I am doing an application to scan barcodes on a button click and it was working fine up to Lollipop versions. When I came to Marshmallow it stopped working. This is the error:
camerabase an error occurred while connecting to camera 0
It forces me to turn on permission by:
Settings --> application --> my app --> camera.
My question is how to allow camera permission to my app automatically in Marshmallow or by asking the user to turn on camera at runtime. A screen shot:
Below I have written a code for granting a runtime permissions for Camera, There is an Array of String in which you can give multiple requests granting as which is needed at runtime.
public class MainActivity extends AppCompatActivity {
private static final int PERMISSION_REQUEST_CODE = 200;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (checkPermission()) {
//main logic or main code
// . write your main code to execute, It will execute if the permission is already given.
} else {
requestPermission();
}
}
private boolean checkPermission() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
!= PackageManager.PERMISSION_GRANTED) {
// Permission is not granted
return false;
}
return true;
}
private void requestPermission() {
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.CAMERA},
PERMISSION_REQUEST_CODE);
}
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
switch (requestCode) {
case PERMISSION_REQUEST_CODE:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(getApplicationContext(), "Permission Granted", Toast.LENGTH_SHORT).show();
// main logic
} else {
Toast.makeText(getApplicationContext(), "Permission Denied", Toast.LENGTH_SHORT).show();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
!= PackageManager.PERMISSION_GRANTED) {
showMessageOKCancel("You need to allow access permissions",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
requestPermission();
}
}
});
}
}
}
break;
}
}
private void showMessageOKCancel(String message, DialogInterface.OnClickListener okListener) {
new AlertDialog.Builder(MainActivity.this)
.setMessage(message)
.setPositiveButton("OK", okListener)
.setNegativeButton("Cancel", null)
.create()
.show();
}
}
This is the complete code to implement multiple or single runtime permissions
Step 1
Add permission in
manifestfor camera and also other required permissions
like
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
Step 2
declare this variable
public static final int REQUEST_ID_MULTIPLE_PERMISSIONS= 7;
and Call this method checkAndroidVersion() in oncreate()
private void checkAndroidVersion() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
checkAndRequestPermissions();
} else {
// code for lollipop and pre-lollipop devices
}
}
private boolean checkAndRequestPermissions() {
int camera = ContextCompat.checkSelfPermission(getActivity(),
Manifest.permission.CAMERA);
int wtite = ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.WRITE_EXTERNAL_STORAGE);
int read = ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.READ_EXTERNAL_STORAGE);
List<String> listPermissionsNeeded = new ArrayList<>();
if (wtite != PackageManager.PERMISSION_GRANTED) {
listPermissionsNeeded.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
}
if (camera != PackageManager.PERMISSION_GRANTED) {
listPermissionsNeeded.add(Manifest.permission.CAMERA);
}
if (read != PackageManager.PERMISSION_GRANTED) {
listPermissionsNeeded.add(Manifest.permission.READ_EXTERNAL_STORAGE);
}
if (!listPermissionsNeeded.isEmpty()) {
ActivityCompat.requestPermissions(getActivity(), listPermissionsNeeded.toArray(new String[listPermissionsNeeded.size()]), REQUEST_ID_MULTIPLE_PERMISSIONS);
return false;
}
return true;
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
Log.d("in fragment on request", "Permission callback called-------");
switch (requestCode) {
case REQUEST_ID_MULTIPLE_PERMISSIONS: {
Map<String, Integer> perms = new HashMap<>();
// Initialize the map with both permissions
perms.put(Manifest.permission.WRITE_EXTERNAL_STORAGE, PackageManager.PERMISSION_GRANTED);
perms.put(Manifest.permission.CAMERA, PackageManager.PERMISSION_GRANTED);
perms.put(Manifest.permission.READ_EXTERNAL_STORAGE, PackageManager.PERMISSION_GRANTED);
// Fill with actual results from user
if (grantResults.length > 0) {
for (int i = 0; i < permissions.length; i++)
perms.put(permissions[i], grantResults[i]);
// Check for both permissions
if (perms.get(Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED
&& perms.get(Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED && perms.get(Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
Log.d("in fragment on request", "CAMERA & WRITE_EXTERNAL_STORAGE READ_EXTERNAL_STORAGE permission granted");
// process the normal flow
//else any one or both the permissions are not granted
} else {
Log.d("in fragment on request", "Some permissions are not granted ask again ");
//permission is denied (this is the first time, when "never ask again" is not checked) so ask again explaining the usage of permission
// // shouldShowRequestPermissionRationale will return true
//show the dialog or snackbar saying its necessary and try again otherwise proceed with setup.
