以与Android的照片，显示的元数据

问题描述：

我写一个应用程序，拍照，然后显示其元数据的形象，这是我到目前为止有：以与Android的照片，显示的元数据

<?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"> 
     <Button 
      android:id="@+id/button1" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:text="@string/openCamera" /> 
     <ImageView 
      android:src="@android:drawable/ic_menu_gallery" 
      android:layout_width="fill_parent" 
      android:layout_height="300.0dp" 
      android:id="@+id/imageView1" 
      android:adjustViewBounds="true" /> 
     </LinearLayout>

这里是我的活动：

import java.io.File; 
    import java.io.FileOutputStream; 
    import java.io.IOException; 
    import java.util.Calendar; 

    import android.app.Activity; 
    import android.content.Intent; 
    import android.graphics.Bitmap; 
    import android.graphics.BitmapFactory; 
    import android.graphics.Camera; 
    import android.graphics.Matrix; 
    import android.media.ExifInterface; 
    import android.os.Bundle; 
    import android.util.Log; 
    import android.view.SurfaceHolder; 
    import android.view.View; 
    import android.widget.Button; 
    import android.widget.ImageView; 

    public class MainActivity extends Activity { 
     private static final int CAMERA_REQUEST = 1888; 
     private ImageView imageView; 

     @Override 
     public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_main); 
      this.imageView = (ImageView)this.findViewById(R.id.imageView1); 
      Button photoButton = (Button) this.findViewById(R.id.button1); 
      photoButton.setOnClickListener(new View.OnClickListener() { 

       @Override 
       public void onClick(View v) { 
        Intent cameraIntent = new    Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
      startActivityForResult(cameraIntent, CAMERA_REQUEST); 
     } 
    }); 
} 

protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) { 
     Bitmap photo = (Bitmap) data.getExtras().get("data"); 
     imageView.setImageBitmap(photo); 
    } 

    ExifInterface exif = new ExifInterface(imgFile.getCanonicalPath()); 
    //String latitudeStr = "90/1,12/1,30/1"; 
    double lat = location.getLatitude(); 
    double alat = Math.abs(lat); 
    String dms = Location.convert(alat, Location.FORMAT_SECONDS); 
    String[] splits = dms.split(":"); 
    String[] secnds = (splits[2]).split("\\."); 
    String seconds; 
    if(secnds.length==0) 
    { 
     seconds = splits[2]; 
    } 
    else 
    { 
     seconds = secnds[0]; 
    } 

    String latitudeStr = splits[0] + "/1," + splits[1] + "/1," + seconds + "/1"; 
    exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE, latitudeStr); 

    exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE_REF, lat>0?"N":"S"); 

    double lon = location.getLongitude(); 
    double alon = Math.abs(lon); 


    dms = Location.convert(alon, Location.FORMAT_SECONDS); 
    splits = dms.split(":"); 
    secnds = (splits[2]).split("\\."); 

    if(secnds.length==0) 
    { 
     seconds = splits[2]; 
    } 
    else 
    { 
     seconds = secnds[0]; 
    } 
    String longitudeStr = splits[0] + "/1," + splits[1] + "/1," + seconds + "/1"; 


    exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE, longitudeStr); 
    exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE_REF, lon>0?"E":"W"); 

    exif.saveAttributes(); 

} 
      ExifInterface exif = new ExifInterface(imgFile.getCanonicalPath()); 
      //String latitudeStr = "90/1,12/1,30/1"; 
      double lat = location.getLatitude(); 
      double alat = Math.abs(lat); 
      String dms = Location.convert(alat, Location.FORMAT_SECONDS); 
      String[] splits = dms.split(":"); 
      String[] secnds = (splits[2]).split("\\."); 
      String seconds; 
      if(secnds.length==0) 
      { 
       seconds = splits[2]; 
      } 
      else 
      { 
       seconds = secnds[0]; 
      } 

      String latitudeStr = splits[0] + "/1," + splits[1] + "/1," + seconds + "/1"; 
      exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE, latitudeStr); 

      exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE_REF, lat>0?"N":"S"); 

      double lon = location.getLongitude(); 
      double alon = Math.abs(lon); 


      dms = Location.convert(alon, Location.FORMAT_SECONDS); 
      splits = dms.split(":"); 
      secnds = (splits[2]).split("\\."); 

      if(secnds.length==0) 
      { 
       seconds = splits[2]; 
      } 
      else 
      { 
       seconds = secnds[0]; 
      } 
      String longitudeStr = splits[0] + "/1," + splits[1] + "/1," + seconds + "/1"; 


      exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE, longitudeStr); 
      exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE_REF, lon>0?"E":"W"); 

      exif.saveAttributes(); 

     } 

    }

我收到了imgFile的错误信息，并显示位置和位置信息，说所有3都无法解析。任何想法我编码错了？我能做些什么来完成这项工作？谢谢！

答

事实上，你并没有在onActivityResult（）中定义imgFile或location。

还需要导入地点：

import android.location.Location;

，需要从获得的LocationManager获得位置：

Context.getSystemService(Context.LOCATION_SERVICE);

以与Android的照片，显示的元数据

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