android 登入介面 記住多組賬號與密碼
阿新 • • 發佈:2019-01-04
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: //為什麼x正方向偏移不了???當取負時就可以,有人可以解釋下嗎 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); //讀取已經記住的使用者名稱與密碼 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個引數的指定,哪個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); // 要在這個linearLayout裡面找listView...... listView = (ListView) option.findViewById(R.id.op); listView.setAdapter(adapter); //獲取螢幕的寬度並設定popupwindow的寬度為width,我這裡是根據佈局控制元件所佔的權重 WindowManager wManager = (WindowManager) getSystemService(this.WINDOW_SERVICE); width = wManager.getDefaultDisplay().getWidth() * 4 / 5; //例項化一個popupwindow物件 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) { // 獲取選中項內容及從sharePreferences中獲取對應的密碼 String username = adapterView.getItemAtPosition(position) .toString(); String pwd = sPreferences.getString("pwd"+ position,""); et_user.setText(username); et_pwd.setText(pwd); // 選擇後,popupwindow自動消失 pw.dismiss(); } }); } private void login() { // 若是第二次開啟軟體時,將map在size賦給i,若是不是,則i只要實現i++ if (i == 0) { i = map.size()/2; } // 若有勾選記住,則儲存 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,"使用者名稱與密碼已經記住,下次進入軟體時將生效!",0).show(); } } } }