set banner as default toolbar image

app/build.gradle

@@ -30,7 +30,7 @@ dependencies {
 
     implementation 'androidx.appcompat:appcompat:1.2.0'
     implementation 'com.google.android.material:material:1.2.0'
-    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.1'
     implementation 'androidx.navigation:navigation-fragment:2.3.0'
     implementation 'androidx.navigation:navigation-ui:2.3.0'
 

app/src/main/java/com/akdev/nofbeventscraper/MainActivity.java

@@ -6,6 +6,7 @@ import android.content.Intent;
 import android.net.Uri;
 import android.os.Bundle;
 
+import com.google.android.material.appbar.AppBarLayout;
 import com.google.android.material.appbar.CollapsingToolbarLayout;
 import com.google.android.material.textfield.TextInputEditText;
 import androidx.appcompat.app.AppCompatActivity;
@@ -66,6 +67,28 @@ public class MainActivity extends AppCompatActivity {
 
         ok_button.setEnabled(false);
 
+        toolbar_image_view.setImageResource(R.drawable.ic_banner_foreground);
+
+        AppBarLayout app_bar_layout = (AppBarLayout) findViewById(R.id.app_bar);
+        app_bar_layout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
+            boolean isShow = true;
+            int scrollRange = -1;
+
+            @Override
+            public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
+                if (scrollRange == -1) {
+                    scrollRange = appBarLayout.getTotalScrollRange();
+                }
+                if (scrollRange + verticalOffset == 0) {
+                    toolbar_layout.setTitle(getString(R.string.app_name));
+                    isShow = true;
+                } else if(isShow) {
+                    toolbar_layout.setTitle(" ");
+                    isShow = false;
+                }
+            }
+        });
+
         paste_button.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
@@ -259,14 +282,13 @@ public class MainActivity extends AppCompatActivity {
         field_event_description.setError(null);
         toolbar_image_view.setImageDrawable(null);
 
-        toolbar_layout.setTitle(getString(R.string.app_name));
-
         if (scraper!=null)
         {
             scraper.cancel(true);
             scraper = null;
         }
         ok_button.setEnabled(false);
+        toolbar_image_view.setImageResource(R.drawable.ic_banner_foreground);
     }
 
     public void update(FbEvent event) {
@@ -306,7 +328,6 @@ public class MainActivity extends AppCompatActivity {
 
         try {
             Picasso.get().load(event.image_url).into(toolbar_image_view);
-            toolbar_layout.setTitle(" ");
         } catch (Exception e)
         {
             e.printStackTrace();

app/src/main/res/drawable/ic_icon.xml

@@ -1,58 +0,0 @@
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="642dp"
-    android:height="642dp"
-    android:viewportWidth="642"
-    android:viewportHeight="642">
-  <path
-      android:pathData="M0.5,0.5h640v640h-640z"
-      android:fillColor="#ffffff"
-      android:strokeColor="#00000000"/>
-  <path
-      android:pathData="M0.5,120.5h640v410h-640z"
-      android:fillColor="#297da6"
-      android:strokeColor="#00000000"/>
-  <path
-      android:pathData="M6.5,40.5L634.5,40.5A6,6 0,0 1,640.5 46.5L640.5,134.5A6,6 0,0 1,634.5 140.5L6.5,140.5A6,6 0,0 1,0.5 134.5L0.5,46.5A6,6 0,0 1,6.5 40.5z"
-      android:fillColor="#74b42b"
-      android:strokeColor="#00000000"/>
-  <path
-      android:pathData="M519.5,0.5L561.5,0.5A9,9 0,0 1,570.5 9.5L570.5,101.5A9,9 0,0 1,561.5 110.5L519.5,110.5A9,9 0,0 1,510.5 101.5L510.5,9.5A9,9 0,0 1,519.5 0.5z"
-      android:fillColor="#ffffff"
-      android:strokeColor="#00000000"/>
-  <path
-      android:pathData="M399.5,0.5L441.5,0.5A9,9 0,0 1,450.5 9.5L450.5,101.5A9,9 0,0 1,441.5 110.5L399.5,110.5A9,9 0,0 1,390.5 101.5L390.5,9.5A9,9 0,0 1,399.5 0.5z"
-      android:fillColor="#ffffff"
-      android:strokeColor="#00000000"/>
-  <path
-      android:pathData="M199.5,0.5L241.5,0.5A9,9 0,0 1,250.5 9.5L250.5,101.5A9,9 0,0 1,241.5 110.5L199.5,110.5A9,9 0,0 1,190.5 101.5L190.5,9.5A9,9 0,0 1,199.5 0.5z"
-      android:fillColor="#ffffff"
-      android:strokeColor="#00000000"/>
-  <path
-      android:pathData="M79.5,0.5L121.5,0.5A9,9 0,0 1,130.5 9.5L130.5,101.5A9,9 0,0 1,121.5 110.5L79.5,110.5A9,9 0,0 1,70.5 101.5L70.5,9.5A9,9 0,0 1,79.5 0.5z"
-      android:fillColor="#ffffff"
-      android:strokeColor="#00000000"/>
-  <path
-      android:pathData="M526.5,10.5L554.5,10.5A6,6 0,0 1,560.5 16.5L560.5,94.5A6,6 0,0 1,554.5 100.5L526.5,100.5A6,6 0,0 1,520.5 94.5L520.5,16.5A6,6 0,0 1,526.5 10.5z"
-      android:fillColor="#42a3d2"
-      android:strokeColor="#00000000"/>
-  <path
-      android:pathData="M406.5,10.5L434.5,10.5A6,6 0,0 1,440.5 16.5L440.5,94.5A6,6 0,0 1,434.5 100.5L406.5,100.5A6,6 0,0 1,400.5 94.5L400.5,16.5A6,6 0,0 1,406.5 10.5z"
-      android:fillColor="#42a3d2"
-      android:strokeColor="#00000000"/>
-  <path
-      android:pathData="M86.5,10.5L114.5,10.5A6,6 0,0 1,120.5 16.5L120.5,94.5A6,6 0,0 1,114.5 100.5L86.5,100.5A6,6 0,0 1,80.5 94.5L80.5,16.5A6,6 0,0 1,86.5 10.5z"
-      android:fillColor="#42a3d2"
-      android:strokeColor="#00000000"/>
-  <path
-      android:pathData="M206.5,10.5L234.5,10.5A6,6 0,0 1,240.5 16.5L240.5,94.5A6,6 0,0 1,234.5 100.5L206.5,100.5A6,6 0,0 1,200.5 94.5L200.5,16.5A6,6 0,0 1,206.5 10.5z"
-      android:fillColor="#42a3d2"
-      android:strokeColor="#00000000"/>
-  <path
-      android:pathData="M9.5,490.5L631.5,490.5A9,9 0,0 1,640.5 499.5L640.5,631.5A9,9 0,0 1,631.5 640.5L9.5,640.5A9,9 0,0 1,0.5 631.5L0.5,499.5A9,9 0,0 1,9.5 490.5z"
-      android:fillColor="#297da6"
-      android:strokeColor="#00000000"/>
-  <path
-      android:pathData="M155.5,295.5L281.94,295.5L320.5,174.5L359.06,295.5L485.5,295.5L384.76,376.53L424.71,504.5L320.5,425.3L216.29,504.5L256.24,376.53Z"
-      android:fillColor="#ffffff"
-      android:strokeColor="#00000000"/>
-</vector>