Importing Image From Gallery

In this tutorial I want to explain how to import images from Gallery to am imageview,

In this I am having One Button and One ImageView. While Tap on the button it will redirect to Gallery to Browse image. While we select an image it will display on the Imageview.

activity_main.xml

This is a Layout of main page. This layout contain One Button and one Imageview.

<LinearLayout 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"
    android:gravity="top|center"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/BtnSelectImg"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Insert Image" />

    <ImageView
        android:id="@+id/ImgPhoto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/ic_launcher" />

</LinearLayout>

MainActivity.java


import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.media.ExifInterface;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore.Images;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity {
   
    private static final int PICTURE_GALLERY_REQUEST = 22;

    Uri cameraUri;
   
    Button BtnSelectImage;
    private ImageView ImgPhoto;
    private String Camerapath ;
   
   
   
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       
        ImgPhoto = (ImageView) findViewById(R.id.ImgPhoto);
       
        BtnSelectImage = (Button) findViewById(R.id.BtnSelectImg);
        BtnSelectImage.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                // TODO Auto-generated method stub
                Intent photoPickerIntent = new Intent(Intent.ACTION_GET_CONTENT, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                  photoPickerIntent.setType("image/*");
                  startActivityForResult(photoPickerIntent, PICTURE_GALLERY_REQUEST);
            }
        });
       
    }
   
   
    @Override
    public void onActivityResult(final int requestCode, int resultCode, Intent data) {
        try {
            switch (requestCode) {
            case PICTURE_GALLERY_REQUEST:
                if (resultCode == RESULT_OK) {
                    try {
                        Uri selectedImage = data.getData();
                        ImgPhoto.setImageBitmap(decodeUri(selectedImage));
                    } catch (Exception e) {
                        Toast.makeText(this, "Couldn't load photo", Toast.LENGTH_LONG).show();
                    }
                }
                break;
              default:
                break;
            }
        } catch (Exception e) {
        }
    }
    
   

     private Bitmap decodeUri(Uri selectedImage) throws FileNotFoundException {
         BitmapFactory.Options o = new BitmapFactory.Options();
         o.inJustDecodeBounds = true;
         BitmapFactory.decodeStream(
                 getContentResolver().openInputStream(selectedImage), null, o);

         final int REQUIRED_SIZE = 100;

         int width_tmp = o.outWidth, height_tmp = o.outHeight;
         int scale = 1;
         while (true) {
             if (width_tmp / 2 < REQUIRED_SIZE || height_tmp / 2 < REQUIRED_SIZE) {
                 break;
             }
             width_tmp /= 2;
             height_tmp /= 2;
             scale *= 2;
         }

         BitmapFactory.Options o2 = new BitmapFactory.Options();
         o2.inSampleSize = scale;
         //return BitmapFactory.decodeStream(getContentResolver().openInputStream(selectedImage), null, o2);
         Bitmap b = BitmapFactory.decodeStream(getContentResolver().openInputStream(selectedImage), null, o2);
         Matrix matrix = new Matrix();
         float rotation = rotationForImage(getApplicationContext(), selectedImage);
         if (rotation != 0f) {
               matrix.preRotate(rotation);
          }
         Bitmap resizedBitmap = Bitmap.createBitmap(
                 b, 0, 0, width_tmp, height_tmp, matrix, true);
         return resizedBitmap;
     }
    
    
     public static float rotationForImage(Context context, Uri uri) {
        if (uri.getScheme().equals("content")) {
        String[] projection = { Images.ImageColumns.ORIENTATION };
        Cursor c = context.getContentResolver().query(
                uri, projection, null, null, null);
        if (c.moveToFirst()) {
            return c.getInt(0);
        }
    } else if (uri.getScheme().equals("file")) {
        try {
            ExifInterface exif = new ExifInterface(uri.getPath());
            int rotation = (int)exifOrientationToDegrees(
                    exif.getAttributeInt(ExifInterface.TAG_ORIENTATION,
                            ExifInterface.ORIENTATION_NORMAL));
            return rotation;
        } catch (IOException e) {
            Log.e("Photo Import", "Error checking exif", e);
        }
    }
        return 0f;
    }

    private static float exifOrientationToDegrees(int exifOrientation) {
    if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_90) {
        return 90;
    } else if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_180) {
        return 180;
    } else if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_270) {
        return 270;
    }
    return 0;
    }
   
}