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在我的應用程序中，我將從網址下載圖像並將其寫入外部存儲器。它適用於我測試過的3個設備中的2個，並且在3日失敗。前兩個是LG和聯想設備（未根據），第三個是聯想（根源）。現在，當我使用下面的代碼保存所有文件工作正常，在第一次2級的設備，但拋出：無法在某些設備中保存文件（圖像）
IOException異常：打開失敗：EINVAL（無效參數）
創建文件。我的文件名中沒有任何非法字符，如下所示。
InputStream in = connection.getInputStream();
newPath = path + "/" + fileNameMobile;
File outFile = new File(newPath);
if(!outFile.exists()) {
outFile.createNewFile(); // fails here
}
OutputStream out = new FileOutputStream(outFile);
ImageHandler.copyFile(in, out);
out.flush();
out.close();
in.close();
和NEWPATH是
/storage/sdcard0/com.rahil.ecat/_5577d1b953e54351a4a7132252c11304.jpg
我不能準確地找到失敗的原因1臺設備上，並適用於其他2個設備。任何人有任何想法？在此先感謝
編輯：這是我如何得到fileNameMoblie：
String fileNameMobile = _url.substring(_url.lastIndexOf('/') + 1);
，並獲取路徑，並通過它來如下功能：
和這裏的不過outFile的結果.getAbsolutePath（）：
/storage/sdcard0/com.rahil.ecat/_5577d1b953e54351a4a7132252c11304.jpg
編輯2：下面是完整的代碼：
類ImageTask
public class ImageTask extends AsyncTask<Void, String, Void> {
private Context _Context;
private String _token;
private ImageView _imageView;
private ProgressBar _pbar;
private String _url;
private HttpRequestHandler _hrh;
private ImageType _type;
private RoundedImageView _rImageView;
public ImageTask(Context context, String token, ImageView imageView, RoundedImageView rImageView, ImageType type) {
this._Context = context;
_token = token;
_imageView = imageView;
_type = type;
_rImageView = rImageView;
}
@Override
protected Void doInBackground(Void... voids) {
if(!_token.isEmpty())
{
File sdCardRoot = Environment.getExternalStorageDirectory();
File yourDir = new File(sdCardRoot, _Context.getPackageName());
boolean found = false;
String[] tokenParts = _token.split("\\.");
String realToken = _token;
if(tokenParts.length == 2)
{
realToken = tokenParts[0];
}
for (File f : yourDir.listFiles()) {
if (f.isFile()) {
String name = f.getName();
if(name.contains(realToken))
{
found = true;
if(Util.isMobile(name))
{
publishProgress(yourDir.getPath() + '/' + name, "NULL");
}
else
{
if(Util.hasActiveInternetConnection(_Context)) {
getUrl();
if(!_url.isEmpty()) {
_hrh = new HttpRequestHandler(_url, _Context);
String fileName = _hrh.downloadImage(yourDir.getPath(), _token, true);
if (!fileName.isEmpty()) {
if(fileName.contains("-mob")) {
f.delete();
}
publishProgress(fileName, "NULL");
} else {
publishProgress("", "DEFAULT");
}
}else {
publishProgress("", "DEFAULT");
}
}
else
{
publishProgress("", "DEFAULT");
}
}
}
}
}
if(!found)
{
if(Util.hasActiveInternetConnection(_Context))
{
getUrl();
if(!_url.isEmpty()) {
_hrh = new HttpRequestHandler(_url, _Context);
String fileName = _hrh.downloadImage(yourDir.getPath(), _token, false);
if (!fileName.isEmpty()) {
publishProgress(fileName, "NULL");
} else {
publishProgress("", "DEFAULT");
}
}else {
publishProgress("", "DEFAULT");
}
}
else
{
publishProgress("", "DEFAULT");
}
}
}
else
{
loadDefaultImage();
}
return null;
}
@Override
protected void onProgressUpdate(String... values) {
if(values[1].equals("DEFAULT"))
{
loadDefaultImage();
}
else
{
loadImage(values[0]);
}
}
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
private void loadImage(String path)
{
try {
Bitmap image = BitmapFactory.decodeFile(path);
if (image != null) {
if(_imageView != null) {
StreamDrawable sd = null;
if(_type == ImageType.BLUR)
{
sd = new StreamDrawable(image, 10, 10);
_imageView.setBackground(sd);
}
