cause = {ErrnoException@5190} "android.system.ErrnoException: open failed: EACCES (Permission denied)"

Question

I am part of the testing team exploring the test recorder using espresso to test our android application.

Planning to run the tests on AWS Device Farm.

Followed their 3 part tutorial @ http://mobile.awsblog.com/post/Tx20RGXMTYT2ZGZ%20/Getting-started-with-Android-testing-on-AWS-Device-Farm-using-Espresso-Part-3

However I am stuck because i am not able to get screenshots for the test. Have this configuration as part of the androidmanifest.xml

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

<uses-permission android:name="android.permission.INTERNET"/>

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

Am using the source code from the below link to get screenshots

https://github.com/awslabs/aws-device-farm-sample-app-for-android/tree/master/app/src/androidTest/java/com/amazonaws/devicefarm/android/referenceapp/Util

However, I still get permission denied when running the test.

Using emulator to run these tests, started with Nexus 5 (API 23) and Nexus 6 (API 23)

Evin1_ Evin1_ · Accepted Answer · 2016-07-10T17:41:09

You are going to need to use the UIAutomator framework to press yes when the permission popup shows up in a testing environment. The following snippet is taken from this medium post, make sure you check it out.

private void allowPermissionsIfNeeded()  {
    if (Build.VERSION.SDK_INT >= 23) {
        UiObject allowPermissions = mDevice.findObject(new UiSelector().text("Allow"));
        if (allowPermissions.exists()) {
            try {
                allowPermissions.click();
            } catch (UiObjectNotFoundException e) {
                Timber.e(e, "There is no permissions dialog to interact with ");
            }
        }
    }
}

You probably need to ask for permissions at runtime since you are running it on an Android device with API 23.

Check on this link to see the full documentation on how to do it.

Following is a small example that shows how to ask for permissions to read the call log in a device. You would have to change a bit the logic to ask for WRITE_EXTERNAL_STORAGE instead of the READ_CALL_LOG permission.

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivityTAG_";

    private static final int CODE_CALL_LOG = 10;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CALL_LOG) != PackageManager.PERMISSION_GRANTED) {
            if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.READ_CALL_LOG)) {
                Log.d(TAG, "onCreate: " + "Show explanation");
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_CALL_LOG}, CODE_CALL_LOG);
            } else {
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_CALL_LOG}, CODE_CALL_LOG);
            }
        } else {
            Log.d(TAG, "onCreate: " + "Permission already granted!");
            printCallLog();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
        switch (requestCode) {
            case CODE_CALL_LOG: {
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    Log.d(TAG, "onRequestPermissionsResult: Good to go!");
                    printCallLog();
                } else {
                    Log.d(TAG, "onRequestPermissionsResult: Bad user");
                }
            }
        }
    }

    private void printCallLog() {
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CALL_LOG) == PackageManager.PERMISSION_GRANTED) {
            Cursor cursor = getContentResolver().query(CallLog.Calls.CONTENT_URI,
                    null,
                    null,
                    null,
                    null);

            while (cursor.moveToNext()) {
                final long dateDialed = cursor.getLong(cursor.getColumnIndex(CallLog.Calls.DATE));
                final String numberDialed = cursor.getString(cursor.getColumnIndex(CallLog.Calls.NUMBER));
                Log.d(TAG, "Call to number: " + numberDialed + "\t registered at: " + new Date(dateDialed).toString());
            }

            cursor.close();
        }
    }
}

This is the link with the full GitHub project.

cause = {ErrnoException@5190} "android.system.ErrnoException: open failed: EACCES (Permission denied)"

1 Answers