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;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (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textview
ArrayAdapter<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() {
@Override
public 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();
}
}
}
}
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