Set latitude and longitude in Exif, setAttribute() and saveAttributes().

To modify Exit tag, you can call the method setAttribute(), and call saveAttributes() to save the tags in Exif.

Note 1: You have to grant permission of "android.permission.WRITE_EXTERNAL_STORAGE", otherwise the tags cannot be saved - But no error return to inform you!

Note 2: In this example, the Android build-in Gallery App doesn't recognize the updated Exif GPS location. In order to force MediaStore re-scan the updated file, read here.



Modify main.xml to add a button to update Tags.

<?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"
   >
<TextView 
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="@string/hello"
   />
<ScrollView
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
>
<LinearLayout
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   >
<TextView 
   android:id="@+id/exif"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
<ImageView 
   android:id="@+id/image"
   android:layout_width="300dp"
   android:layout_height="300dp"
   />
<Button 
   android:id="@+id/update"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Update with dummy location"
   />
</LinearLayout>
</ScrollView>
</LinearLayout>

Implement UpdateExit() to update Exif Tags, with dummy LATITUDE and LONGITUDE.

package com.AndroidExif;

import java.io.IOException;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.ExifInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class AndroidExifActivity extends Activity {

String imagefile ="/sdcard/DCIM/DSC_9599.jpg";
ImageView image;
TextView Exif;
Button updateDummyLoc;

ExifInterface exifInterface;

   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       image = (ImageView)findViewById(R.id.image);
       Exif = (TextView)findViewById(R.id.exif);
      
       Bitmap bm = BitmapFactory.decodeFile(imagefile);
       image.setImageBitmap(bm);
      
       Exif.setText(ReadExif(imagefile));
      
       updateDummyLoc = (Button)findViewById(R.id.update);
       updateDummyLoc.setOnClickListener(new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   UpdateExit();
  }});
   }
  
   void UpdateExit(){
    String dummyLATITUDE = "0/1,16/1,5935883/125557";
    String dummyLATITUDE_REF = "N";
    String dummyLONGITUDE = "0/1,7/1,1429891026/483594097";
    String dummyLONGITUDE_REF = "E";
   
    exifInterface.setAttribute(ExifInterface.TAG_GPS_LATITUDE, dummyLATITUDE);
 exifInterface.setAttribute(ExifInterface.TAG_GPS_LATITUDE_REF, dummyLATITUDE_REF);
 exifInterface.setAttribute(ExifInterface.TAG_GPS_LONGITUDE, dummyLONGITUDE);
 exifInterface.setAttribute(ExifInterface.TAG_GPS_LONGITUDE_REF, dummyLONGITUDE_REF);

 try {
  exifInterface.saveAttributes();
  Toast.makeText(AndroidExifActivity.this,
    "saveAttribute finished",
    Toast.LENGTH_LONG).show();
 } catch (IOException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  Toast.makeText(AndroidExifActivity.this,
    e.toString(),
    Toast.LENGTH_LONG).show();
 }
   }
  
   String ReadExif(String file){
    String exif="Exif: " + file;
    try {
  exifInterface = new ExifInterface(file);

  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:";

  float[] LatLong = new float[2];
  if(exifInterface.getLatLong(LatLong)){
   exif += "\n latitude= " + LatLong[0];
   exif += "\n longitude= " + LatLong[1];
  }else{
   exif += "Exif tags are not available!";
  }
 
  Toast.makeText(AndroidExifActivity.this,
    "finished",
    Toast.LENGTH_LONG).show();
 
 } catch (IOException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  Toast.makeText(AndroidExifActivity.this,
    e.toString(),
    Toast.LENGTH_LONG).show();
 }
   
    return exif;
   }

}

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