Develop Reference

(Kotlin) Number guessing game doesn't register the correct userInput. Any tips?

Super new to kotlin. My code seems to be bugging out at this line:
else if (userInput == randomNumber){
message = "Horray! You got it!\n Play again?"
}
Seems like a quick fix but I'm not sure...When I input according to the hint, it doesn't register the correct answer at all. It's stuck on "higher/lower" and gives no option for the game to end. I'll attach the entire thing if it helps:
Thanks so much in advance.
import android.os.Bundle
import android.widget.Button
import androidx.appcompat.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_main.*
import android.view.inputmethod.InputMethodManager
import android.view.View
import android.widget.Toast
import kotlin.random.Random
import kotlin.random.Random.Default.nextInt
class MainActivity : AppCompatActivity() {
private var userAttempts = 0
private val UPPER_BOUND = 100
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
fun buttonClick(view: View){
val userInput = numberGuess.text.toString().toInt()
userAttempts ++;
val randomNumber = generateRandomNumber();
var message = ""
if (userInput < randomNumber) {
message = "Higher!"
}
else if (userInput > randomNumber) {
message = "Lower!"
}
else if (userInput == randomNumber){
message = "Horray! You got it!\n Play again?"
}
hint.text = message
attempts.text = "attempts: " + userAttempts
numberGuess.text.clear()
}
private fun generateRandomNumber(): Int {
return Random.nextInt(UPPER_BOUND)
}
}

Kotlin- Sceneform - Load .sfb models from server direct. Not working

Iam and AR android app. I can load my .sfb files from asset. i want to load from direct server in order to secure my assets. Its loading from asset folder. not from direct server. iam using below code pls help me to solve this.
package com.example.a320_ar
import android.net.Uri
import android.os.Build
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.MotionEvent
import android.view.View
import android.widget.Button
import android.widget.Toast
import androidx.annotation.RequiresApi
import androidx.appcompat.app.AlertDialog
import com.google.ar.core.Anchor
import com.google.ar.core.Plane
import com.google.ar.sceneform.AnchorNode
import com.google.ar.sceneform.HitTestResult
import com.google.ar.sceneform.SkeletonNode
import com.google.ar.sceneform.animation.ModelAnimator
import com.google.ar.sceneform.rendering.ModelRenderable
import com.google.ar.sceneform.ux.ArFragment
import com.google.ar.sceneform.ux.TransformableNode
import kotlinx.android.synthetic.main.activity_main.*
import java.io.File
class MainActivity : AppCompatActivity() {
lateinit var arFragment: ArFragment
private lateinit var model: Uri
private var rendarable: ModelRenderable?=null
private var animator: ModelAnimator? = null
//private var modellink:String = "A320_Anim.sfb"
private var modellink:String = "http://10.0.0.193:90/fbx/A320_Anim.sfb"
#RequiresApi(Build.VERSION_CODES.N)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
arFragment = sceneform_fragment as ArFragment
arFragment.setOnTapArPlaneListener { hitResult, plane, motionEvent ->
if (plane.type != Plane.Type.HORIZONTAL_UPWARD_FACING) {
return#setOnTapArPlaneListener
}
var anchor = hitResult.createAnchor()
btnStart.setOnClickListener {
placeObject(
arFragment,
anchor,
Uri.parse(modellink)
)
}
}
}
#RequiresApi(Build.VERSION_CODES.N)
private fun animateModel(name: String) {
animator?.let { it->
if(it.isRunning){
it.end()
}
}
rendarable?.let { modelRenderable ->
val data = modelRenderable.getAnimationData(name)
animator = ModelAnimator(data,modelRenderable)
animator?.start()
}
}
#RequiresApi(Build.VERSION_CODES.N)
private fun placeObject(arFragment: ArFragment, anchor: Anchor?, model: Uri?) {
ModelRenderable.builder()
.setSource(arFragment.context,model)
.build()
.thenAccept{
rendarable = it
addtoScene(arFragment, anchor, it)
}
.exceptionally {
val builder = AlertDialog.Builder(this)
builder.setMessage( it.message).setTitle("Error")
val dialog = builder.create()
dialog.show()
return#exceptionally null
}
}
private fun addtoScene(arFragment: ArFragment, anchor: Anchor?, it: ModelRenderable?) {
val anchorNode = AnchorNode(anchor)
val skeletonNode = SkeletonNode()
skeletonNode.renderable = rendarable
Toast.makeText(this,"inside add scene",Toast.LENGTH_SHORT).show()
val node = TransformableNode(arFragment.transformationSystem)
node.addChild(skeletonNode)
node.setParent(anchorNode)
node.setOnTapListener { v: HitTestResult?, event: MotionEvent? ->
//msgText.text = "Tapped me...$anchorNode --- $anchor --- $skeletonNode"
// var bt = findViewById<Button>(R.id.btnDel)
//bt.visibility = View.VISIBLE
//removeAnchorNode(anchorNode)
//bt.setOnClickListener { removeAnchorNode(anchorNode) }
}
arFragment.arSceneView.scene.addChild(anchorNode)
}
}
its working fine no errors. but its not showing my object on fragment.
private var modellink:String = "http://10.0.0.193:90/fbx/A320_Anim.sfb" (not loading .sfb)
private var modellink:String = "A320_Anim.sfb" (Loading the .sfb- woring fine)
please help me to load the model directly from server. i used all the permissions correctly.
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.CAMERA"/>
Thanks in advance,
Syed Abdul Rahim

Are you still using the old 1.6 version of Sceneform? You could try the new maintained version and also discard the sfb format and switch to glTF. The maintained version is up to date related to android dependencies and ARCore/Filament.
Well to your second question, if you want to secure your assets you have to serve it from a password protected API-Endpoint, but you have to host your own server, maybe some simpler solutions exists. Strings or text files can be directly secured with on board libraries (https://developer.android.com/guide/topics/security/cryptography)

FlutterActivity MethodChannel and FlutterView

So I wrote a Flutter App about 4 Months ago. Now I wanted to do a small change, but I can't compile the app anymore, because GeneratedPluginRegistrant.registerWith(this) doesn't work anymore, I didn't change the Kotlin code only the Dart code.
The "this" in "GeneratedPluginRegistrant.registerWith(this)" shows me this error:
Type mismatch.
Required: FlutterEngine!
Found: MainActivity
The MainActivity Class:
import android.os.Bundle
import io.flutter.app.FlutterActivity
import io.flutter.plugin.common.MethodChannel
import io.flutter.plugins.GeneratedPluginRegistrant
import io.flutter.view.FlutterMain
class MainActivity : FlutterActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
GeneratedPluginRegistrant.registerWith(this) // here is the error: Type mismatch. Required: FlutterEngine! Found: MainActivity
MethodChannel(flutterView, CHANNEL).setMethodCallHandler { call, result ->
if (call.method == "helloFromNativeCode") {
val greetings = helloFromNativeCode()
result.success(greetings)
}
}
}
private fun helloFromNativeCode(): String {
return "Hello from Native Android Code"
}
companion object {
private const val CHANNEL = "flutter.native/helper"
}
}
And if is use:
import io.flutter.embedding.android.FlutterActivity
instead of
import io.flutter.app.FlutterActivity
I can use
override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
GeneratedPluginRegistrant.registerWith(flutterEngine);
}
but have trouble with:
MethodChannel(flutterView, CHANNEL).setMethodCallHandler { call, result ->
if (call.method == "helloFromNativeCode") {
val greetings = helloFromNativeCode()
result.success(greetings)
}
}
because i get an error on flutterView:
Unresolved reference: flutterView
The code would look like this:
import android.os.Bundle
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugin.common.MethodChannel
import io.flutter.plugins.GeneratedPluginRegistrant
import io.flutter.view.FlutterMain
class MainActivity : FlutterActivity() {
override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
GeneratedPluginRegistrant.registerWith(flutterEngine);
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
MethodChannel(flutterView, CHANNEL).setMethodCallHandler { call, result -> // here is the error
if (call.method == "helloFromNativeCode") {
val greetings = helloFromNativeCode()
result.success(greetings)
}
}
}
private fun helloFromNativeCode(): String {
return "Hello from Native Android Code"
}
companion object {
private const val CHANNEL = "flutter.native/helper"
}
}
I hope someone can help me.

Instead of flutterView use flutterEngine.getDartExecutor().

I spent days trying to figure out how to add a Flutter UI to my existing Android App. The biggest challenge was getting the MethodChannel to work with FlutterActivity being called from MainActivity. I know this is a little different than the question asked here, but this post was returned when I did searches for 'Android FlutterActivity MethodChannel'. After going through many resources on how to do this, I finally found my solution here:
https://github.com/flutter/samples/tree/master/add_to_app/android_using_plugin/app/src/main/java/dev/flutter/example/androidusingplugin
Initially, in Android Studio, with the existing app opened, I tapped File, New, New Module, Flutter Module. I received an error and had to perform manual steps.
My objective is to launch FlutterActivity (opens main.dart in the flutter_module) in MainActivity - onCreate, then develop Flutter 'screens' leveraging as much native Flutter code as possible, with limited Platform calls using the MethodChannel. As I develop replacement Flutter code, I will continue to comment on the existing Android Code.
Here is what finally worked for me:
../App_Project/Android/Existing_Android_App/settings.gradle
include ':app'
setBinding(new Binding([gradle: this]))
evaluate(new File(settingsDir.parentFile, '../flutter_module/.android/include_flutter.groovy'))
include ':flutter_module’
project(':flutter_module’).projectDir = new File('../../flutter_module’)
rootProject.name=‘existing_android_app’
../App_Project/Android/Existing_Android_App/app/build.gradle
dependencies {
…
implementation project(':flutter')
}
../App_Project/Android/Existing_Android_App/app/src/main/AndroidManifest.xml
<activity
android:name="io.flutter.embedding.android.FlutterActivity"
android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
android:hardwareAccelerated="true"
android:windowSoftInputMode="adjustResize" />
../App_Project/Android/Existing_Android_App/app/src/main/java/com/existing_android_app/MainActivity.java
package com.existing_android_app;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import io.flutter.embedding.android.FlutterActivity;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.embedding.engine.FlutterEngineCache;
import io.flutter.embedding.engine.dart.DartExecutor;
import io.flutter.plugin.common.MethodCall;
import io.flutter.plugin.common.MethodChannel;
public class MainActivity extends AppCompatActivity {
final String ENGINE_ID = "1";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FlutterEngine flutterEngine = new FlutterEngine(this);
flutterEngine.getDartExecutor().executeDartEntrypoint(DartExecutor.DartEntrypoint.createDefault());
FlutterEngineCache.getInstance().put(ENGINE_ID, flutterEngine);
MethodChannel channel = new MethodChannel(flutterEngine.getDartExecutor(), "com.existing_android_app/myMethodChannel");
channel.setMethodCallHandler(
new MethodChannel.MethodCallHandler() {
#Override
public void onMethodCall(#NonNull MethodCall call, #NonNull MethodChannel.Result result) {
String url = call.argument("url");
if (call.method.equals("openBrowser")) {
openBrowser(url);
}
else {
result.notImplemented();
}
}
});
startActivity(FlutterActivity.withCachedEngine(ENGINE_ID).build(this));
}
void openBrowser(String url) {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse(url));
this.startActivity(intent);
}
}
../App_Project/flutter_module/lib/home_page.dart
class AppHomePage extends StatefulWidget {
#override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<AppHomePage> {
static const platform = const MethodChannel(‘com.existing_android_app/myMethodChannel’);
Future<void> _openBrowser() async {
try {
final int result = await platform.invokeMethod('openBrowser', <String, String> { 'url': "http://bing.com" });
}
catch (e) {
print('***** _openBrowser error: ' + e.toString());
}
}
#override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
appBar: CustomAppBar(),
body: Column(
children: <Widget>[
RaisedButton(
label: Text('Search',
style: TextStyle(fontSize: 18.0),
),
onPressed: () { _openBrowser(); },
) // RaisedButton.icon
], // Widget
) // Column
) // Scaffold
); // SafeArea
}

You should use
import io.flutter.embedding.android.FlutterActivity;
and declare your patformChannel in
#Override
public void configureFlutterEngine(#NonNull FlutterEngine flutterEngine) {
GeneratedPluginRegistrant.registerWith(flutterEngine);
new MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(), CHANNEL)
.setMethodCallHandler(
(call, result) -> {
// Note: this method is invoked on the main thread.
// TODO
}
);
}
for more you can check the documentation: https://flutter.dev/docs/development/platform-integration/platform-channels

You can use method channel and flutter engine like this.
private val CHANNEL = "adb"
override fun configureFlutterEngine(#NonNull flutterEngine: FlutterEngine) {
GeneratedPluginRegistrant.registerWith(flutterEngine)
MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(), CHANNEL)
.setMethodCallHandler { call, result ->
//You can use your custom function for example:
if (call.method.equals("checkingadb")) {
checkingadb(call, result)
} else {
result.notImplemented()
}
}
}
private fun checkingadb(call: MethodCall, result: MethodChannel.Result) {
if (Settings.Secure.getInt(this.getContentResolver(), Settings.Secure.ADB_ENABLED, 0) === 1) {
// debugging enabled
result.success(1)
} else {
// debugging is not enabled
result.success(0)
}
}

To pass flutter Engine value we can use provideFlutterEngine(this) method. And for flutterView we can use flutterEngine.dartExecutor. Here is the url for code snippet ,have answered it earlier
https://stackoverflow.com/a/67698834/11887774 .

PowerMock `thenReturn` doesn't return expected data for mocked static method?

