95 lines
3.6 KiB
Java
95 lines
3.6 KiB
Java
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package com.wireguard.android.activity;
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import android.app.Activity;
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import android.databinding.CallbackRegistry;
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import android.databinding.CallbackRegistry.NotifierCallback;
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import android.os.Bundle;
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import com.wireguard.android.Application;
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import com.wireguard.android.model.Tunnel;
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import com.wireguard.android.model.TunnelManager;
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import java.util.Objects;
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/**
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* Base class for activities that need to remember the currently-selected tunnel.
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*/
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public abstract class BaseActivity extends Activity {
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private static final String TAG = BaseActivity.class.getSimpleName();
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private final SelectionChangeRegistry selectionChangeRegistry = new SelectionChangeRegistry();
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private Tunnel selectedTunnel;
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public void addOnSelectedTunnelChangedListener(
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final OnSelectedTunnelChangedListener listener) {
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selectionChangeRegistry.add(listener);
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}
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public Tunnel getSelectedTunnel() {
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return selectedTunnel;
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}
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@Override
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protected void onCreate(final Bundle savedInstanceState) {
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// Restore the saved tunnel if there is one; otherwise grab it from the arguments.
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String savedTunnelName = null;
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if (savedInstanceState != null)
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savedTunnelName = savedInstanceState.getString(TunnelManager.KEY_SELECTED_TUNNEL);
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else if (getIntent() != null)
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savedTunnelName = getIntent().getStringExtra(TunnelManager.KEY_SELECTED_TUNNEL);
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if (savedTunnelName != null) {
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final TunnelManager manager = Application.getComponent().getTunnelManager();
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selectedTunnel = manager.getTunnels().get(savedTunnelName);
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}
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// The selected tunnel must be set before the superclass method recreates fragments.
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super.onCreate(savedInstanceState);
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}
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@Override
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protected void onSaveInstanceState(final Bundle outState) {
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if (selectedTunnel != null)
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outState.putString(TunnelManager.KEY_SELECTED_TUNNEL, selectedTunnel.getName());
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super.onSaveInstanceState(outState);
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}
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protected abstract Tunnel onSelectedTunnelChanged(Tunnel oldTunnel, Tunnel newTunnel);
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public void removeOnSelectedTunnelChangedListener(
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final OnSelectedTunnelChangedListener listener) {
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selectionChangeRegistry.remove(listener);
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}
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public void setSelectedTunnel(final Tunnel tunnel) {
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final Tunnel oldTunnel = selectedTunnel;
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if (Objects.equals(oldTunnel, tunnel))
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return;
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// Give the activity a chance to override the tunnel change.
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selectedTunnel = onSelectedTunnelChanged(oldTunnel, tunnel);
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if (Objects.equals(oldTunnel, selectedTunnel))
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return;
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selectionChangeRegistry.notifyCallbacks(oldTunnel, 0, selectedTunnel);
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}
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public interface OnSelectedTunnelChangedListener {
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void onSelectedTunnelChanged(Tunnel oldTunnel, Tunnel newTunnel);
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}
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private static final class SelectionChangeNotifier
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extends NotifierCallback<OnSelectedTunnelChangedListener, Tunnel, Tunnel> {
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@Override
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public void onNotifyCallback(final OnSelectedTunnelChangedListener listener,
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final Tunnel oldTunnel, final int ignored,
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final Tunnel newTunnel) {
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listener.onSelectedTunnelChanged(oldTunnel, newTunnel);
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}
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}
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private static final class SelectionChangeRegistry
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extends CallbackRegistry<OnSelectedTunnelChangedListener, Tunnel, Tunnel> {
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private SelectionChangeRegistry() {
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super(new SelectionChangeNotifier());
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}
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}
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}
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