sharedpreferencestest

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学习目的：1.获取sharedpreferences对象的三种方法

1.获取sharedpreferencestest对象的三种方法

  • Context类中的getsharedpreferences（）
  • Activity类中的getDefaulsharedpreferences()

  • PreferenceManager类中的getDefaulsharedpreferences()

  • 范例

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    public class MainActivity extends AppCompatActivity {

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            Button saveData = (Button) findViewById(R.id.save_data);
            saveData.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    SharedPreferences.Editor editor = getSharedPreferences("data", MODE_PRIVATE).edit();//data文件名
                    editor.putString("name", "Tom");//存储String数据
                    editor.putInt("age", 28);//存储Int数据
                    editor.putBoolean("married", false);//存储Boolean数据
                    editor.apply();
                }
            });
    }

  • 读取数据

Button restoreData = (Button) findViewById(R.id.restore_data);
       restoreData.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {
               SharedPreferences pref = getSharedPreferences("data", MODE_PRIVATE);
               String name = pref.getString("name", "");
               int age = pref.getInt("age", 0);
               boolean married = pref.getBoolean("married", false);
               Log.d("MainActivity", "name is " + name);
               Log.d("MainActivity", "age is " + age);
               Log.d("MainActivity", "married is " + married);
           }
       });
   }