Create launcher widget for todo, closes #1997

app/src/main/AndroidManifest.xml

@@ -110,6 +110,22 @@
             android:name="other.writeily.widget.WrFilesWidgetService"
             android:permission="android.permission.BIND_REMOTEVIEWS" />
 
+        <receiver
+            android:name=".widget.TodoWidgetProvider"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
+            </intent-filter>
+
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/todo_widget" />
+        </receiver>
+
+        <service
+            android:name=".widget.TodoWidgetService"
+            android:permission="android.permission.BIND_REMOTEVIEWS" />
+
         <provider
             android:name="androidx.core.content.FileProvider"
             android:authorities="${applicationId}.provider"

app/src/main/java/net/gsantner/markor/activity/DocumentEditAndViewFragment.java

@@ -55,6 +55,7 @@
 import net.gsantner.markor.model.Document;
 import net.gsantner.markor.util.MarkorContextUtils;
 import net.gsantner.markor.web.MarkorWebViewClient;
+import net.gsantner.markor.widget.TodoWidgetProvider;
 import net.gsantner.opoc.frontend.filebrowser.GsFileBrowserOptions;
 import net.gsantner.opoc.frontend.settings.GsFontPreferenceCompat;
 import net.gsantner.opoc.frontend.textview.TextViewUndoRedo;
@@ -287,6 +288,7 @@ public void onPause() {
         _appSettings.addRecentFile(_document.getFile());
         _appSettings.setDocumentPreviewState(_document.getPath(), _isPreviewVisible);
         _appSettings.setLastEditPosition(_document.getPath(), _hlEditor.getSelectionStart());
+        TodoWidgetProvider.updateTodoWidgets();
         super.onPause();
     }
 

app/src/main/java/net/gsantner/markor/activity/MainActivity.java

@@ -39,6 +39,7 @@
 import net.gsantner.markor.frontend.filebrowser.MarkorFileBrowserFactory;
 import net.gsantner.markor.model.Document;
 import net.gsantner.markor.util.MarkorContextUtils;
+import net.gsantner.markor.widget.TodoWidgetProvider;
 import net.gsantner.opoc.format.GsSimpleMarkdownParser;
 import net.gsantner.opoc.frontend.base.GsFragmentBase;
 import net.gsantner.opoc.frontend.filebrowser.GsFileBrowserFragment;
@@ -503,6 +504,7 @@ public GsFileBrowserFragment getNotebook() {
     protected void onPause() {
         super.onPause();
         WrMarkorWidgetProvider.updateLauncherWidgets();
+        TodoWidgetProvider.updateTodoWidgets();
     }
 
     @Override

app/src/main/java/net/gsantner/markor/widget/TodoWidgetProvider.java

@@ -0,0 +1,68 @@
+package net.gsantner.markor.widget;
+
+import android.app.PendingIntent;
+import android.appwidget.AppWidgetManager;
+import android.appwidget.AppWidgetProvider;
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Build;
+import android.widget.RemoteViews;
+
+import net.gsantner.markor.ApplicationObject;
+import net.gsantner.markor.R;
+import net.gsantner.markor.activity.openeditor.OpenFromShortcutOrWidgetActivity;
+import net.gsantner.markor.model.AppSettings;
+import net.gsantner.markor.model.Document;
+
+public class TodoWidgetProvider extends AppWidgetProvider {
+
+    @Override
+    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+
+        int requestCode = 1;
+        final AppSettings appSettings = ApplicationObject.settings();
+        final int staticFlags = PendingIntent.FLAG_UPDATE_CURRENT | (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M ? PendingIntent.FLAG_IMMUTABLE : 0);
+
+        for (int appWidgetId : appWidgetIds) {
+
+            RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.todo_widget_layout);
+
+            final Intent intent = new Intent(context, TodoWidgetService.class);
+            views.setRemoteAdapter(R.id.todo_widget_list_view, intent);
+            views.setEmptyView(R.id.todo_widget_list_view, R.id.todo_widget_empty_view);
+
+            final Intent openTodo = new Intent(context, OpenFromShortcutOrWidgetActivity.class)
+                    .setAction(Intent.ACTION_EDIT)
+                    .putExtra(Document.EXTRA_FILE, appSettings.getTodoFile())
+                    .putExtra(Document.EXTRA_FILE_LINE_NUMBER, Document.EXTRA_FILE_LINE_NUMBER_LAST);
+            views.setPendingIntentTemplate(R.id.todo_widget_list_view, PendingIntent.getActivity(context, requestCode++, openTodo, staticFlags));
+            views.setOnClickPendingIntent(R.id.todo_widget_container, PendingIntent.getActivity(context, requestCode++, openTodo, staticFlags));
+
+            // Tell the AppWidgetManager to perform an update on the current app widget
+            appWidgetManager.updateAppWidget(appWidgetId, views);
+        }
+
+        super.onUpdate(context, appWidgetManager, appWidgetIds);
+    }
+
+    // Update all widget lists and shortcuts for all widgets
+    public static void updateTodoWidgets() {
+        final Context context = ApplicationObject.get().getApplicationContext();
+        final AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
+        if (appWidgetManager == null) {
+            // The device does not support widgets.
+            return;
+        }
+        final ComponentName comp = new ComponentName(context, TodoWidgetProvider.class);
+        final int[] appWidgetIds = appWidgetManager.getAppWidgetIds(comp);
+
+        // Update List
+        appWidgetManager.notifyAppWidgetViewDataChanged(appWidgetIds, R.id.todo_widget_list_view);
+
+        // Trigger remote views update
+        context.sendBroadcast(new Intent(context, TodoWidgetProvider.class)
+                .setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE)
+                .putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, appWidgetIds));
+    }
+}

app/src/main/java/net/gsantner/markor/widget/TodoWidgetRemoteViewsFactory.java

@@ -0,0 +1,96 @@
+package net.gsantner.markor.widget;
+
+import android.content.Context;
+import android.content.Intent;
+import android.widget.RemoteViews;
+import android.widget.RemoteViewsService;
+
+import net.gsantner.markor.ApplicationObject;
+import net.gsantner.markor.R;
+import net.gsantner.markor.model.AppSettings;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class TodoWidgetRemoteViewsFactory implements RemoteViewsService.RemoteViewsFactory {
+
+    private final Context _context;
+    private final List<String> _lines;
+
+    public TodoWidgetRemoteViewsFactory(Context context, Intent intent) {
+        _context = context;
+        _lines = new ArrayList<>();
+    }
+
+    @Override
+    public void onCreate() {
+        onDataSetChanged();
+    }
+
+    @Override
+    public void onDataSetChanged() {
+        _lines.clear();
+        AppSettings appSettings = ApplicationObject.settings();
+        File todoFile = appSettings.getTodoFile();
+        _lines.addAll(readFileContent(todoFile));
+    }
+
+    @Override
+    public void onDestroy() {
+        _lines.clear();
+    }
+
+    @Override
+    public int getCount() {
+        return _lines.size();
+    }
+
+    @Override
+    public RemoteViews getViewAt(int position) {
+        RemoteViews views = new RemoteViews(_context.getPackageName(), R.layout.todo_widget_list_item);
+        views.setTextViewText(R.id.todo_widget_item_text, _lines.get(position));
+
+        final Intent fillInIntent = new Intent();
+        views.setOnClickFillInIntent(R.id.todo_widget_item_text, fillInIntent);
+
+        return views;
+    }
+
+    @Override
+    public RemoteViews getLoadingView() {
+        return null;
+    }
+
+    @Override
+    public int getViewTypeCount() {
+        return 1;
+    }
+
+    @Override
+    public long getItemId(int position) {
+        return position;
+    }
+
+    @Override
+    public boolean hasStableIds() {
+        return false;
+    }
+
+    private List<String> readFileContent(File file) {
+        List<String> content = new ArrayList<>();
+        try (BufferedReader br = new BufferedReader(new FileReader(file))) {
+            String line;
+            while ((line = br.readLine()) != null) {
+                content.add(line);
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+            content.add("Error reading file");
+        }
+        return content;
+    }
+}

app/src/main/java/net/gsantner/markor/widget/TodoWidgetService.java

@@ -0,0 +1,12 @@
+
+package net.gsantner.markor.widget;
+
+import android.content.Intent;
+import android.widget.RemoteViewsService;
+
+public class TodoWidgetService extends RemoteViewsService {
+    @Override
+    public RemoteViewsFactory onGetViewFactory(Intent intent) {
+        return (new TodoWidgetRemoteViewsFactory(getApplicationContext(), intent));
+    }
+}

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

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/todo_widget_container"
+    android:orientation="vertical"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@color/background">
+
+    <ListView
+        android:id="@+id/todo_widget_list_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:divider="@color/grey"
+        android:dividerHeight="0.5dp" />
+
+    <TextView
+        android:id="@+id/todo_widget_empty_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:text="Empty"
+        android:gravity="center"
+        android:visibility="gone" />
+</LinearLayout>

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

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<TextView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/todo_widget_item_text"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:padding="3dp"
+    android:textSize="15sp"
+    android:textColor="@color/primary_text" />

app/src/main/res/xml/todo_widget.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
+    android:initialLayout="@layout/todo_widget_layout"
+    android:minWidth="200dp"
+    android:minHeight="100dp"
+    android:targetCellHeight="2"
+    android:targetCellWidth="3"
+    android:minResizeWidth="100dp"
+    android:minResizeHeight="50dp"
+    android:resizeMode="horizontal|vertical"
+    android:updatePeriodMillis="1800000" />