Question

我使用facebook的图形api来安卓android。我无法从GraphRequest（[...]）中获取任何值.executeAsync（）。所以返回字符串总是空的

private uploadPostImage(String imagePath) throws Exception {
    String orientation = "Portrait";
    Bitmap bm = null;
    try {
        bm = checkForRotation(imagePath);
        if (bm.getHeight() > bm.getWidth()) {
            orientation = "Portrait";
        } else if (bm.getWidth() > bm.getHeight()) {
            orientation = "Landscape";
        } else {
            orientation = "Portrait";
        }
    } catch (Exception e) {
        Log.e(e.getClass().getName(), e.getMessage());
    }
    if(bm.getWidth()>1000)
    {
        bm = getResizedBitmap(bm,1000);
    }

    try {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        bm.compress(Bitmap.CompressFormat.JPEG, 100, bos);
        byte[] data = bos.toByteArray();

        /*
        /....
           Multipart uploading work
        ..../   
        */

    } catch (Exception e) {
        Log.e(e.getClass().getName(), e.getMessage());
    }
}

public Bitmap checkForRotation(String filename) {

    Bitmap bitmap = BitmapFactory.decodeFile(filename);
    int tmpHeight, tmpWidth;
    tmpWidth = bitmap.getWidth();
    tmpHeight = bitmap.getHeight();
    if (tmpWidth > tmpHeight)
    {
        tmpWidth = 1000;
        tmpHeight = (bitmap.getHeight() * tmpWidth) / bitmap.getWidth();
    } else
    {
        tmpHeight = 1000;
        tmpWidth = (bitmap.getWidth() * tmpHeight) / bitmap.getHeight();
    }
    bitmap= Bitmap.createScaledBitmap(bitmap, tmpWidth, tmpHeight, true);

    ExifInterface ei = null;
    try {
        ei = new ExifInterface(filename);
        new ExifInterface(filename);
    } catch (IOException e) {
        e.printStackTrace();
    }
    int orientation = ei.getAttributeInt(ExifInterface.TAG_ORIENTATION,
            ExifInterface.ORIENTATION_NORMAL);

    switch (orientation) {
    case ExifInterface.ORIENTATION_ROTATE_90:
        bitmap = rotateImage(bitmap, 90);
        break;
    case ExifInterface.ORIENTATION_ROTATE_180:
        bitmap = rotateImage(bitmap, 180);
        break;
    }
    return bitmap;
}

public Bitmap getResizedBitmap(Bitmap bm, int newWidth) {
    int width = bm.getWidth();
    int height = bm.getHeight();

    float ratio  = (float)width/(float)height;
    float scaleWidth = ((float) newWidth) / width;
    float scaleHeight = ((float)newWidth/ratio) / height;

    // CREATE A MATRIX FOR THE MANIPULATION
    Matrix matrix = new Matrix();
    // RESIZE THE BIT MAP
    matrix.postScale(scaleWidth, scaleHeight);
    // RECREATE THE NEW BITMAP
    Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height,
            matrix, false);
    return resizedBitmap;
}

Answer 1

return friends将返回默认friends。你没有得到executeAsync()的行为。 executeAsync()将异步运行，方法将在安排executeAsync()任务后立即返回。

数据friends正在回调方法中进行修改，因此您必须从onCompleted()返回。

要返回数据，您可以使用回调界面请参阅How to define callback。

我无法从GraphRequest（）中获得任何值.cuteAsync（）

1 个答案: