ListView -- BaseAdapter的使用

通过继承实现一个BaseAdapter类，实现上述的ListView。

1.首先设置一个布局文件sim_record.xml,其中只包含了一个ListView组件。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".SimRecord"       android:orientation="vertical">     <ListView           android:id="@+id/mlistview"          android:layout_width="match_parent"          android:layout_height="match_parent"          android:divider="@android:color/holo_blue_light"           android:dividerHeight="1dp"                android:listSelector="@drawable/item_bg"/> </LinearLayout>

 

2.因为每一个item需要显示的是标题和内容。所以初始化俩个List用以存储item的标题和内容。

       List<String> SimInforTitle = new ArrayList<String>();        List<String> SimInforSummary = new ArrayList<String>();

 

首先初始化SimInforTitle，即需要显示列表中的标题：Card ID / Data/ Sim State 等。。

private List<String> initSimInforTitle(List<String> SimInforTitle){  //SimInforTitle     Log.d(TAG," initSimInforTitle()");    SimInforTitle.add(getString(R.string.siminfor_title_cardid));    SimInforTitle.add(getString(R.string.siminfor_title_date));    SimInforTitle.add(getString(R.string.siminfor_title_simstate));    SimInforTitle.add(getString(R.string.siminfor_title_simoperator));    SimInforTitle.add(getString(R.string.siminfor_title_simcountry));    SimInforTitle.add(getString(R.string.siminfor_title_datastate));    SimInforTitle.add(getString(R.string.siminfor_title_networktype));    return SimInforTitle;    }

 

然后初始化SimInforSummary，从card_id从数据库中读取该卡的具体信息，即需要显示列表中的具体内容：

SimInforSummary = mSimRecordResolver.querySimInfor(card_id); 

 

public List<String> querySimInfor(String card_id){String where = "card_id='"+card_id+"'";   // where = '123456'Cursor mCursor = mContentResolver.query(Uri.parse(CONTENT_URI), null, where, null, null);    List<String> SimInforSummart = new ArrayList<String>();if(mCursor.moveToFirst()){//mMap.put("id", Integer.toString(mCursor.getInt(ID)));SimInforSummart.add(mCursor.getString(ID_CARD_ID));SimInforSummart.add(mCursor.getString(ID_DATE));SimInforSummart.add(convertSimState(mCursor.getString(ID_SIM_STATE)));SimInforSummart.add(mCursor.getString(ID_SIM_OPEARTOR));SimInforSummart.add(mCursor.getString(ID_SIM_COUNTRY));SimInforSummart.add(convertDataState(mCursor.getString(ID_DATA_STATE)));SimInforSummart.add(convertNetworkType(mCursor.getString(ID_NETWORK_TYPE)));Log.d(TAG," displayList() id="+Integer.toString(mCursor.getInt(ID)));Log.d(TAG," displayList() cardId="+mCursor.getString(ID_CARD_ID));Log.d(TAG," displayList() ID_DATE=" +mCursor.getString(ID_DATE));Log.d(TAG," displayList() ID_SIM_STATE="+ convertSimState(mCursor.getString(ID_SIM_STATE)));Log.d(TAG," displayList() ID_SIM_OPEARTOR="+ mCursor.getString(ID_SIM_OPEARTOR));Log.d(TAG," displayList() ID_SIM_COUNTRY="+ mCursor.getString(ID_SIM_COUNTRY));Log.d(TAG," displayList() ID_DATA_STATE="+ convertDataState(mCursor.getString(ID_DATA_STATE)));Log.d(TAG," displayList() ID_NETWORK_TYPE="+ convertNetworkType(mCursor.getString(ID_NETWORK_TYPE)));return SimInforSummart;}else{Log.d(TAG," querySimInfor()**where = " +where+ "  .No Sim information");return null;}}

 

3.初始化ArrayList<Map<String,Object>> 类mList。

将每一个map值（即每一个item列表）存储在mList中，而map的值是通过SimInforTitle和SimInforSummary获取。

最后为ListView设置适配器(mBaseAdapter)，即显示出item列表内容。

    public void displaySimInfo(String card_id,List<String> SimInforTitle,List<String> SimInforSummary){    Log.d(TAG," displaySimInfo() ");    ListView mListView = (ListView)findViewById(R.id.mlistview);    List<Map<String,Object>> mList = new ArrayList<Map<String,Object>> ();    mList.clear();    SimInforSummary = mSimRecordResolver.querySimInfor(card_id); //mMapDataBase stored the sim card information        Log.d(TAG," displaySimInfo() -- SimInforSummary.size() = "+SimInforSummary.size());    for(int i=0; i<SimInforSummary.size(); i++){    Map<String,Object> mMap = new HashMap<String,Object>();    mMap.put("title", SimInforTitle.get(i));    mMap.put("summary", SimInforSummary.get(i));    mList.add(mMap);    }    MyBaseAdapter mBaseAdapter = new  MyBaseAdapter(this);    mListView.setAdapter(mBaseAdapter);    }

 

4.继承实现BaseAdapter类

最重要的是覆写BaseAdapter类中的getView()方法。

首先将sim_infor_listview.xml布局文件转换为组件view：convertView =mInflater.inflate(R.layout.sim_infor_listview,null);

然后通过 ArrayList<Map<String,Object>>类mList将每一个item内容给设置上去。

 

 private class MyBaseAdapter extends BaseAdapter{    private LayoutInflater mInflater;    public MyBaseAdapter(Context context) {Log.d(TAG," MyBaseAdapter()");this.mInflater = LayoutInflater.from(context);}@Overridepublic int getCount() {// TODO Auto-generated method stubLog.d(TAG," MyBaseAdapter() -- getCount()=" + mList.size());return  mList.size();}@Overridepublic Object getItem(int arg0) {// TODO Auto-generated method stubLog.d(TAG," MyBaseAdapter() -- getItem()");return null;}@Overridepublic long getItemId(int itemId) {  //return the list item id (0-6)// TODO Auto-generated method stubLog.d(TAG," MyBaseAdapter() -- getItemId()="+itemId);return itemId;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {// TODO Auto-generated method stubLog.d(TAG,"MyBaseAdapter -- getView()  position=" +position + "; convertView = "+ convertView +"; parent=" +parent);ViewHolder mViewHolder =null;if(convertView == null){convertView = mInflater.inflate(R.layout.sim_infor_listview, null);mViewHolder = new ViewHolder();mViewHolder.setTitle((TextView)convertView.findViewById(R.id.text_title));mViewHolder.setSummary((TextView)convertView.findViewById(R.id.text_summary));convertView.setTag(mViewHolder);}else{mViewHolder=(ViewHolder)convertView.getTag();}mViewHolder.title.setText(mList.get(position).get("title").toString());mViewHolder.summary.setText(mList.get(position).get("summary").toString());return convertView;}        }

 

 private  class ViewHolder{      public TextView title;    public TextView summary;public TextView getTitle() {return title;}public void setTitle(TextView title) {this.title = title;}public TextView getSummary() {return summary;}public void setSummary(TextView summary) {this.summary = summary;}    }

sim_info_listview.xml布局文件，即每一个item列表的布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".SimRecord"     android:orientation="vertical">       <TextView        android:id="@+id/text_title"        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1"        android:gravity="left|center"    android:paddingLeft="15dp"        android:ellipsize="end"        android:singleLine="true"        android:textSize="23dp"/>   <TextView        android:id="@+id/text_summary"        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1"        android:gravity="left|center"   android:paddingLeft="15dp"        android:ellipsize="end"        android:singleLine="true"        android:textColor="@color/text_blue"        android:textSize="20dp"/></LinearLayout>