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> 本文转自 llb988 51CTO博客，原文链接：http://blog.51cto.com/llb988/531777，如需转载请自行联系原作者
