adding an initial widget implementation

app/src/main/AndroidManifest.xml

@@ -215,6 +215,15 @@
             </intent-filter>
         </activity>
 
+        <activity
+            android:name=".activities.WidgetConfigureActivity"
+            android:screenOrientation="portrait"
+            android:theme="@style/MyWidgetConfigTheme">
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_CONFIGURE"/>
+            </intent-filter>
+        </activity>
+
         <provider
             android:name="androidx.core.content.FileProvider"
             android:authorities="${applicationId}.provider"
@@ -233,6 +242,18 @@
             </intent-filter>
         </receiver>
 
+        <receiver
+            android:name=".helpers.MyWidgetProvider"
+            android:icon="@mipmap/ic_launcher">
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>
+            </intent-filter>
+
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/widget_info"/>
+        </receiver>
+
         <activity-alias
             android:name=".activities.SplashActivity.Red"
             android:enabled="false"

app/src/main/kotlin/com/simplemobiletools/gallery/pro/activities/MediaActivity.kt

@@ -697,8 +697,7 @@ class MediaActivity : SimpleActivity(), MediaOperationsListener {
         val pathToCheck = if (mPath.isEmpty()) SHOW_ALL else mPath
         val hasSections = config.getFolderGrouping(pathToCheck) and GROUP_BY_NONE == 0 && !config.scrollHorizontally
         val sectionTitleHeight = if (hasSections) layoutManager.getChildAt(0)?.height ?: 0 else 0
-        val thumbnailHeight = if (hasSections) layoutManager.getChildAt(1)?.height ?: 0 else layoutManager.getChildAt(0)?.height
+        val thumbnailHeight = if (hasSections) layoutManager.getChildAt(1)?.height ?: 0 else layoutManager.getChildAt(0)?.height ?: 0
-                ?: 0
 
         var fullHeight = 0
         var curSectionItems = 0

app/src/main/kotlin/com/simplemobiletools/gallery/pro/activities/WidgetConfigureActivity.kt