if (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(), Manifest.permission.WRITE_EXTERNAL_STORAGE) || ActivityCompat.shouldShowRequestPermissionRationale(getActivity(), Manifest.permission.CAMERA) || ActivityCompat.shouldShowRequestPermissionRationale(getActivity(), Manifest.permission.READ_EXTERNAL_STORAGE)) {
showDialogOK("Camera and Storage Permission required for this app",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
switch (which) {
case DialogInterface.BUTTON_POSITIVE:
checkAndRequestPermissions();
break;
case DialogInterface.BUTTON_NEGATIVE:
// proceed with logic by disabling the related features or quit the app.
break;
}
}
});
}
//permission is denied (and never ask again is checked)
//shouldShowRequestPermissionRationale will return false
else {
Toast.makeText(getActivity(), "Go to settings and enable permissions", Toast.LENGTH_LONG)
.show();
// //proceed with logic by disabling the related features or quit the app.
}
}
}
}
}
}
private void showDialogOK(String message, DialogInterface.OnClickListener okListener) {
new AlertDialog.Builder(getActivity())
.setMessage(message)
.setPositiveButton("OK", okListener)
.setNegativeButton("Cancel", okListener)
.create()
.show();
}
if (ContextCompat.checkSelfPermission(getContext(),
Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale((Activity)
getContext(), Manifest.permission.CAMERA)) {
} else {
ActivityCompat.requestPermissions((Activity) getContext(),
new String[]{Manifest.permission.CAMERA},
MY_PERMISSIONS_REQUEST_CAMERA);
}
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
registerStoragePermission()
registerGalleryLauncher()
registerCameraPermission()
registerCameraLauncher()
}
private fun registerCameraPermission() {
requestCameraPermissionLauncher =
registerForActivityResult(ActivityResultContracts.RequestPermission()) { granted ->
if (granted) {
Log.d(TAG, "registerCameraPermission - Camera Permission Granted")
openCamera()
} else {
Log.d(TAG, "registerCameraPermission - Camera Permission NOT Granted")
requestCameraPermission()
}
}
}
private fun registerStoragePermission() {
requestStoragePermissionLauncher =
registerForActivityResult(ActivityResultContracts.RequestPermission()) { granted ->
if (granted) {
Log.d(TAG, "registerStoragePermission - Storage Permission Granted")
viewGallery()
} else {
Log.d(TAG, "registerStoragePermission - Storage Permission NOT Granted")
requestStoragePermission()
}
}
}
private fun registerCameraLauncher() {
cameraLauncher =
registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
if (result.resultCode == Activity.RESULT_OK) {
val data: Intent? = result.data
if (data == null) {
return@registerForActivityResult
}
val extras = data.extras
imageBitmap = extras!!["data"] as Bitmap
file = FileUtils.createFile(requireContext(),
getString(R.string.app_name),
"my_profile_image.png"
)
//FileUtils.saveBitmap(imageBitmap, file);
val imageLocalPath = FileUtils.saveImageToInternalStorage(file, imageBitmap)
SharedPreferencesUtils.setProfilePath(requireActivity(), imageLocalPath)
profileFragmentBinding.imageViewCircleNoStroke.setImageBitmap(imageBitmap)
profileFragmentBinding.imageViewCircleNoStroke.setScaleType(ImageView.ScaleType.CENTER_CROP)
}
}
}
private fun registerGalleryLauncher() {
galleryLauncher =
registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
if (result.resultCode == Activity.RESULT_OK) {
val data: Intent? = result.data
if (data == null) {
return@registerForActivityResult
}
val uri = data.data
var imageLocalPath = File(FileUtils.getPathReal(requireActivity(), uri!!))
