1 package com.example.dbtest;
  2 
  3 import android.app.Activity;
  4 import android.app.AlertDialog;
  5 import android.app.AlertDialog.Builder;
  6 import android.content.DialogInterface;
  7 import android.content.Intent;
  8 import android.database.Cursor;
  9 import android.database.sqlite.SQLiteDatabase;
 
 10 import android.database.sqlite.SQLiteException;
 11 import android.database.sqlite.SQLiteOpenHelper;
 12 import android.os.Bundle;
 13 import android.view.View;
 14 import android.view.View.OnClickListener;
 15 import android.widget.Button;
 16 import android.widget.EditText;
 17 import android.widget.Toast;
 
 18 
 19 public class MainActivity extends Activity {
 20 
 21     private EditText et_id, et_name;
 22     private Button btn_test, btn_local;
 23                   //1,SQLite的宣告
 24     SQLiteOpenHelper helper;
 25     private String _id;
 26     private String _name;
 27 
 28     @Override
 29     protected
 
 void onCreate(Bundle savedInstanceState) {
 30         super.onCreate(savedInstanceState);
 31         setContentView(R.layout.activity_main);
 32         // 2，資料庫的建立，及呼叫
 33         helper = new Sqliteopenhelper(this);
 34         helper.getWritableDatabase();
 35 
 36         et_id = (EditText) findViewById(R.id.editText1);
 37         et_name = (EditText) findViewById(R.id.editText2);
 38         btn_test = (Button) findViewById(R.id.button1);
 39         btn_local = (Button) findViewById(R.id.button2);
 40 
 41         btn_test.setOnClickListener(new testListener());
 42         btn_local.setOnClickListener(new localListener());
 43 
 44     }
 45 
 46     class testListener implements OnClickListener {
 47 
 48         @Override
 49         public void onClick(View v) {
 50             // TODO Auto-generated method stub
 51     Intent intent = new Intent(MainActivity.this, Register.class);
 52             startActivity(intent);
 53         }
 54 
 55     }
 56          //登陸按鈕
 57 
 58     class localListener implements OnClickListener {
 59 
 60         @Override
 61         public void onClick(View v) {
 62             // TODO Auto-generated method stub
 63             _id = et_id.getText().toString();
 64             _name = et_name.getText().toString();
 65             if (_name.equals("") || _id.equals("")) {         Toast.makeText(getApplicationContext(), "請輸入賬號密     碼！",Toast.LENGTH_SHORT).show();
 66             } else {
 67                 sureuser(_id, _name);
 68             }
 69         }
 70 
 71     }
 72 
 73     private void sureuser(String userid, String username) {
 74                  //3,資料庫的操作，查詢
 75     SQLiteDatabase sdb = helper.getReadableDatabase();
 76         try {
 77     String sql = "select * from student where id=? and name=?";
 78             // 實現遍歷id和name
 79     Cursor cursor = sdb.rawQuery(sql, new String[] { _id, _name });
 80             if (cursor.getCount() > 0) {
 81     Intent intent = new Intent(MainActivity.this, User.class);
 82         Bundle bundle = new Bundle();
 83             bundle.putString("name", _name);
 84                 intent.putExtras(bundle);
 85                 startActivity(intent);
 86             } else {
 87         Toast.makeText(getApplicationContext(), "登入失敗",
 88                         Toast.LENGTH_SHORT).show();
 89             }
 90             cursor.close();
 91             sdb.close();
 92         } catch (SQLiteException e) {
 93     oast.makeText(getApplicationContext(), "親，請註冊！",
 94                     Toast.LENGTH_SHORT).show();
 95         }
 96     }
 97 
 98 
 99         
100     
101 }