnimatedVectorDrawable
52 Tools Attributes
53 Toast
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56 Location
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58 The Manifest File
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61 Multidex and the Dex Method Limit
62 Data Synchronization with Sync Adapter
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64 Instant Run in Android Studio
65 Picasso
66 Bluetooth LE API
67 RoboGuice
68 Memory Leaks
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70 Volley
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72 Date and Time Pickers
73 Integrate Google Sign In
74 In-app billing
75 FloatingActionButton
76 ContentProvider
77 Dagger 2
78 Realm
79 Unit testing in Android with JUnit
80 Android Versions
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82 SensorManager
83 Localization with resources
84 ProgressBar
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87 Google Awarness APIs
88 Text to Speech (TTS)
89 UI Lifecycle
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91 Data Encryption / Decryption
92 Testing UI with Espresso
93 Writing UI tests
94 GreenRobot EventBus
95 OkHttp
96 Enhancing Performance Using Icon Fonts
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98 Canvas drawing using SurfaceView
99 Firebase
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101 Check Internet Connectivity
102 Facebook SDK
103 Unzip File
104 Android Places API
105 Creating your own libraries
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107 Device Display Metrics
108 TextView
109 ListView
110 Building Backwards Compatible Apps
111 Loader
112 ProGuard - Obfuscating and Shrinking your code
113 Detect Shake Event
114 Typedef Annotations
115 Capturing Screenshots
116 MVP Architecture
117 Orientation Changes
118 Xposed
119 Security
120 PackageManager
121 ImageView
122 Gesture Detection
123 Doze Mode
124 Android Sound and Media
125 SearchView
126 Camera and Gallery
127 Callback URL
128 Twitter APIs
129 SqlCipher integration
130 Drawables
131 Colors
132 ConstraintLayout
133 RenderScript
134 Fresco
135 Swipe to Refresh
136 AutoCompleteTextView
137 Installing apps with ADB
138 IntentService
139 AdMob
140 Implicit Intents
141 Publish to Play Store
142 Firebase Realtime Database
143 Image Compression
144 Email Validation
145 Keyboard
146 Button
147 TextInputLayout
148 Bottom Sheets
149 CoordinatorLayout and Behaviors
150 EditText
151 Paypal Gateway Integration
152 Firebase App Indexing
153 Firebase Crash Reporting
154 Displaying Google Ads
155 Vk SDK
156 Localized DateTime
157 Count Down Timer
158 Reading Barcode and QR codes
159 Otto Event Bus
160 TransitionDrawable
161 Port Mapping using Cling
162 Creating Overlay always-on-top Windows
163 ExoPlayer
164 Inter-app UI testing with UIAutomator
165 MediaSession
166 Speech to Text Conversion
167 FileProvider
168 Publish .aar file to Apache Archive with Gradle
169 XMPP
170 Authenticator
171 RecyclerView and LayoutManagers
172 AudioManager
173 Job Scheduling
174 Accounts and AccountManager
175 OpenCV
176 Split Screen Multi-Screen Activities
177 Threads
178 MediaStore
179 Time Utils
180 Touch Events
181 Fingerprint API
182 MVVM Architecture
183 BottomNavigationView
184 ORMLite
185 YouTube API
186 TabLayout
187 Retrofit2 with RxJava
188 DayNight Theme AppCompat
189 ShortcutManager
190 LruCache
191 Using Jenkins CI
192 Zip files
193 Vector Drawables
194 Fastlane
195 Define step value for RangeSeekBar
196 Getting started with OpenGL ES 2.0
197 Check Data Connection
198 Java Native Interface (JNI)
199 FileIO
200 Perfomance Optimization
201 Robolectric
202 Moshi
203 Strick Mode Policy
204 Internalization and localization
205 Retrolambda
206 SparseArray
207 Firebase Cloud Messaging
208 Shared Element Transitions
209 Android Things
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213 Formatting phone numbers
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215 Android Kernel Optimization
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219 Create Android Custom ROMs
220 Java on Android
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222 Genymotion for Android
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224 Creating Splash screen
225 ConstraintSet
226 CleverTap
227 Publish library to Maven repositories
228 ADB shell
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230 AIDL
231 Using Kotlin
232 Autosizing TextView
233 Signing apps for release
234 Context
235 Activity Recognition
236 Secure SharedPreferences
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238 Bitmap Cache
239 Android x86 in VirtualBox
240 JCodec
241 Design Patterns
242 Okio
243 Google SignIn integration
244 TensorFlow
245 Game developmen
246 Notification Channel
247 Bluetooth Low Energy (LE)
248 Leak Canary
249 FuseView
250 SQLite using ContentValues
251 Enhancing Alert Dialogs
252 Hardware Button Events, Intents PTT
253 SpannableString
254 Looper
255 Optimized VideoView
256 Google Drive API
257 Animated AlertDialog Box
258 Annotation Processor
259 SyncAdapter with periodically do sync of data
260 Singleton Class for Toast Message
261 Fastjson
262 Android Architecture Components
263 Jackson
264 Play Store
265 Loading Bitmaps Effectively
266 Getting system font names
267 Smartcard
268 Convert vietnamese string to english
269 Contributors