Read File Content

To open a file that is private to the application in the/data/<package name>/Files directory, you can use the openfileinput () method provided by activity. Fileinputstream instream = This. getcontext (). openfileinput ("itcast.txt"); log. I ("filetest", readinstream (instream); The readinstream () method can be found below.

public static String readInStream(FileInputStream inStream){try {ByteArrayOutputStream outStream = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int length = -1;while((length = inStream.read(buffer)) != -1 ){outStream.write(buffer, 0, length);}outStream.close();inStream.close();return outStream.toString();//byte[] data=outStream.toByteArray();
                                            //String result=new String(data);
             } catch (IOException e) {Log.i("FileTest", e.getMessage());}return null;}

 

Or directly use the absolute path of the file: file = new file ("/data/CN. itcast. action/files/itcast.txt "); fileinputstream instream = new fileinputstream (File); log. I ("filetest", readinstream (instream); note: the "CN. itcast. action is the package where the application is located. When writing code, you should replace it with the package used by your own application. Only applications that create a private file can access the file. If you want the file to be read and written by other applications, you can specify the context. mode_world_readable and context. mode_world_writeable permissions when creating the file. Activity also provides the getcachedir () and getfilesdir () Methods: getcachedir () methods for obtaining/data/<package name>/cache directory getfilesdir () to obtain the/data/<package name>/Files directory.