Develop Reference

SpeechRecognizer is not available on my android emulator. Kotlin

I am new to android application development and I am trying to create a voice assistant in Kotlin. When I try to use my microphone it seems that my SpeechRecognizer doesn't work. I followed the directions of this video, but when I test my app on emulator it seems that SpeechRecognizer isn't avaiable. I also tried this issue on github, but it didn't help me.
The result is always the same. I always get the text string I wrote in case the SpeechRecognizer.isRecognitionAvailable is not available.
Here is what i have tried to do:
Add all permition to my application from android settings
Enable the microphone from emulator settings
Here is my scrips:
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.firstkotlinproject">
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<uses-permission android:name="android.speech.RecognitionService"/>
<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.FirstKotlinProject"
tools:targetApi="31">
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:background="#525252">
<TextView
android:id="#+id/textView_to_change"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#FFA500"
android:textSize="24sp"
android:text="Hello"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/button_to_click"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView_to_change"
android:textColor="#FFA500"
android:backgroundTint="#000"/>
</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity
package com.example.firstkotlinproject
import android.app.Activity
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.speech.RecognizerIntent
import android.speech.SpeechRecognizer
import android.widget.Button
import android.widget.TextView
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_main.*
import java.util.*
import kotlin.collections.ArrayList
class MainActivity : AppCompatActivity() {
private val requestCodeDefoult = 102
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
button_to_click.setOnClickListener {
askSpeechInput()
}
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (requestCode == requestCodeDefoult && resultCode == Activity.RESULT_OK) {
val result :ArrayList<String>? = data?.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS)
textView_to_change.text = result?.get(0).toString()
}
}
private fun buttonPressed() :Boolean {
var result = false
if (button_to_click.isPressed) {
result = true
}
return result
}
private fun askSpeechInput() {
if (!SpeechRecognizer.isRecognitionAvailable(this)) {
Toast.makeText(this, "Speech recognition is not avaiable!", Toast.LENGTH_SHORT).show()
} else if (!buttonPressed()) {
Toast.makeText(this, "Press the button to speak", Toast.LENGTH_SHORT).show()
} else {
val i = Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH)
i.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,RecognizerIntent.LANGUAGE_MODEL_FREE_FORM)
i.putExtra(RecognizerIntent.EXTRA_LANGUAGE, Locale.ITALIAN)
i.putExtra(RecognizerIntent.EXTRA_PROMPT, "Say something...")
startActivity(i)
}
}
}

My application keep crashing when I click on the convert button even though my codes have no fatal errors

I am trying to build an application for my mini assignment, it is to create a temp converter tool. However, most of the codes out there are in java and since my assignment must be done in Kotlin. I must figure a way out myself.
This is my current code, and as you can see there are no errors, but when I click on the convert button, it will say my application crash.
Activity.kt
package edu.blabladmaoa.travelapp
import android.content.Intent
import android.os.Bundle
import android.provider.MediaStore
import android.widget.*
import androidx.appcompat.app.AppCompatActivity
import org.w3c.dom.Text
class TempConverterActivity : AppCompatActivity() {
val TAG: String = "TempConverter"
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_temp_converter)
val userinput = findViewById<EditText>(R.id.editTextTemp)
val optionFah = findViewById<RadioButton>(R.id.radioButtonFah)
val optionCel = findViewById<RadioButton>(R.id.radioButtonCel)
val convertbutton = findViewById<Button>(R.id.convertbutton)
val clearbutton = findViewById<Button>(R.id.clearbutton)
val results = findViewById<TextView>(R.id.tempresult)
// now the buttons are identified, i will set the each button to have their own listener
convertbutton.setOnClickListener{
if (optionFah.isChecked()){
val newinput = userinput.toString().toFloat()
results.setText(convertCelsiusToFahrenheit(newinput).toString())
}
else if (optionCel.isChecked()){
val newinput = userinput.toString().toFloat()
convertFahrenheitToCelsius(newinput)
results.setText(convertCelsiusToFahrenheit(newinput).toString())
}
}
clearbutton.setOnClickListener{
userinput.text.clear()
}
}
private fun convertFahrenheitToCelsius(fahrenheit: Float): Float {
return ((fahrenheit - 32) * 5 / 9)
}
private fun convertCelsiusToFahrenheit(celsius: Float): Float {
return ((celsius * 9) / 5) + 32
}
}
activity.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- i use "phone" to show numpad instead of normal keyboard-->
<EditText
android:id="#+id/editTextTemp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="number"
android:hint="Enter temperature here" />
<RadioButton
android:id="#+id/radioButtonFah"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="to Fahrenheit" />
<RadioButton
android:id="#+id/radioButtonCel"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="to Celcius" />
<Button
android:id="#+id/convertbutton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Convert" />
<Button
android:id="#+id/clearbutton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Clear" />
<TextView
android:id="#+id/tempresult"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
Android_Manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="edu.blabladmaoa.travelapp">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/Theme.TravelApp">
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".TempConverterActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Expected Output

val newinput = userinput.toString().toFloat()
Here you are trying to convert an EditText object to a string using the toString() method. This will not give you the desired output.
You can access the text attribute of the class EditText. This returns the content of the EditText view as a string. Please, see below.
val newInput = userInput.text.toString().toFloat()

instead of taking the text from the input you are calling toString() on the EditText itself
you need to change
val newinput = userinput.toString().toFloat()
to
val newinput = userinput.text.toString().toFloat()
Also as mentioned by Tenfour04 in the comments it will also crash if you press convert when you leave the EditText empty

