随着Android N的最新变化，我不得不升级我的代码以使用FileProvider使用相机/文件管理器获取图像/文件。 代码在模拟器（genymotion）中工作正常，但在Moto G4 plus中抛出IO异常。
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.N){
try {
ParcelFileDescriptor fcd = getContentResolver().openFileDescriptor(uriOrig,"r");// uriOrig is the uri returned from camera
if(fcd != null) {
InputStream inputStream = new FileInputStream(fcd.getFileDescriptor());
uploadCall =RestService.getInstance().uploadFile(mimeType, name, size,
inputStream, defaultResponseCallback);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
这是上传文件方法。
public Call<Attachment> uploadFile(final String mimeType, final String name, final long length,final InputStream is, final Callback<Attachment> callback) {
final int byteCount = 8192;
if (length > 0) {
RequestBody fileBody = new RequestBody() {
@Override
public MediaType contentType() {
return !TextUtils.isEmpty(mimeType) ? MediaType.parse(mimeType) : null;
}
@Override
public long contentLength() throws IOException {
return length;
}
@Override
public void writeTo(BufferedSink sink) throws IOException {
final long fileLength = contentLength();
byte[] buffer = new byte[byteCount];
long uploaded = 0;
try {
final Handler handler = new Handler(Looper.getMainLooper(), new Handler.Callback() {
@Override
public boolean handleMessage(Message msg) {
if (callback instanceof Callback2) {
Callback2 callback2 = (Callback2) callback;
long uploaded = (long) msg.obj;
callback2.onProgress(uploaded, fileLength);
}
return true;
}
});
int read;
while ((read = is.read(buffer)) != -1) {
uploaded += read;
sink.write(buffer, 0, read);
Log.d("write: ", "bytes: "+ new String(buffer));
Log.e("writeTo: ", uploaded + " up fd->");
// update progress on UI thread
handler.sendMessage(handler.obtainMessage(0, uploaded));
}
is.close();
} catch (IOException e) {
Log.e("file_upload", "Exception thrown while uploading", e);
}
Log.e("sink: "+uploaded + " bytes ", sink.toString(), new Exception("check"));
}
};
String fileName = name;
int index = name.lastIndexOf(".");
if (index < 0) {
String extension = MimeTypeMap.getSingleton().getExtensionFromMimeType(mimeType);
fileName += "." + extension;
}
MultipartBody.Part part = MultipartBody.Part.createFormData("file", fileName, fileBody);
Call<Attachment> call = companyRestInterface.uploadFile(part);
call.enqueue(callback);
return call;
}
}
堆栈跟踪
java.io.IOException: read failed: EBADF (Bad file descriptor)
at libcore.io.IoBridge.read(IoBridge.java:481)
at java.io.FileInputStream.read(FileInputStream.java:252)
at java.io.FileInputStream.read(FileInputStream.java:223)
at xend.app.http.RestService$10.writeTo(RestService.java:767)
at okhttp3.MultipartBody.writeOrCountBytes(MultipartBody.java:173)
at okhttp3.MultipartBody.writeTo(MultipartBody.java:114)
at okhttp3.internal.http.CallServerInterceptor.intercept(CallServerInterceptor.java:62)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:45)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:120)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
at xend.app.http.MyInterceptor.intercept(MyInterceptor.java:51)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:185)
at okhttp3.RealCall$AsyncCall.execute(RealCall.java:135)
at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
Caused by: android.system.ErrnoException: read failed: EBADF (Bad file descriptor)
at libcore.io.Posix.readBytes(Native Method)
at libcore.io.Posix.read(Posix.java:169)
at libcore.io.BlockGuardOs.read(BlockGuardOs.java:231)
at libcore.io.IoBridge.read(IoBridge.java:471)
at java.io.FileInputStream.read(FileInputStream.java:252)
at java.io.FileInputStream.read(FileInputStream.java:223)
at xend.app.http.RestService$10.writeTo(RestService.java:767)
at okhttp3.MultipartBody.writeOrCountBytes(MultipartBody.java:173)
at okhttp3.MultipartBody.writeTo(MultipartBody.java:114)
at okhttp3.internal.http.CallServerInterceptor.intercept(CallServerInterceptor.java:62)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:45)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:120)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
at xend.app.http.MyInterceptor.intercept(MyInterceptor.java:51)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:185)
at okhttp3.RealCall$AsyncCall.execute(RealCall.java:135)
at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
非常感谢任何帮助。
修改
图像uri部分。
Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File externalCacheDir = getExternalCacheDir();
File extFile = new File(externalCacheDir,
String.valueOf(System.currentTimeMillis()) + ".jpg");
mImageCaptureUri = FileProvider.getUriForFile(DirectChatActivity.this,
BuildConfig.APPLICATION_ID + ".provider",extFile);
grantUriPermission("xend.app", mImageCaptureUri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
cameraIntent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
cameraIntent.setFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, mImageCaptureUri);
这个mImageCaptureUri后来被称为uriOrig。 取得所有权限并相应地工作。
答案 0 :(得分：2)
问题在于ParcelFileDescriptor。它关闭输入流。所以更换线
ParcelFileDescriptor fcd = getContentResolver().openFileDescriptor(uriOrig,"r");// uriOrig is the uri returned from camera
if(fcd != null) {
InputStream inputStream = new FileInputStream(fcd.getFileDescriptor());
uploadCall =RestService.getInstance().uploadFile(mimeType, name, size,
inputStream, defaultResponseCallback);
}
与
InputStream inputStream = getContentResolver().openInputStream(uriOrig);
uploadCall =RestService.getInstance().uploadFile(mimeType, name, size,
inputStream, defaultResponseCallback);
完成了工作。
答案 1 :(得分：0)
在更新UI进度栏时，这比在将文件下载到外部存储设备时所需的更新频率过高的情况要高。我通过定期更新进度（仅增加1％）来放松下载线程（asyncTask）中的UI更新。
答案 2 :(得分：0)
在不同文件之间进行读写时，我遇到了类似的问题，我关闭了：文件输入/输出通道和文件输入/输出流，但我忘了最后关闭了相关的资产/地块文件描述符。一旦我也关闭了资产/包裹文件描述符，这些随机的“错误文件描述符”异常就消失了。