@@ -0,0 +1,112 @@
+package com.simplemobiletools.gallery.pro.activities
+
+import android.app.Activity
+import android.appwidget.AppWidgetManager
+import android.content.Intent
+import android.graphics.Color
+import android.os.Bundle
+import android.widget.RemoteViews
+import com.simplemobiletools.commons.dialogs.ColorPickerDialog
+import com.simplemobiletools.commons.extensions.adjustAlpha
+import com.simplemobiletools.commons.extensions.onSeekBarChangeListener
+import com.simplemobiletools.commons.extensions.setBackgroundColor
+import com.simplemobiletools.commons.extensions.setFillWithStroke
+import com.simplemobiletools.gallery.pro.R
+import com.simplemobiletools.gallery.pro.extensions.config
+import com.simplemobiletools.gallery.pro.extensions.widgetsDB
+import com.simplemobiletools.gallery.pro.helpers.MyWidgetProvider
+import com.simplemobiletools.gallery.pro.models.Widget
+import kotlinx.android.synthetic.main.widget_config.*
+
+class WidgetConfigureActivity : SimpleActivity() {
+    private var mBgAlpha = 0f
+    private var mWidgetId = 0
+    private var mBgColor = 0
+    private var mBgColorWithoutTransparency = 0
+
+    public override fun onCreate(savedInstanceState: Bundle?) {
+        useDynamicTheme = false
+        super.onCreate(savedInstanceState)
+        setResult(RESULT_CANCELED)
+        setContentView(R.layout.widget_config)
+        initVariables()
+
+        mWidgetId = intent.extras?.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID) ?: AppWidgetManager.INVALID_APPWIDGET_ID
+
+        if (mWidgetId == AppWidgetManager.INVALID_APPWIDGET_ID) {
+            finish()
+        }
+
+        config_save.setOnClickListener { saveConfig() }
+        config_bg_color.setOnClickListener { pickBackgroundColor() }
+    }
+
+    private fun initVariables() {
+        mBgColor = config.widgetBgColor
+        if (mBgColor == 1) {
+            mBgColor = Color.BLACK
+            mBgAlpha = .2f
+        } else {
+            mBgAlpha = Color.alpha(mBgColor) / 255f
+        }
+
+        mBgColorWithoutTransparency = Color.rgb(Color.red(mBgColor), Color.green(mBgColor), Color.blue(mBgColor))
+        config_bg_seekbar.apply {
+            progress = (mBgAlpha * 100).toInt()
+
+            onSeekBarChangeListener {
+                mBgAlpha = it / 100f
+                updateBackgroundColor()
+            }
+        }
+        updateBackgroundColor()
+    }
+
+    private fun saveConfig() {
+        val views = RemoteViews(packageName, R.layout.widget)
+        views.setBackgroundColor(R.id.widget_holder, mBgColor)
+        AppWidgetManager.getInstance(this).updateAppWidget(mWidgetId, views)
+        val widget = Widget(null, mWidgetId, "/storage/emulated/0")
+        Thread {
+            widgetsDB.insertOrUpdate(widget)
+        }.start()
+
+        storeWidgetBackground()
+        requestWidgetUpdate()
+
+        Intent().apply {
+            putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mWidgetId)
+            setResult(Activity.RESULT_OK, this)
+        }
+        finish()
+    }
+
+    private fun storeWidgetBackground() {
+        config.apply {
+            widgetBgColor = mBgColor
+        }
+    }
+
+    private fun requestWidgetUpdate() {
+        Intent(AppWidgetManager.ACTION_APPWIDGET_UPDATE, null, this, MyWidgetProvider::class.java).apply {
+            putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, intArrayOf(mWidgetId))
+            sendBroadcast(this)
+        }
+    }
+
+    private fun updateBackgroundColor() {
+        mBgColor = mBgColorWithoutTransparency.adjustAlpha(mBgAlpha)
+        config_save.setBackgroundColor(mBgColor)
+        config_image_holder.setBackgroundColor(mBgColor)
+        config_bg_color.setFillWithStroke(mBgColor, Color.BLACK)
+    }
+
+    private fun pickBackgroundColor() {
+        ColorPickerDialog(this, mBgColorWithoutTransparency) { wasPositivePressed, color ->
+            if (wasPositivePressed) {
+                mBgColorWithoutTransparency = color
+                updateBackgroundColor()
+            }
+        }
+    }
+}

app/src/main/kotlin/com/simplemobiletools/gallery/pro/extensions/Context.kt

@@ -25,6 +25,7 @@ import com.simplemobiletools.gallery.pro.databases.GalleryDatabase
 import com.simplemobiletools.gallery.pro.helpers.*
 import com.simplemobiletools.gallery.pro.interfaces.DirectoryDao
 import com.simplemobiletools.gallery.pro.interfaces.MediumDao
+import com.simplemobiletools.gallery.pro.interfaces.WidgetsDao
 import com.simplemobiletools.gallery.pro.models.Directory
 import com.simplemobiletools.gallery.pro.models.Medium
 import com.simplemobiletools.gallery.pro.models.ThumbnailItem
@@ -104,6 +105,8 @@ val Context.config: Config get() = Config.newInstance(applicationContext)
 
 val Context.galleryDB: GalleryDatabase get() = GalleryDatabase.getInstance(applicationContext)
 
+val Context.widgetsDB: WidgetsDao get() = GalleryDatabase.getInstance(applicationContext).WidgetsDao()
+
 val Context.recycleBin: File get() = filesDir
 
 val Context.recycleBinPath: String get() = filesDir.absolutePath

app/src/main/kotlin/com/simplemobiletools/gallery/pro/helpers/MyWidgetProvider.kt

@@ -0,0 +1,37 @@
+package com.simplemobiletools.gallery.pro.helpers
+
+import android.app.PendingIntent
+import android.appwidget.AppWidgetManager
+import android.appwidget.AppWidgetProvider
+import android.content.Context
+import android.content.Intent
+import android.widget.RemoteViews
+import com.simplemobiletools.commons.extensions.setBackgroundColor
+import com.simplemobiletools.gallery.pro.R
+import com.simplemobiletools.gallery.pro.activities.MediaActivity
+import com.simplemobiletools.gallery.pro.extensions.config
+import com.simplemobiletools.gallery.pro.extensions.widgetsDB
+import com.simplemobiletools.gallery.pro.models.Widget
+
+class MyWidgetProvider : AppWidgetProvider() {
+    private fun setupAppOpenIntent(context: Context, views: RemoteViews, id: Int, widget: Widget) {
+        val intent = Intent(context, MediaActivity::class.java).apply {
+            putExtra(DIRECTORY, widget.folderPath)
+        }
+
+        val pendingIntent = PendingIntent.getActivity(context, widget.widgetId, intent, PendingIntent.FLAG_UPDATE_CURRENT)
+        views.setOnClickPendingIntent(id, pendingIntent)
+    }
+
+    override fun onUpdate(context: Context, appWidgetManager: AppWidgetManager, appWidgetIds: IntArray) {
+        super.onUpdate(context, appWidgetManager, appWidgetIds)
+        Thread {
+            context.widgetsDB.getWidgets().forEach {
+                val views = RemoteViews(context.packageName, R.layout.widget)
+                views.setBackgroundColor(R.id.widget_holder, context.config.widgetBgColor)
+                setupAppOpenIntent(context, views, R.id.widget_holder, it)
+                appWidgetManager.updateAppWidget(it.widgetId, views)
+            }
+        }.start()
+    }
+}

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

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/widget_holder"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <ImageView
+        android:id="@+id/widget_imageview"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:src="@mipmap/ic_launcher"/>
+
+</RelativeLayout>

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

@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/config_holder"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_centerHorizontal="true"
+    android:layout_margin="@dimen/activity_margin">
+
+    <RelativeLayout
+        android:id="@+id/config_image_holder"
+        android:layout_width="110dp"
+        android:layout_height="110dp"
+        android:padding="@dimen/activity_margin">
+
+        <ImageView
+            android:id="@+id/config_image"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"/>
+
+    </RelativeLayout>
+
+    <ImageView
+        android:id="@+id/config_bg_color"
+        android:layout_width="@dimen/widget_colorpicker_size"
+        android:layout_height="@dimen/widget_colorpicker_size"
+        android:layout_above="@+id/config_save"/>
+
+    <RelativeLayout
+        android:id="@+id/config_bg_seekbar_holder"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_alignTop="@+id/config_bg_color"
+        android:layout_alignBottom="@+id/config_bg_color"
+        android:layout_toEndOf="@+id/config_bg_color"
+        android:layout_toRightOf="@+id/config_bg_color"
+        android:background="@android:color/white">
+
+        <SeekBar
+            android:id="@+id/config_bg_seekbar"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_centerVertical="true"
+            android:paddingLeft="@dimen/activity_margin"
+            android:paddingRight="@dimen/activity_margin"/>
+    </RelativeLayout>
+
+    <Button
+        android:id="@+id/config_save"
+        android:layout_width="wrap_content"
+        android:layout_height="@dimen/widget_colorpicker_size"
+        android:layout_alignParentEnd="true"
+        android:layout_alignParentRight="true"
+        android:layout_alignParentBottom="true"
+        android:fontFamily="sans-serif-light"
+        android:paddingLeft="@dimen/activity_margin"
+        android:paddingRight="@dimen/activity_margin"
+        android:text="@string/ok"
+        android:textColor="@android:color/white"
+        android:textSize="@dimen/big_text_size"/>
+
+</RelativeLayout>

app/src/main/res/xml/widget_info.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<appwidget-provider
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:configure="com.simplemobiletools.gallery.pro.activities.WidgetConfigureActivity"
+    android:initialLayout="@layout/widget"
+    android:minWidth="40dp"
+    android:minHeight="40dp"
+    android:minResizeWidth="40dp"
+    android:minResizeHeight="40dp"
+    android:resizeMode="horizontal|vertical"/>