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Define strings

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Strings are typically stored in the resource file strings.xml. They are defined using a <string> XML element.

The purpose of strings.xml is to allow internationalisation. You can define a strings.xml for each language iso code. Thus when the system looks for the string ‘app_name’ it first checks the xml file corresponding to the current language, and if it is not found, looks for the entry in the default strings.xml file. This means you can choose to only localise some of your strings while not others.

/res/values/strings.xml 

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="app_name">Hello World App</string>
    <string name="hello_world">Hello World!</string>
</resources>

Once a string is defined in an XML resource file, it can be used by other parts of the app.

An app’s XML project files can use a <string> element by referring to @string/string_name. For example, an app’s manifest (/manifests/AndroidManifest.xml) file includes the following line by default in Android Studio: 

android:label="@string/app_name"

This tells android to look for a <string> resource called “app_name” to use as the name for the app when it is installed or displayed in a launcher.

Another time you would use a <string> resource from an XML file in android would be in a layout file. For example, the following represents a TextView which displays the hello_world string we defined earlier: 

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/hello_world"/>

You can also access <string> resources from the java portion of your app. To recall our same hello_world string from above within an Activity class, use: 

String helloWorld = getString(R.string.hello_world);
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Resources:
* Resources
* Define colors
* Color TransparencyAlpha Level
* Define strings
* Define String Plurals
* Define dimensions
* Define integer array
* Define a color state list
* Getting resources without deprecated warnings
* Patches
* String formatting in strings.xml
* Working with strings.xml file
* Define a menu resource and use it inside ActivityFragment
* Define integers
* Define string array
* Import array of objects defined in resources
* Translate a string
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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25 Android NDK
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27 Camera 2 API
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30 HttpURLConnection
31 SQLite
32 ADB Android Debug Bridge
33 ButterKnife
34 Supporting different screen resolutions
35 Glide
36 Retrofit2
37 Dialog
38 ACRA
39 GreenDAO
40 Formatting Strings
41 Notifications
42 AlarmManager
43 Fragments
44 Handler
45 Creating Custom Views
46 BroadcastReceiver
47 Activity
48 Snackbar
49 Runtime Permissions in API-23
50 Logging and using Logcat
51 VectorDrawable and AnimatedVectorDrawable
52 Tools Attributes
53 Toast
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58 The Manifest File
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60 MediaPlayer
61 Multidex and the Dex Method Limit
62 Data Synchronization with Sync Adapter
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65 Picasso
66 Bluetooth LE API
67 RoboGuice
68 Memory Leaks
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70 Volley
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74 In-app billing
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76 ContentProvider
77 Dagger 2
78 Realm
79 Unit testing in Android with JUnit
80 Android Versions
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83 Localization with resources
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87 Google Awarness APIs
88 Text to Speech (TTS)
89 UI Lifecycle
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92 Testing UI with Espresso
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94 GreenRobot EventBus
95 OkHttp
96 Enhancing Performance Using Icon Fonts
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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
106 Handling JSON with Gson
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
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118 Xposed
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122 Gesture Detection
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124 Android Sound and Media
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127 Callback URL
128 Twitter APIs
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133 RenderScript
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135 Swipe to Refresh
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137 Installing apps with ADB
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144 Email Validation
145 Keyboard
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150 EditText
151 Paypal Gateway Integration
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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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212 Dependency Injection with Dagger 2
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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227 Publish library to Maven repositories
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232 Autosizing TextView
233 Signing apps for release
234 Context
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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