Android ListActivity总结

这两天在做一个短信群发器，在用ListActivity和CursorAdapter罗列联系人并记录用户输入时遇到了一些麻烦，解决过程颇为繁琐，深深感到Android API之广、杂的同时也让自己能静下心来谨慎编码仔细调试广泛查阅，现将最终成果和各种问题以及相应解决方法一一罗列，作为这两日的工作总结的同时，希望能给各位带来一些帮助。

先说明下这个模块要实现的功能吧，此模块主要为群发短信的地址输入模块，用户可以在EditText中直接输入地址，也可以从联系人中pick多个电话号码。

遇到的主要问题有：1.为了实现两种输入方式（直接EditText输入和联系人选择输入），创建了一个从联系人选择电话号码的ListActivity，为了能在地址编辑Activity和ListActivity之间切换而不丢失已经编辑了的电话号码，就得创建一种数据结构来保存这些电话号码，我这里使用的是一个LinkedList（具体结构后面再阐述），但是怎么样才能保证每次切换都能正确保存地址数据而且EditText内容与地址数据结构保持一致呢？！解决方法是在每次Activity切换时都先进行一次解析或提取过程：从EditText切换到ListActivity之前读取EditText 的字符串内容并分析获得地址数据保存到LinkedList中，从ListActivity切换到Activity之前解析LinkedList 内容获取要在EditText中显示的字符串内容。

2.有些联系人的号码不止一个，那么应该如何对待？这里我选择的方式和我的Android 2.3系统自带的短信发送器不一样，系统自带的在从联系人获取号码时，如果联系人的号码多于1个，会弹出一个对话框让用户选择一个号码，而我选择的时对话框让用户选择多个号码。

3.对话框与主Activity之间的通信问题，如何让对话框保存用户选择给Activity使用？这里我的解决方式是用静态变量和final变量，从内部类中调用这些变量。

4.用户从对话框选择号码后，如何更新ListActivity的显示内容？我的解决方法是用Handler，对话框给Handler发送消息，Handler使ListActivity更新界面，更新方法为调用Cursor的requery方法。

