How to get android app permission?

Question

Java

ActivityCompat.requestPermissions(MainActivity.this, new String[] {Manifest.permission.READ_CONTACTS}, REQUEST_CODE_PERMISSION_READ_CONTACTS);

It also throws an error

int permissionStatus = ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_CONTACTS);
restext.setText(Integer.toString(permissionStatus));

Gives -1 is this normal?

Answer 1

just a guess. Is the REQUEST_CODE_PERMISSION_READ_CONTACTS variable declared?)

/**
* Id to identify a contacts permission request.
*/
 private static final int REQUEST_CODE_PERMISSION_READ_CONTACTS = 0;

and another piece

// Verify that all required contact permissions have been granted.
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS) !=
    PackageManager.PERMISSION_GRANTED ||
    ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_CONTACTS) !=
    PackageManager.PERMISSION_GRANTED) {
    // Contacts permissions have not been granted.
    Log.i(TAG, "Contact permissions has NOT been granted. Requesting permissions.");
    requestContactsPermissions();

}

Source