Android简单的增删查改源码

package com.zuxia.test; import android.app.Activity; import android.content.Intent; import android.content.SharedPreferences; import android.content.SharedPreferences.Editor; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.CheckBox; import android.widget.EditText; public class DBDemoActivity extends Activity implements OnClickListener { Button myBtn = null; CheckBox userChk = null; EditText userNameEdit = null; EditText userPwdEdit = null; //xml文档对象 SharedPreferences sp = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //获取对象 myBtn = (Button)findViewById(R.id.myBtn); userChk = (CheckBox) findViewById(R.id.userChk); userNameEdit = (EditText) findViewById(R.id.userNameEdit); userPwdEdit = (EditText) findViewById(R.id.userPwdEdit); sp = getSharedPreferences("user", 0); String username = sp.getString("name", ""); String userpwd = sp.getString("pwd", ""); userNameEdit.setText(username); userPwdEdit.setText(userpwd); if(!"".equals(username)) { userChk.setChecked(true); } //绑定 myBtn.setOnClickListener(this); } public void onClick(View v) { /* * * 判断复选框是否选中 * 1，如果选中，将用户名和密码保存到xml * 2，如果未选中，则将用户和密码重置为空 * * */ String username = userNameEdit.getText().toString(); String userpwd = userPwdEdit.getText().toString(); if(userChk.isChecked() == true ){ //存储数据 Editor ed = sp.edit(); ed.putString("name", username); ed.putString("pwd", userpwd); //提交 ed.commit(); }else{ //存储数据 Editor ed = sp.edit(); ed.putString("name", ""); ed.putString("pwd", ""); //提交 ed.commit(); } if("admin".equals(username) && "123456".equals(userpwd)){ Intent it = new Intent(this,OtherActivity.class); startActivity(it); } } }