Use pager for advanced options

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

@@ -0,0 +1,173 @@
+package eu.faircode.email;
+
+/*
+    This file is part of FairEmail.
+
+    FairEmail is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    FairEmail is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with FairEmail.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018-2019 by Marcel Bokhorst (M66B)
+*/
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.net.ConnectivityManager;
+import android.net.Network;
+import android.net.NetworkCapabilities;
+import android.net.NetworkRequest;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.AdapterView;
+import android.widget.CompoundButton;
+import android.widget.Spinner;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.widget.SwitchCompat;
+import androidx.fragment.app.FragmentActivity;
+import androidx.lifecycle.Lifecycle;
+import androidx.preference.PreferenceManager;
+
+public class FragmentOptionsConnection extends FragmentBase {
+    private TextView tvConnectionType;
+    private TextView tvConnectionRoaming;
+    private SwitchCompat swMetered;
+    private Spinner spDownload;
+    private SwitchCompat swRoaming;
+
+    @Override
+    @Nullable
+    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
+        setSubtitle(R.string.title_advanced);
+
+        View view = inflater.inflate(R.layout.fragment_options_connection, container, false);
+
+        // Get controls
+
+        tvConnectionType = view.findViewById(R.id.tvConnectionType);
+        tvConnectionRoaming = view.findViewById(R.id.tvConnectionRoaming);
+        swMetered = view.findViewById(R.id.swMetered);
+        spDownload = view.findViewById(R.id.spDownload);
+        swRoaming = view.findViewById(R.id.swRoaming);
+
+        // Wire controls
+
+        final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getContext());
+
+        setOptions();
+
+        swMetered.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            @Override
+            public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
+                prefs.edit().putBoolean("metered", checked).apply();
+                ServiceSynchronize.reload(getContext(), "metered=" + checked);
+            }
+        });
+
+        spDownload.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(AdapterView<?> adapterView, View view, int position, long id) {
+                int[] values = getResources().getIntArray(R.array.downloadValues);
+                prefs.edit().putInt("download", values[position]).apply();
+            }
+
+            @Override
+            public void onNothingSelected(AdapterView<?> parent) {
+                prefs.edit().remove("download").apply();
+            }
+        });
+
+        swRoaming.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            @Override
+            public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
+                prefs.edit().putBoolean("roaming", checked).apply();
+                ServiceSynchronize.reload(getContext(), "roaming=" + checked);
+            }
+        });
+
+        return view;
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+
+        ConnectivityManager cm = (ConnectivityManager) getContext().getSystemService(Context.CONNECTIVITY_SERVICE);
+        NetworkRequest.Builder builder = new NetworkRequest.Builder();
+        builder.addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET);
+        cm.registerNetworkCallback(builder.build(), networkCallback);
+    }
+
+    @Override
+    public void onPause() {
+        ConnectivityManager cm = (ConnectivityManager) getContext().getSystemService(Context.CONNECTIVITY_SERVICE);
+        cm.unregisterNetworkCallback(networkCallback);
+
+        super.onPause();
+    }
+
+    private void setOptions() {
+        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getContext());
+
+        swMetered.setChecked(prefs.getBoolean("metered", true));
+
+        int download = prefs.getInt("download", MessageHelper.DEFAULT_ATTACHMENT_DOWNLOAD_SIZE);
+        int[] downloadValues = getResources().getIntArray(R.array.downloadValues);
+        for (int pos = 0; pos < downloadValues.length; pos++)
+            if (downloadValues[pos] == download) {
+                spDownload.setSelection(pos);
+                break;
+            }
+
+        swRoaming.setChecked(prefs.getBoolean("roaming", true));
+    }
+
+    private ConnectivityManager.NetworkCallback networkCallback = new ConnectivityManager.NetworkCallback() {
+        @Override
+        public void onAvailable(Network network) {
+            showConnectionType();
+        }
+
+        @Override
+        public void onCapabilitiesChanged(Network network, NetworkCapabilities networkCapabilities) {
+            showConnectionType();
+        }
+
+        @Override
+        public void onLost(Network network) {
+            showConnectionType();
+        }
+    };
+
+    private void showConnectionType() {
+        FragmentActivity activity = getActivity();
+        if (activity == null)
+            return;
+
+        activity.runOnUiThread(new Runnable() {
+            @Override
+            public void run() {
+                if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.RESUMED)) {
+                    Helper.NetworkState networkState = Helper.getNetworkState(getContext());
+
+                    tvConnectionType.setText(networkState.isUnmetered() ? R.string.title_legend_unmetered : R.string.title_legend_metered);
+                    tvConnectionType.setVisibility(networkState.isConnected() ? View.VISIBLE : View.GONE);
+                    tvConnectionRoaming.setVisibility(networkState.isRoaming() ? View.VISIBLE : View.GONE);
+                }
+            }
+        });
+    }
+}