Below example asks for camera permission in versions greater than Android Marshmallow.
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Add Camera permission to the manifest
<uses-permission android:name="android.permission.CAMERA" /> |
For asking for permission you can call like this.
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, MY_PERMISSIONS_REQUEST_CAMERA); |
To Check if the user has permission to access camera.
if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {} |
Now the Callback if the User has performed any action.
@Overridepublic void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) { switch (requestCode) { case MY_PERMISSIONS_REQUEST_CAMERA: { Log.i("Camera", "G : " + grantResults[0]); // If request is cancelled, the result arrays are empty. if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) // permission was granted, openCamera(); } else { // permission denied, boo! Disable the // functionality that depends on this permission. if (ActivityCompat.shouldShowRequestPermissionRationale (this, Manifest.permission.CAMERA)) { showAlert(); } else { } } return; } // other 'case' lines to check for other // permissions this app might request }} |
if the user clicks “Never ask again” then check below function
It will return false if the user tapped “Never ask again”.
if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.CAMERA)) {} |
Here is the complete example.
package com.coderzheaven.camerademo;import android.Manifest;import android.app.Activity;import android.app.AlertDialog;import android.content.Context;import android.content.DialogInterface;import android.content.Intent;import android.content.SharedPreferences;import android.content.pm.PackageManager;import android.net.Uri;import android.os.Bundle;import android.provider.Settings;import android.support.v4.app.ActivityCompat;import android.support.v4.content.ContextCompat;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.Toolbar;public class MainActivity extends AppCompatActivity { public static final int MY_PERMISSIONS_REQUEST_CAMERA = 100; public static final String ALLOW_KEY = "ALLOWED"; public static final String CAMERA_PREF = "camera_pref"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) { if (getFromPref(this, ALLOW_KEY)) { showSettingsAlert(); } else if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) { // Should we show an explanation? if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.CAMERA)) { showAlert(); } else { // No explanation needed, we can request the permission. ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, MY_PERMISSIONS_REQUEST_CAMERA); } } } else { openCamera(); } } public static void saveToPreferences(Context context, String key, Boolean allowed) { SharedPreferences myPrefs = context.getSharedPreferences (CAMERA_PREF, Context.MODE_PRIVATE); SharedPreferences.Editor prefsEditor = myPrefs.edit(); prefsEditor.putBoolean(key, allowed); prefsEditor.commit(); } public static Boolean getFromPref(Context context, String key) { SharedPreferences myPrefs = context.getSharedPreferences (CAMERA_PREF, Context.MODE_PRIVATE); return (myPrefs.getBoolean(key, false)); } private void showAlert() { AlertDialog alertDialog = new AlertDialog.Builder(this).create(); alertDialog.setTitle("Alert"); alertDialog.setMessage("App needs to access the Camera."); alertDialog.setButton(AlertDialog.BUTTON_NEGATIVE, "DONT ALLOW", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); finish(); } }); alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "ALLOW", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CAMERA}, MY_PERMISSIONS_REQUEST_CAMERA); } }); alertDialog.show(); } private void showSettingsAlert() { AlertDialog alertDialog = new AlertDialog.Builder(this).create(); alertDialog.setTitle("Alert"); alertDialog.setMessage("App needs to access the Camera."); alertDialog.setButton(AlertDialog.BUTTON_NEGATIVE, "DONT ALLOW", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); //finish(); } }); alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "SETTINGS", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); startInstalledAppDetailsActivity(MainActivity.this); } }); alertDialog.show(); } @Override public void onRequestPermissionsResult (int requestCode, String permissions[], int[] grantResults) { switch (requestCode) { case MY_PERMISSIONS_REQUEST_CAMERA: { for (int i = 0, len = permissions.length; i < len; i++) { String permission = permissions[i]; if (grantResults[i] == PackageManager.PERMISSION_DENIED) { boolean showRationale = ActivityCompat.shouldShowRequestPermissionRationale (this, permission); if (showRationale) { showAlert(); } else if (!showRationale) { // user denied flagging NEVER ASK AGAIN // you can either enable some fall back, // disable features of your app // or open another dialog explaining // again the permission and directing to // the app setting saveToPreferences(MainActivity.this, ALLOW_KEY, true); } } } } // other 'case' lines to check for other // permissions this app might request } } public static void startInstalledAppDetailsActivity(final Activity context) { if (context == null) { return; } final Intent i = new Intent(); i.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS); i.addCategory(Intent.CATEGORY_DEFAULT); i.setData(Uri.parse("package:" + context.getPackageName())); i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); i.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY); i.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS); context.startActivity(i); } private void openCamera() { Intent intent = new Intent("android.media.action.IMAGE_CAPTURE"); startActivity(intent); }} |
