[app] Add empty view to lists (#575)

app/src/main/java/org/lsposed/manager/ui/activity/LogsActivity.java

@@ -71,6 +71,8 @@ import java.util.List;
 import java.util.Locale;
 
 import rikka.core.os.FileUtils;
+import rikka.core.res.ResourcesKt;
+import rikka.insets.WindowInsetsHelperKt;
 import rikka.recyclerview.RecyclerViewKt;
 
 @SuppressLint("NotifyDataSetChanged")
@@ -132,16 +134,15 @@ public class LogsActivity extends BaseActivity {
                     .setCancelable(false)
                     .show();
         }
+        if (!ConfigManager.isVerboseLogEnabled()) {
+            WindowInsetsHelperKt.setInitialPadding(binding.recyclerView, 0, ResourcesKt.resolveDimensionPixelOffset(getTheme(), R.attr.actionBarSize, 0), 0, 0);
+            binding.slidingTabs.setVisibility(View.GONE);
+        }
         adapter = new LogsAdapter();
         RecyclerViewKt.fixEdgeEffect(binding.recyclerView, false, true);
         binding.recyclerView.setAdapter(adapter);
         layoutManager = new LinearLayoutManagerFix(this);
         binding.recyclerView.setLayoutManager(layoutManager);
-        if (!ConfigManager.isVerboseLogEnabled()) {
-            binding.slidingTabs.setVisibility(View.GONE);
-        } else {
-            RecyclerViewKt.addVerticalPadding(binding.recyclerView, 48, 0);
-        }
         binding.slidingTabs.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
             @Override
             public void onTabSelected(TabLayout.Tab tab) {
@@ -224,7 +225,6 @@ public class LogsActivity extends BaseActivity {
 
     private void clear() {
         if (ConfigManager.clearLogs(verbose)) {
-            adapter.setEmpty();
             Snackbar.make(binding.snackbar, R.string.logs_cleared, Snackbar.LENGTH_SHORT).show();
             reloadErrorLog();
         } else {
@@ -316,11 +316,8 @@ public class LogsActivity extends BaseActivity {
 
         @Override
         protected void onPostExecute(List<String> logs) {
-            if (logs.size() == 0) {
-                adapter.setEmpty();
-            } else {
             adapter.setLogs(logs);
-            }
+
             handler.removeCallbacks(mRunnable);//It loaded so fast that no need to show progress
             if (mProgressDialog.isShowing()) {
                 mProgressDialog.dismiss();
@@ -349,7 +346,6 @@ public class LogsActivity extends BaseActivity {
             if (binding.recyclerView.getWidth() < desiredWidth) {
                 binding.recyclerView.requestLayout();
             }
-
         }
 
         void setLogs(List<String> logs) {
@@ -358,12 +354,6 @@ public class LogsActivity extends BaseActivity {
             notifyDataSetChanged();
         }
 
-        void setEmpty() {
-            logs.clear();
-            logs.add(getString(R.string.log_is_empty));
-            notifyDataSetChanged();
-        }
-
         @Override
         public int getItemCount() {
             return logs.size();

app/src/main/java/org/lsposed/manager/ui/activity/ModulesActivity.java

@@ -72,6 +72,7 @@ import org.lsposed.manager.databinding.ActivityModuleDetailBinding;
 import org.lsposed.manager.databinding.ItemRepoRecyclerviewBinding;
 import org.lsposed.manager.repo.RepoLoader;
 import org.lsposed.manager.ui.activity.base.BaseActivity;
+import org.lsposed.manager.ui.widget.EmptyStateRecyclerView;
 import org.lsposed.manager.util.GlideApp;
 import org.lsposed.manager.util.LinearLayoutManagerFix;
 import org.lsposed.manager.util.ModuleUtil;
@@ -211,14 +212,18 @@ public class ModulesActivity extends BaseActivity implements ModuleUtil.ModuleLi
 
     @Override
     public void onSingleInstalledModuleReloaded() {
-        adapters.forEach(ModuleAdapter::refresh);
+        adapters.forEach(adapter -> {
+            adapter.refresh(true);
+        });
     }
 
     @Override
     public boolean onOptionsItemSelected(@NonNull MenuItem item) {
         int itemId = item.getItemId();
         if (itemId == R.id.menu_refresh) {
-            adapters.forEach(ModuleAdapter::refresh);
+            adapters.forEach(adapter -> {
+                adapter.refresh(true);
+            });
         }
         return super.onOptionsItemSelected(item);
     }
@@ -322,10 +327,11 @@ public class ModulesActivity extends BaseActivity implements ModuleUtil.ModuleLi
         }
     }
 
-    private class ModuleAdapter extends RecyclerView.Adapter<ModuleAdapter.ViewHolder> implements Filterable {
+    private class ModuleAdapter extends EmptyStateRecyclerView.EmptyStateAdapter<ModuleAdapter.ViewHolder> implements Filterable {
         private final List<ModuleUtil.InstalledModule> searchList = new ArrayList<>();
         private final List<ModuleUtil.InstalledModule> showList = new ArrayList<>();
         private final int userId;
+        private boolean isLoaded;
 
         ModuleAdapter(int userId) {
             this.userId = userId;
@@ -470,6 +476,11 @@ public class ModulesActivity extends BaseActivity implements ModuleUtil.ModuleLi
             }
         };
 
+        @Override
+        public boolean isLoaded() {
+            return isLoaded;
+        }
+
         class ViewHolder extends RecyclerView.ViewHolder {
             View root;
             ImageView appIcon;
@@ -522,6 +533,7 @@ public class ModulesActivity extends BaseActivity implements ModuleUtil.ModuleLi
                 showList.clear();
                 //noinspection unchecked
                 showList.addAll((List<ModuleUtil.InstalledModule>) results.values);
+                isLoaded = true;
                 notifyDataSetChanged();
             }
         }

app/src/main/java/org/lsposed/manager/ui/widget/EmptyStateRecyclerView.java

@@ -0,0 +1,97 @@
+package org.lsposed.manager.ui.widget;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.text.Layout;
+import android.text.StaticLayout;
+import android.text.TextPaint;
+import android.util.AttributeSet;
+import android.util.DisplayMetrics;
+
+import androidx.annotation.Nullable;
+
+import org.lsposed.manager.R;
+
+import rikka.core.res.ResourcesKt;
+import rikka.widget.borderview.BorderRecyclerView;
+
+public class EmptyStateRecyclerView extends BorderRecyclerView {
+    private final TextPaint paint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
+    private final String emptyText;
+    private final AdapterDataObserver emptyObserver = new AdapterDataObserver() {
+
+        @Override
+        public void onChanged() {
+            Adapter<?> adapter = getAdapter();
+            if (adapter != null) {
+                boolean newEmpty = adapter.getItemCount() == 0;
+                if (empty != newEmpty) {
+                    empty = newEmpty;
+                    invalidate();
+                }
+            }
+        }
+    };
+
+    private boolean empty = false;
+
+
+    public EmptyStateRecyclerView(Context context) {
+        this(context, null);
+    }
+
+    public EmptyStateRecyclerView(Context context, @Nullable AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public EmptyStateRecyclerView(Context context, @Nullable AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        DisplayMetrics dm = context.getResources().getDisplayMetrics();
+
+        paint.setColor(ResourcesKt.resolveColor(context.getTheme(), android.R.attr.textColorSecondary));
+        paint.setTextSize(16f * dm.scaledDensity);
+
+        emptyText = context.getString(R.string.list_empty);
+    }
+
+    @Override
+    public void setAdapter(Adapter adapter) {
+        var oldAdapter = getAdapter();
+        if (oldAdapter != null) {
+            oldAdapter.unregisterAdapterDataObserver(emptyObserver);
+        }
+        super.setAdapter(adapter);
+        if (adapter != null) {
+            adapter.registerAdapterDataObserver(emptyObserver);
+            if (adapter instanceof EmptyStateAdapter && ((EmptyStateAdapter<?>) adapter).isLoaded()) {
+                emptyObserver.onChanged();
+            }
+        }
+    }
+
+    @Override
+    protected void dispatchDraw(Canvas canvas) {
+        super.dispatchDraw(canvas);
+
+        if (empty) {
+            final int width = getMeasuredWidth() - getPaddingLeft() - getPaddingRight();
+            final int height = getMeasuredHeight() - getPaddingTop() - getPaddingBottom();
+
+            var textLayout = new StaticLayout(emptyText, paint, width, Layout.Alignment.ALIGN_CENTER, 1.0f, 0.0f, false);
+
+            canvas.save();
+            canvas.translate(getPaddingLeft(), (height >> 1) + getPaddingTop() - (textLayout.getHeight() >> 1));
+
+            textLayout.draw(canvas);
+
+            canvas.restore();
+        }
+    }
+
+
+    public abstract static class EmptyStateAdapter<T extends ViewHolder> extends Adapter<T> {
+        abstract public boolean isLoaded();
+    }
+
+}

app/src/main/res/layout/activity_app_list.xml

@@ -72,7 +72,7 @@
             android:layout_height="match_parent"
             android:id="@+id/swipeRefreshLayout">
 
-            <rikka.widget.borderview.BorderRecyclerView
+            <org.lsposed.manager.ui.widget.EmptyStateRecyclerView
                 android:id="@+id/recyclerView"
                 android:layout_width="match_parent"
                 android:layout_height="match_parent"

app/src/main/res/layout/activity_list.xml

@@ -54,7 +54,7 @@
         android:layout_marginTop="?actionBarSize"
         app:layout_fitSystemWindowsInsets="top" />
 
-    <rikka.widget.borderview.BorderRecyclerView
+    <org.lsposed.manager.ui.widget.EmptyStateRecyclerView
         android:id="@+id/recyclerView"
         android:layout_width="match_parent"
         android:layout_height="match_parent"

app/src/main/res/layout/activity_logs.xml

@@ -71,14 +71,15 @@
         android:id="@+id/horizontalScrollView"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
+        android:fillViewport="true"
         android:scrollbars="none">
 
-        <rikka.widget.borderview.BorderRecyclerView
+        <org.lsposed.manager.ui.widget.EmptyStateRecyclerView
             android:id="@+id/recyclerView"
             android:layout_width="wrap_content"
             android:layout_height="match_parent"
             android:clipToPadding="false"
-            android:paddingTop="?actionBarSize"
+            android:paddingTop="104dp"
             app:borderTopVisibility="whenTop"
             app:borderTopDrawable="@null"
             app:borderBottomVisibility="never"

app/src/main/res/layout/item_repo_recyclerview.xml

@@ -18,7 +18,7 @@
   ~ Copyright (C) 2021 LSPosed Contributors
   -->
 
-<rikka.widget.borderview.BorderRecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
+<org.lsposed.manager.ui.widget.EmptyStateRecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:id="@+id/recyclerView"
     android:layout_width="match_parent"

app/src/main/res/values-zh-rCN/strings.xml

@@ -85,6 +85,7 @@
     <string name="module_uninstall_message">要卸载此模块吗？</string>
     <string name="module_uninstalled">已卸载%1$s</string>
     <string name="module_uninstall_failed">卸载失败</string>
+    <string name="user_title">用户 %d</string>
 
     <!-- AppListActivity -->
     <string name="compile_speed">重新优化</string>
@@ -177,4 +178,5 @@
     <string name="NotInstallDetail">LSPosed 未安装</string>
     <string name="translators"><![CDATA[<a href="https://github.com/LSPosed/LSPosed">LSPosed</a>]]></string>
     <string name="copy_toast_msg">已复制</string>
+    <string name="list_empty">¯\\\\_(ツ)_\/¯\n空空如也</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -179,4 +179,5 @@
     <string name="NotInstallDetail">LSPosed is not Installed</string>
     <string name="translators"><![CDATA[<a href="https://github.com/LSPosed/LSPosed">LSPosed</a>]]></string>
     <string name="copy_toast_msg">Copied</string>
+    <string name="list_empty">¯\\\\_(ツ)_\/¯\nNothing here</string>
 </resources>