Android：使用固定纵横比的相机拍摄后裁剪图像
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Android: Crop an Image after Taking it With Camera with a Fixed Aspect Ratio
提问by Wysie
I'm trying to crop an image after taking it, and my code is as follows:
我在拍摄后尝试裁剪图像，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
}
}
With the above code, I'm able to go to crop mode, and crop the picture. However, the 1:1 aspect ratio is not enforced, and neither is the outputX and outputY. I believe this is because the intent was for taking a picture, not for cropping. I've also written another method to getData() from the Intent, and after that use the following:
使用上面的代码，我可以进入裁剪模式，并裁剪图片。但是，1:1 的纵横比没有被强制执行，outputX 和 outputY 也没有强制执行。我相信这是因为目的是拍照，而不是裁剪。我还编写了另一个方法来从 Intent 获取 getData()，然后使用以下内容：
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setClassName("com.android.camera", "com.android.camera.CropImage");
However, when I do that, I get the following runtime error:
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
Thanks for the help! :)
谢谢您的帮助！:)
回答by Wysie
After doing some reading, I realized it can't be done so simply. My modded Contacts source is at http://github.com/Wysie, you can take a look if you're interested. Also, here's what I did to get it working:
读了一些书后，我意识到不能这么简单。我修改过的 Contacts 源在http://github.com/Wysie，如果你有兴趣可以看看。另外，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;
}
}
}
Hope it helps :)
希望能帮助到你 ：）
回答by dharmin007
Check out this post. I tested it on my android 1.5 (Htc Magic) and worked perfectly.
看看这个帖子。我在我的 android 1.5 (Htc Magic) 上对其进行了测试，并且运行良好。
回答by Christopher Orr
Have you tried this Intent(but keeping the crop/aspect/output/return-data extras you already have)?
你有没有试过这个Intent（但保留你已经拥有的裁剪/方面/输出/返回数据附加项）？
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("image/*");
That's basically what the Android contacts applicationdoes, so perhaps it won't quite fit your use case (i.e. taking a photo immediately, rather than having the option of selecting one from the gallery ortaking a new photo).
这基本上是Android 联系人应用程序所做的，所以它可能不太适合您的用例（即立即拍照，而不是从图库中选择一张照片或拍摄一张新照片）。
Worth a try anyway! :)
总之值得一试！:)
回答by Gordons
Though this might be a very old thread, I was able to crop a picture programmatically with the following code :
虽然这可能是一个非常古老的线程，但我能够使用以下代码以编程方式裁剪图片：
btnTakePicture.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent cameraIntent = new Intent(
android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_REQUEST);
}
});
then I cropped it with :
然后我裁剪它：
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) {
photo = (Bitmap) data.getExtras().get("data");
performcrop();
}
}
private void performcrop() {
DisplayMetrics displayMetrics = this.getResources().getDisplayMetrics();
int width = displayMetrics.widthPixels;
int height = displayMetrics.heightPixels;
Bitmap croppedBmp = Bitmap.createBitmap(photo, 0, 0, width / 2,
photo.getHeight());
imageTaken.setImageBitmap(croppedBmp);
}
imageTaken is an ImageView Component in my view. You can see my source Here
imageTaken 在我看来是一个 ImageView 组件。你可以在这里看到我的来源