I am able to tun my test but it fails. The problem is, mocked method is still returning wrong data. This is my method that I want to test it:
fun getTextByLanguage(list: List<TitleModel>) : String {
val deviceLanguage = Locale.getDefault().language
var default = ""
for (item in list) {
if (item.culture.contains(deviceLanguage, true)) return item.value
if (item.culture.contains("en", true)) default = item.value
}
return default
}
And this is how I am testing the method:
import junit.framework.TestCase.assertEquals
import org.junit.Test
import org.junit.runner.RunWith
import org.powermock.api.mockito.PowerMockito.*
import org.powermock.core.classloader.annotations.PrepareForTest
import org.powermock.modules.junit4.PowerMockRunner
import java.util.Locale
#RunWith(PowerMockRunner::class)
#PrepareForTest(Locale::class)
class AppConfigUtilityByPowerMockTest {
#Test
fun `getTextByLanguage, test en`() {
mockStatic(Locale::class.java)
val mockedLocal = mock(Locale::class.java)
`when`(Locale.getDefault()).thenReturn(mockedLocal)
`when`(mockedLocal.language).thenReturn("en")
val list = listOf(TitleModel("en-ca", "Home"), TitleModel("fr-ca", "HomeFr"))
val actual = getTextByLanguage(list)
assertEquals("Home", actual)
}
#Test
fun `getTextByLanguage, test fr`() {
mockStatic(Locale::class.java)
val mockedLocal = mock(Locale::class.java)
`when`(Locale.getDefault()).thenReturn(mockedLocal)
`when`(mockedLocal.language).thenReturn("fr")
val list = listOf(TitleModel("en-ca", "Home"), TitleModel("fr-ca", "HomeFr"))
val actual = getTextByLanguage(list)
assertEquals("HomeFr", actual)
}
}
The first test cases without problem but the second one fails. This is the out put:
junit.framework.ComparisonFailure: expected:<Home[Fr]> but was:<Home[]>
Expected :HomeFr
Actual :Home

One way to answer the question is to get rid of Local class from the method and do stuff in Kotlin way. So, what I did is to change my original method like this:
fun getTextByLanguage(list: List<TitleModel>, deviceLanguage: String = getDeviceLanguage()) : String {
var default = ""
for (item in list) {
if (item.culture.contains(deviceLanguage, true)) return item.value
if (item.culture.contains("en", true)) default = item.value
}
return default
}
fun getDeviceLanguage(): String {
return Locale.getDefault().language
}
Now my test class looks like this:
import junit.framework.TestCase.assertEquals
import org.junit.Test
import org.junit.runner.RunWith
import org.powermock.core.classloader.annotations.PrepareForTest
import org.powermock.modules.junit4.PowerMockRunner
import java.util.Locale
#RunWith(PowerMockRunner::class)
#PrepareForTest(Locale::class)
class AppConfigUtilityByPowerMockTest {
#Test
fun `getTextByLanguage, test en`() {
val list = listOf(TitleModel("en-ca", "Home"), TitleModel("fr-ca", "HomeFr"))
val actual = getTextByLanguage(list, "en")
assertEquals("Home", actual)
}
#Test
fun `getTextByLanguage, test fr`() {
val list = listOf(TitleModel("en-ca", "Home"), TitleModel("fr-ca", "HomeFr"))
val actual = getTextByLanguage(list, "fr")
assertEquals("HomeFr", actual)
}
}
Although my test passes, I am still willing to see your recommendation and down to accept your answer to my question.

A simple birth year calculator using Kotlin

I start doing a simple android app for practice to calculate the age with Kotlin programming language, the error came from the line 34, can someone help me with this and fix it to know where is my wrong because I am just very beginner
package com.calcult.age.agecalcult
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_main.*
import java.util.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
var my_age_number = ageText.text!!
var my_month_number = ageText2.text!!
var my_day_number = ageText3.text!!
var calcult_age_button = doIT
calcult_age_button.setOnClickListener {
if(my_age_number.isEmpty()){
Toast.makeText(this,"ادخل سنه ميلادك !",Toast.LENGTH_LONG).show()
}else if (my_age_number.length < 4 || my_age_number.length > 4){
Toast.makeText(this,"ادخل سنه ميلاديه صالحه الأستعمال !",Toast.LENGTH_LONG).show()
}else if (my_age_number.length == 4){
fun getAge(){
val get_the_year = Calendar.getInstance().get(Calendar.YEAR);
val calculat_the_age = my_age_number - get_the_year
}
}
}
}
}

my_age_number is a String value, so you should try
var calculat_the_age: Int? = null
try {
calculat_the_age = my_age_number.toInt() - Calendar.getInstance().get(Calendar.YEAR)
} catch (ex: NumberFormatException) {
// my_age_number not a number
}
hope this helps!