Added setup help

app/src/main/java/eu/faircode/email/FragmentSetup.java

@@ -45,6 +45,7 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
 import android.widget.CompoundButton;
+import android.widget.ImageButton;
 import android.widget.TextView;
 import android.widget.ToggleButton;
 
@@ -74,6 +75,8 @@ import static android.app.Activity.RESULT_OK;
 public class FragmentSetup extends FragmentEx {
     private ViewGroup view;
 
+    private ImageButton ibHelp;
+
     private Button btnAccount;
     private TextView tvAccountDone;
 
@@ -116,6 +119,8 @@ public class FragmentSetup extends FragmentEx {
         view = (ViewGroup) inflater.inflate(R.layout.fragment_setup, container, false);
 
         // Get controls
+        ibHelp = view.findViewById(R.id.ibHelp);
+
         btnAccount = view.findViewById(R.id.btnAccount);
         tvAccountDone = view.findViewById(R.id.tvAccountDone);
 
@@ -135,6 +140,13 @@ public class FragmentSetup extends FragmentEx {
 
         // Wire controls
 
+        ibHelp.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                startActivity(getIntentHelp());
+            }
+        });
+
         btnAccount.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
@@ -230,6 +242,7 @@ public class FragmentSetup extends FragmentEx {
         });
 
         // Initialize
+        ibHelp.setVisibility(View.GONE);
 
         tvAccountDone.setText(null);
         tvAccountDone.setCompoundDrawables(null, null, null, null);
@@ -292,6 +305,9 @@ public class FragmentSetup extends FragmentEx {
     public void onActivityCreated(@Nullable Bundle savedInstanceState) {
         super.onActivityCreated(savedInstanceState);
 
+        PackageManager pm = getContext().getPackageManager();
+        ibHelp.setVisibility(getIntentHelp().resolveActivity(pm) == null ? View.GONE : View.VISIBLE);
+
         DB db = DB.getInstance(getContext());
 
         db.account().liveAccounts(true).observe(getViewLifecycleOwner(), new Observer<List<EntityAccount>>() {
@@ -395,6 +411,12 @@ public class FragmentSetup extends FragmentEx {
         }
     }
 
+    private Intent getIntentHelp() {
+        Intent intent = new Intent(Intent.ACTION_VIEW);
+        intent.setData(Uri.parse("https://github.com/M66B/open-source-email/blob/master/SETUP.md"));
+        return intent;
+    }
+
     private static Intent getIntentExport() {
         Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
         intent.addCategory(Intent.CATEGORY_OPENABLE);