Question

Intent intent = new Intent("com.android.camera.action.CROP");

File path = this.getExternalFilesDir("tmp");
File file = new File(path, "tmp_" + String.valueOf(System.currentTimeMillis()) + ".jpg");
Uri tmpUri = Uri.fromFile(file);

intent.setData(selectedImage);
intent.putExtra(MediaStore.EXTRA_OUTPUT, tmpUri);
intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
intent.putExtra("crop", "true");
intent.putExtra("scale", "true");
intent.putExtra("outputX", 100);
intent.putExtra("outputY", 100);
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);

intent.putExtra("return-data", false);        
startActivityForResult(intent, REQUEST_CROP);

I am using this code to crop image. It works perfectly on android 2.x. But on 3.1(motorola xoom) and 3.2(acer iconia) the application freeze after I select crop area and tap "Save" (onActivityResult is not even called). There is a real Uri to real image in selectedImage variable, so the problem is not here.

On the 3.1 and 3.2 android emulators the application works perfectly too. Does anyone know what s the problem?

Answer 1

问题可能是已经开始的作物活动。 “选择” = “真实”外在装置上工作并不保证,因为它是非正式的。

See this thread for more details:

Answer 2

对这种方法,它为我工作。它不是地雷,我是在 st流中建立的:。如何种植比特马中心,如图像调查?

public Bitmap scaleCenterCrop(Bitmap source, int newHeight, int newWidth) {
    int sourceWidth = source.getWidth();
    int sourceHeight = source.getHeight();

    // Compute the scaling factors to fit the new height and width, respectively.
    // To cover the final image, the final scaling will be the bigger 
    // of these two.
    float xScale = (float) newWidth / sourceWidth;
    float yScale = (float) newHeight / sourceHeight;
    float scale = Math.max(xScale, yScale);

    // Now get the size of the source bitmap when scaled
    float scaledWidth = scale * sourceWidth;
    float scaledHeight = scale * sourceHeight;

    // Let s find out the upper left coordinates if the scaled bitmap
    // should be centered in the new size give by the parameters
    float left = (newWidth - scaledWidth) / 2;
    float top = (newHeight - scaledHeight) / 2;

    // The target rectangle for the new, scaled version of the source bitmap will now
    // be
    RectF targetRect = new RectF(left, top, left + scaledWidth, top + scaledHeight);

    // Finally, we create a new bitmap of the specified size and draw our new,
    // scaled bitmap onto it.
    Bitmap dest = Bitmap.createBitmap(newWidth, newHeight, source.getConfig());
    Canvas canvas = new Canvas(dest);
    canvas.drawBitmap(source, null, targetRect, null);

    return dest;
}

Answer 3

替换<代码>intent.setData(s selectedImage); by intent.setDataAndType(s selectedImage, “image/*”;

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