Android 记住登陆的用户名和密码

package zhuimengren.zhuimengren.ui;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;

/**
* Created by __追梦人 on 2015/3/15.
*/
public class SaveUsernameAndPassword {
private static SaveUsernameAndPassword preference = null;
private SharedPreferences sharedPreference;
private String packageName = "";

private static final String LOGIN_NAME = "loginName"; //登录名
private static final String PASSWORD = "password";  //密码
private static final String IS_SAVE_PWD = "isSavePwd"; //是否保留密码

public static synchronized SaveUsernameAndPassword getInstance(Context context){
if(preference == null)
preference = new SaveUsernameAndPassword(context);
return preference;
}

public SaveUsernameAndPassword(Context context){
packageName = context.getPackageName() + "_preferences";
sharedPreference = context.getSharedPreferences(
packageName, context.MODE_PRIVATE);
}

public String getLoginName(){
String loginName = sharedPreference.getString(LOGIN_NAME, "");
return loginName;
}

public void SetLoginName(String loginName){
Editor editor = sharedPreference.edit();
editor.putString(LOGIN_NAME, loginName);
editor.commit();
}

public String getPassword(){
String password = sharedPreference.getString(PASSWORD, "");
return password;
}

public void SetPassword(String password){
Editor editor = sharedPreference.edit();
editor.putString(PASSWORD, password);
editor.commit();
}

public boolean IsSavePwd(){
Boolean isSavePwd = sharedPreference.getBoolean(IS_SAVE_PWD, false);
return isSavePwd;
}

public void SetIsSavePwd(Boolean isSave){
Editor edit = sharedPreference.edit();
edit.putBoolean(IS_SAVE_PWD, isSave);
edit.commit();
}

}

package zhuimengren.zhuimengren.activity;

import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;

import com.lidroid.xutils.HttpUtils;
import com.lidroid.xutils.exception.HttpException;
import com.lidroid.xutils.http.RequestParams;
import com.lidroid.xutils.http.ResponseInfo;
import com.lidroid.xutils.http.callback.RequestCallBack;
import com.lidroid.xutils.http.client.HttpRequest;

import org.json.JSONObject;

import zhuimengren.zhuimengren.R;
import zhuimengren.zhuimengren.base.BaseActivity;
import zhuimengren.zhuimengren.config.SharedConfig;
import zhuimengren.zhuimengren.dialog.ToastDialog;
import zhuimengren.zhuimengren.fragment.MyDialogFragment;
import zhuimengren.zhuimengren.ui.SaveUsernameAndPassword;
import zhuimengren.zhuimengren.utils.NetUtils;

/**
* Created by __追梦人 on 2015/2/14.
*/
public class LoginActivity extends BaseActivity implements OnClickListener {
private Context context;
private EditText username_edit;
private EditText password_edit;
private CheckBox chk_keep_pwd;
private String Result = null;
private boolean isNetError;
private int count;
private static final int HTTP_OK = 200;
private static String url = "http://218.58.71.13:8057/Login/Index";
public static final int NET_STATE_DIALOG = 0;
public static final int LOGIN_DIALOG = 1;
private MyDialogFragment myDialogFragment;
// private static String url = "http://192.168.0.114:8057/Login/Index";
/**
* 登录loading提示框
*/
private ProgressDialog proDialog;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
context = this;          // 得到网络管理器
init();
if (NetUtils.isOpenNetwork(context) == false) {
//            NetworkDialog.AlertNetworkDialog(this);
myDialogFragment = MyDialogFragment.getInstance(NET_STATE_DIALOG);
if (myDialogFragment != null) {
myDialogFragment.show(getFragmentManager(), "没有可用的网络！");
}
}
}

public void init() {
((Button) findViewById(R.id.clearConfig)).setOnClickListener(this);
((Button) findViewById(R.id.signin_button)).setOnClickListener(this);

username_edit = (EditText) findViewById(R.id.username_edit);
password_edit = (EditText) findViewById(R.id.password_edit);
chk_keep_pwd = (CheckBox) findViewById(R.id.saveUsernameAndPassword_checkbox);
chk_keep_pwd.setChecked(
SaveUsernameAndPassword.getInstance(context).IsSavePwd());
}

