Question

当我尝试拍摄照片并从onActivityResult（）获取时，我的Android应用程序出现问题。我想确保代码能够正常运行，因此我刚刚复制了此页面的确切代码http://developer.android.com/training/camera/photobasics.html。

所以这些是我使用的方法;当用户点击按钮时，我调用dispatchTakePictureIntent（）。

private File createImageFile() throws IOException {
    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = Environment.getExternalStoragePublicDirectory(
            Environment.DIRECTORY_PICTURES);
    File image = File.createTempFile(
        imageFileName,  /* prefix */
        ".jpg",         /* suffix */
        storageDir      /* directory */
    );

    // Save a file: path for use with ACTION_VIEW intents
    mCurrentPhotoPath = "file:" + image.getAbsolutePath();
    return image;
}

private void dispatchTakePictureIntent() {
    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) {

        }
        // Continue only if the File was successfully created
        if (photoFile != null) {
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
                    Uri.fromFile(photoFile));
            startActivityForResult(takePictureIntent, 15);
        }
    }
}`

问题是当调用onActivityResult（）方法时，我得到正确的requestCode，正确的resultCode，但第三个参数为null。我想获取图像Bitmap或Path，但我不能没有它。为什么会这样？是因为这段代码不应该返回该参数吗？在那种情况下，我应该如何修改它？

Answer 1

尝试此代码测试。

拍照

private void TakePicture(){
    Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
    startActivityForResult(intent, 0);
}

保存到文件

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    switch (requestCode) {
    case 0:
        if (resultCode == Activity.RESULT_OK) {

            try{  

                String filename = "name.jpg";
                File sd = Environment.getExternalStorageDirectory();
                File dest = new File(sd, filename);
                Bitmap bp = (Bitmap) data.getExtras().get("data");

                FileOutputStream out = new FileOutputStream(dest);
                bp.compress(Bitmap.CompressFormat.JPEG, 90, out);
                out.flush();
                out.close();
                //

            } catch (Exception e) {
                Toast.makeText(this, "Failed", Toast.LENGTH_SHORT)
                .show();
                Log.e("Camera", e.toString());
            }
        }
    }
}

Answer 2

仅当您在拍照后未指定用于保存图像的文件URI时，才会收到onActivityResult()中的缩略图图像。如果要接收预览图像，请从代码中删除此行：

takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));

拍照安卓

2 个答案: