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Example : How to Create a New Project/Android Apps First Time in Android Studio(version Koala 2024.1.1)?
Open a well set and properly configured Android Studio - Choose 'Projects' - Choose 'New Project' - Choose 'Phone and Tablet' templates - Choose 'Empty Views Activity' templates - Next - Put the Project/Application Name (by default My Application) - choose 'Save Location' to save the project - choose Language 'Java or Kotlin' - chosse minimum versions of SDK or Android os from where we want to applied this app. - Finish - Android Application opens with two major files, one for design purpose (main_activity.xml) and other for coding operations (MainActivity.java).
Example : How to change the Font and Font Size in an Android application?
Open Android Application/Project
File menu - Settings - Editor option - Font - Set the Font and Size - Ok.
Example : How to change the Theme in an Android application?
Open Android Application/Project.
File menu - Settings - Editor option - Color Scheme - Scheme - choose the desired theme from the list - Ok.
Example : How to Add a New Android Emulator/Virtual Device to an existing Android application/Project to see the Output/Result?
Open an Android Application first - click 'Tools' menu - click on 'Device Manager'
click 'add a new device' - choose 'Create Virtual Device'
choose a phone name from 'Phone' list' as Android Emulator to see the result - click 'Next' - choose the 'API' list - Next - Finish (certain downloads and installation will continue).
The selected phone emulator appeared in the 'Device Manager' list and is ready for displaying the result.
Example : How do we execute an Android application/project on an External Smartphone/Physical device to see the output/result?
Step 1: Open an Android Application first - click 'Tools' menu - click on 'Device Manager'.
Step 2: click 'Pair Devices Using Wi-Fi' from the appeared list as Wi-Fi symbol.
Step 3: choose anyone 'Pair using QR Code'/ 'Pair using pairing code' option.
Step 4: Now scan the appeared QR code when we choose 'Pair using QR Code' option through your mobile/smartphone ( for this your smartphone should be with Android OS 10/11 or above and with 'Wireless debugging' mode enabled).
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To enable 'Wireless debugging' in your mobile/smartphone -
Step 1: goto 'Settings' in your smartphone.
Step 2: Tap 'About phone' or 'About device' or 'My Phone' option.
Step 3: Tap 'Software information',if present otherwise Tap 'Build number' option 7 times continuously.
Step 4: Enter your pattern, PIN, or password if any, to enable the 'Developer options' menu.
Step 5: Use 'Back' option and tap 'System' menu to see the appeared "Developer options" in your menu list.
Step 6: Now Tap the 'Developer options' - search the list and Tap 'Wireless debugging' option.
Step 7: Now ON/enabled your 'Wi-Fi' network of your smartphone.
Step 8: Again tap 'Wireless debugging' option and tap 'Pair device with QR code' or 'Pair using pairing code' option.
Step 9: Now scan the QR code appeared in the Android Application - wait few moment, your mobile/smartphone will be connected to your Android Application
Step 10: After successfully connection, choose it during the running of your Android Application and see the result on your phone/smartphone.
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To Disable the Developer option of a smartphone for Security purpose After the completion of your work:-
Step 1: Settings - System - click on 'Developer options' - Turn off the slider button of 'Use Developer options'- Restart your smartphone.
Step 2: Developer options Disabled.
Example : How to Run an Android application of an existing Project?
Open an Android Application - 'Run' menu - click 'Run app' option (Shift+F10).
OR
Click on 'Run app' Play button on the standard toolbar.
NB: Android app data is automatically saved during Run process.
Example : How do we Create/Add different types of String Messages for use in an existing Android Application?
Path : click 'app' option in the left pane/side window in an open android application - Open/click 'res' (Resource) folder - click 'Values' folder - Open 'Strings.xml'file - Add different Strings messages with proper syntax as below-
<resources>
<string name="app_name">My Application</string>
<string name="msg1">Hello India</string>
<string name="msg2">Hello Bihar</string>
<string name="msg3">Hello India\nHello Bihar</string>
<string name="msg4">Enter a Value</string>
<string name="omsg">The Output is</string>
</resources>
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NB : We can also create Array form of String which is used in drop-down list or combo box as list contents in String.xml file as -
<resources>
<string-array name="Gender">
<item>Male</item>
<item>Female</item>
<item>Other</item>
</string-array>
</resources>
Example : How do we Create/Add different types of Colors for use in an existing Android application?
Path : click 'app' option in the left pane/side window in an open android application - Open/click 'res' (Resource) folder - click 'Values' folder - Open/click 'Colors.xml'file - Add different Colors with proper syntax as below -
<resources>
<color name="black">#FF000000</color>
<color name="white">#FFFFFFFF</color>
<color name="red">#ff0000</color>
<color name="green">#00FF00</color>
</resources>
Example : How do we Create/Add a new Activity page to an existing Android application?
Open an existing android application in which we want to add new activity page
click on 'app' option - click 'java' option - click 'com. ... android project name' option
Right click on 'com. ... android project name' option - click 'New' - click 'Activity' - click 'Empty Views Activity'
Now, both the newly created files 'MainActivity2.java'(app - java - com. ... android project name ) and 'activity_main2.xml'(app - res - layout) files /appeared at respected place.
Example : How do we Delete/Remove an Activity page from an existing Android application?
Right click on that files say 'MainActivity2.java' or 'activity_main2.xml' file.
Select and click 'Delete' button - ok.
Example : How do we Run a selected/desired/chosen Activity Page from multiple MainActivity pages (say here, MainActivity2.xml) in an existing Android application/Project?
To run any desired 'MainActivity.java' file from created multiple 'MainActivity2/3/4/5.java' files (say MainActivity2/3/4/5.java), put/set that particular activity page in the Top order of say here 'MainActivity2.java' file in 'manifests file' as below -
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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools">
<application android:allowbackup="true" android:dataextractionrules="@xml/data_extraction_rules" android:fullbackupcontent="@xml/backup_rules" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundicon="@mipmap/ic_launcher_round" android:supportsrtl="true" android:theme="@style/Theme.MyApplication" tools:targetapi="31">
<activity android:name=".MainActivity2" android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN"></action>
<category android:name="android.intent.category.LAUNCHER"></category>
</intent-filter>
</activity>
<activity android:name=".MainActivity3" android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN"></action>
<category android:name="android.intent.category.LAUNCHER"></category>
</intent-filter>
</activity>
<activity android:name=".MainActivity" android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN"></action>
<category android:name="android.intent.category.LAUNCHER"></category>
</intent-filter>
</activity>
</application>
</manifest>
NB: Here, 'MainActivity2.jave' file with activity_main2.xml file will be executed first because of it is set in top order of 'manifests file' as above.
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