Java MediaStore.EXTRA_OUTPUT 渲染数据为空，还有其他保存照片的方式吗？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/16348757/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
MediaStore.EXTRA_OUTPUT renders data null, other way to save photos?
提问by Hymanson Flint-Gonzales
Google offers this versatile code for taking photos via an intent:
谷歌提供了这个通过意图拍照的通用代码：
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// create Intent to take a picture and return control to the calling application
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE); // create a file to save the image
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri); // set the image file name
// start the image capture Intent
startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
}
The problem is that if you're like me and you want to pass the photos as extras, using EXTRA_OUTPUTseemingly runs off with the photo data and makes subsequent actions think the intent data is null.
问题是，如果你像我一样，想要将照片作为额外内容传递，使用EXTRA_OUTPUT看似运行的照片数据并使后续动作认为意图数据为空。
It appearsthis is a big bug with Android.
看来这是Android的一个大错误。
I'm trying to take a photo then display it as a thumbnail in a new view. I'd like to have it saved as a full sized image in the user's gallery. Does anyone know a way to specify the image location without using EXTRA_OUTPUT?
我正在尝试拍照，然后在新视图中将其显示为缩略图。我想将它保存为用户图库中的全尺寸图像。有谁知道不使用指定图像位置的方法EXTRA_OUTPUT吗？
Here's what I have currently:
这是我目前所拥有的：
public void takePhoto(View view) {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
// takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
startActivityForResult(takePictureIntent, CAMERA_REQUEST_CODE);
}
/** Create a file Uri for saving an image or video */
private static Uri getOutputMediaFileUri(int type){
return Uri.fromFile(getOutputMediaFile(type));
}
/** Create a File for saving an image or video */
@SuppressLint("SimpleDateFormat")
private static File getOutputMediaFile(int type){
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES), "JoshuaTree");
if (! mediaStorageDir.exists()){
if (! mediaStorageDir.mkdirs()){
Log.d("JoshuaTree", "failed to create directory");
return null;
}
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File mediaFile;
if (type == MEDIA_TYPE_IMAGE){
mediaFile = new File(mediaStorageDir.getPath() + File.separator +
"IMG_"+ timeStamp + ".jpg");
} else {
return null;
}
return mediaFile;
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAMERA_REQUEST_CODE) {
if (resultCode == RESULT_OK) {
handleSmallCameraPhoto(data);
}
}
}
private void handleSmallCameraPhoto(Intent intent) {
Bundle extras = intent.getExtras();
mImageBitmap = (Bitmap) extras.get("data");
Intent displayIntent = new Intent(this, DisplayPhotoActivity.class);
displayIntent.putExtra("BitmapImage", mImageBitmap);
startActivity(displayIntent);
}
}
}
回答by Jeff Liu
If you specified MediaStore.EXTRA_OUTPUT, the image taken will be written to that path, and no data will given to onActivityResult. You can read the image from what you specified.
如果您指定了 MediaStore.EXTRA_OUTPUT，则拍摄的图像将写入该路径，并且不会向 onActivityResult 提供任何数据。您可以从指定的内容中读取图像。
See another solved same question here: Android Camera : data intent returns null
在此处查看另一个已解决的相同问题：Android 相机：数据意图返回 null
回答by Mohit
Here is how you can achieve what you want:
以下是您如何实现您想要的：
public void onClick(View v)
{
switch(v.getId())
{
case R.id.iBCamera:
File image = new File(appFolderCheckandCreate(), "img" + getTimeStamp() + ".jpg");
Uri uriSavedImage = Uri.fromFile(image);
Intent i = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
i.putExtra(MediaStore.EXTRA_OUTPUT, uriSavedImage);
i.putExtra("return-data", true);
startActivityForResult(i, CAMERA_RESULT);
break;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
switch(requestCode)
{
case CAMERA_RESULT:
if(resultCode==RESULT_OK)
{
handleSmallCameraPhoto(uriSavedImage);
}
break;
}
}
private void handleSmallCameraPhoto(Uri uri)
{
Bitmap bmp=null;
try {
bmp = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
Intent displayIntent = new Intent(this, DisplayPhotoActivity.class);
displayIntent.putExtra("BitmapImage", bmp);
startActivity(displayIntent);
}
private String appFolderCheckandCreate(){
String appFolderPath="";
File externalStorage = Environment.getExternalStorageDirectory();
if (externalStorage.canWrite())
{
appFolderPath = externalStorage.getAbsolutePath() + "/MyApp";
File dir = new File(appFolderPath);
if (!dir.exists())
{
dir.mkdirs();
}
}
else
{
showToast(" Storage media not found or is full ! ");
}
return appFolderPath;
}
private String getTimeStamp() {
final long timestamp = new Date().getTime();
final Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(timestamp);
final String timeString = new SimpleDateFormat("HH_mm_ss_SSS").format(cal.getTime());
return timeString;
}
Edit:
编辑：
Add these to Manifest:
将这些添加到清单：
Starting Api 19 and above READ_EXTERNAL_STORAGE should be declared explicitly
从 Api 19 及以上开始，应明确声明 READ_EXTERNAL_STORAGE
*<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />*
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
to you manifest.
向你显现。
回答by Ciro Rizzo
Basically, there are two ways to retrieve the image from Camera, if you use to send a captured image through intent extras you cannot retrieve it on ActivityResult on intent.getData() ' because it saves the image data through extras.
基本上，有两种方法可以从 Camera 检索图像，如果您使用通过 Intent Extras 发送捕获的图像，则无法在 Intent.getData() 的 ActivityResult 上检索它，因为它通过 extras 保存图像数据。
So the idea is:
所以这个想法是：
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
And retrieving it on ActivityResults checking the retrieved intent:
并在 ActivityResults 上检索它，检查检索到的意图：
@Override
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (resultCode == RESULT_OK) {
if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {
if (intent.getData() != null) {
ParcelFileDescriptor parcelFileDescriptor = context.getContentResolver().openFileDescriptor(intent.getData(), "r"); ?
FileDescriptor fileDescriptor = parcelFileDescriptor.getFileDescriptor();
Bitmap image = BitmapFactory.decodeFileDescriptor(fileDescriptor);
parcelFileDescriptor.close();
} else {
Bitmap imageRetrieved = (Bitmap) intent.getExtras().get("data");
}
}
}
}
回答by NomanJaved
Try this one android.provider.MediaStore.EXTRA_OUTPUThope will solve your bug. The following code works for me:
试试这个android.provider.MediaStore.EXTRA_OUTPUT希望能解决你的错误。以下代码对我有用：
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, fileUri);
startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
I was facing same problem, every time getting null while retrieving data on other activity with getIntent().getData()then solved by writting complete android.provider.MediaStore.EXTRA_OUTPUTthis solved my bug.
我遇到了同样的问题，每次在检索其他活动的数据时都为空，getIntent().getData()然后通过编写完成android.provider.MediaStore.EXTRA_OUTPUT来解决这解决了我的错误。
