As we have already discussed about Requesting Runtime Permission in Marshmallow, now what if we want to give suuport for Runtime Permission in Pre-Marshmallow devices.
And the solution is : Support Library
If we want to use checkSelfPermission() we need to use minSdkVersion 23 but what if we want to give support in both Marshmallow and pre-marshmallow devices. There are small changes we need to do with those methods we are using for Marshmallow.
– ContextCompat.checkSelfPermission()
No matter application is run on Marshmallow or not. This function will correctly return PERMISSION_GRANTED if the permission is granted. Otherwise PERMISSION_DENIED will be returned.
– ActivityCompat.requestPermissions()
If this function is called on pre-Marshmallow, OnRequestPermissionsResultCallback will be suddenly called with correct PERMISSION_GRANTED or PERMISSION_DENIED result.
-ActivityCompat.shouldShowRequestPermissionRationale()
it will always return false, if called on pre-marshmallow.
Here i am sharing demo code, please take a look at that.
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int hasReadPermission = ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE); if (hasReadPermission != PackageManager.PERMISSION_GRANTED) { showCustomDialog("You need to allow access to External Storage", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 12); } }); } |
We have discussed about Requesting Runtime Permission in last tutorial, but that was for single permission. Today we will discuss about asking for multiple permissions.
Here is some code snippet to take multiple permissions at a time.
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List permissionsRequired = new ArrayList(); final List<String> permissionsList = new ArrayList<String>(); if (!checkPermission(permissionsList, Manifest.permission.READ_EXTERNAL_STORAGE)) permissionsRequired.add("Read External Storage"); if (!checkPermission(permissionsList, Manifest.permission.WRITE_EXTERNAL_STORAGE)) permissionsRequired.add("Write External Storage"); if (!checkPermission(permissionsList, Manifest.permission.WRITE_CONTACTS)) permissionsRequired.add("Write Contacts"); if (permissionsList.size() > 0) { if (permissionsRequired.size() > 0) { // Need Rationale String message = "You need to grant access to " + permissionsRequired.get(0); for (int i = 1; i < permissionsRequired.size(); i++) message = message + ", " + permissionsRequired.get(i); showCustomDialog(message, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { requestPermissions(permissionsList.toArray(new String[permissionsList.size()]), 11); } }); return; } requestPermissions(permissionsList.toArray(new String[permissionsList.size()]), 11); return; } |
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In previous post we have discussed about theory part of Android’s Runtime Permission. Today we will discuss about Requesting Runtime Permission through coding.
As you all know it is Marshmallow functionality so start your new project by setting compileSdkVersion and targetSdkVersion to 23 and mention permission in manifest.xml file.
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<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> |
Now we will check whether READ_EXTERNAL_STORAGE permission is Granted or not with help of checkSelfPermission().
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int hasReadPermission = checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE); |
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