You should check that your edittext isn't empty:
if(myEditText.getText != ""){
//then convert
//you should use edittext.text.tofloat
// because the default value in edittext is String
// and you can't convert string to float or int value
}

the receiver does not show the message. BroadcastReceiver

**Hello everyone, I'm new to programming. When I press the button, nothing happens, I can't find the error. Please see. On assignment, I need to create a message listener (Receiver) and send text data to it by clicking on a button. Show the received data in Toast. .xml file:
**
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="#string/btn_send_message"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
.kt file:
package kg.tutorialapp.homework_47
import android.content.Intent
import android.os.Bundle
import android.widget.Button
import androidx.appcompat.app.AppCompatActivity
class MainActivity : AppCompatActivity() {
private val myAction = "kg.tutorialapp.action.MESSAGE"
private val alarmMessage = "Hello world!"
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val button = findViewById<Button>(R.id.button)
button.setOnClickListener { sendMessage() }
}
private fun sendMessage() {
val intent = Intent()
intent.action = myAction
intent.putExtra("kg.tutorialapp.broadcast.MESSAGE", alarmMessage)
intent.addFlags(Intent.FLAG_INCLUDE_STOPPED_PACKAGES)
sendBroadcast(intent)
}
}
receiver file:
class Receiver : BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
Toast.makeText(context, "Новое сообщение: " + intent.getStringExtra("kg.tutorialapp.broadcast.MESSAGE"), Toast.LENGTH_LONG).show()
}
}
> manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="kg.tutorialapp.homework_47">
<application
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/Theme.Homework_47"
tools:ignore="AllowBackup">
<receiver
android:name=".Receiver"
android:enabled="true"
android:exported="true"
tools:ignore="ExportedReceiver">
<intent-filter>
<action android:name="kg.tutorialapp.action.MESSAGE"/>
</intent-filter>
</receiver>
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

Try removing android:permission="TODO" from your reciever's manifest declaration.
Refer here

Unable to display an image selected with ACTION_GET_CONTENT

I am trying to display an image selected from the gallery in a image view using ACTION_GET_CONTENT, but it is not working for some reason.
activity_main.xml :
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<ImageView
android:id="#+id/imgViewTakePhoto"
android:layout_width="270dp"
android:layout_height="400dp"
app:layout_constraintBottom_toTopOf="#+id/btnTakePhoto"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/btnTakePhoto"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add Image"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.754" />
</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.kt:
package com.example.fundamentals
import android.app.Activity
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
btnTakePhoto.setOnClickListener {
Intent(Intent.ACTION_GET_CONTENT).also {
it.type = "image/*"
startActivityForResult(it,0)
}
}
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if(requestCode == Activity.RESULT_OK && requestCode == 0){
val uri = data?.data
imgViewTakePhoto.setImageURI(uri)
}
}
}
AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.fundamentals">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
I am able to select the image from gallery but it is not being displayed in the image view i.e. imgViewTakePhoto .
I tried searching for answers here, some people said for Android 11 or higher, I have to add an external query to my manifest file but that did not worked either.
This was the query:
<queries>
<intent>
<action android:name="android.intent.action.GET_CONTENT" />
<data android:mimeType="image/*"/>
</intent>
</queries>
I don't think the version of Android is a problem here because I tried it again on Android 9, and it didn't work.

startActivityForResult has been deprecated in favour of newer and modern registerForActivityResult and ActivityResultContracts.
Therefore what you should rather be doing is firstly creating an ActivityResultLauncher like following :
private val getImage = registerForActivityResult(ActivityResultContracts.OpenDocument()) {
it?.let {
imgViewTakePhoto.setImageURI(it)
}
}
and then calling it inside your buttons on click like this :
btnTakePhoto.setOnClickListener {
getImage.launch(arrayOf("image/*"))
}
Note that registerForActivityResult is supposed to be initialised before your activity comes into context due to the actual callback registering process which is why it should be directly instantiated as a variable before onCreate is called. If that is not the case then launching the result launcher would throw some state related exception.
Following is the final code for your MainActivity:
class MainActivity : AppCompatActivity() {
private val getImage = registerForActivityResult(ActivityResultContracts.OpenDocument()) {
it?.let {
imgViewTakePhoto.setImageURI(it)
}
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
btnTakePhoto.setOnClickListener {
getImage.launch(arrayOf("image/*"))
}
}
}

Second activity not showing on real phone

My app works absolutely fine on the emulator. but when i get it to a real phone (tried on multiple: one plus 7t pro running android 10, Samsung M20 running android 10), the second activity doesnt launch at all.
I tried a simple app that just launches a second activity & nothing happens even in this. Im out of ideas on what to do!
Here is my main activity:
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.TextView
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
fun btnClick(view: View){
intent.setClass(this,ViewExpenseList::class.java)
intent.putExtra("Text",findViewById<TextView>(R.id.helloWorld).text.toString())
startActivityForResult(intent,1)
}
}
activity xml:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:id="#+id/helloWorld"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="159dp"
android:layout_marginTop="21dp"
android:layout_marginEnd="164dp"
android:layout_marginBottom="286dp"
android:onClick="btnClick"
android:text="Button"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/helloWorld" />
</androidx.constraintlayout.widget.ConstraintLayout>
My second activity:
package com.anand.expensetracker
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.TextView
class ViewExpenseList : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_view_expense_list)
findViewById<TextView>(R.id.textView).text=intent.getStringExtra("Text") +"asdfghj"
}
}
My android manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.anand.expensetracker"
android:versionCode="1"
android:versionName="#string/versionName">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".ViewExpenseList"></activity>
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

try change
intent.setClass(this,ViewExpenseList::class.java)
to
val intent = Intent(this, ViewExpenseList::class.java)

Do it like this below
fun btnClick(view: View){
//Get text from view
val myText = helloWorld.text.toString()
//Launch ViewExpenseList Activity
val intent = Intent(this,ViewExpenseList::class.java)
intent.putExtra("Text",myText)
startActivity(intent)
}