SharedPreferences用法笔记

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通常的步骤：

1. 调用getSharedPreferences()获取SharedPreferences对象；

2. 读取数据：调用SharedPreferences()的getX()方法；

3. 写数据：调用SharedPreferences()的edit()方法，进而putX()，最后commit()。

代码示例：

public class MainActivity extends ActionBarActivity {private final String TAG = "MainActivity";private final String SHARED_PREFERENCES_NAME = "the_shared_preferences_name";private final String PET_NAME = "pet_name";private final String PET_COUNT = "pet_count";TextView imsi = null;     @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.fragment_main/*activity_main*/);        /*if (savedInstanceState == null) {        getSupportFragmentManager().beginTransaction()                    .add(R.id.container, new PlaceholderFragment())                    .commit();        }*/                        SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREFERENCES_NAME, MODE_PRIVATE);        Log.d(TAG, "pet name: " + sharedPreferences.getString(PET_NAME, "puppy"));        Log.d(TAG, "pet count: " + sharedPreferences.getInt(PET_COUNT, 0));        sharedPreferences.edit().putString(PET_NAME, "kitten").putInt(PET_COUNT, 2).commit();        Log.d(TAG, "pet name: " + sharedPreferences.getString(PET_NAME, "puppy"));        Log.d(TAG, "pet count: " + sharedPreferences.getInt(PET_COUNT, 0));    }

运行结果：第一次运行的时候，因为还没有存储数据，所以取到的是缺省值；之后运行，就是代码设置的数据。

flying-bird@flying-bird:~/software/android/adt-bundle-linux-x86-20140321/sdk/platform-tools$ ./adb logcat MainActivity:d *:S--------- beginning of /dev/log/system--------- beginning of /dev/log/mainD/MainActivity    ( 1117): pet name: puppyD/MainActivity    ( 1117): pet count: 0D/MainActivity    ( 1117): pet name: kittenD/MainActivity    ( 1117): pet count: 2D/MainActivity    ( 1117): pet name: kittenD/MainActivity    ( 1117): pet count: 2

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