Thursday, April 27, 2017

Read Exif tag of JPG using ExifInterface(String filename)


Last posts show how to Read Exif tag of JPG using ExifInterface(FileDescriptor) and using ExifInterface(InputStream). But both ExifInterface(FileDescriptor) and ExifInterface(InputStream) added in API level 24, Android 7.0. In this post, I will show how to use ExifInterface(String filename), added in API level 5. Such that we can set Min Sdk Version to API 19.

To use ExifInterface(String filename), uses-permission of "android.permission.READ_EXTERNAL_STORAGE" is needed.

Beginning in Android 6.0 (API level 23), users grant permissions to apps while the app is running, not when they install the app. It need extra handle of Requesting Permissions at Run Time. To make it simple, we can set Target Sdk Version to API 22.


AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.blogspot.android_er.androidexif">

    <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>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

</manifest>

MainActivity.java
package com.blogspot.android_er.androidexif;

import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.ExifInterface;
import android.net.Uri;
import android.os.Bundle;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.io.FileNotFoundException;
import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    private static final int RQS_OPEN_IMAGE = 1;

    Button buttonOpen;
    TextView textUri;
    ImageView imageView;

    Uri targetUri = null;

    View.OnClickListener buttonOpenOnClickListener =
            new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    Intent intent = new Intent();
                    intent.setAction(Intent.ACTION_OPEN_DOCUMENT);
                    intent.addCategory(Intent.CATEGORY_OPENABLE);
                    intent.setType("image/jpeg");
                    startActivityForResult(intent, RQS_OPEN_IMAGE);
                }

            };
    View.OnClickListener textUriOnClickListener =
            new View.OnClickListener(){

                @Override
                public void onClick(View v) {
                    if (targetUri != null){
                        Bitmap bm;
                        try {
                            bm = BitmapFactory.decodeStream(
                                    getContentResolver()
                                            .openInputStream(targetUri));
                            imageView.setImageBitmap(bm);
                        } catch (FileNotFoundException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                }

            };

    View.OnClickListener imageOnClickListener =
            new View.OnClickListener(){

                @Override
                public void onClick(View view) {
                    showExif(targetUri);
                }
            };

    void showExif(Uri photoUri){
        if(photoUri != null){

            String photoPath = getRealPathFromURI(photoUri);

            try {
                /*
                ExifInterface (String filename) added in API level 5
                 */
                ExifInterface exifInterface = new ExifInterface(photoPath);

                String exif="Exif: ";
                exif += "\nIMAGE_LENGTH: " +
                        exifInterface.getAttribute(ExifInterface.TAG_IMAGE_LENGTH);
                exif += "\nIMAGE_WIDTH: " +
                        exifInterface.getAttribute(ExifInterface.TAG_IMAGE_WIDTH);
                exif += "\n DATETIME: " +
                        exifInterface.getAttribute(ExifInterface.TAG_DATETIME);
                exif += "\n TAG_MAKE: " +
                        exifInterface.getAttribute(ExifInterface.TAG_MAKE);
                exif += "\n TAG_MODEL: " +
                        exifInterface.getAttribute(ExifInterface.TAG_MODEL);
                exif += "\n TAG_ORIENTATION: " +
                        exifInterface.getAttribute(ExifInterface.TAG_ORIENTATION);
                exif += "\n TAG_WHITE_BALANCE: " +
                        exifInterface.getAttribute(ExifInterface.TAG_WHITE_BALANCE);
                exif += "\n TAG_FOCAL_LENGTH: " +
                        exifInterface.getAttribute(ExifInterface.TAG_FOCAL_LENGTH);
                exif += "\n TAG_FLASH: " +
                        exifInterface.getAttribute(ExifInterface.TAG_FLASH);
                exif += "\nGPS related:";
                exif += "\n TAG_GPS_DATESTAMP: " +
                        exifInterface.getAttribute(ExifInterface.TAG_GPS_DATESTAMP);
                exif += "\n TAG_GPS_TIMESTAMP: " +
                        exifInterface.getAttribute(ExifInterface.TAG_GPS_TIMESTAMP);
                exif += "\n TAG_GPS_LATITUDE: " +
                        exifInterface.getAttribute(ExifInterface.TAG_GPS_LATITUDE);
                exif += "\n TAG_GPS_LATITUDE_REF: " +
                        exifInterface.getAttribute(ExifInterface.TAG_GPS_LATITUDE_REF);
                exif += "\n TAG_GPS_LONGITUDE: " +
                        exifInterface.getAttribute(ExifInterface.TAG_GPS_LONGITUDE);
                exif += "\n TAG_GPS_LONGITUDE_REF: " +
                        exifInterface.getAttribute(ExifInterface.TAG_GPS_LONGITUDE_REF);
                exif += "\n TAG_GPS_PROCESSING_METHOD: " +
                        exifInterface.getAttribute(ExifInterface.TAG_GPS_PROCESSING_METHOD);

                Toast.makeText(getApplicationContext(),
                        exif,
                        Toast.LENGTH_LONG).show();


            } catch (FileNotFoundException e) {
                e.printStackTrace();
                Toast.makeText(getApplicationContext(),
                        "Something wrong:\n" + e.toString(),
                        Toast.LENGTH_LONG).show();
            } catch (IOException e) {
                e.printStackTrace();
                Toast.makeText(getApplicationContext(),
                        "Something wrong:\n" + e.toString(),
                        Toast.LENGTH_LONG).show();
            }

        }else{
            Toast.makeText(getApplicationContext(),
                    "photoUri == null",
                    Toast.LENGTH_LONG).show();
        }
    };

    /*
    This method getRealPathFromURI() is not coded by me,
    but I forgot where I copy it from.
     */
    private String getRealPathFromURI(Uri uri){
        String filePath = "";
        String wholeID = DocumentsContract.getDocumentId(uri);

        // Split at colon, use second item in the array
        String id = wholeID.split(":")[1];

        String[] column = { MediaStore.Images.Media.DATA };

        // where id is equal to
        String sel = MediaStore.Images.Media._ID + "=?";

        Cursor cursor = getApplicationContext().getContentResolver()
                .query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                        column, sel, new String[]{ id }, null);

        int columnIndex = cursor.getColumnIndex(column[0]);

        if (cursor.moveToFirst()) {
            filePath = cursor.getString(columnIndex);
        }
        cursor.close();
        return filePath;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        buttonOpen = (Button) findViewById(R.id.opendocument);
        buttonOpen.setOnClickListener(buttonOpenOnClickListener);

        textUri = (TextView) findViewById(R.id.texturi);
        textUri.setOnClickListener(textUriOnClickListener);

        imageView = (ImageView)findViewById(R.id.image);
        imageView.setOnClickListener(imageOnClickListener);
    }

    protected void onActivityResult(int requestCode,
                                    int resultCode, Intent data) {

        if (resultCode == Activity.RESULT_OK) {

            Uri dataUri = data.getData();

            if (requestCode == RQS_OPEN_IMAGE) {
                targetUri = dataUri;
                textUri.setText(dataUri.toString());
                imageView.setImageBitmap(null);
            }
        }

    }
}


For the layout, refer to the example in Read Exif tag of JPG using ExifInterface(FileDescriptor).