Learn android from scratch (Data Storage (2) Internal Storage. 36 .)

Learn android from scratch (Data Storage (2) Internal Storage. 36 .)

1. CallopenFileOutput()With the name of the file and the operating mode. This returnsFileOutputStream. PassOpenFileOutput () creates a FileoutputStream object
2. Write to the filewrite(). Create a Write object and perform data read/Write operations.
3. Close the streamclose(). Close the link.

   The above describes the basic steps for saving data files to internal storage.

   The following code is used to explain

   Xml file

   
   

   JAVA files

   Package com. example. internalstorage; import java. io. fileInputStream; import java. io. fileNotFoundException; import java. io. fileOutputStream; import java. io. IOException; import android. app. activity; import android. content. context; import android. OS. bundle; import android. util. log; import android. view. view; import android. widget. button; import android. widget. toast; public class MainActivity extends Activity {priv Ate Button saveData, getData; private static final String FILENAME = "flyou.txt"; @ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); saveData = (Button) this. findViewById (R. id. button1); getData = (Button) this. findViewById (R. id. button2); saveData. setOnClickListener (new View. onClickListener () {// save information @ Overridepublic void onCli Ck (View v) {// TODO Auto-generated method stubFileOutputStream out = null; try {String infoString = ""; out = openFileOutput (FILENAME, Context. MODE_PRIVATE); out. write (infoString. getBytes (); Toast. makeText (MainActivity. this, "data saved successfully", 2 ). show ();} catch (FileNotFoundException e) {e. printStackTrace ();} catch (IOException e) {e. printStackTrace ();} finally {try {if (out! = Null) {out. close () ;}} catch (IOException e) {// TODO Auto-generated catch blocke. printStackTrace () ;}}}); // read the information getData. setOnClickListener (new View. onClickListener () {@ Overridepublic void onClick (View v) {// TODO Auto-generated method stubFileInputStream input = null; try {input = openFileInput (FILENAME ); byte [] data = new byte [1024]; int len = input. read (data); input. close (); // System. out. println (new String (data, 0, len); Toast. makeText (MainActivity. this, new String (data, 0, len), 2 ). show ();} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke. printStackTrace ();} catch (IOException e) {// TODO Auto-generated catch blocke. printStackTrace ();}}});}}

   
   
   
   

   Open Information

   
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   View information in a file browser

   
   

   
   

   
   

   Export files

   
   

   Open with notepad

   
   
   

   The above operations can easily implement the internal storage process of files.

   The official api also provides instructions on how to store cached files.

   
   

   Next forecast:

   External Storage