how to undo deleted files on android

Android uses the AsyncHttpClient framework to upload files and uses HttpURLConnection to download files. The android-async-http open-source framework of AsyncHttpClient is very convenient. The AsyncHttpClient class is usually used in android applications to create asynchrono

);} Fis.close (); return tohexstring (Md5.digest ());} catch (Exception e) {System.out.println ("error"); return null;}} 16 binary converted to string public static string tohexstring (byte[] b) {char hex_digits[] = {' 0 ', ' 1 ', ' 2 ', ' 3 ', ' 4 ', ' 5 ', ' 6 ', ' 7 ', ' 8 ', ' 9 ', ' A ', ' B ', ' C ', ' D ', ' E ', ' F '}; StringBuilder sb = new StringBuilder (B.length * 2); for (int i = 0; i The use of asynchttpclient can also be uploaded, downloaded,

Some time ago, I processed Android music file information. I checked online and found that the Android system provided mediascanner, mediaprovider, mediastore, and other interfaces and provided a set of database tables, share content to users through content provider. Description: [Android data is private] data can be shared through the content provider method. I

Secondary packaging of Android apps (APK files), Android apk Many developers, whether individual or company, do not pay much attention to the security of their own applications, that is, whether the code will be tampered with by criminals, malicious code insertion, spam ads, or even theft of user information. I did not care too much, but I did not find the severi

This article is an example of the filtering of the Android project redundant resources file solution, very practical value! The detailed description is as follows: Many developers often experience this in the development process of Android projects: interface developers released a new version of the resource bundle, but some of the image name changed, and some pictures were

In the development of Android project, the project uses to JNI development, use C + + to write own so library, debug and run all normal, android.mk file code is as follows: Local_path: = $ (call My-dir) include $ (clear_vars) local_module:=observer local_src_files:=observer.c local_c_includes:= $ (local_path)/include Local_ldlibs + +-l$ (sysroot)/usr/lib-llog include $ (build_shared_library) If we need to introduce other third-party so l

Preface: The previous article wrote the use of Sharedpreferences in Android to save data, sharedpreferences when saving data is mainly to save some application settings information or a small amount of user information, And it is the information of the string class saved in the form of Key-value, which is more limited. For example, you need to save the image from the network to local as the cache data, and the number is large, sharedpreferences can no