else if(_type == ImageType.NO_EFFECT)
{
_imageView.setImageBitmap(image);
}
}
else if(_rImageView != null) {
_rImageView.setImageBitmap(image);
}
}
}
catch(Exception ex)
{
loadDefaultImage();
}
}
private void getUrl()
{
WebService ws = new WebService(_Context);
_url = ws.getImageUrlForScreenTypeAndToken(
_token,
Util.getScreenType(_Context).name());
}
private void loadDefaultImage()
{
if(_imageView != null) {
_imageView.setBackgroundResource(R.drawable.noimage);
}
else if(_rImageView != null) {
_rImageView.setBackgroundResource(R.drawable.noimage);
}
}
}
類HttpRequestHandler
public class HttpRequestHandler {
private String _url;
private Context _Context;
private ProgressDialog _dialog;
public HttpRequestHandler(String url, Context context) {
_url = url;
_Context = context;
}
public String init_post(List<NameValuePair> nameValuePairs) {
String data = null ;
BufferedReader in = null;
try {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
HttpParams params = new BasicHttpParams();
params.setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
HttpConnectionParams.setConnectionTimeout(params, 10000);
HttpConnectionParams.setSoTimeout(params, 5000);
HttpClient httpclient = new DefaultHttpClient(params);
HttpPost httppost = new HttpPost(_url);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs, "UTF-8"));
HttpResponse response = httpclient.execute(httppost);
data = parser(response.getEntity());
} catch (Exception e) {
}
return data;
}
public String init() {
String data = null ;
BufferedReader in = null;
try {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
HttpParams params = new BasicHttpParams();
params.setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
HttpConnectionParams.setConnectionTimeout(params, 10000);
HttpConnectionParams.setSoTimeout(params, 5000);
HttpClient httpclient = new DefaultHttpClient(params);
HttpGet request = new HttpGet();
URI website = new URI(_url);
request.setURI(website);
HttpResponse response = httpclient.execute(request);
data = parser(response.getEntity());
} catch (Exception t) {
if(true)
{
String s = "asd";
}
}
return data;
}
private String parser(HttpEntity entity){
InputStream is = null;
String jsonParse = "";
try {
is = entity.getContent();
//BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "utf-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
jsonParse = sb.toString();
} catch (IOException e) {
e.printStackTrace();
}
return jsonParse;
}
public String downloadImage(String path, String token, boolean check) {
String newPath = "";
try {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);
String fileNameMobile = _url.substring(_url.lastIndexOf('/') + 1);
if(check && token.equals(fileNameMobile))
{
return newPath;
}
URL urlConnection = new URL(_url);
URLConnection connection = urlConnection.openConnection();
InputStream in = connection.getInputStream();
newPath = path + "/" + fileNameMobile;
File outFile = new File(newPath);
OutputStream out = new FileOutputStream(outFile);
ImageHandler.copyFile(in, out);
out.flush();
out.close();
in.close();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return newPath;
}
}
它看起來像文件名問題，即使你說不是。在再次創建文件之前請仔細檢查文件名。登錄 – Xjasz 2015-03-31 17:41:01
@Xjasz這就是我所做的，我把它粘貼在我的日誌裏。這是完整的路徑，我看不到任何非法路徑，即使名稱有任何問題，爲什麼它只會在第三個設備上拋出錯誤？ – 2015-03-31 17:45:59
你最近怎麼樣？存儲位置是特定於設備的，所以如果你硬編碼/存儲/ sdcard0這可能是問題。 – GreyBeardedGeek 2015-03-31 17:51:08