您好,我试图将从url获取的图片保存到应用程序中,但是当我试图访问内存以放置数据时,会出现一个错误
无法解码流java.io.fileNotFoundException/storage/emulated/0 open失败:enoent(没有这样的文件或目录)
这是我的下载管理类
public static ArrayList<String> urls = new ArrayList<String>();
public static OnDownloadCompleteListener downloadCompleteListener;
public static void copyFile(String sourceFile, String destinationFile) {
FileInputStream inputStream = null;
FileOutputStream outputStream = null;
try {
inputStream = new FileInputStream(sourceFile);
outputStream = new FileOutputStream(destinationFile);
byte[] buffer = new byte[G.DOWNLOAD_BUFFER_SIZE];
int len;
while ((len = inputStream.read(buffer)) > 0) {
outputStream.write(buffer, 0, len);
}
}
catch (FileNotFoundException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
} finally {
if (inputStream != null) {
try {
inputStream.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
if (outputStream != null) {
try {
outputStream.flush();
outputStream.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
}
public static void initialize() {
downloadCompleteListener = new OnDownloadCompleteListener() {
@Override
public void onDownloadComplete(String url, String localPath) {
Log.i("LOG", "Image Download Complete, Original URL: " + url + ", Save Path: " + localPath);
String newPath = localPath.replace("/temp/", "/final/");
copyFile(localPath, newPath);
String filename = HelperString.getFileName(localPath);
new File(localPath).delete();
Set<ImageView> imageViews = AdapterSerials.imageMap.keySet();
for (ImageView imageView: imageViews) {
if (AdapterSerials.imageMap.get(imageView).equals(filename)) {
if (imageView != null) {
BitmapFactory.Options options = new BitmapFactory.Options();
//options.inSampleSize = 8;
Bitmap bitmap = BitmapFactory.decodeFile(newPath, options);
imageView.setImageBitmap(bitmap);
}
}
}
}
};
}
public static void addToDownloadList(String url, ImageView imgLogo) {
String filename = HelperString.getFileName(url);
AdapterSerials.imageMap.put(imgLogo, filename);
if (urls.contains(url)) {
return;
}
if (new File(G.DIR_FINAL + "/" + filename).exists()) {
return;
}
urls.add(url);
DownloadRequest downloadRequest = new DownloadRequest()
.downloadPath("http://87.236.215.180/mazi/" + url)
.filepath(G.DIR_TEMP + "/" + filename)
.listener(downloadCompleteListener)
.download();
}
这是我的下载请求类:
public class DownloadRequest {
private int downloadedSize;
private int totalSize;
private int percent;
public int getDownloadedSize() {
return downloadedSize;
}
public int getTotalSize() {
return totalSize;
}
public int getPercent() {
return percent;
}
public DownloadRequest download() {
Thread thread = new Thread(new Runnable() {
@Override
public void run() {
try {
URL url = new URL(downloadPath);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setDoOutput(true);
connection.connect();
totalSize = connection.getContentLength();
File file = new File(filepath);
if (file.exists()) {
file.delete();
}
FileOutputStream outputStream = new FileOutputStream(filepath);
InputStream inputStream = connection.getInputStream();
byte[] buffer = new byte[G.DOWNLOAD_BUFFER_SIZE];
int len = 0;
while ((len = inputStream.read(buffer)) > 0) {
outputStream.write(buffer, 0, len);
downloadedSize += len;
percent = (int) (100.0f * (float) downloadedSize / totalSize);
if (percent == 100 && listener != null) {
G.HANDLER.post(new Runnable() {
@Override
public void run() {
listener.onDownloadComplete(downloadPath, filepath);
}
});
}
if (simulate) {
try {
Thread.sleep(100);
}
catch (InterruptedException e) {
e.printStackTrace();
}
}
}
outputStream.close();
}
catch (MalformedURLException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
}
});
thread.start();
return this;
}
private String downloadPath;
private String filepath;
private OnDownloadCompleteListener listener;
private boolean simulate;
public DownloadRequest downloadPath(String value) {
downloadPath = value;
return this;
}
public DownloadRequest filepath(String value) {
filepath = value;
return this;
}
public DownloadRequest listener(OnDownloadCompleteListener value) {
listener = value;
return this;
}
public DownloadRequest simulate(boolean value) {
simulate = value;
return this;
}
这是我的G班:
public class G extends Application {
public static Context context;
public static final String SDCARD = Environment.getExternalStorageDirectory().getAbsolutePath();
public static final String DIR_APP = SDCARD + "/serial";
public static final String DIR_CACHE = DIR_APP + "/cache";
public static LayoutInflater inflater;
public static final Handler HANDLER = new Handler();
public static Activity currentActivity;
public static StructSerials selectedSerials;
public static StructFavSerials selectedFavSerials;
public static ArrayList<StructComment> rates = new ArrayList<StructComment>();
public static final int DOWNLOAD_BUFFER_SIZE = 8 * 1024;
public static final String DIR_FINAL = DIR_APP + "/final";
public static final String DIR_TEMP = DIR_APP + "/temp";
public static String android_id;
public static SharedPreferences preferences;
@Override
public void onCreate() {
super.onCreate();
context = getApplicationContext();
preferences = PreferenceManager.getDefaultSharedPreferences(context);
initImageLoader(getApplicationContext());
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
android_id = Secure.getString(context.getContentResolver(),
Secure.ANDROID_ID);
new File(DIR_APP).mkdirs();
new File(DIR_CACHE).mkdirs();
new File(DIR_TEMP).mkdirs();
new File(DIR_FINAL).mkdirs();
DownloadManager.initialize();
}
最佳答案
记住将此权限添加到您的AndroidManifest.xml
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />