Background ListView becomes black when scrolling in Android?

AndroidMobile DevelopmentProgramming

Before getting into listview example, we should know about listview, Listview is a collection of items pulled from arraylist, list or any databases. Most uses of listview is a collection of items in vertical format, we can scroll up/down and click on any item.

Here is the simple solution to avoid Background ListView becomes black when scrolling.

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<?xml version = "1.0" encoding = "utf-8"?>
<android.support.constraint.ConstraintLayout
   xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent"
   android:layout_height = "match_parent">
   <LinearLayout
      android:layout_width = "match_parent"
      android:layout_height = "match_parent"
      android:orientation = "vertical">
      <ListView
         android:id = "@+id/list"
         android:layout_width = "wrap_content"
         android:layout_height = "wrap_content"
         android:cacheColorHint = "#00000000"/>
   </LinearLayout>
</android.support.constraint.ConstraintLayout>

In the above activity_main.xml, we have declared a listview. To avoid background listview becomes black when scrolling, we have to add cache colorhint to listview as shown below.

<ListView
   android:id = "@+id/list"
   android:layout_width = "wrap_content"
   android:layout_height = "wrap_content"
   android:cacheColorHint = "#00000000"/>

Step 3 − Add the following code to src/MainActivity.java.

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      final ListView list = findViewById(R.id.list);
      ArrayList<String> arrayList = new ArrayList<>();
      arrayList.add("JAVA");
      arrayList.add("ANDROID");
      arrayList.add("C Language");
      arrayList.add("CPP Language");
      arrayList.add("Go Language");
      arrayList.add("AVN SYSTEMS");
      arrayList.add("JAVA");
      arrayList.add("ANDROID");
      arrayList.add("C Language");
      arrayList.add("CPP Language");
      arrayList.add("Go Language");
      arrayList.add("AVN SYSTEMS");
      arrayList.add("JAVA");
      arrayList.add("ANDROID");
      arrayList.add("C Language");
      arrayList.add("CPP Language");
      arrayList.add("Go Language");
      arrayList.add("AVN SYSTEMS");
      arrayList.add("JAVA");
      arrayList.add("ANDROID");
      arrayList.add("C Language");
      arrayList.add("CPP Language");
      arrayList.add("Go Language");
      arrayList.add("AVN SYSTEMS");
      ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, arrayList);
      list.setAdapter(arrayAdapter);
      list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
         @Override
         public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            String clickedItem = (String) list.getItemAtPosition(position);
            Toast.makeText(MainActivity.this, clickedItem, Toast.LENGTH_LONG).show();
         }
      });
   }
}

In the mainActivity, we have stored list items in arraylist and added array to listview as shown below.

ArrayAdapter <String> arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, arrayList);
list.setAdapter(arrayAdapter);

When you click on the list item it will shown name of the items for that we have added onItemclickListener as shown below.

list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
   @Override
   public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
      String clickedItem = (String) list.getItemAtPosition(position);
      Toast.makeText(MainActivity.this,clickedItem,Toast.LENGTH_LONG).show();
   }
});

No need to change manifest file . Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click RunPlay Icon  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen.

Color Issue

Now Scroll the listview, you wont get any background color issue as shown below −

BackGround Color
raja
Published on 05-Dec-2018 07:50:12
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