android登录简单窗口

                    下面是原代码：
            packagecom.smart.db;
            
            importandroid.content.Context;
            importandroid.database.sqlite.SQLiteDatabase;
            importandroid.database.sqlite.SQLiteOpenHelper;
            
            publicclassSQLiteextendsSQLiteOpenHelper{
            publicstaticfinalStringTB_NAME="smrtDataBase";
            //构造方法
            publicSQLite(Contextcontext){
            
            super(context,TB_NAME,null,1);
            }
            
            /**
            *创建数据库表
            */
            @Override
            publicvoidonCreate(SQLiteDatabasedb){
            db.execSQL("CREATETABLEusers(userIdintegerprimarykeyautoincrement,namevarchar(20),passwordvarchar(20))");
            }
            
            /**
            *当检测与前一次创建数据库版本不一样时，先删除表再创建新表
            */
            @Override
            publicvoidonUpgrade(SQLiteDatabasedb,intoldVersion,intnewVersion){
            db.execSQL("DROPTABLEIFEXISTSusers");
            onCreate(db);
            }
            
            
            
            
            
            
            
            }
            packagecom.smart.db;
            
            importandroid.content.ContentValues;
            importandroid.content.Context;
            importandroid.database.Cursor;
            importandroid.database.sqlite.SQLiteDatabase;
            
            publicclassUserImpl{
            privateSQLitesqlite;
            privateContextcontent;
            privateSQLiteDatabasedb;
            
            publicUserImpl(Contextcontext){
            
            sqlite=newSQLite(context);
            }
            //登录方法
            publicCursorlogin(Stringname,Stringpwd){
            SQLiteDatabasedatabase=sqlite.getReadableDatabase();
            CursormCursor=database.query(true,"users",newString[]{"name"},
            "name=?andpassword=?",newString[]{name,pwd},null,
            null,null,null);
            returnmCursor;
            }
            //保存方法
            publicbooleansave(Stringname,Stringpassword){
            SQLiteDatabasedatabase=sqlite.getWritableDatabase();
            ContentValuesvalues=newContentValues();
            values.put("name",name);
            values.put("password",password);
            //必须添加记录,除了主键之处，其它都要null
            database.insert("users","name",values);
            returntrue;
            }
            
            }
            packagecom.smart.loginActivity;
            
            importcom.smart.db.UserImpl;
            
            importandroid.app.Activity;
            importandroid.database.Cursor;
            importandroid.os.Bundle;
            importandroid.util.Log;
            importandroid.view.View;
            importandroid.view.View.OnClickListener;
            importandroid.widget.Button;
            importandroid.widget.EditText;
            importandroid.widget.Toast;
            
            publicclassLoginMainextendsActivity{
            
            privatestaticfinalStringTAG="LoginMain";
            privateButtonok;
            privateButtonexit;
            privateEditTextname;
            privateEditTextpassword;
            
            @Override
            publicvoidonCreate(BundlesavedInstanceState){
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);//得到控件
            ok=(Button)findViewById(R.id.ok);
            exit=(Button)findViewById(R.id.exit);
            name=(EditText)findViewById(R.id.username);
            password=(EditText)findViewById(R.id.password);
            ok.setOnClickListener(newOnClickListener(){//方法编写
            @Override
            publicvoidonClick(Viewv){
            Log.i(TAG,name.getText().toString()+"<----passord---->"
            +password.getText().toString());
            try{
            UserImplimpl=newUserImpl(LoginMain.this);
            Cursorcursor=impl.login(name.getText().toString(),password.getText().toString());//得到记录
            if(cursor.moveToNext()){//进行判断数据库当中是否有记得
            Toast.makeText(LoginMain.this,"成功登录！",Toast.LENGTH_LONG)
            .show();
            
            }else{
            Toast.makeText(LoginMain.this,"你的用户名或密码错误，请重新输入",
            Toast.LENGTH_LONG).show();
            name.setText("");
            password.setText("");
            }
            }catch(Exceptione){
            Log.i(TAG,"报错了");
            }
            
            }
            });
            //取消
            exit.setOnClickListener(newOnClickListener(){
            @Override
            publicvoidonClick(Viewv){
            
            Log.i(TAG,name.getText().toString()+"<----passord---->"
            +password.getText().toString());
            Toast.makeText(LoginMain.this,"你点击了取消!",Toast.LENGTH_LONG)
            .show();
            finish();
            }
            });
            }
            }
            <?xmlversion="1.0"encoding="utf-8"?>
            <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
            android:orientation="vertical"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            >
            <LinearLayoutandroid:orientation="horizontal"android:layout_width="wrap_content"android:layout_height="wrap_content">
            
            <TextView
            android:layout_width="100dip"
            android:layout_height="wrap_content"
            android:text="@string/userName"
            />
            <EditText
            android:layout_width="200dip"
            android:layout_height="wrap_content"
            android:textSize="15dip"
            android:id="@+id/username"
            />
            </LinearLayout>
            <LinearLayoutandroid:orientation="horizontal"android:layout_width="wrap_content"android:layout_height="wrap_content">
            
            <TextView
            android:layout_width="100dip"
            android:layout_height="wrap_content"
            android:text="@string/userPwd"
            />
            <EditText
            android:layout_width="200dip"
            android:layout_height="wrap_content"
            android:textSize="15dip"
            android:id="@+id/password"
            android:password="true"
            />
            
            </LinearLayout>
            
            <LinearLayoutandroid:orientation="horizontal"android:layout_width="wrap_content"android:layout_height="wrap_content">
            <Button
            
            android:layout_width="100dip"
            android:layout_height="wrap_content"
            android:text="@string/ok"
            android:id="@+id/ok"
            />
            
            <Button
            
            android:layout_width="100dip"
            android:layout_height="wrap_content"
            android:text="@string/exit"
            android:id="@+id/exit"
            />
            </LinearLayout>
            </LinearLayout>
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