add a button for clearing clipboard data

app/src/main/kotlin/com/simplemobiletools/keyboard/views/MyKeyboardView.kt

@@ -1,6 +1,7 @@
 package com.simplemobiletools.keyboard.views
 
 import android.annotation.SuppressLint
+import android.content.ClipData
 import android.content.ClipboardManager
 import android.content.Context
 import android.graphics.*
@@ -16,9 +17,11 @@ import android.util.TypedValue
 import android.view.*
 import android.view.accessibility.AccessibilityEvent
 import android.view.accessibility.AccessibilityManager
+import android.view.animation.AccelerateInterpolator
 import android.widget.PopupWindow
 import android.widget.TextView
 import com.simplemobiletools.commons.extensions.*
+import com.simplemobiletools.commons.helpers.isPiePlus
 import com.simplemobiletools.keyboard.R
 import com.simplemobiletools.keyboard.extensions.config
 import com.simplemobiletools.keyboard.helpers.*
@@ -406,32 +409,7 @@ class MyKeyboardView @JvmOverloads constructor(context: Context, attrs: Attribut
 
         canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR)
 
-        if (context.config.showClipboard && mClipboardHolder != null && mPopupParent.id != R.id.mini_keyboard_view) {
-            val clipboardContent = (context.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager).primaryClip?.getItemAt(0)?.text
-            if (clipboardContent?.trim()?.isNotEmpty() == true) {
-                val rippleBg = resources.getDrawable(R.drawable.clipboard_background, context.theme) as RippleDrawable
-                val layerDrawable = rippleBg.findDrawableByLayerId(R.id.clipboard_background_holder) as LayerDrawable
-                layerDrawable.findDrawableByLayerId(R.id.clipboard_background_shape).applyColorFilter(mBackgroundColor)
-
-                mClipboardHolder?.apply {
-                    background = ColorDrawable(mBackgroundColor.darkenColor())
-                    beVisible()
-                    clipboard_value.apply {
-                        text = clipboardContent
-                        background = rippleBg
-                        setTextColor(mTextColor)
-                        setOnClickListener {
-                            mOnKeyboardActionListener!!.onText(clipboardContent.toString())
-                        }
-                    }
-                }
-            } else {
-                mClipboardHolder?.beGone()
-            }
-        } else {
-            mClipboardHolder?.beGone()
-        }
-
+        handleClipboard()
         val keyCount = keys.size
         for (i in 0 until keyCount) {
             val key = keys[i]
@@ -525,6 +503,59 @@ class MyKeyboardView @JvmOverloads constructor(context: Context, attrs: Attribut
         mDirtyRect.setEmpty()
     }
 
+    private fun handleClipboard() {
+        if (context.config.showClipboard && mClipboardHolder != null && mPopupParent.id != R.id.mini_keyboard_view) {
+            val clipboardContent = (context.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager).primaryClip?.getItemAt(0)?.text
+            if (clipboardContent?.trim()?.isNotEmpty() == true) {
+                val rippleBg = resources.getDrawable(R.drawable.clipboard_background, context.theme) as RippleDrawable
+                val layerDrawable = rippleBg.findDrawableByLayerId(R.id.clipboard_background_holder) as LayerDrawable
+                layerDrawable.findDrawableByLayerId(R.id.clipboard_background_shape).applyColorFilter(mBackgroundColor)
+
+                mClipboardHolder?.apply {
+                    background = ColorDrawable(mBackgroundColor.darkenColor())
+                    beVisible()
+                    clipboard_value.apply {
+                        text = clipboardContent
+                        background = rippleBg
+                        setTextColor(mTextColor)
+                        setOnClickListener {
+                            mOnKeyboardActionListener!!.onText(clipboardContent.toString())
+                        }
+                    }
+
+                    clipboard_delete.applyColorFilter(mTextColor)
+                    clipboard_delete.setOnLongClickListener { context.toast(R.string.clear_clipboard_data); true; }
+                    clipboard_delete.setOnClickListener {
+                        clearClipboardContent()
+                    }
+                }
+            } else {
+                mClipboardHolder?.beGone()
+            }
+        } else {
+            mClipboardHolder?.beGone()
+        }
+    }
+
+    private fun clearClipboardContent() {
+        val clipboardManager = (context.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager)
+        if (isPiePlus()) {
+            clipboardManager.clearPrimaryClip()
+        } else {
+            val clip = ClipData.newPlainText("", "")
+            clipboardManager.setPrimaryClip(clip)
+        }
+
+        mClipboardHolder?.animate()!!
+            .yBy(mClipboardHolder!!.height.toFloat())
+            .setInterpolator(AccelerateInterpolator())
+            .setDuration(200)
+            .withEndAction {
+                mClipboardHolder?.beGone()
+                mClipboardHolder?.y = mClipboardHolder!!.y - mClipboardHolder!!.height
+            }.start()
+    }
+
     private fun getKeyIndices(x: Int, y: Int, allKeys: IntArray?): Int {
         val keys = mKeys
         var primaryIndex = NOT_A_KEY

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

@@ -1,4 +1,5 @@
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/keyboard_holder"
     android:layout_width="match_parent"
@@ -6,18 +7,18 @@
     android:layout_alignParentBottom="true"
     android:orientation="vertical">
 
-    <RelativeLayout
+    <androidx.constraintlayout.widget.ConstraintLayout
         android:id="@+id/clipboard_holder"
         android:layout_width="match_parent"
         android:layout_height="@dimen/clipboard_height"
-        android:gravity="center"
-        android:paddingStart="@dimen/big_margin"
-        android:paddingEnd="@dimen/big_margin">
+        android:gravity="center_vertical">
 
         <TextView
             android:id="@+id/clipboard_value"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
+            android:layout_marginStart="@dimen/activity_margin"
+            android:layout_marginEnd="@dimen/medium_margin"
             android:background="@drawable/clipboard_background"
             android:ellipsize="end"
             android:lines="1"
@@ -26,9 +27,26 @@
             android:paddingEnd="@dimen/activity_margin"
             android:paddingBottom="@dimen/smaller_margin"
             android:textSize="@dimen/label_text_size"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toStartOf="@+id/clipboard_delete"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent"
             tools:text="Clipboard content" />
 
-    </RelativeLayout>
+        <ImageView
+            android:id="@+id/clipboard_delete"
+            android:layout_width="@dimen/list_avatar_size"
+            android:layout_height="@dimen/list_avatar_size"
+            android:layout_marginEnd="@dimen/medium_margin"
+            android:background="?android:attr/selectableItemBackgroundBorderless"
+            android:contentDescription="@string/clear_clipboard_data"
+            android:padding="@dimen/medium_margin"
+            android:src="@drawable/ic_delete_vector"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
 
     <com.simplemobiletools.keyboard.views.MyKeyboardView
         android:id="@+id/keyboard_view"