How to Run an if Else Again in Java
Starting from Android six.0 (API 23), users are non asked for permissions at the time of installation rather developers need to request the permissions at the run time. Simply the permissions that are divers in the manifest file tin can be requested at run time.
Types of Permissions
1. Install-Fourth dimension Permissions: If the Android 5.i.1 (API 22) or lower, the permission is requested at the installation fourth dimension at the Google Play Shop.
If the user Accepts the permissions, the app is installed. Else the app installation is canceled.
2. Run-Time Permissions: If the Android half dozen (API 23) or college, the permission is requested at the run time during the running of the app.
If the user Accepts the permissions, then that feature of the app can be used. Else to utilize the characteristic, the app requests permission again.
So, now the permissions are requested at runtime. In this article, we will talk over how to request permissions in an Android Application at run time.
Steps for Requesting permissions at run fourth dimension
Step ane: Declare the permission in the Android Manifest file : In Android, permissions are declared in the AndroidManifest.xml file using the uses-permission tag.
<uses-permission android:name="android.permission.PERMISSION_NAME"/>
Here we are declaring storage and camera permission.
XML
< uses-permission android:name = "android.permission.READ_EXTERNAL_STORAGE" />
< uses-permission android:proper noun = "android.permission.WRITE_EXTERNAL_STORAGE" />
< uses-permission android:proper name = "android.permission.Photographic camera" />
Pace two: Modify activity_main.xml file to Add together two buttons to request permission on button click: Permission will be checked and requested on button click. Open the activity_main.xml file and add two buttons to information technology.
XML
< Button
android:id = "@+id/storage"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:text = "Storage"
android:layout_marginTop = "16dp"
android:padding = "8dp"
android:layout_below = "@id/toolbar"
android:layout_centerHorizontal = "true" />
< Push button
android:id = "@+id/camera"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:text = "Camera"
android:layout_marginTop = "16dp"
android:padding = "8dp"
android:layout_below = "@id/storage"
android:layout_centerHorizontal = "truthful" />
Step 3: Check whether permission is already granted or not. If permission isn't already granted, asking the user for the permission: In order to use any service or feature, the permissions are required. Hence we have to ensure that the permissions are given for that. If non, and then the permissions are requested.
Check for permissions: Kickoff with Android six.0 (API level 23), the user has the right to revoke permissions from any app at whatsoever time, fifty-fifty if the app targets a lower API level. So to use the service, the app needs to check for permissions every time.
Syntax:
if(ContextCompat.checkSelfPermission(thisActivity, Manifest.permission.WRITE_CALENDAR) != PackageManager.PERMISSION_GRANTED) { // Permission is not granted } Asking Permissions: When PERMISSION_DENIED is returned from the checkSelfPermission() method in the to a higher place syntax, we need to prompt the user for that permission. Android provides several methods that can be used to request permission, such as requestPermissions().
Syntax:
ActivityCompat.requestPermissions(MainActivity.this, permissionArray, requestCode); Here permissionArray is an array of type String.
Example:
Java
public void checkPermission(String permission, int requestCode)
{
if (ContextCompat.checkSelfPermission(MainActivity. this , permission) == PackageManager.PERMISSION_DENIED) {
ActivityCompat.requestPermissions(MainActivity. this , new String[] { permission }, requestCode);
}
else {
Toast.makeText(MainActivity. this , "Permission already granted" , Toast.LENGTH_SHORT).evidence();
}
}
Kotlin
private fun checkPermission(permission: String, requestCode: Int) {
if (ContextCompat.checkSelfPermission( this @MainActivity , permission) == PackageManager.PERMISSION_DENIED) {
ActivityCompat.requestPermissions( this @MainActivity , arrayOf(permission), requestCode)
} else {
Toast.makeText( this @MainActivity , "Permission already granted" , Toast.LENGTH_SHORT).evidence()
}
}
This function will show a Toast message if permission is already granted otherwise prompt the user for permission.
Step 4: Override onRequestPermissionsResult() method: onRequestPermissionsResult() is chosen when user grant or turn down the permission. RequestCode is one of the parameters of this part which is used to check user action for the corresponding requests. Here a toast bulletin is shown indicating the permission and user action.
