adapter | 易学教程

Access to database zend framework

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问题 I want to access to database "mysql", I read that we can define the db adapter and db configurations by writing these lines in application.ini file resources.db.adapter = MYSQLI resources.db.params.host = localhost resources.db.params.username = root resources.db.params.password =123456 resources.db.params.dbname = visits_db I want to get the $db object in order to use in for executing sql statements $db->insert("inspection_visits_tb", $insepctionVisitData = array( 'day' => $visit->getDay(),

Android fling actions on a RecyclerView

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问题 I was recently playing a little bit with the RecyclerView and the concept of ViewHolder's in Android 5+. The adapter implementation handles quite a large dataset (i.e ~ 60 000 items), requested from the internet upon onBindViewHolder(...) call. The network requests are handled by the volley library and the response represents the data model used to fill up the view holder. Now when fast-flinging (i.e motion with a velocity, different than swipe where a user touches the device and moves slowly

Adapter pattern for IDbSet properties of a DbContext class

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问题 Is there a way to use the method described in this answer No FindAsync() method on IDbSet for DbSet properties of a DbContext? Edit: The answer linked contains a description how to build a interface inheriting from IDbSet and adding support for the SearchAsync method of the DbSet class. I understand everything which Keith Payne has written, but I don’t know how I can use it in DbContext. For example I’ve a DbContext which looks something like this: public class MyContext : DbContext { public

Get recyclerview listener in another class

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问题 I have a main activity that displays an ImageView and below that a RecyclerView . In the adapter for the RecyclerView I implemented onClickListner on the view holder and it is working fine. However I need the click to set the image in the main activity when the button is clicked but I cannot see anyway to implement a listner in the main activity to get the results from the adapter to the main activity. I tried the using the onClick as below but that gives a null pointer exception . class

How to get height of view inside adapter for creating sized bitmap?

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问题 I use custom CursorAdapter with custom items. I need height of view to resize Bitmap from assets folder and set this resized bitmap to ImegeView in list item; @Override public void bindView(View view, final Context context, final Cursor cursor) { final ViewHolder holder = (ViewHolder) view.getTag(); final int imgCol = cursor.getColumnIndex(TableOdelice.COLUMN_URL); int titleCol = cursor.getColumnIndex(TableOdelice.COLUMN_TITRE); final int themeCol = cursor.getColumnIndex(TableOdelice.COLUMN

Should adapters in Android be static inner classes or non-static inner classes

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问题 I have a ListView in an Activity and I am setting a custom adapter to the ListView. Should my adapter class be: private static class MyAdapter extends ArrayAdapter or private class MyAdapter extends ArrayAdapter I guess it should make no difference as long as the adapter is enclosed within the activity reference but wanted to confirm that. 回答1: Holding onto the context is fine from within an adapter if you are careful about how you use the adapter. Adapters are usually tied to the lifecycle

Spinner ArrayAdapter crashing with custom layout

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问题 I am trying to experiment with a custom Spinner / ArrayAdapter. Following is my code: myspinner=(Spinner)findViewById(R.id.myspinner); myadapter=new ArrayAdapter<String>(this,R.layout.mytextview,R.id.mytv,sample_data); myadapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); myspinner.setOnItemSelectedListener(this); myspinner.setAdapter(myadapter); Following is the custom layout mytextview that contains mytv: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns

Android之Adapter用法总结

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1.概念 Adapter是连接后端数据和前端显示的适配器接口，是数据和UI（View）之间一个重要的纽带。在常见的View(ListView,GridView)等地方都需要用到Adapter。如下图直观的表达了Data、Adapter、View三者的关系： Android中所有的Adapter一览：由图可以看到在Android中与Adapter有关的所有接口、类的完整层级图。在我们使用过程中可以根据自己的需求实现接口或者继承类进行一定的扩展。比较常用的有 BaseAdapter，SimpleAdapter，ArrayAdapter，SimpleCursorAdapter等。 BaseAdapter是一个抽象类，继承它需要实现较多的方法，所以也就具有较高的灵活性； ArrayAdapter支持泛型操作，最为简单，只能展示一行字。 SimpleAdapter有最好的扩充性，可以自定义出各种效果。 SimpleCursorAdapter可以适用于简单的纯文字型ListView，它需要Cursor的字段和UI的id对应起来。如需要实现更复杂的UI也可以重写其他方法。可以认为是SimpleAdapter对数据库的简单结合，可以方便地把数据库的内容以列表的形式展示出来。 2.应用案例 1） ArrayAdapter 列表的显示需要三个元素： a．ListVeiw 用来展示列表的View。

How to get the id of the row in onItemClick(ListView) when using a custom Adapter?

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问题 I was searching for a while but i couldn't find the solution. Situation: I'm using a ListView and I have in a Cursor the result of a SQLiteDatabase.query. If I use a SimpleCursorAdapter , when you call onItemClick(AdapterView<?> parent, View view, int position, long id) , the id returned is the _id of the row of the given Cursor but if I use a custom Adapter the return id works like an array [0,1,2,3], how can I set in the custom Adapter this id? Thanks 回答1: Adapter has a method that you can

Is this called adapter? + adapter vs decorator

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问题 I have 2 projects: A and B that should interactwith each other. Project A introduce interface names ISpecialTask and Project B should implement it. Projet B has an entity named TaskWithListOfProperties that cannot implement ISpecialTask because it has different structure of properties (in addition, all the system knows how to work with TaskWithListOfProperties and I don't want to change its structure). So I decided to create a class named SpecialTaskFromListOfProperties that implements