Dexter Library is used to easily access runtime permissions. As Marshmallow has provided the facility to grant permissions but still for granting each and every permission, the developer needs to write long and tedious codes. So, to overcome this, we use Dexter Library.
Below is an Easy Implementation of Dexter Library:
1. Add Dexter Permissions Library
(build.gradle(Module: app)
implementation 'com.karumi:dexter:5.0.0'
2. Add Permissions in Android Manifest File
< uses-permission android:name="android.permission.CAMERA" / >
< uses-permission android:name="android.permission.READ_CONTACTS" / >
< uses-permission android:name="android.permission.RECORD_AUDIO" / >
< uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
< uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
< uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
< uses-permission android:name="android.permission.CALL_PHONE" />3. Create XML File for Layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="DEXTER LIBRARY DEMO"
android:textAlignment="center"
android:textSize="20dp"
android:textColor="#ffffff"
android:background="#000000"/>
<Button
android:id="@+id/b1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="single permission"
android:layout_marginTop="50dp"
android:onClick="func1"/> // func1() is called when we click on “SINGLE PERMISSION” button.
<Button
android:id="@+id/b2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:text="multiple permissions"
android:onClick="multiplepermissions"/>// multiplepermissions() is called when we click on
“MULTIPLE PERMISSIONS” button
</LinearLayout>Read More: How to change the background transition in Android Studio
4. Create Java File (MAIN ACTIVITY.java)
package com.example.dexterlibrary;
import android.Manifest;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.provider.Settings;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import com.karumi.dexter.Dexter;
import com.karumi.dexter.MultiplePermissionsReport;
import com.karumi.dexter.PermissionToken;
import com.karumi.dexter.listener.DexterError;
import com.karumi.dexter.listener.PermissionDeniedResponse;
import com.karumi.dexter.listener.PermissionGrantedResponse;
import com.karumi.dexter.listener.PermissionRequest;
import com.karumi.dexter.listener.PermissionRequestErrorListener;
import com.karumi.dexter.listener.multi.MultiplePermissionsListener;
import com.karumi.dexter.listener.single.PermissionListener;
import java.util.List;public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}public void func1(View view)
{
singlePerm();
}
public void singlePerm()
{
Dexter.withActivity(this)
.withPermission(Manifest.permission.CAMERA)
.withListener(new PermissionListener() {
@Override
public void onPermissionGranted(PermissionGrantedResponse response) {
//Single Permission is granted
Toast.makeText(MainActivity.this, "Enable single permission", Toast.LENGTH_SHORT).show();
}
@Override
public void onPermissionDenied(PermissionDeniedResponse response) {
// check for permanent denial of permission
if (response.isPermanentlyDenied()) {
openSettingsDialog();
}
}
@Override
public void onPermissionRationaleShouldBeShown(PermissionRequest permission, PermissionToken token) {
token.continuePermissionRequest();
}
}).check();
}
public void openSettingsDialog()
{
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Permissions Required");
builder.setMessage("Permission is required for using this app. Please enable them in app settings.");
builder.setPositiveButton("Go to SETTINGS", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
showsettings();
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.show();
}
public void showsettings()
{
Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
Uri uri = Uri.fromParts("package", getPackageName(), null);
intent.setData(uri);
startActivityForResult(intent, 101);
}
public void multiplepermissions(View view)
{
Dexter.withActivity(this)
.withPermissions(
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE,
Manifest.permission.READ_CONTACTS,
Manifest.permission.RECORD_AUDIO,
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.CALL_PHONE,
Manifest.permission.CAMERA)
.withListener(new MultiplePermissionsListener() {
@Override
public void onPermissionsChecked(MultiplePermissionsReport report) {
// if all permissions are allowed
if (report.areAllPermissionsGranted()) {
Toast.makeText(getApplicationContext(), "All permissions are granted!", Toast.LENGTH_SHORT).show();
}
// if permanent denial of any permission
if (report.isAnyPermissionPermanentlyDenied())
{
openSettingsDialog();// show alert dialog box
}
}
@Override
public void onPermissionRationaleShouldBeShown(List permissions, PermissionToken token) {
token.continuePermissionRequest();
}
}).
withErrorListener(new PermissionRequestErrorListener() {
@Override
public void onError(DexterError error) {
Toast.makeText(getApplicationContext(), "Error!! ", Toast.LENGTH_SHORT).show();
}
})
.onSameThread()
.check();
}
}4.1 Granting Single Permission
- onPermissionGranted() will be called when the permission is granted.
- onPermissionDenied() will be called when the permission is rejected.
public void func1(View view)
{
singlePerm();
}
public void singlePerm()
{
Dexter.withActivity(this)
.withPermission(Manifest.permission.CAMERA)
.withListener(new PermissionListener() {
@Override
public void onPermissionGranted(PermissionGrantedResponse response) {
//Single Permission is granted
Toast.makeText(MainActivity.this, "Enable single permission", Toast.LENGTH_SHORT).show();
}
@Override
public void onPermissionDenied(PermissionDeniedResponse response) {
// check for permanent denial of permission
if (response.isPermanentlyDenied()) {
openSettingsDialog();
}
}
@Override
public void onPermissionRationaleShouldBeShown(PermissionRequest permission, PermissionToken token) {
token.continuePermissionRequest();
}
}).check();
}
public void openSettingsDialog()
{
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Permissions Required");
builder.setMessage("Permission is required for using this app. Please enable them in app settings.");
builder.setPositiveButton("Go to SETTINGS", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
showsettings();
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.show();
}
public void showsettings()
{
Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
Uri uri = Uri.fromParts("package", getPackageName(), null);
intent.setData(uri);
startActivityForResult(intent, 101);
}4.2 Granting Multiple Permissions
If you to multiple permission then, you can use withPermissions() method.
public void multiplepermissions(View view)
{
Dexter.withActivity(this)
.withPermissions(
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE,
Manifest.permission.READ_CONTACTS,
Manifest.permission.RECORD_AUDIO,
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.CALL_PHONE,
Manifest.permission.CAMERA)
.withListener(new MultiplePermissionsListener() {
@Override
public void onPermissionsChecked(MultiplePermissionsReport report) {
// if all permissions are allowed
if (report.areAllPermissionsGranted()) {
Toast.makeText(getApplicationContext(), "All permissions are granted!", Toast.LENGTH_SHORT).show();
}
// if permanent denial of any permission
if (report.isAnyPermissionPermanentlyDenied()) {
openSettingsDialog();// show alert dialog box
}
}
@Override
public void onPermissionRationaleShouldBeShown(List permissions, PermissionToken token) {
token.continuePermissionRequest();
}
}).
withErrorListener(new PermissionRequestErrorListener() {
@Override
public void onError(DexterError error) {
Toast.makeText(getApplicationContext(), "Error!! ", Toast.LENGTH_SHORT).show();
}
})
.onSameThread()
.check();
}
public void openSettingsDialog()
{
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Permissions Required");
builder.setMessage("Permission is required for using this app. Please enable them in app settings.");
builder.setPositiveButton("Go to SETTINGS", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
showsettings();
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.show();
}
public void showsettings()
{
Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
Uri uri = Uri.fromParts("package", getPackageName(), null);
intent.setData(uri);
startActivityForResult(intent, 101);
}