android 登录界面 记住多组账号与密码

android

package com.android_login;import java.util.ArrayList;import java.util.List;import java.util.Map;import android.app.Activity;import android.content.SharedPreferences;import android.graphics.drawable.ColorDrawable;import android.os.Bundle;import android.util.Log;import android.view.Gravity;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup.LayoutParams;import android.view.WindowManager;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ArrayAdapter;import android.widget.Button;import android.widget.CheckBox;import android.widget.EditText;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.PopupWindow;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity implements OnClickListener {private ImageView select;private PopupWindow pw;private int width, i;private LinearLayout parent, option;private EditText et_user, et_pwd;private ListView listView;private Button login;private CheckBox checkBox;private SharedPreferences sPreferences;private Map<String, String> map;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);init();}@Overridepublic void onClick(View v) {// TODO Auto-generated method stubswitch (v.getId()) {case R.id.select://为什么x正方向偏移不了？？？当取负时就可以，有人可以解释下吗pw.showAsDropDown(parent, 15, -4);break;case R.id.login:login();break;}}private void init() {et_user = (EditText) findViewById(R.id.et_user);et_pwd = (EditText) findViewById(R.id.et_pwd);parent = (LinearLayout) findViewById(R.id.llayout);select = (ImageView) findViewById(R.id.select);login = (Button) findViewById(R.id.login);checkBox = (CheckBox) findViewById(R.id.checkBox1);select.setOnClickListener(this);login.setOnClickListener(this);//读取已经记住的用户名与密码sPreferences = getSharedPreferences("session", MODE_PRIVATE);map = (Map<String, String>) sPreferences.getAll();List<String> list = new ArrayList<String>();for (int i = 0; i < (map.size()/2); i++) {String name = sPreferences.getString("name"+ i,"");list.add(name);}// 用4个参数的指定，哪个listview中的textviewArrayAdapter<String> adapter = new ArrayAdapter<String>(this,R.layout.items, R.id.item, list);option = (LinearLayout) getLayoutInflater().inflate(R.layout.option,null);// 要在这个linearLayout里面找listView......listView = (ListView) option.findViewById(R.id.op);listView.setAdapter(adapter);//获取屏幕的宽度并设置popupwindow的宽度为width,我这里是根据布局控件所占的权重WindowManager wManager = (WindowManager) getSystemService(this.WINDOW_SERVICE);width = wManager.getDefaultDisplay().getWidth() * 4 / 5;//实例化一个popupwindow对象pw = new PopupWindow(option, width, LayoutParams.WRAP_CONTENT, true);ColorDrawable dw = new ColorDrawable(00000);pw.setBackgroundDrawable(dw);pw.setOutsideTouchable(true);listView.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> adapterView, View view,int position, long id) {// 获取选中项内容及从sharePreferences中获取对应的密码String username = adapterView.getItemAtPosition(position).toString();String pwd = sPreferences.getString("pwd"+ position,"");et_user.setText(username);et_pwd.setText(pwd);// 选择后，popupwindow自动消失pw.dismiss();}});}private void login() {// 若是第二次打开软件时，将map在size赋给i,若是不是,则i只要实现i++if (i == 0) {i = map.size()/2;}// 若有勾选记住，则保存if (checkBox.isChecked()) {String name = et_user.getText().toString().trim();String pwd = et_pwd.getText().toString().trim();if (!"".equals(name) && !"".equals(pwd)) {sPreferences.edit().putString("name"+ i, name).putString("pwd"+ i, pwd).commit();i++;Toast.makeText(this,"用户名与密码已经记住，下次进入软件时将生效！",0).show();}}}}