Example:
Coffee
@Override
public void onRequestPermissionsResult( int requestCode,
@NonNull String[] permissions,
@NonNull int [] grantResults)
{
super .onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == CAMERA_PERMISSION_CODE) {
if (grantResults.length > 0 && grantResults[ 0 ] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(MainActivity. this , "Camera Permission Granted" , Toast.LENGTH_SHORT).show();
}
else {
Toast.makeText(MainActivity. this , "Camera Permission Denied" , Toast.LENGTH_SHORT).show();
}
}
else if (requestCode == STORAGE_PERMISSION_CODE) {
if (grantResults.length > 0
&& grantResults[ 0 ] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(MainActivity. this , "Storage Permission Granted" , Toast.LENGTH_SHORT).show();
}
else {
Toast.makeText(MainActivity. this , "Storage Permission Denied" , Toast.LENGTH_SHORT).show();
}
}
}
Kotlin
override fun onRequestPermissionsResult(requestCode: Int,
permissions: Array<Cord>,
grantResults: IntArray) {
super .onRequestPermissionsResult(requestCode, permissions, grantResults)
if (requestCode == CAMERA_PERMISSION_CODE) {
if (grantResults.isNotEmpty() && grantResults[ 0 ] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText( this @MainActivity , "Camera Permission Granted" , Toast.LENGTH_SHORT).show()
} else {
Toast.makeText( this @MainActivity , "Camera Permission Denied" , Toast.LENGTH_SHORT).bear witness()
}
} else if (requestCode == STORAGE_PERMISSION_CODE) {
if (grantResults.isNotEmpty() && grantResults[ 0 ] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText( this @MainActivity , "Storage Permission Granted" , Toast.LENGTH_SHORT).show()
} else {
Toast.makeText( this @MainActivity , "Storage Permission Denied" , Toast.LENGTH_SHORT).show()
}
}
}
Below is the complete code of this application:
Beneath is the code for the activity_main.xml file.
XML
<? xml version = "i.0" encoding = "utf-8" ?>
< RelativeLayout
android:layout_width = "match_parent"
android:layout_height = "match_parent"
tools:context = ".MainActivity" >
< android.support.v7.widget.Toolbar
android:id = "@+id/toolbar"
android:layout_width = "match_parent"
android:groundwork = "@colour/colorPrimary"
app:championship = "GFG | Permission Example"
app:titleTextColor = "@android:color/white"
android:layout_height = "?android:attr/actionBarSize" />
< Button
android:id = "@+id/storage"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:text = "Storage"
android:layout_marginTop = "16dp"
android:padding = "8dp"
android:layout_below = "@id/toolbar"
android:layout_centerHorizontal = "truthful" />
< Push
android:id = "@+id/camera"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:text = "Photographic camera"
android:layout_marginTop = "16dp"
android:padding = "8dp"
android:layout_below = "@id/storage"
android:layout_centerHorizontal = "true" />
</ RelativeLayout >
Below is the code for the AndroidManifest.xml file.
XML
<? xml version = "1.0" encoding = "utf-8" ?>
package = "org.geeksforgeeks.requestPermission" >
< uses-permission android:name = "android.permission.READ_EXTERNAL_STORAGE" />
< uses-permission android:name = "android.permission.WRITE_EXTERNAL_STORAGE" />
< uses-permission android:name = "android.permission.CAMERA" />
< application
android:allowBackup = "truthful"
android:icon = "@mipmap/ic_launcher"
android:label = "@string/app_name"
android:roundIcon = "@mipmap/ic_launcher_round"
android:supportsRtl = "truthful"
android:theme = "@style/AppTheme" >
< activity
android:proper noun = ".MainActivity" >
< intent-filter >
< activity
android:name = "android.intent.action.MAIN" />
< category
android:name = "android.intent.category.LAUNCHER" />
</ intent-filter >
</ activity >
</ application >
</ manifest >
Beneath is the lawmaking for the MainActivity file.