@Override
protected void onResume() {
super.onResume();
context = this;
chk_keep_pwd.setChecked(SaveUsernameAndPassword.getInstance(context).IsSavePwd());
if (chk_keep_pwd.isChecked()) {
username_edit.setText(SaveUsernameAndPassword.getInstance(context)
.getLoginName());
password_edit
.setText(SaveUsernameAndPassword.getInstance(context).getPassword());
}
}

private void GetLoginInfo(String username, String password) {

RequestParams params = new RequestParams();
params.addQueryStringParameter("username", username);
params.addQueryStringParameter("password", password);
HttpUtils http = new HttpUtils();
http.configCurrentHttpCacheExpiry(1000 * 10);
http.send(HttpRequest.HttpMethod.POST,
url,
params,
new RequestCallBack<String>() {
@Override
public void onSuccess(ResponseInfo<String> responseInfo) {

boolean loginState = ValidateLogin(responseInfo.result, responseInfo.statusCode);
if (loginState) {
ToastDialog.showShort(LoginActivity.this, "登陆成功!");
Intent intent = new Intent(LoginActivity.this, FragmentTabActivity.class);
startActivity(intent);
finish();
proDialog.dismiss();
} else {
// 通过调用handler来通知UI主线程更新UI,
Message message = new Message();
Bundle bundle = new Bundle();
bundle.putBoolean("isNetError", isNetError);
message.setData(bundle);
loginHandler.sendMessage(message);
}
}

@Override
public void onFailure(HttpException error, String msg) {

}
});
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.clearConfig:
new SharedConfig(LoginActivity.this).ClearConfig();
ToastDialog.showShort(LoginActivity.this, "成功清除!");
break;
case R.id.signin_button:
if (NetUtils.isOpenNetwork(context) == false) {
//                    NetworkDialog.AlertNetworkDialog(LoginActivity.this);
myDialogFragment = MyDialogFragment.getInstance(NET_STATE_DIALOG);
if (myDialogFragment != null) {
myDialogFragment.show(getFragmentManager(), "没有可用的网络！");
}
} else {
proDialog = new ProgressDialog(LoginActivity.this);
proDialog.setTitle("登陆提示");
proDialog.setMessage("登录中,请稍后...");
proDialog.setCancelable(true);
proDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
proDialog.setIndeterminate(false);
proDialog.show();
// 开一个线程进行登录验证,主要是用于失败,成功可以直接通过startAcitivity(Intent)转向
new Thread(new LoginFailureHandler()).start();
}
break;
case R.id.saveUsernameAndPassword_checkbox:
chk_keep_pwd.setChecked(!chk_keep_pwd.isChecked());
break;
}
}

/**
* 是否保存用户名、密码
*/
private void IfSaveUsernameAndPassword(String Username, String Password) {
if (chk_keep_pwd.isChecked()) {
SaveUsernameAndPassword.getInstance(context)
.SetLoginName(Username);
SaveUsernameAndPassword.getInstance(context)
.SetPassword(Password);
SaveUsernameAndPassword.getInstance(context)
.SetIsSavePwd(chk_keep_pwd.isChecked());
} else {
SaveUsernameAndPassword.getInstance(context)
.SetLoginName("");
SaveUsernameAndPassword.getInstance(context)
.SetPassword("");
SaveUsernameAndPassword.getInstance(context)
.SetIsSavePwd(chk_keep_pwd.isChecked());
}
}

private boolean ValidateLogin(String result, int statusCode) {
boolean loginState = false;
try {
JSONObject jsonObject = new JSONObject(result.toString());
Result = jsonObject.get("Status").toString();
if (statusCode != HTTP_OK) {
isNetError = true;
return false;
} else {
if (Result.equals("0")) {
loginState = false;
} else if (Result.equals("1")) {
loginState = true;
}
}
} catch (Exception e) {
}
return loginState;
}

/**
* 登录后台通知更新UI线程,主要用于登录失败,通知UI线程更新界面
*/
Handler loginHandler = new Handler() {
public void handleMessage(Message msg) {
isNetError = msg.getData().getBoolean("isNetError");
if (proDialog != null) {
proDialog.dismiss();
}
if (isNetError) {
ToastDialog.showShort(LoginActivity.this, "登陆失败:\n" +
"1.请检查您网络连接.\n" +
"2.请联系我们.!");
} else {
ToastDialog.showShort(LoginActivity.this, "登陆失败,请输入正确的用户名和密码!");
}
}
};

class LoginFailureHandler implements Runnable {
@Override
public void run() {
//获取用户名、密码
String UserName = username_edit.getText().toString().trim();
String Password = password_edit.getText().toString().trim();
IfSaveUsernameAndPassword(UserName, Password);
GetLoginInfo(UserName, Password);
}
}
}