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MainActivity: Fix fragment selection logic

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Signed-off-by: Samuel Holland <samuel@sholland.org>
This commit is contained in:
Samuel Holland 2018-07-28 17:06:39 -05:00
parent e29c21f8df
commit ca92ac60b7
4 changed files with 104 additions and 109 deletions
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169
app/src/main/java/com/wireguard/android/activity/MainActivity.java
View File

@ -10,12 +10,13 @@ import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
import android.support.v7.app.ActionBar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.LinearLayout;
import com.wireguard.android.R;
import com.wireguard.android.fragment.TunnelDetailFragment;
@ -23,71 +24,46 @@ import com.wireguard.android.fragment.TunnelEditorFragment;
import com.wireguard.android.fragment.TunnelListFragment;
import com.wireguard.android.model.Tunnel;
import java.util.List;
import java9.util.stream.Stream;
/**
* CRUD interface for WireGuard tunnels. This activity serves as the main entry point to the
* WireGuard application, and contains several fragments for listing, viewing details of, and
* editing the configuration and interface state of WireGuard tunnels.
*/
public class MainActivity extends BaseActivity {
private static final String KEY_STATE = "fragment_state";
private static final String TAG = "WireGuard/" + MainActivity.class.getSimpleName();
private State state = State.EMPTY;
private boolean moveToState(final State nextState) {
if (state == nextState)
return false;
final FragmentManager fragmentManager = getSupportFragmentManager();
Log.i(TAG, "Moving from " + state.name() + " to " + nextState.name());
if (nextState.layer > state.layer + 1) {
moveToState(State.ofLayer(state.layer + 1));
moveToState(nextState);
return true;
} else if (nextState.layer == state.layer + 1) {
final Fragment fragment = Fragment.instantiate(this, nextState.fragment);
final FragmentTransaction transaction = fragmentManager.beginTransaction()
.replace(R.id.master_fragment, fragment)
.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
if (state.layer > 0)
transaction.addToBackStack(null);
transaction.commitAllowingStateLoss(); /* TODO: switch back to .commit() when this function is rewritten. */
} else if (nextState.layer == state.layer - 1) {
if (fragmentManager.getBackStackEntryCount() == 0)
return false;
fragmentManager.popBackStack();
} else if (nextState.layer < state.layer - 1) {
moveToState(State.ofLayer(state.layer - 1));
moveToState(nextState);
return true;
}
state = nextState;
if (state.layer <= State.LIST.layer)
setSelectedTunnel(null);
updateActionBar();
return true;
}
public class MainActivity extends BaseActivity
implements FragmentManager.OnBackStackChangedListener {
@Nullable private ActionBar actionBar;
private boolean isTwoPaneLayout;
@Nullable private TunnelListFragment listFragment;
@Override
public void onBackPressed() {
final List<Fragment> fragments = getSupportFragmentManager().getFragments();
boolean handled = false;
if (!fragments.isEmpty() && fragments.get(0) instanceof TunnelListFragment) {
handled = ((TunnelListFragment) fragments.get(0)).collapseActionMenu();
final int backStackEntries = getSupportFragmentManager().getBackStackEntryCount();
// If the action menu is visible and expanded, collapse it instead of navigating back.
if (isTwoPaneLayout || backStackEntries == 0) {
if (listFragment != null && listFragment.collapseActionMenu())
return;
}
if (!handled) {
handled = moveToState(State.ofLayer(state.layer - 1));
// If the two-pane layout does not have an editor open, going back should exit the app.
if (isTwoPaneLayout && backStackEntries <= 1) {
finish();
return;
}
// Deselect the current tunnel on navigating back from the detail pane to the one-pane list.
if (!isTwoPaneLayout && backStackEntries == 1) {
setSelectedTunnel(null);
return;
}
if (!handled) {
super.onBackPressed();
}
@Override public void onBackStackChanged() {
if (actionBar == null)
return;
// Do not show the home menu when the two-pane layout is at the detail view (see above).
final int backStackEntries = getSupportFragmentManager().getBackStackEntryCount();
final int minBackStackEntries = isTwoPaneLayout ? 2 : 1;
actionBar.setDisplayHomeAsUpEnabled(backStackEntries >= minBackStackEntries);
}
// We use onTouchListener here to avoid the UI click sound, hence
@ -97,25 +73,14 @@ public class MainActivity extends BaseActivity {
protected void onCreate(@Nullable final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
if (savedInstanceState != null && savedInstanceState.getString(KEY_STATE) != null)
state = State.valueOf(savedInstanceState.getString(KEY_STATE));
if (state == State.EMPTY) {
State initialState = getSelectedTunnel() != null ? State.DETAIL : State.LIST;
if (getIntent() != null && getIntent().getStringExtra(KEY_STATE) != null)
initialState = State.valueOf(getIntent().getStringExtra(KEY_STATE));
moveToState(initialState);
}
updateActionBar();
final int actionBarId = getResources().getIdentifier("action_bar", "id", getPackageName());
if (actionBarId != 0 && findViewById(actionBarId) != null) {
findViewById(actionBarId).setOnTouchListener((v, e) -> {
final List<Fragment> fragments = getSupportFragmentManager().getFragments();
if (!fragments.isEmpty() && fragments.get(0) instanceof TunnelListFragment) {
((TunnelListFragment) fragments.get(0)).collapseActionMenu();
}
return false;
});
}
actionBar = getSupportActionBar();
isTwoPaneLayout = findViewById(R.id.master_detail_wrapper) instanceof LinearLayout;
listFragment = (TunnelListFragment) getSupportFragmentManager().findFragmentByTag("LIST");
getSupportFragmentManager().addOnBackStackChangedListener(this);
onBackStackChanged();
final View actionBarView = findViewById(R.id.action_bar);
if (actionBarView != null)
actionBarView.setOnTouchListener((v, e) -> listFragment != null && listFragment.collapseActionMenu());
}
@Override
@ -129,11 +94,14 @@ public class MainActivity extends BaseActivity {
switch (item.getItemId()) {
case android.R.id.home:
// The back arrow in the action bar should act the same as the back button.
moveToState(State.ofLayer(state.layer - 1));
onBackPressed();
return true;
case R.id.menu_action_edit:
if (getSelectedTunnel() != null)
moveToState(State.EDITOR);
getSupportFragmentManager().beginTransaction()
.replace(R.id.detail_container, new TunnelEditorFragment())
.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE)
.addToBackStack(null)
.commit();
return true;
case R.id.menu_action_save:
// This menu item is handled by the editor fragment.
@ -147,37 +115,26 @@ public class MainActivity extends BaseActivity {
}
@Override
protected void onSaveInstanceState(final Bundle outState) {
outState.putString(KEY_STATE, state.name());
super.onSaveInstanceState(outState);
protected void onSelectedTunnelChanged(@Nullable final Tunnel oldTunnel,
@Nullable final Tunnel newTunnel) {
final FragmentManager fragmentManager = getSupportFragmentManager();
final int backStackEntries = fragmentManager.getBackStackEntryCount();
if (newTunnel == null) {
// Clear everything off the back stack (all editors and detail fragments).
fragmentManager.popBackStackImmediate(0, FragmentManager.POP_BACK_STACK_INCLUSIVE);
return;
}
@Override
protected void onSelectedTunnelChanged(@Nullable final Tunnel oldTunnel, @Nullable final Tunnel newTunnel) {
moveToState(newTunnel != null ? State.DETAIL : State.LIST);
}
private void updateActionBar() {
if (getSupportActionBar() != null)
getSupportActionBar().setDisplayHomeAsUpEnabled(state.layer > State.LIST.layer);
}
private enum State {
EMPTY(null, 0),
LIST(TunnelListFragment.class, 1),
DETAIL(TunnelDetailFragment.class, 2),
EDITOR(TunnelEditorFragment.class, 3);
@Nullable private final String fragment;
private final int layer;
State(@Nullable final Class<? extends Fragment> fragment, final int layer) {
this.fragment = fragment != null ? fragment.getName() : null;
this.layer = layer;
}
private static State ofLayer(final int layer) {
return Stream.of(State.values()).filter(s -> s.layer == layer).findFirst().get();
if (backStackEntries == 2) {
// Pop the editor off the back stack to reveal the detail fragment. Use the immediate
// method to avoid the editor picking up the new tunnel while it is still visible.
fragmentManager.popBackStackImmediate();
} else if (backStackEntries == 0) {
// Create and show a new detail fragment.
fragmentManager.beginTransaction()
.add(R.id.detail_container, new TunnelDetailFragment())
.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE)
.addToBackStack(null)
.commit();
}
}
}

