Android Implementation application only displays the boot interface on first boot

Overview

The sharedpreferences is simple to use and can easily store data and read data. sharedpreferences can save only simple types of data, such asString,int , and so on. It is common to convert data of complex types to Base64 encoding, and then save the converted data as a string in an XML file, and then use the Sharedpreferences Save.

     use sharedpreferences save key-value

1 ) use activity getsharedpreferences method get sharedpreferences key-value The name of the file is determined by the getsharedpreferences The first parameter of a method is specified.

2 ) use sharedpreferences interface edit get sharedpreferences.editor object.

3 ) through sharedpreferences.editor interface putxxx method Save key-value Yes. where xxx represents different data types. For example: String type value needed putstring method.

(4) save Key-value by the commit method of the sharedpreferences.editor interface that 's right. the Commit method is equivalent to a commit operation in a database transaction.

Use steps

The writing process for the specific code is:

A, storage data information

1.Open Preferences, name is setting, if present, open it, otherwise create a new Preferences

Sharedpreferences Settings = getsharedpreferences("Setting", 0);

2, let setting in the editing state

Sharedpreferences. Editor Editor = settings. Edit();

3. Store Data

Editor. Putstring("name","Ataaw");

Editor. Putstring("URL","Ataaw". COM ");

4. Complete the submission

Editor. Commit();

B, read data information

1. Get Preferences

Sharedpreferences Settings = getsharedpreferences("Setting", 0);

2. Take out the data

String name = settings. GetString("name"," default value ");

String URL = setting. GetString("URL","Default");

// above is android file storage location can be in eclipse view:

DDMS-File Explorer /< package name>/shared_prefs/setting . Xml

Demoprivate void Toastdisplay () {
First Use Display prompt control
Preferences = Getsharedpreferences ("Count", 0); exists then open it, otherwise create a new preferences
int count = Preferences.getint ("Count", 0); Remove data
if (count = = 0) {//Judge the program with the first run, or jump to the boot page if the
Toastinit ();
Sharedpreferences.editor Editor = Preferences.edit (); Make preferences in edit state
Editor.putint ("Count", 1); Deposit data
Editor.commit (); Submit Changes
}
}


private void Toastinit () {
Initial use display Toast prompt set gesture
Toast toast = Toast.maketext (This,
"Please set your gesture for first used", Toast.length_long);
Toast.setgravity (Gravity.center_horizontal | Gravity.bottom, 0, 0);
Toast.setmargin (0f, 0.1f);
Toast.show ();
}

Ref

http://blog.csdn.net/pipisorry/article/details/26874145

http://blog.csdn.net/wxyyxc1992/article/details/17222841

http://blog.csdn.net/t80t90s/article/details/7925541

http://blog.csdn.net/listening_music/article/details/6611786