如何从相机中裁剪图像
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【中文标题】如何从相机中裁剪图像【英文标题】:How to crop images from camera 【发布时间】:2014-12-09 00:32:49 【问题描述】:如何裁剪相机图像。现在它正在显示要裁剪的图像,并在点击“保存”按钮的同时选择裁剪部分。它显示为“保存图片”。之后什么都没有发生。这是我的代码。
按钮点击:
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", 0);
intent.putExtra("aspectY", 0);
intent.putExtra("outputX", 200);
intent.putExtra("outputY", 150);
intent.putExtra("return-data", true);
startActivityForResult(intent, CAMERA_PIC_REQUEST);
onActivityResult :
Bundle extras = data.getExtras();
Bitmap bitmap = (Bitmap) extras.get("data");
if (bitmap != null)
Img_View.setImageBitmap(bitmap);
【问题讨论】:
【参考方案1】:您可以使用此代码执行裁剪:
.....
final int CAMERA_CAPTURE = 1;
final int CROP_PIC = 2;
private Uri picUri;
....
@Override
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button captureBtn = (Button) findViewById(R.id.capture_btn);
captureBtn.setOnClickListener(this);
public void onClick(View v)
if (v.getId() == R.id.capture_btn)
try
// use standard intent to capture an image
Intent captureIntent = new Intent(
MediaStore.ACTION_IMAGE_CAPTURE);
// we will handle the returned data in onActivityResult
startActivityForResult(captureIntent, CAMERA_CAPTURE);
catch (ActivityNotFoundException anfe)
Toast toast = Toast.makeText(this, "This device doesn't support the crop action!",
Toast.LENGTH_SHORT);
toast.show();
protected void onActivityResult(int requestCode, int resultCode, Intent data)
if (resultCode == RESULT_OK)
if (requestCode == CAMERA_CAPTURE)
// get the Uri for the captured image
picUri = data.getData();
performCrop();
// user is returning from cropping the image
else if (requestCode == CROP_PIC)
// get the returned data
Bundle extras = data.getExtras();
// get the cropped bitmap
Bitmap thePic = extras.getParcelable("data");
ImageView picView = (ImageView) findViewById(R.id.picture);
picView.setImageBitmap(thePic);
/**
* this function does the crop operation.
*/
private void performCrop()
// take care of exceptions
try
// call the standard crop action intent (the user device may not
// support it)
Intent cropIntent = new Intent("com.android.camera.action.CROP");
// indicate image type and Uri
cropIntent.setDataAndType(picUri, "image/*");
// set crop properties
cropIntent.putExtra("crop", "true");
// indicate aspect of desired crop
cropIntent.putExtra("aspectX", 2);
cropIntent.putExtra("aspectY", 1);
// indicate output X and Y
cropIntent.putExtra("outputX", 256);
cropIntent.putExtra("outputY", 256);
// retrieve data on return
cropIntent.putExtra("return-data", true);
// start the activity - we handle returning in onActivityResult
startActivityForResult(cropIntent, CROP_PIC);
// respond to users whose devices do not support the crop action
catch (ActivityNotFoundException anfe)
Toast toast = Toast
.makeText(this, "This device doesn't support the crop action!", Toast.LENGTH_SHORT);
toast.show();
您可以使用以下简单教程进行裁剪:
-
http://khurramitdeveloper.blogspot.in/2013/07/capture-or-select-from-gallery-and-crop.html
http://www.londatiga.net/featured-articles/how-to-select-and-crop-image-on-android/
http://www.coderzheaven.com/2012/12/15/crop-image-android/
http://shaikhhamadali.blogspot.in/2013/09/capture-images-and-crop-images-using.html
【讨论】:
此代码有效,我只需要保存一个问题来保存图像路径,但裁剪后的图像是否允许这样做?并且可以使用新的 uri 而不是显示图像的位图? 我在这条线上遇到了 nullPointerException。 捆绑附加服务 = data.getExtras();。 extras 为空。我使用的是安卓 M 设备。 不起作用!因为在 CAMERA_CAPTURE 之后 data.getData() 为空【参考方案2】:为自己节省大量时间并使用 this library 我自己在搞砸了,偶然发现了这个库,它使用起来非常简单,你会得到一个专业的图像裁剪视图,让你可以选择相机或照片库。
简单示例:
在你的 gradle 中包含这个库
implementation 'com.theartofdev.edmodo:android-image-cropper:2.7.+'
向清单添加权限
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
//add this under <application>
<activity android:name="com.theartofdev.edmodo.cropper.CropImageActivity"
android:theme="@style/Base.Theme.AppCompat"/>
在你的活动中
//on button press or anywhere, this starts the image picking and cropping process
CropImage.activity()
.setGuidelines(CropImageView.Guidelines.ON)
.start(this);
//in your activity where you will get the result of your cropped image
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data)
if (requestCode == CropImage.CROP_IMAGE_ACTIVITY_REQUEST_CODE)
CropImage.ActivityResult result = CropImage.getActivityResult(data);
if (resultCode == RESULT_OK)
Uri resultUri = result.getUri();
//From here you can load the image however you need to, I recommend using the Glide library
else if (resultCode == CropImage.CROP_IMAGE_ACTIVITY_RESULT_ERROR_CODE)
Exception error = result.getError();
我不隶属于这个软件
【讨论】:
虽然此链接可能会回答问题,但最好在此处包含答案的基本部分并提供链接以供参考。如果链接页面发生更改,仅链接答案可能会失效。 - From Review @MaxVollmer ive 添加了一个简单的例子 @Fonix 您提到的库非常好,但遗憾的是,它不再维护并且使用了已弃用的功能。如果您能推荐您知道的任何其他图书馆,那就太好了。 @James 很遗憾没有,因为我有一段时间不用对相机做任何事情了【参考方案3】:试试这个
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
mImageCaptureUri = Uri.fromFile(new File(Environment
.getExternalStorageDirectory(), "tmp_avatar_"
+ String.valueOf(System.currentTimeMillis())
+ ".jpg"));
intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT,
mImageCaptureUri);
intent.setData(mImageCaptureUri);
intent.putExtra("outputX", 200);
intent.putExtra("outputY", 200);
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
intent.putExtra("scale", true);
intent.putExtra("return-data", true);
【讨论】:
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