【Android】零碎笔记

1、关于图片截取

// Launch picker to choose photo for selected contact
                    Intent intent = new Intent(Intent.ACTION_GET_CONTENT, null);
                    intent.setType("image/*");
                    intent.putExtra("crop", "true");
                    intent.putExtra("aspectX", aspectX);
                    intent.putExtra("aspectY", aspectY);//aspectX:aspectY实际上是剪切框的宽高比例；
                    intent.putExtra("outputX", outputX);    
                    intent.putExtra("outputY", outputY);
                    intent.putExtra("scale", scale);
                    intent.putExtra("return-data", return_data);
                    intent.putExtra(MediaStore.EXTRA_OUTPUT, getTempUri());
                    intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
                    intent.putExtra("noFaceDetection",!faceDetection); // lol, negative boolean noFaceDetection
                    if (circleCrop) {
                        intent.putExtra("circleCrop", true);
                    }
                    
                    startActivityForResult(intent, PHOTO_PICKED);

剪切图片有两种方式：一种是直接返回数据，另外一种是传入一个Uri，让剪切程序将结果保存到特定的位置；

详见：http://www.androidworks.com/crop_large_photos_with_android

2.画布抗锯齿

canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG));