Set activities as secure

Signed-off-by: Mario Danic <mario@lovelyhq.com>

app/src/main/java/com/nextcloud/talk/activities/BaseActivity.java

@@ -24,6 +24,7 @@ import android.annotation.SuppressLint;
 import android.content.Context;
 import android.os.Bundle;
 import android.util.Log;
+import android.view.WindowManager;
 import android.webkit.SslErrorHandler;
 
 import com.nextcloud.talk.R;
@@ -57,8 +58,9 @@ public class BaseActivity extends AppCompatActivity {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
+        getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
         NextcloudTalkApplication.getSharedApplication().getComponentApplication().inject(this);
+        super.onCreate(savedInstanceState);
     }
 
     @Override