ResourceCursorAdapter

最新推荐文章于 2025-11-26 22:21:13 发布

最新推荐文章于 2025-11-26 22:21:13 发布 · 126 阅读

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本博客介绍ResourceCursorAdapter类的概述、方法及其实现，并通过示例展示其在Android开发中的应用。

publicabstractclass
ResourceCursorAdapter
extendsCursorAdapter
java.lang.Object
android.widget.BaseAdapter
android.widget.CursorAdapter
android.widget.ResourceCursorAdapter
ClassOverview
AneasyadapterthatcreatesviewsdefinedinanXMLfile.
YoucanspecifytheXMLfilethatdefinestheappearanceoftheviews.
ResourceCursorAdapter 是虚类，它继承于 CursorAdapte r，它实现了 CursorAdapter 的 newView 方法

<a rel="nofollow" href="http://developer.android.com/reference/android/widget/ResourceCursorAdapter.html#newView(android.content.Context,%20android.database.Cursor,%20android.view.ViewGroup)" style="color:rgb(0,102,153); line-height:21px; text-decoration:none">newView</a>(<a rel="nofollow" href="http://developer.android.com/reference/android/content/Context.html" style="color:rgb(0,102,153); line-height:21px; text-decoration:none">Context</a>context,<a rel="nofollow" href="http://developer.android.com/reference/android/database/Cursor.html" style="color:rgb(0,102,153); line-height:21px; text-decoration:none">Cursor</a>cursor,<a rel="nofollow" href="http://developer.android.com/reference/android/view/ViewGroup.html" style="color:rgb(0,102,153); line-height:21px; text-decoration:none">ViewGroup</a>parent)

Inflates view(s) from the specified XML file.

用户使用 ResourceCursorAdapter 必须继续它并实现以下函数：

Public Methods
<nobr style="line-height:21px">abstract void</nobr>	<nobr style="line-height:21px"><span style="line-height:21px; margin-right:2px"><a rel="nofollow" href="http://developer.android.com/reference/android/widget/CursorAdapter.html#bindView(android.view.View,%20android.content.Context,%20android.database.Cursor)" style="color:rgb(0,102,153); line-height:21px; text-decoration:none">bindView</a></span>(<a rel="nofollow" href="http://developer.android.com/reference/android/view/View.html" style="color:rgb(0,102,153); line-height:21px; text-decoration:none">View</a>view,<a rel="nofollow" href="http://developer.android.com/reference/android/content/Context.html" style="color:rgb(0,102,153); line-height:21px; text-decoration:none">Context</a>context,<a rel="nofollow" href="http://developer.android.com/reference/android/database/Cursor.html" style="color:rgb(0,102,153); line-height:21px; text-decoration:none">Cursor</a>cursor)</nobr> Bind an existing view to the data pointed to by cursor

关于 ResourceCursorAdapter 的更多内容可以参考《CursorAdapter 》 示例1： importandroid.app.Activity; importandroid.app.ListActivity; importandroid.os.Bundle; importandroid.os.Handler; importandroid.content.Context; importandroid.content.ContentValues; importandroid.database.Cursor; importandroid.view.LayoutInflater; importandroid.view.View; importandroid.widget.ListView; importandroid.view.ViewGroup; importandroid.widget.ArrayAdapter; importandroid.widget.CursorAdapter; importandroid.widget.ResourceCursorAdapter; importandroid.widget.TextView; importandroid.provider.ContactsContract.Contacts; importandroid.provider.ContactsContract.RawContacts; importandroid.view.View.OnClickListener; importandroid.widget.Button; importandroid.util.Log; publicclassHelloCursorextendsListActivity{ privatestaticString[]PROJECTION=newString[]{Contacts._ID, Contacts.DISPLAY_NAME}; /**Calledwhentheactivityisfirstcreated.*/ @Override publicvoidonCreate(BundlesavedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.main); Cursorc=getContentResolver().query(Contacts.CONTENT_URI,PROJECTION, null,null,Contacts.DISPLAY_NAME+"COLLATENOCASE"); startManagingCursor(c); //MyCursorAdapteradapter=newMyCursorAdapter(this,R.layout.list_row,c); MyResourceCursorAdapteradapter=newMyResourceCursorAdapter(this,R.layout.list_row, c); this.setListAdapter(adapter); Buttonbutton=(Button)findViewById(R.id.Button01); OnClickListenerlistener=newOnClickListener(){ @Override publicvoidonClick(Viewv){ cmd=CMD_ADD; doAction(); } }; button.setOnClickListener(listener); Buttonbutton2=(Button)findViewById(R.id.Button02); OnClickListenerlistener2=newOnClickListener(){ @Override publicvoidonClick(Viewv){ cmd=CMD_DELETE_ALL; doAction(); } }; button2.setOnClickListener(listener2); mHandler=newHandler(); } privateString[]mStrings={"hubin","hudashi","robin"}; intcnt=0; privateHandlermHandler; intcmd=0; finalintCMD_ADD=1; finalintCMD_DELETE_ALL=2; classContactThreadimplementsRunnable{ publicvoidrun(){ //HelloCursor.this.getListView().invalidateViews(); if(cmd==CMD_ADD) { addContacts(); } elseif(cmd==CMD_DELETE_ALL) { dealAllContacts(); } cnt++; } } voidaddContacts() { intnStringLength=mStrings.length; intrandomNumber=0; ContentValuesnewValues=newContentValues(); StringtempString=null; randomNumber=(int)(Math.random()%10); for(inti=0;i<nStringLength;i++){ tempString=mStrings+cnt+randomNumber; newValues.put(Contacts.DISPLAY_NAME,tempString); getContentResolver().insert(RawContacts.CONTENT_URI,newValues); newValues.clear(); } Log.i("hubin","add"); } voiddealAllContacts() { getContentResolver().delete(RawContacts.CONTENT_URI,null,null); Log.i("hubin","delete"); } ContactThreadcontactDealer=newContactThread(); voiddoAction() { mHandler.post(contactDealer); } } classMyResourceCursorAdapterextendsResourceCursorAdapter{ publicMyResourceCursorAdapter(Contextcontext,intresource,Cursorcursor){ super(context,resource,cursor); } publicViewnewView(Contextcontext,Cursorcursor,ViewGroupparent){ returnsuper.newView(context,cursor,parent); } @Override publicvoidbindView(Viewview,Contextcontext,Cursorcursor){ Log.i("hubin","bind"+view); TextViewnameView=(TextView)view; //Setthename nameView.setText(cursor .getString(cursor.getColumnIndex("DISPLAY_NAME"))); } } classMyCursorAdapterextendsCursorAdapter{ Contextcontext=null; intviewResId; publicMyCursorAdapter(Contextcontext,intresource,Cursorcursor){ super(context,cursor); viewResId=resource; } publicViewnewView(Contextcontext,Cursorcursor,ViewGroupparent){ TextViewview=null; LayoutInflatervi=null; vi=(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); view=(TextView)vi.inflate(viewResId,parent,false); //v=(TextView)vi.inflate(textViewResourceId,null); Log.i("hubin","newView"+view); returnview; } @Override publicvoidbindView(Viewview,Contextcontext,Cursorcursor){ Log.i("hubin","bind"+view); TextViewnameView=(TextView)view; //Setthename nameView.setText(cursor .getString(cursor.getColumnIndex("DISPLAY_NAME"))); } }