从相机捕获照片时获取FileNotFoundException [英] Getting FileNotFoundException while capturing photo from Camera
问题描述
我正在将FileProvider.getUriForFile与给定的 provider_paths.xml 文件一起使用.我做错了什么我没明白.
I am using FileProvider.getUriForFile with given provider_paths.xml file. I am doing something wrong which I am not getting.
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path name="StrengGeheim" path="."/>
</paths>
我在
This I added in my AndroidManifest.xml inside tag:
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="${applicationId}.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/provider_paths"/>
</provider>
这是我的相机意图代码:
This is my camera Intent code:
private void cameraIntent() {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
fileUri = getOutputMediaFileUri();
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
startActivityForResult(intent, CAMERA);
}
private Uri getOutputMediaFileUri() {
try {
File file = getOutputMediaFile();
return FileProvider.getUriForFile(getActivity(), BuildConfig.APPLICATION_ID + ".provider", file);
}
catch (IOException ex){
ex.printStackTrace();
Toast.makeText(getContext(), MESSAGE_FAILED, Toast.LENGTH_SHORT).show();
}
return null;
}
private File getOutputMediaFile() throws IOException {
File encodeImageDirectory =
new File(Environment.getExternalStorageDirectory() + IMAGE_DIRECTORY);
if (!encodeImageDirectory.exists()) {
encodeImageDirectory.mkdirs();
}
String uniqueId = UUID.randomUUID().toString();
File mediaFile = new File(encodeImageDirectory, uniqueId + ".png");
mediaFile.createNewFile();
return mediaFile;
}
在文件Uri中，路径类似于此/StrengGeheim/StrengGeheim/21a70d51-3375-4d44-b698-0727b6f90065.png ，同时创建媒体文件来存储捕获的图像，但是存储图像的路径来自库的是/storage/emulated/0/StrengGeheim/06673da7-876f-4a53-9a3d-288ae033f7ac .捕获照片且应用程序关闭时出现错误消息.
In file Uri the path is something like this /StrengGeheim/StrengGeheim/21a70d51-3375-4d44-b698-0727b6f90065.png while creating the media file to store captured image but the path of storing image from gallery is /storage/emulated/0/StrengGeheim/06673da7-876f-4a53-9a3d-288ae033f7ac. I am getting below error while capturing photo and app is closing.
E/BitmapFactory: Unable to decode stream: java.io.FileNotFoundException: /StrengGeheim/StrengGeheim/21a70d51-3375-4d44-b698-0727b6f90065.png (No such file or directory)
W/System.err: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference
W/System.err: at com.stegano.strenggeheim.fragment.FragmentEncode.saveImage(FragmentEncode.java:166)
W/System.err: at com.stegano.strenggeheim.fragment.FragmentEncode.onActivityResult(FragmentEncode.java:143)
W/System.err: at android.support.v4.app.FragmentActivity.onActivityResult(FragmentActivity.java:151)
W/System.err: at android.app.Activity.dispatchActivityResult(Activity.java:7235)
W/System.err: at android.app.ActivityThread.deliverResults(ActivityThread.java:4320)
W/System.err: at android.app.ActivityThread.handleSendResult(ActivityThread.java:4367)
W/System.err: at android.app.ActivityThread.-wrap19(Unknown Source:0)
W/System.err: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1649)
W/System.err: at android.os.Handler.dispatchMessage(Handler.java:105)
W/System.err: at android.os.Looper.loop(Looper.java:164)
W/System.err: at android.app.ActivityThread.main(ActivityThread.java:6541)
W/System.err: at java.lang.reflect.Method.invoke(Native Method)
W/System.err: at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
这是我处理OnActivityResult的方式:
This is how I am handling OnActivityResult:
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == getActivity().RESULT_CANCELED) {
return;
}
try {
if (requestCode == GALLERY && data != null) {
Bitmap bitmap = getBitmapFromData(data, getContext());
File mediaFile = getOutputMediaFile();
String path = saveImage(bitmap, mediaFile);
Log.println(Log.INFO, "Message", path);
Toast.makeText(getContext(), MESSAGE_IMAGE_SAVED, Toast.LENGTH_SHORT).show();
loadImage.setImageBitmap(bitmap);
imageTextMessage.setVisibility(View.INVISIBLE);
} else if (requestCode == CAMERA) {
File file = new File(fileUri.getPath());
final Bitmap bitmap = BitmapFactory.decodeFile(fileUri.getPath());
loadImage.setImageBitmap(bitmap);
saveImage(bitmap, file);
Toast.makeText(getContext(), MESSAGE_IMAGE_SAVED, Toast.LENGTH_SHORT).show();
imageTextMessage.setVisibility(View.INVISIBLE);
}
} catch (Exception ex) {
ex.printStackTrace();
Toast.makeText(getContext(), MESSAGE_FAILED, Toast.LENGTH_SHORT).show();
}
}
private Bitmap getBitmapFromData(Intent intent, Context context){
Uri selectedImage = intent.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = context.getContentResolver().query(selectedImage,filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
return BitmapFactory.decodeFile(picturePath);
}
private String saveImage(Bitmap bmpImage, File mediaFile) {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
bmpImage.compress(Bitmap.CompressFormat.PNG, 100, bytes);
try {
FileOutputStream fo = new FileOutputStream(mediaFile);
fo.write(bytes.toByteArray());
MediaScannerConnection.scanFile(getContext(),
new String[]{mediaFile.getPath()},
new String[]{"image/png"}, null);
fo.close();
return mediaFile.getAbsolutePath();
} catch (IOException ex) {
ex.printStackTrace();
}
return "";
}
请问有人可以帮忙吗?
推荐答案
File file = new File(fileUri.getPath());
正如我之前指出的，这是错误的.摆脱这一行.
As I pointed out previously, this is wrong. Get rid of this line.
您需要的File是在创建要放入EXTRA_OUTPUT的Uri值时使用的那个.与其在字段中按住fileUri，不如在字段中按住File.
The File that you need is the one that you that you are using as part of creating the Uri value that you are putting into EXTRA_OUTPUT. Instead of holding onto fileUri in a field, hold onto that File in a field.
也:
-
请加载位图并在后台线程上执行磁盘I/O
Please load bitmaps and do disk I/O on background thread
请不要浪费用户的时间来创建 second 图像文件，因为您已经拥有一个(IOW，在拥有该文件时请勿调用saveImage())
Please do not waste the user's time creating a second image file, since you already have one (IOW, do not call saveImage() when you already have the file)
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