十年磨一剑笔记android基础day03ui控件

androidsqloop//publicvoidadd(ViewDatabasedbhelper.getWritableDatabase();//获取一个可写的数据库//insert ",,}}publicvoidupdate(ViewDatabasedbhelper.getWritableDatabase();//获取一个可写的数据库ContentValuesvalues=newContentValues();values.put("name","");StringwhereClause="_id=String[]whereArgs=newString[]{"3"};db.update("",values,whereClause,whereArgs);}}publicvoidquery(ViewDatabasedb=helper.getReadableDatabase();table表columns查询列selection查询条件selectionArgs查询参数groupBy分组having分组条件orderByCursorcursor=db.query("",newString[]{"*"},null,null,null,null,null);int_id=Stringname=cursor.getString(cursor.getColumnIndex("name"));Log.i(TAG,"_id:"+_id+",name:"+name);}}}publicvoiddelete(ViewDatabasedbhelper.getWritableDatabase();//获取一个可写的数据库StringwhereClause="_id=String[]whereArgs=newString[]{"3"};db.delete("",whereClause,whereArgs);}}修改数据库的版本号OpenHelper工具要 表添加一个新的字段account:账例子:鸡哥找借钱 ListView来专门处理列表数据条目的显示。(掌握)listviewBaseAdapterpublicclassMainActivityextendsActivityprotectedvoidonCreate(BundlesavedInstanceState){ListViewlv=(ListView)//给listViewpublicViewgetView(intposition,ViewconvertView,ViewGroupparent){TextViewtvnewTextView(getApplicationContext());//创建一个TextViewtv.setText("我人，我喜欢人:"+position);if(position20){}return}publiclonggetItemId(intposition){return0;}publicObjectgetItem(intposition){returnnull;}publicintgetCount(){return30;}}}布局加载 打气查 SimpleAdapter简单适配

这样的效果就是可以ArrayAdapterSimpleAdapter

普通提醒用提醒用 瓦工：把所有的材料、钱房子所有：要创建框就需要先构建：Builder对象