How to pick an image from image gallery in Android?

This example demonstrates how do I pick an image from image gallery in android app
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"?>
<LinearLayout
   xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent">
   <ImageView
      android:id="@+id/imageView"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:layout_weight="1"/>
   <Button
      android:id="@+id/buttonLoadPicture"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_weight="0"
      android:text="Load Picture"
      android:layout_gravity="center"/>
</LinearLayout>
Step 3 − Add the following code to src/MainActivity.java
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
public class MainActivity extends Activity {
   ImageView imageView;
   Button button;
   private static final int PICK_IMAGE = 100;
   Uri imageUri;
   @Override
   public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      imageView = (ImageView)findViewById(R.id.imageView);
      button = (Button)findViewById(R.id.buttonLoadPicture);
      button.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            openGallery();
         }
      });
   }
   private void openGallery() {
      Intent gallery = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
      startActivityForResult(gallery, PICK_IMAGE);
   }
   @Override
   protected void onActivityResult(int requestCode, int resultCode, Intent data){
      super.onActivityResult(requestCode, resultCode, data);
      if (resultCode == RESULT_OK && requestCode == PICK_IMAGE){
         imageUri = data.getData();
         imageView.setImageURI(imageUri);
      }
   }
}
Step 4 − Add the following code to androidManifest.xm
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample">
   <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
      <activity android:name=".MainActivity">
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>
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 Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −
Click here to download the project code.