file = imageLocalPath.absoluteFile
SharedPreferencesUtils.setProfilePath(requireActivity(), imageLocalPath.absolutePath)
Glide.with(requireActivity()).load(uri)
.into(profileFragmentBinding.imageViewCircleNoStroke)
profileFragmentBinding.imageViewCircleNoStroke.setScaleType(ImageView.ScaleType.CENTER_CROP)
}
}
}
private fun showImageUploadOptions() {
val mDialog = activity.let { Dialog(it!!) }
mDialog.requestWindowFeature(Window.FEATURE_NO_TITLE)
mDialog.setContentView(R.layout.dialog_profile_image_option)
mDialog.window!!.setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))
//val mAlertMessageTv = mDialog.findViewById<View>(R.id.id_alert_tv) as TextView
//mAlertMessageTv.text = message
galleryLl = mDialog.findViewById<View>(R.id.id_gallery_ll) as LinearLayout
cameraLl = mDialog.findViewById<View>(R.id.id_camera_ll) as LinearLayout
removePhotoLl = mDialog.findViewById<View>(R.id.id_remove_photo_ll) as LinearLayout
galleryLl.setOnClickListener {
CallStoragePermission()
mDialog.dismiss()
}
cameraLl.setOnClickListener {
CallCameraPermission()
mDialog.dismiss()
}
removePhotoLl.setOnClickListener {
CallRemovePhoto()
mDialog.dismiss()
}
mDialog.setCancelable(true)
mDialog.show()
val metrics = resources.displayMetrics
val width = metrics.widthPixels
val height = metrics.heightPixels
mDialog.window!!.setLayout(
width,
LinearLayout.LayoutParams.WRAP_CONTENT
)
}
fun CallStoragePermission() {
if (!Status_checkReadExternalStoragePermission()) {
requestStoragePermissionLauncher.launch(Manifest.permission.READ_EXTERNAL_STORAGE)
} else {
viewGallery()
}
}
private fun Status_checkReadExternalStoragePermission(): Boolean {
val permissionState = ActivityCompat.checkSelfPermission(
requireActivity(),
Manifest.permission.READ_EXTERNAL_STORAGE
)
return permissionState == PackageManager.PERMISSION_GRANTED
}
private fun requestCameraPermission() {
when {
ContextCompat.checkSelfPermission(
requireContext(),
Manifest.permission.CAMERA
) == PackageManager.PERMISSION_GRANTED -> {
Log.d(TAG, "requestCameraPermission - Camera Permission Granted")
openCamera()
// The permission is granted
// you can go with the flow that requires permission here
}
shouldShowRequestPermissionRationale(Manifest.permission.CAMERA) -> {
// This case means user previously denied the permission
// So here we can display an explanation to the user
// That why exactly we need this permission
Log.d(TAG, "requestCameraPermission - Camera Permission NOT Granted")
showPermissionAlert(
getString(R.string.camera_permission),
getString(R.string.camera_permission_denied),
getString(R.string.ok_caps),
getString(R.string.cancel_caps)
) { requestCameraPermissionLauncher.launch(Manifest.permission.CAMERA) }
}
else -> {
// Everything is fine you can simply request the permission
showPermissionAlert(
getString(R.string.camera_permission),
getString(R.string.camera_permission_denied),
getString(R.string.settings_caps),
getString(R.string.cancel_caps)
) {
val intent = Intent()
intent.action = Settings.ACTION_APPLICATION_DETAILS_SETTINGS
val uri = Uri.fromParts(
"package",
BuildConfig.APPLICATION_ID, null
)
intent.data = uri
intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
startActivity(intent)
}
}
}
}
private fun requestStoragePermission() {
when {
ContextCompat.checkSelfPermission(
requireContext(),
Manifest.permission.READ_EXTERNAL_STORAGE
) == PackageManager.PERMISSION_GRANTED -> {
Log.d(TAG, "requestStoragePermission - Storage Permission Granted")
viewGallery()
// The permission is granted
// you can go with the flow that requires permission here
}
shouldShowRequestPermissionRationale(Manifest.permission.READ_EXTERNAL_STORAGE) -> {
// This case means user previously denied the permission
// So here we can display an explanation to the user
// That why exactly we need this permission
Log.d(TAG, "requestStoragePermission - Storage Permission NOT Granted")
showPermissionAlert(
getString(R.string.read_storage_permission_required),
getString(R.string.storage_permission_denied),
getString(R.string.ok_caps),
getString(R.string.cancel_caps)
) { requestStoragePermissionLauncher.launch(Manifest.permission.READ_EXTERNAL_STORAGE) }
}
else -> {
// Everything is fine you can simply request the permission
showPermissionAlert(
getString(R.string.read_storage_permission_required),
getString(R.string.storage_permission_denied),
getString(R.string.settings_caps),
getString(R.string.cancel_caps)
) {
val intent = Intent()
intent.action = Settings.ACTION_APPLICATION_DETAILS_SETTINGS
val uri = Uri.fromParts(
"package",
BuildConfig.APPLICATION_ID, null
)
intent.data = uri
intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
startActivity(intent)
}
}
}
}
private fun showPermissionAlert(
title: String,
message: String,
ok: String,
cancel: String,
function: () -> Unit
) {
val mDialog = requireActivity().let { Dialog(it) }
mDialog.requestWindowFeature(Window.FEATURE_NO_TITLE)
mDialog.setContentView(R.layout.dialog_permission_alert)
mDialog.window!!.setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))
val mTitleTv = mDialog.findViewById<View>(R.id.id_title_tv) as AppCompatTextView
mTitleTv.text = title
val mMessageTv = mDialog.findViewById<View>(R.id.id_message_tv) as AppCompatTextView
mMessageTv.text = message
val mNoBtn = mDialog.findViewById<View>(R.id.no_btn) as AppCompatTextView
mNoBtn.text = cancel
val mYesBtn = mDialog.findViewById<View>(R.id.yes_btn) as AppCompatTextView
mYesBtn.text = ok
mYesBtn.setOnClickListener {
function.invoke()
mDialog.dismiss()
}
mNoBtn.setOnClickListener { mDialog.dismiss() }
mDialog.setCancelable(true)
mDialog.show()
val metrics = resources.displayMetrics
val width = metrics.widthPixels
val height = metrics.heightPixels
mDialog.window!!.setLayout(
width,
LinearLayout.LayoutParams.WRAP_CONTENT
)
}
fun viewGallery() {
val intentDocument = Intent(Intent.ACTION_GET_CONTENT)
intentDocument.type = "image/*"
intentDocument.putExtra(
Constants.REQUEST_CODE,
Constants.REQUEST_PHOTO_FROM_GALLERY
)
galleryLauncher.launch(intentDocument)
}
fun openCamera() {
val takePictureIntent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
takePictureIntent.putExtra(
Constants.REQUEST_CODE,
Constants.REQUEST_PERMISSIONS_REQUEST_CODE_CAMERA
)
cameraLauncher.launch(takePictureIntent)
}
fun CallCameraPermission() {
if (!Status_checkCameraPermission()) {
requestCameraPermissionLauncher.launch(Manifest.permission.CAMERA)
} else {
openCamera()
}
}
private fun Status_checkCameraPermission(): Boolean {
val camera = ActivityCompat.checkSelfPermission(
requireActivity(),
Manifest.permission.CAMERA
)
return camera == PackageManager.PERMISSION_GRANTED
}
RxPermission is best library for asking permissions from user.
For camera permission the workaround is like this.
1) First add these permissions (or one you need) in your manifest.xml.
<uses-permission android:name="android.permission.CAMERA" />
2) Then ask run time permission from user in your activity.
RxPermissions rxPermissions = new RxPermissions(this);
rxPermissions
.request(Manifest.permission.CAMERA) // ask single or multiple permission once
.subscribe(granted -> {
if (granted) {
// All requested permissions are granted
} else {
// At least one permission is denied
}
});
add this library in your build.gradle
allprojects {
repositories {
...
maven { url 'https://jitpack.io' }
}
}
dependencies {
implementation 'com.github.tbruyelle:rxpermissions:0.10.1'
implementation 'com.jakewharton.rxbinding2:rxbinding:2.1.1'
}
Isn't this easy?
Manifest.xml
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CAMERA" />
Call it somewhere in your activity:
handlePermissions(new String[]{
Manifest.permission.WRITE_EXTERNAL_STORAGE,
Manifest.permission.CAMERA
});
Also in your activity:
private void handlePermissions(String[] permissions) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
ArrayList<String> notGrantedPerms = new ArrayList<>();
for (String p : permissions) {
if (this.checkSelfPermission(p) != PackageManager.PERMISSION_GRANTED)
notGrantedPerms.add(p);
}
permissions = notGrantedPerms.toArray(new String[0]);
if (permissions != null && permissions.length > 0)
this.requestPermissions(permissions, 701);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 701) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
for (String p : permissions) {
String msg = "";
if (this.checkSelfPermission(p) == PackageManager.PERMISSION_GRANTED)
msg = "Permission Granted for " + p;
else
msg = "Permission not Granted for " + p;
Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
}
}
}
}
void AutoRequestAllPermissions(){
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M){return;}
PackageInfo info = null;
try {
info = getPackageManager().getPackageInfo(getApplicationContext().getPackageName(), PackageManager.GET_PERMISSIONS);
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
}
if(info==null){return;}
String[] permissions = info.requestedPermissions;
boolean remained = false;
for (String permission : permissions) {
if (checkSelfPermission(permission) != PackageManager.PERMISSION_GRANTED) {
remained = true;
}
}
if(remained) {
requestPermissions(permissions, 0);
}
}
this code-
This might help:
if (ContextCompat.checkSelfPermission(context, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED)
{
if(ActivityCompat.shouldShowRequestPermissionRationale((Activity) context, Manifest.permission.CAMERA))
{
AlertDialog.Builder alertBuilder = new AlertDialog.Builder(context);
alertBuilder.setCancelable(true);
alertBuilder.setTitle("Permission necessary");
alertBuilder.setMessage("CAMERA is necessary");
alertBuilder.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public void onClick(DialogInterface dialog, int which) {
ActivityCompat.requestPermissions((Activity) context,
new String[]{Manifest.permission.CAMERA}, MY_PERMISSIONS_REQUESTS);
}
});
AlertDialog alert = alertBuilder.create();
alert.show();
} else {
ActivityCompat.requestPermissions((Activity) context, new String[]{Manifest.permission.CAMERA}, MY_PERMISSIONS_REQUESTS);
}
return false;
} else {
return true;
}
Where MY_PERMISSIONS_REQUESTS is your final value of the request code.
It works just fine for me.
After having it defined in your manifest file, a friendlier alternative to the native solution would be using Aaper: https://github.com/LikeTheSalad/aaper like so:
@EnsurePermissions(permissions = [Manifest.permission.CAMERA])
private fun takePhoto() {
// Your code that needs the camera permission granted.
}
Disclaimer, I'm the creator of Aaper.
Android team has provided a new way in requesting permissions using registerForActivityResult,
<uses-permission
android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
Define an object to request permissions, and receive the result in the
callback
private val requestPermissionsLauncher =
registerForActivityResult(ActivityResultContracts.RequestMultiplePermissions()) { permissions ->
if (permissions.all { it.value }) {
Toast.makeText(
this,
"You have obtained the required permissions",
Toast.LENGTH_LONG
).show()
} else Toast.makeText(
this,
"You have not accepted all the permissions",
Toast.LENGTH_LONG
).show()
}
To ask for the permissions, do the following, you can add wherever you think is better:
requestPermissionsLauncher.launch(
arrayOf(
Manifest.permission.CAMERA,
Manifest.permission.WRITE_EXTERNAL_STORAGE
)
)
Try my code -
<!-- add permissions to the manifest file -->
<uses-permission android:name="android.permission.CAMERA" />
MainActivity -
package com.company0ne.multiplepermissionkotlin
import android.Manifest
import android.content.pm.PackageManager
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.activity.result.ActivityResultLauncher
import androidx.activity.result.contract.ActivityResultContracts
import androidx.core.content.ContextCompat
class MainActivity : AppCompatActivity() {
private lateinit var permissionLauncher: ActivityResultLauncher<Array<String>>
`enter code here`private var isCameraPermissionGranted = false
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
//Request Multiple Permissions
permissionLauncher =
registerForActivityResult(ActivityResultContracts.RequestMultiplePermissions()) { permissions ->
isCameraPermissionGranted =
permissions[Manifest.permission.CAMERA] ?: isCameraPermissionGranted
}
requestPermission()
}
private fun requestPermission() {
//read camera permission from Manifest file
isCameraPermissionGranted = ContextCompat.checkSelfPermission(
this,
Manifest.permission.CAMERA
) == PackageManager.PERMISSION_GRANTED
//if request is not null then it will ask for permissions
val permissionRequest: MutableList<String> = ArrayList()
if (!isCameraPermissionGranted) {
permissionRequest.add(Manifest.permission.CAMERA)
}
if (permissionRequest.isNotEmpty()) {
permissionLauncher.launch(permissionRequest.toTypedArray())
}
}
}
