sharedPreferences 为全局变量
sharedPreferences = this.getSharedPreferences("test", MODE_PRIVATE);
String name= sharedPreferences.getString("name", "");
Toast t = new Toast(this);
t.makeText(this, name, 1).show();
使用保存数据
SharedPreferences.Editor edit = sharedPreferences.edit();
edit.putString("name", dt.getText().toString());
edit.commit();
来自为知笔记(Wiz)