为什么在onActivityResult的数据参数中为null [英] Why do I get null in data parmeter of onActivityResult

问题描述

在使用数据参数等于NULL的pic onActivityResult拍照后，我使用以下代码从android相机拍照.

I use the following code to take picture from the android camera, after taking the pic onActivityResult is called with data parameter equals NULL.

代码-

public void getpic(View v){
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    // Ensure that there's a camera activity to handle the intent
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        // Create the File where the photo should go
        File photoFile = null;
        try {
            photoFile = createImageFile();
        } catch (IOException ex) {
            // Error occurred while creating the File
            //...
        }
        // Continue only if the File was successfully created
        if (photoFile != null) {
            Uri photoURI = FileProvider.getUriForFile(this,
                    "com.example.myfirstapp.fileprovider",
                    photoFile);

            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
            startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);//REQUEST_TAKE_PHOTO
        }
    }

}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    //super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
        Bundle extras = data.getExtras();
        Bitmap imageBitmap = (Bitmap) extras.get("data");
        mImageView.setImageBitmap(imageBitmap);
    }
}

推荐答案

引用

Quoting the documentation for ACTION_IMAGE_CAPTURE:

调用方可以传递一个额外的EXTRA_OUTPUT来控制将图像写入何处.如果不存在EXTRA_OUTPUT，则会在Extra字段中将一个小型图像作为Bitmap对象返回.这对于只需要较小图像的应用程序很有用.如果存在EXTRA_OUTPUT，则将完整尺寸的图像写入EXTRA_OUTPUT的Uri值.

The caller may pass an extra EXTRA_OUTPUT to control where this image will be written. If the EXTRA_OUTPUT is not present, then a small sized image is returned as a Bitmap object in the extra field. This is useful for applications that only need a small image. If the EXTRA_OUTPUT is present, then the full-sized image will be written to the Uri value of EXTRA_OUTPUT.

您提供了 EXTRA_OUTPUT .您的照片应写到您在 EXTRA_OUTPUT 中提供的位置.您在响应中额外添加的 data 应该为 null .

You provided EXTRA_OUTPUT. Your photo should be written to the location you provided in EXTRA_OUTPUT. Your data extra on the response should be null.

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