In import com.nostra13.universalimageloader.core.assist.SimpleImageLoadingListener; SimpleImageLoadingLIstneer is not found <p>I am learning android and new to android. I want to pick multiple images from gallery and then want to show them in gridview and for that i am using UniversalImageLoader library 1.9.5</p> <p>To Use UniversalImageLoader Library i added the following dependency in build.gradle app module</p> <pre><code> compile 'com.nostra13.universalimageloader:universal-image-loader:1.9.5' </code></pre> <p>and then i copied and pasted the solution from some tutorial </p> <p>In This my mainactivity is like following in which i used universal image loader library </p> <pre><code>package tainning.infotech.lovely.selectmultipleimagesfromgallery; import java.util.ArrayList; import android.content.Context; import android.database.Cursor; import android.graphics.Bitmap; import android.os.Bundle; import android.provider.MediaStore; import android.util.Log; import android.util.SparseBooleanArray; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.animation.Animation; import android.view.animation.AnimationUtils; import android.widget.BaseAdapter; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.Toast; import android.widget.CompoundButton.OnCheckedChangeListener; import android.widget.GridView; import android.widget.ImageView; import com.nostra13.universalimageloader.core.DisplayImageOptions; import com.nostra13.universalimageloader.core.assist.SimpleImageLoadingListener; /** * @author Paresh Mayani (@pareshmayani) */ public class MainActivity extends BaseActivity { private ArrayList&lt;String&gt; imageUrls; private DisplayImageOptions options; private ImageAdapter imageAdapter; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.content_main); final String[] columns = { MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID }; final String orderBy = MediaStore.Images.Media.DATE_TAKEN; Cursor imagecursor = managedQuery( MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns, null, null, orderBy + " DESC"); this.imageUrls = new ArrayList&lt;String&gt;(); for (int i = 0; i &lt; imagecursor.getCount(); i++) { imagecursor.moveToPosition(i); int dataColumnIndex = imagecursor.getColumnIndex(MediaStore.Images.Media.DATA); imageUrls.add(imagecursor.getString(dataColumnIndex)); System.out.println("=====&gt; Array path =&gt; "+imageUrls.get(i)); } options = new DisplayImageOptions.Builder() .showStubImage(R.drawable.stub_image) .showImageForEmptyUri(R.drawable.image_for_empty_url) .cacheInMemory() .cacheOnDisc() .build(); imageAdapter = new ImageAdapter(this, imageUrls); GridView gridView = (GridView) findViewById(R.id.gridview); gridView.setAdapter(imageAdapter); /*gridView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView&lt;?&gt; parent, View view, int position, long id) { startImageGalleryActivity(position); } });*/ } @Override protected void onStop() { imageLoader.stop(); super.onStop(); } public void btnChoosePhotosClick(View v){ ArrayList&lt;String&gt; selectedItems = imageAdapter.getCheckedItems(); Toast.makeText(MainActivity.this, "Total photos selected: "+selectedItems.size(), Toast.LENGTH_SHORT).show(); Log.d(MainActivity.class.getSimpleName(), "Selected Items: " + selectedItems.toString()); } /*private void startImageGalleryActivity(int position) { Intent intent = new Intent(this, ImagePagerActivity.class); intent.putExtra(Extra.IMAGES, imageUrls); intent.putExtra(Extra.IMAGE_POSITION, position); startActivity(intent); }*/ public class ImageAdapter extends BaseAdapter { ArrayList&lt;String&gt; mList; LayoutInflater mInflater; Context mContext; SparseBooleanArray mSparseBooleanArray; public ImageAdapter(Context context, ArrayList&lt;String&gt; imageList) { // TODO Auto-generated constructor stub mContext = context; mInflater = LayoutInflater.from(mContext); mSparseBooleanArray = new SparseBooleanArray(); mList = new ArrayList&lt;String&gt;(); this.mList = imageList; } public ArrayList&lt;String&gt; getCheckedItems() { ArrayList&lt;String&gt; mTempArry = new ArrayList&lt;String&gt;(); for(int i=0;i&lt;mList.size();i++) { if(mSparseBooleanArray.get(i)) { mTempArry.add(mList.get(i)); } } return mTempArry; } @Override public int getCount() { return imageUrls.size(); } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { if(convertView == null) { convertView = mInflater.inflate(R.layout.row_multiphoto_item, null); } CheckBox mCheckBox = (CheckBox) convertView.findViewById(R.id.checkBox1); final ImageView imageView = (ImageView) convertView.findViewById(R.id.imageView1); imageLoader.displayImage("file://"+imageUrls.get(position), imageView, options, new SimpleImageLoadingListener() { @Override public void onLoadingComplete(Bitmap loadedImage) { Animation anim = AnimationUtils.loadAnimation(MainActivity.this,Animation.START_ON_FIRST_FRAME); imageView.setAnimation(anim); anim.start(); } }); mCheckBox.setTag(position); mCheckBox.setChecked(mSparseBooleanArray.get(position)); mCheckBox.setOnCheckedChangeListener(mCheckedChangeListener); return convertView; } OnCheckedChangeListener mCheckedChangeListener = new OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { // TODO Auto-generated method stub mSparseBooleanArray.put((Integer) buttonView.getTag(), isChecked); } }; } } but when i try to build the project it shows me the error following error Error:(26, 53) error: cannot find symbol class SimpleImageLoadingListener and also in following import statement import com.nostra13.universalimageloader.core.assist.SimpleImageLoadingListener; SimpleImageLoadingListener is underlined as red line. and it says cannot find symbol SimpleImageLoadingListener . The BaseActivity.java is following import android.app.Activity; import com.nostra13.universalimageloader.core.ImageLoader; /** * @author Paresh Mayani (@pareshmayani) */ public abstract class BaseActivity extends Activity { protected ImageLoader imageLoader = ImageLoader.getInstance(); } The UilApplication.java is like following package tainning.infotech.lovely.selectmultipleimagesfromgallery; /** * Created by student on 4/5/2016. */ import android.app.Application; import com.nostra13.universalimageloader.cache.disc.naming.Md5FileNameGenerator; import com.nostra13.universalimageloader.core.ImageLoader; import com.nostra13.universalimageloader.core.ImageLoaderConfiguration; /** * @author Paresh Mayani (@pareshmayani) */ public class UILApplication extends Application { @Override public void onCreate() { super.onCreate(); // This configuration tuning is custom. You can tune every option, you may tune some of them, // or you can create default configuration by // ImageLoaderConfiguration.createDefault(this); // method. ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(getApplicationContext()) .threadPoolSize(3) .threadPriority(Thread.NORM_PRIORITY - 2) .memoryCacheSize(1500000) // 1.5 Mb .denyCacheImageMultipleSizesInMemory() .discCacheFileNameGenerator(new Md5FileNameGenerator()) //.enableLogging() // Not necessary in common .build(); // Initialize ImageLoader with configuration. ImageLoader.getInstance().init(config); } } The manifest file is this &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="tainning.infotech.lovely.selectmultipleimagesfromgallery" &gt; &lt;!-- Include following permission if you load images from Internet --&gt; &lt;uses-permission android:name="android.permission.INTERNET" /&gt; &lt;!-- Include following permission if you want to cache images on SD card --&gt; &lt;uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /&gt; &lt;application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:supportsRtl="true" android:theme="@style/AppTheme" &gt; &lt;activity android:name=".MainActivity" android:label="@string/app_name" android:theme="@style/AppTheme.NoActionBar" &gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;/application&gt; &lt;/manifest&gt; Build.gradle(Module:app) is like this apply plugin: 'com.android.application' android { compileSdkVersion 23 buildToolsVersion "23.0.2" defaultConfig { applicationId "tainning.infotech.lovely.selectmultipleimagesfromgallery" minSdkVersion 15 targetSdkVersion 23 versionCode 1 versionName "1.0" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } } dependencies { compile fileTree(dir: 'libs', include: ['*.jar']) testCompile 'junit:junit:4.12' compile 'com.android.support:appcompat-v7:23.1.1' compile 'com.android.support:design:23.1.1' compile 'com.nostra13.universalimageloader:universal-image-loader:1.9.5' } Kindly help as soon as possible. </code></pre> <p>I searched for the solution of above problem but was not able to find any. I searched as much i can but didn't get the solution.</p> <pre><code>Thanks in advance </code></pre>