Android:使用固定纵横比的相机拍摄图像后裁剪图像

Question

我正在尝试拍摄后裁剪图像，我的代码如下:

   private void doTakePhotoAction() {

        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, MediaStore.Images.Media.EXTERNAL_CONTENT_URI.toString());
        intent.putExtra("crop", "true");
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 1);
        intent.putExtra("outputX", 96);
        intent.putExtra("outputY", 96);

        try {
            intent.putExtra("return-data", true);
            startActivityForResult(intent, PICK_FROM_CAMERA);
        } catch (ActivityNotFoundException e) {
            //Do nothing for now
        }
    }

使用上面的代码，我可以进入裁剪模式，裁剪图片。但是，不强制使用 1:1 纵横比，也不是 outputX 和 outputY。我相信这是因为目的是拍照，而不是裁剪。我还编写了另一种方法从 Intent 中获取 getData()，然后使用以下方法:

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

但是，当我这样做时，我收到以下运行时错误:

E/AndroidRuntime(14648): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.camera/com.android.camera.CropImage}: java.lang.NullPointerException

感谢您的帮助! :)

Answer 1

读了一些之后，我意识到不能这么简单。我修改后的联系人来源是 http://github.com/Wysie ，有兴趣的可以看看。此外，这是我为使其正常工作所做的工作:

private void doTakePhotoAction() {
    // http://2009.hfoss.org/Tutorial:Camera_and_Gallery_Demo
    // http://stackoverflow.com/questions/1050297/how-to-get-the-url-of-the-captured-image
    // http://www.damonkohler.com/2009/02/android-recipes.html
    // http://www.firstclown.us/tag/android/
    // The one I used to get everything working: http://groups.google.com/group/android-developers/msg/2ab62c12ee99ba30 

    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

    //Wysie_Soh: Create path for temp file
    mImageCaptureUri = Uri.fromFile(new File(Environment.getExternalStorageDirectory(),
                        "tmp_contact_" + String.valueOf(System.currentTimeMillis()) + ".jpg"));

    intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, mImageCaptureUri);

    try {
        intent.putExtra("return-data", true);
        startActivityForResult(intent, PICK_FROM_CAMERA);
    } catch (ActivityNotFoundException e) {
        //Do nothing for now
    }
}

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode != RESULT_OK) {
        return;
    }

    switch (requestCode) {

    case CROP_FROM_CAMERA: {
        //Wysie_Soh: After a picture is taken, it will go to PICK_FROM_CAMERA, which will then come here
        //after the image is cropped.

        final Bundle extras = data.getExtras();

        if (extras != null) {
            Bitmap photo = extras.getParcelable("data");

            mPhoto = photo;
            mPhotoChanged = true;
            mPhotoImageView.setImageBitmap(photo);
            setPhotoPresent(true);
        }

        //Wysie_Soh: Delete the temporary file                        
        File f = new File(mImageCaptureUri.getPath());            
        if (f.exists()) {
            f.delete();
        }

        InputMethodManager mgr = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        mgr.showSoftInput(mPhotoImageView, InputMethodManager.SHOW_IMPLICIT);

        break;
    }

    case PICK_FROM_CAMERA: {
        //Wysie_Soh: After an image is taken and saved to the location of mImageCaptureUri, come here
        //and load the crop editor, with the necessary parameters (96x96, 1:1 ratio)

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

        intent.setData(mImageCaptureUri);
        intent.putExtra("outputX", 96);
        intent.putExtra("outputY", 96);
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 1);
        intent.putExtra("scale", true);
        intent.putExtra("return-data", true);            
        startActivityForResult(intent, CROP_FROM_CAMERA);

        break;

    }
    }
}

希望对你有帮助:)