Android------openfileinput, openfileoutput get data from your phone's memory

Openfileoutput and Openfileinput get the files in the phone's memory instead of the SD card.

The context provides two ways to open the file I/O stream in the Data folder of this application.

Openfileinput (String name): the input stream corresponding to the name file

Openfileoutput (String name,int mode): the output stream corresponding to the name file

The second parameter in the output stream represents the mode in which the file is opened, or it can be called a permission:

Mode_private: The file can only be read and written by the current program

Mode_append: Open the file as an append, you can append the content

Mode_world_readable: The contents of this file can be read by other programs

Mode_world_writeable: The contents of this file can be read and written by other programs.

In addition to this, the context provides several ways to access the application's Data folder:

Getdir (String name,int mode): Gets or creates a subdirectory of name in the application's Data folder

File Getfilesdir (): Gets the absolute path of the application's Data folder

String[] FileList (): Returns all files under the Data folder of the application

DeleteFile (String): Deletes the specified file under the Data folder of the application

public class Mainactivity extends Activity {private EditText et;private Button Savebutton, Readbutton;private TextView Sho W;private Boolean mywrite () {try {FileOutputStream fos = openfileoutput ("Data", context.mode_world_readable); String content = Et.gettext (). toString (); Fos.write (Content.getbytes ()); Fos.flush (); Fos.close (); Toast.maketext (Mainactivity.this, "Success", 1). Show (); return true;} catch (Exception e) {//TODO auto-generated catch Blocke.printstacktrace ();} return false;} Private Boolean Myread () {try {FileInputStream FIS = openfileinput ("Data"); byte buff[] = new byte[1024]; StringBuffer sb = new StringBuffer (), int hasread = 0;while ((hasread = Fis.read (buff))! =-1) {Sb.append (new String (buff)) ;} Fis.close (); Show.settext (sb.tostring ()); Toast.maketext (Mainactivity.this, Sb.tostring (), 1). Show (); return true;} catch (Exception e) {//TODO auto-generated catch Blocke.printstacktrace ();} return false;} protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); setContentview (r.layout.activity_main); et = (EditText) Findviewbyid (r.id.edittext); Savebutton = (Button) Findviewbyid ( R.id.save) Readbutton = (Button) Findviewbyid (r.id.red); show = (TextView) Findviewbyid (r.id.show); Savebutton.setonclicklistener (New Onclicklistener () {@Overridepublic void OnClick (View v) {//TODO auto-generated Method Stubmywrite ();}}); Readbutton.setonclicklistener (New Onclicklistener () {@Overridepublic void OnClick (View v) {//TODO auto-generated Method Stubmyread ();}});}}

Android------openfileinput, openfileoutput get data from your phone's memory