Android开发相关：(02)使用首选项保存活动的状态

[java] final String INITIALIZED = "initialized";
SharedPreferences myPrefs = getPreferences(MODE_PRIVATE);

boolean hasPreferences = myPrefs.getBoolean(INITIALIZED, false);
if (hasPreferences) {
    Log.v("Preferences", "We've been called brefore");
    // Read other values as desired from preferences file...  
    someString = myPrefs.getString("someString", "");
} else {
    Log.v("Preferences", "First time ever being called");
    // Set up initial values for what will end up  
    // in the preferences file  
    someString = "Some default value";
}
// Later when ready to write out values  
Editor editor = myPrefs.edit();
editor.putBoolean(INITIALIZED, true);
editor.putString("someString", someString);
// Write other values as desired  
editor.commit();