Android——SharedPreferences

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SharedPreferences （接口）保存的数据类似于配置信息格式的数据简单的key-value对

实例：

通过SharedPreferences保存用户名和密码：

package com.example.login;import com.example.loginservice.LoginService;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.Button;import android.widget.CheckBox;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends Activity {private Button btn1;private CheckBox cb1;private EditText edt1;private EditText edt2;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);btn1=(Button)findViewById(R.id.btn1);cb1=(CheckBox)findViewById(R.id.cb1);edt1=(EditText)findViewById(R.id.edit1);edt2=(EditText)findViewById(R.id.edit2);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();if (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}public void login(View v){String username=edt1.getText().toString().trim();String password=edt2.getText().toString().trim();if("".equals(password)||"".equals(username)){Toast.makeText(MainActivity.this, "用户名或者密码不能为空！", 0).show();;}else{if(cb1.isChecked()){LoginService.saveUserInfo(this, username, password);Toast.makeText(MainActivity.this, "保存用户信息成功！", 0).show();}if("123".equals(username)&&"123".equals(password)){Toast.makeText(MainActivity.this, "登陆成功！", 0).show();}elseToast.makeText(MainActivity.this, "登陆失败！", 0).show();}}}

package com.example.loginservice;import android.R.bool;import android.content.Context;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;public class LoginService {publicstatic void saveUserInfo(Context context,String username,String password){SharedPreferences sp=context.getSharedPreferences("config", Context.MODE_PRIVATE);//接口 通过Context提供的getSharedPreferences方法创建实例Editor editor=sp.edit();//获取Editor对象editor.putString("username", username);//写入数据editor.putString("password", password);editor.commit();//提交}}

运行结果：

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