Android Project Combat-recite the word dev01-copy Word book realization

This article explains

Now we are formally entering the function and code analysis

The main function of the interpretation of it.

Copy a word book function in the first interface

That is, in the Welcome interface welcomeactivity

The overall architecture of the project is the MVC pattern

Only display data is called in the UI primarily

The real data processing logic is behind the client.

Then first introduce the UI and process, and then describe the background copy of the Word book function.

Effect

Execution flowchart

Process Detail Description

1> need to check the word book first

First, you need to check whether there is a word book file in the SDcard, it does not exist to copy

private void Checkwordbookfiles () {       Boolean result = Resmanager.checkwordbookfiles ();       if (!result) {           Toast.maketext (context,                  "Word book db file not present-prepare copy", Toast.length_long). Show ();           Copy the word book           installwordbookfiles ();       } else {           Toast.maketext (context, "There is a                  Word book db file-prepare to check the Learning Plan", Toast.length_long). Show ();
           Check the Learning Plan           checkstudyplanfiles ();       }}

　　

2> Copy the Word book Method

Need progress bar hint, then copy Word book need to manipulate SQLite database

The time-consuming operation must be done in multiple threads, otherwise the master UI will be stuck.

private void Installwordbookfiles () {       installwordbookfilesprogressdialog.setmessage ("Initializing Word Data");       Installwordbookfilesprogressdialog.setmax (wordbookconstant.allwordbookfilebytelength);       Installwordbookfilesprogressdialog.show ();       Thread installwordbookfilesthread = new Thread (new Installwordbookfilesthread ());       Installwordbookfilesthread.start ();}

　　

3> copy a word book thread

Here the thread class implements the inner class of the Runnable interface, invoking the resource management copy of the Word book method

Class Installwordbookfilesthread implements Runnable {       @Override public       void Run () {           resmanager.init ( context, installwordbookfilesprogressdialog);           Resmanager.installwordbookfiles ();           Myhandler.sendemptymessage (0);}    }

　　

Background copy Word book function detailed

This function is applied to the resource management module Resmanager

1> Copy all file functions

public static void Installwordbookfiles () {try {//Create project directory file Path = new file (Pathconstant.wdbook_path);              if (path.exists () = = False) {LOG.D ("Vrbword", "path didn ' t exist, creating!!!");           Path.mkdirs (); }//Install file Installfile (Wordbookconstant.dict_str + ". SMF", Pathconstant.wdbook_path + "           /"+ wordbookconstant.dict_str);           Installfile (WORDBOOKCONSTANT.CET4_STR, Pathconstant.wdbook_path + "/" + wordbookconstant.cet4_str);            Installfile (WORDBOOKCONSTANT.CET6_STR, Pathconstant.wdbook_path + "/" + wordbookconstant.cet6_str); Installfile (WORDBOOKCONSTANT.KAOYAN_STR, Pathconstant.wdbook_path + "/" + Wordbookconstant.kao           YAN_STR);           Installfile (WORDBOOKCONSTANT.TOFEL_STR, Pathconstant.wdbook_path + "/" + wordbookconstant.tofel_str); Installfile (Wordbookconstant.ielts_str, PathconStant.           Wdbook_path + "/" + wordbookconstant.ielts_str);    Installfile (WORDBOOKCONSTANT.GRE_STR, Pathconstant.wdbook_path + "/" + wordbookconstant.gre_str);    } catch (Exception e) {e.printstacktrace (); }}

a> First to create the project directory, is copied from the assets directory to the SDcard directory, you can use the constant class constant to determine the directory.

b> Directory is created, you can copy it in sequence.

The installfile(from, dest) method is used here to copy a single file

2> Copy File function

Copy a single file

is to copy the specified file data from the assets directory to a file in the specified directory of SDcard

private static void Installfile (string from, String dest) throws Exception {        //judgment file        fp = new files (dest);        if (!fp.exists () | | fp.length () < * 1024x768) {        //determine out and in stream        inputstream in = Context.getassets (). open (from); 
   outputstream out = new FileOutputStream (FP);        byte[] buf = new Byte[operatefilebytelength]        for each read and write section while ( -1! = In.read (buf)) {            out.write (BUF);            Sleep can enhance the progress display effect            SYSTEMUTIL.SLEEPVD (5);            Continuously set the progress value            Progressvalue + = operatefilebytelength;            Myprogressdialog.setprogress (Progressvalue);        }        Close in and out stream        in.close ();        Out.close ();    }}                           

a> First to determine the file size, the file exists and the file satisfies the size condition to copy

b> then determines the out and in streams, and writes the read data to the file according to the specified byte length.

c> here used to sleep just to show better

d> Each time a specified byte of data is written, the progress value is incremented and displayed in a custom dialog box.

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Android Project Combat-recite the word dev01-copy Word book realization