Kotlin
import android.Manifest
import android.content.pm.PackageManager
import android.bone.Package
import android.widget.Button
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
grade MainActivity : AppCompatActivity() {
companion object {
private const val CAMERA_PERMISSION_CODE = 100
private const val STORAGE_PERMISSION_CODE = 101
}
override fun onCreate(savedInstanceState: Bundle?) {
super .onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val storage: Push? = findViewById(R.id.storage)
val camera: Push? = findViewById(R.id.camera)
storage?.setOnClickListener {checkPermission(
Manifest.permission.WRITE_EXTERNAL_STORAGE,
STORAGE_PERMISSION_CODE)
}
camera?.setOnClickListener {
checkPermission(Manifest.permission.Photographic camera,
CAMERA_PERMISSION_CODE)
}
}
private fun checkPermission(permission: String, requestCode: Int) {
if (ContextCompat.checkSelfPermission( this @MainActivity , permission) == PackageManager.PERMISSION_DENIED) {
ActivityCompat.requestPermissions( this @MainActivity , arrayOf(permission), requestCode)
} else {
Toast.makeText( this @MainActivity , "Permission already granted" , Toast.LENGTH_SHORT).show()
}
}
override fun onRequestPermissionsResult(requestCode: Int,
permissions: Array<Cord>,
grantResults: IntArray) {
super .onRequestPermissionsResult(requestCode, permissions, grantResults)
if (requestCode == CAMERA_PERMISSION_CODE) {
if (grantResults.isNotEmpty() && grantResults[ 0 ] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText( this @MainActivity , "Camera Permission Granted" , Toast.LENGTH_SHORT).show()
} else {
Toast.makeText( this @MainActivity , "Photographic camera Permission Denied" , Toast.LENGTH_SHORT).show()
}
} else if (requestCode == STORAGE_PERMISSION_CODE) {
if (grantResults.isNotEmpty() && grantResults[ 0 ] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText( this @MainActivity , "Storage Permission Granted" , Toast.LENGTH_SHORT).show()
} else {
Toast.makeText( this @MainActivity , "Storage Permission Denied" , Toast.LENGTH_SHORT).show()
}
}
}
}
Java
import android.Manifest;
import android.content.pm.PackageManager;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.back up.v4.content.ContextCompat;
import android.back up.v7.app.AppCompatActivity;
import android.os.Parcel;
import android.view.View;
import android.widget.Push;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
private Push button storage, camera;
individual static last int CAMERA_PERMISSION_CODE = 100 ;
private static concluding int STORAGE_PERMISSION_CODE = 101 ;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super .onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
storage = findViewById(R.id.storage);
camera = findViewById(R.id.camera);
storage.setOnClickListener( new View.OnClickListener() {
@Override
public void onClick(View five)
{
checkPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE, STORAGE_PERMISSION_CODE);
}
});
photographic camera.setOnClickListener( new View.OnClickListener() {
@Override
public void onClick(View v)
{
checkPermission(Manifest.permission.Camera, CAMERA_PERMISSION_CODE);
}
});
}
public void checkPermission(Cord permission, int requestCode)
{
if (ContextCompat.checkSelfPermission(MainActivity. this , permission) == PackageManager.PERMISSION_DENIED) {
ActivityCompat.requestPermissions(MainActivity. this , new String[] { permission }, requestCode);
}
else {
Toast.makeText(MainActivity. this , "Permission already granted" , Toast.LENGTH_SHORT).testify();
}
}
@Override
public void onRequestPermissionsResult( int requestCode,
@NonNull Cord[] permissions,
@NonNull int [] grantResults)
{
super .onRequestPermissionsResult(requestCode,
permissions,
grantResults);
if (requestCode == CAMERA_PERMISSION_CODE) {
if (grantResults.length > 0 && grantResults[ 0 ] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(MainActivity. this , "Camera Permission Granted" , Toast.LENGTH_SHORT) .show();
}
else {
Toast.makeText(MainActivity. this , "Camera Permission Denied" , Toast.LENGTH_SHORT) .show();
}
}
else if (requestCode == STORAGE_PERMISSION_CODE) {
if (grantResults.length > 0
&& grantResults[ 0 ] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(MainActivity. this , "Storage Permission Granted" , Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(MainActivity. this , "Storage Permission Denied" , Toast.LENGTH_SHORT).evidence();
}
}
}
}
Output:
On starting the awarding:
On clicking the photographic camera push button for the first time:
On Granting the permission:
On clicking the camera push button again:
Source: https://www.geeksforgeeks.org/android-how-to-request-permissions-in-android-application/
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