1
app/src/main/java/com/wireguard/android/fragment/TunnelEditorFragment.java
View File

@ -174,6 +174,7 @@ public class TunnelEditorFragment extends BaseFragment implements AppExclusionLi
}
// Tell the activity to finish itself or go back to the detail view.
getActivity().runOnUiThread(() -> {
// TODO(smaeul): Remove this hack when fixing the Config ViewModel
// The selected tunnel has to actually change, but we have to remember this one.
final Tunnel savedTunnel = tunnel;
if (savedTunnel == getSelectedTunnel())

25
app/src/main/res/layout-w600dp/main_activity.xml Normal file
View File

@ -0,0 +1,25 @@
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/master_detail_wrapper"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:baselineAligned="false"
android:divider="?android:attr/dividerHorizontal"
android:orientation="horizontal"
android:showDividers="middle"
tools:context=".activity.MainActivity">
<fragment
android:name="com.wireguard.android.fragment.TunnelListFragment"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="2"
android:tag="LIST" />
<FrameLayout
android:id="@+id/detail_container"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="3" />
</LinearLayout>

16
app/src/main/res/layout/main_activity.xml
View File

@ -1,7 +1,19 @@
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/master_fragment"
android:id="@+id/master_detail_wrapper"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:ignore="MergeRootFrame" />
tools:context=".activity.MainActivity">
<fragment
android:name="com.wireguard.android.fragment.TunnelListFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:tag="LIST" />
<FrameLayout
android:id="@+id/detail_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</FrameLayout>