Android GridView ขอความช่วยเหลือ ด้วยครับ เกี่ยวกับการแชร์รูปfacebook

public class ImageAdapter extends BaseAdapter {
private Context context;
ImageView imageview;

public ImageAdapter(Context context) {
    this.context = context;
}

@Override
public int getCount() {
    return getImageSD().length;
}

@Override
public Object getItem(int i) {
    return null;
}

@Override
public long getItemId(int i) {
    return 0;
}

@Override
public View getView(final int position, View convertView, ViewGroup viewGroup) {
    if (convertView == null) {
        imageview = new ImageView(context);
        imageview.setPadding(8, 8, 8, 8);
        imageview.setLayoutParams(new GridView.LayoutParams(85, 80));

        imageview.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(context, "position[" + position + "]", Toast.LENGTH_SHORT).show();
                Intent i = new Intent(context, DisplayImageActivity.class);
                i.putExtra("imgId", path[position]);
                context.startActivity(i);
            }
        });

    }else{
        imageview=(ImageView)convertView;
    }
    imageview.setImageURI(getImageSD()[position]);
    return imageview;
}

Uri[]uri;
String[] path=null;

public Uri[] getImageSD(){
    File file = new File(
            android.os.Environment.getExternalStorageDirectory()
                    + File.separator + AppConstant.PHOTO_ALBUM);
    File[] filelist = file.listFiles(new FilenameFilter() {
        @Override
        public boolean accept(File dir, String name) {
            return ((name.endsWith(".jpg")||(name.endsWith(".png")||(name.endsWith(".bmp")))));
        }
    });
    path = new String[filelist.length];
    for(int i=0;i<filelist.length;i++){
        path[i]=filelist[i].getAbsolutePath();

    }
    uri=new Uri[path.length];
    for(int q=0;q<path.length;q++){
        uri[q]=Uri.parse(path[q]);

    }
    return uri;
}

public class DisplayImageActivity  extends Activity {
Button buttontest;
private Utils utils;

private ViewPager viewPager;
public CallbackManager callbackManager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);


    setContentView(R.layout.full_photo);
    FacebookSdk.sdkInitialize(getApplicationContext());
    callbackManager = CallbackManager.Factory.create();
    final List<String> permissionNeeds = Arrays.asList("publish_actions");
    //this loginManager helps you eliminate adding a LoginButton to your UI
    final LoginManager manager = LoginManager.getInstance();

    manager.logInWithPublishPermissions(this, permissionNeeds);

    Bundle bundle=getIntent().getExtras();
    //int imgId =bundle.getInt();
    String imageId=bundle.getString("imgId");
    final Uri uri=Uri.parse(imageId);
    ImageView image=(ImageView)findViewById(R.id.ImageView1);
    image.setImageURI(uri);
    //image.setImageResource();
    Button btnclose = (Button)findViewById(R.id.btnClose);
    btnclose.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            finish();
        }
    });
    buttontest=(Button)findViewById(R.id.btnShared);
    buttontest.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            manager.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
                @Override
                public void onSuccess(LoginResult loginResult) {
                    sharedPhoto();
                }

                @Override
                public void onCancel() {
                    Toast.makeText(getApplicationContext(), "Cancle", Toast.LENGTH_SHORT).show();
                    System.out.println("onCancel");
                }

                @Override
                public void onError(FacebookException exception) {
                    System.out.println("onError");
                }
            });


            // Toast.makeText(getApplicationContext(), "position[" + uri + "]", Toast.LENGTH_SHORT).show();
        }
    });







}


public void sharedPhoto(){

   /* Bundle bundle=getIntent().getExtras();
    String imageId2=bundle.getString("imgId");
    Uri uri2=Uri.parse(imageId2);*/
    Bitmap image = BitmapFactory.decodeResource(getResources(), R.drawable.shared_icon);
    SharePhoto photo = new SharePhoto.Builder()
            .setBitmap(image)
            .setCaption("Test FaceBook Api My Apps")
            .build();

    SharePhotoContent content = new SharePhotoContent.Builder()
            .addPhoto(photo)
            .build();
    ShareApi.share(content, null);
}
@Override
protected void onActivityResult(final int requestCode, final int resultCode, final Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    callbackManager.onActivityResult(requestCode, resultCode, data);
}