android - 如何将捕获的图像文件保存到 data/data//cache ？

Question

我需要保护我拍摄的图像。来自安卓Android Training 我能够拍摄全尺寸图像。但这不是我的需要。我需要将全尺寸图像保存到缓存目录 (/data/data//cache)，当用户离开我的应用程序时，我将删除这些缓存文件夹。

这是我的代码，文件在缓存目录中成功创建。但是文件大小为零，没有写入图像

static final int REQUEST_TAKE_PHOTO = 1;

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) {
        File file=null;
        try {
            String fileName = "506214";
            file = File.createTempFile(fileName, null, this.getCacheDir());
        } catch (IOException e) {
            // Error while creating file
        }
        photoURI = Uri.fromFile(file);
        Toast.makeText(this, photoURI.toString(), Toast.LENGTH_SHORT).show();
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,photoURI);
            startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if(requestCode == REQUEST_TAKE_PHOTO && resultCode == RESULT_OK){
        camera_image.setImageURI(photoURI);
    }
    super.onActivityResult(requestCode, resultCode, data);
}

Answer 1

试试这个我的 friend

File imagesFolder = new File(Environment.getExternalStorageDirectory(), "MyImages");
    imagesFolder.mkdirs(); // <----
    File image = new File(imagesFolder, "image_001.jpg");
    Uri uriSavedImage = Uri.fromFile(image);
    imageIntent.putExtra(MediaStore.EXTRA_OUTPUT, uriSavedImage);

并且不要忘记在 list 文件中添加 permisoon

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />