Android 数据存储

核心提示：15.16. @Override17. public void onCreate(Bundle savedInstanceState) {18. super.onCreate(savedInstanceState);19. setContentView(R.layout.main);20.21. //Find VIew

15.

16. @Override

17. public void onCreate(Bundle savedInstanceState) {

18. super.onCreate(savedInstanceState);

19. setContentView(R.layout.main);

20.

21. //Find VIew

22. field_name = (EditText) findViewById(R.id.name); //首先获取用来输入用户名的组件

23. filed_pass = (EditText) findViewById(R.id.password); //同时也需要获取输入密码的组件

24.

25. // Restore preferences

26. SharedPreferences settings = getSharedPreferences(SETTING_INFOS, 0); //获取一个 SharedPreferences对象

27. String name = settings.getString(NAME, ""); //取出保存的 NAME

28. String password = settings.getString(PASSWORD, ""); //取出保存的 PASSWORD

29.

30. //Set value

31. field_name.setText(name); //将取出来的用户名赋予field_name

32. filed_pass.setText(password); //将取出来的密码赋予filed_pass

33. }

34.

35. @Override

36. protected void onStop(){

37. super.onStop();

38.

39. SharedPreferences settings = getSharedPreferences(SETTING_INFOS, 0); //首先获取一个 SharedPreferences对象

40. settings.edit()

41. .putString(NAME, field_name.getText().toString())

42. .putString(PASSWORD, filed_pass.getText().toString())

43. .commit();

44. } //将用户名和密码保存进去

45.

46. }

package com.demo; import android.app.Activity; import android.content.SharedPreferences; import android.os.Bundle; import android.widget.EditText; public class SharedPreferencesDemo extends Activity { public static final String SETTING_INFOS = "SETTING_Infos"; public static final String NAME = "NAME"; public static final String PASSWORD = "PASSWORD"; private EditText field_name; //接收用户名的组件 private EditText filed_pass; //接收密码的组件 @Override