还有几个比较小的问题，比如联系人数据库的内容，ListActivity中CheckBox的绘制等，就不一一列举了。

现附上我的代码（代码上还有很多清晰的改动以及调试痕迹，呵呵）：a.短信编辑Activity/** this Activity is created for sending message* users would edit sms message body in the EditText message , and destinations in the EditText receivers* there can be more than one destinations , and they are arranged at a strict layout* the phone number of every destination would be a String of digits , and they are separated by ','* and the spaces in the string are all ignored* a valid destinations description is like this : 1234 ,1254,1 3 52,6528,**/package com.tobacco.activity;import java.util.ArrayList;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import com.tobacco.pro.R;import com.tobacco.sms.SMSSender;public class EditMessAct extends Activity implements OnClickListener{private Button findContacts;private Button send;private EditText receivers;private EditText message;private ArrayList<String> dest;private static final char SEPARATE=',';@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(yout.editmessage);init();}private void init(){findContacts=(Button)findViewById(R.id.contacts);send=(Button)findViewById(R.id.send);receivers=(EditText)findViewById(R.id.receivers);message=(EditText)findViewById(R.id.messagetext);findContacts.setOnClickListener(this);send.setOnClickListener(this);dest=new ArrayList<String>();}@Overridepublic void onClick(View v) {// TODO Auto-generated method stubIntent i;if(v==findContacts){refreshDest();i=new Intent(this,ListContactAct.class);this.startActivityForResult(i,1);}else if(v==send){refreshDest();String t=message.getText().toString();new SMSSender(t,dest).send();}}@Overrideprotected void onActivityResult(int request,int result,Intent intent){ super.onActivityResult(request,result,intent);int t=ListContactAct.selectedReceiver.size();int i=0;int k=0;int p,j;boolean mark;//String str="";for(i=0;i<t;i++){//str=str+ListContactAct.selectedReceiver.get(i).phoneNumber+";";p=ListContactAct.selectedReceiver.get(i).phoneNumber.size();for(k=0;k<p;k++){mark=true;for(j=0;j<dest.size();j++){if(ListContactAct.selectedReceiver.get(i).phoneNumber.get(k).equals(dest.get(j))){mark=false;}}if(mark){dest.add(ListContactAct.selectedReceiver.get(i).phoneNumber.get(k));}}}refreshText();//receivers.setText(str+receivers.getText().toString());}//refresh the EditText receivers by the ArrayList destprivate void refreshText(){String t="";int k=dest.size();int i;for(i=0;i<k;i++){t+=dest.get(i);t+=SEPARATE;}receivers.setText(t);}//refresh the ArrayList dest by the EditText receivers and return information of the analyze result private int refreshDest(){ArrayList<String> tempDest=new ArrayList<String>();String f=receivers.getText().toString();int k=f.length();String number="";for(int i=0;i<k;i++){if(f.charAt(i)==SEPARATE){if(number.length()>0){boolean tempMark=true;for(int m=0;m<tempDest.size();m++){if(tempDest.get(m).equals(number)){tempMark=false;break;}}if(tempMark){tempDest.add(number);}}number="";}else if(f.charAt(i)>='0'&&f.charAt(i)<='9'){number+=f.charAt(i);}}if(number.length()>0){boolean tempMark=true;for(int m=0;m<tempDest.size();m++){if(tempDest.get(m).equals(number)){tempMark=false;break;}}if(tempMark){tempDest.add(number);}}dest=tempDest;return 0;}}从联系人pick号码的ListActivity：package com.tobacco.activity;//import java.util.ArrayList;import java.util.ArrayList;import java.util.LinkedList;import android.app.AlertDialog;import android.app.ListActivity;import android.content.DialogInterface;import android.content.Intent;import android.database.Cursor;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.provider.ContactsContract;import android.provider.Contacts.People.Phones;import android.util.Log;import android.view.View;import android.widget.CheckBox;import android.widget.ListView;import com.tobacco.adapter.ListContactsAdapter;import com.tobacco.pro.R;import com.tobacco.types.Receiver;@SuppressWarnings("deprecation")public class ListContactAct extends ListActivity{private Cursor cursor;public static LinkedList<Receiver> selectedReceiver;public static LinkedList<Integer> selectedPos;private int idColumn;private int displayNameColumn;public static Handler hand;//private Cursor phones=null;//private ArrayList<String> pNumber;@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);//pNumber=new ArrayList<String>();selectedReceiver =new LinkedList<Receiver>();selectedPos=new LinkedList<Integer>();//cursor=getContentResolver().query(People.CONTENT_URI,null,null,null,null);//the cursor get by the above command has no column of has_phone_number cursor= managedQuery(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);debugColumnInfo();startManagingCursor(cursor);idColumn=cursor.getColumnIndex(ContactsContract.Contacts._ID);displayNameColumn=cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME);ListContactsAdapter adapter = new ListContactsAdapter(this,yout.listcontact,cursor,new String[] {Phones.DISPLAY_NAME},new int[] {R.id.people});this.setListAdapter(adapter);hand=new Handler(){@Overridepublic void handleMessage(Message msg){Bundle bundle=msg.getData();int pos=bundle.getInt("position");if(pos!=-1){cursor.requery();}}};}@Overrideprotected void onPause(){super.onPause();Intent intent=new Intent();intent.putExtra("date",1);setResult(1,intent);finish();}@Overrideprotected void onListItemClick (ListView l, View v, int position, long id){//Toast.makeText(this,""+position+"+"+id,Toast.LENGTH_SHORT).show();CheckBox cbx = (CheckBox) v.findViewById(R.id.check);String contactId=null;String displayName=null;int hasPhone;final int phoneCount;int t=0;int q=0;int i;cursor.moveToPosition(position);contactId=cursor.getString(idColumn);displayName = cursor.getString(displayNameColumn);while(q<selectedReceiver.size()&&!selectedReceiver.get(q).id.equals(contactId)){q++;}Integer intg=new Integer(position);while(t<selectedPos.size()&&!selectedPos.get(t).equals(intg)){t++;}if(t<selectedPos.size()){if(cbx.isChecked()){cbx.setChecked(false);}selectedReceiver.remove(q);selectedPos.remove(t);//the people has been added to the send list already/*phoneCount=cursor.getInt(cursor.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NU MBER));if(phoneCount>1){a}*/}else{//the people has not been added to the send list yethasPhone=Integer.parseInt(cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.HAS_ PHONE_NUMBER)));//note:the variable hasPhone ,as the number stored in columnhas_phone_number is not represent the count of//phone numbers the people has,but the mark that if the people has at least one phone number ,1 has or 0 not//Toast.makeText(this,"phoneCount:"+phoneCount,Toast.LENGTH_SHORT).show();if(hasPhone>0){final Cursor phones = getContentResolver().query(monDataKinds.Phone.CONTENT_URI,null,monDataKinds.Phone.CONTACT_ID+ " = " + contactId, null, null);//Toast.makeText(this,"phoneCount22:"+phones.getCount(),Toast.LENGTH_SHORT).show();phoneCount=phones.getCount();final String[] pNums=new String[phoneCount];//pNumber=new ArrayList<String>();if (phones.moveToFirst()){i=0;do{//pNumber.add(phones.getString(phones.getColumnIndex(monDataKinds.Pho ne.NUMBER)));//pNumber is a ArrayList instance to record the phone numbers of the people that was clickedpNums[i]=phones.getString(phones.getColumnIndex(monDataKinds.Phone.N UMBER));i++;}while (i<phoneCount&&phones.moveToNext());}//Toast.makeText(this,""+pNumber.get(0),Toast.LENGTH_SHORT).show();if(phoneCount==1){if(!cbx.isChecked()){cbx.setChecked(true);}selectedReceiver.add(newReceiver(contactId,displayName,pNums[0]));Integer in=new Integer(position);selectedPos.add(in);}else if(phoneCount>1){final boolean[] mark=new boolean[phoneCount];final String name=displayName;final int p=position;final String conId=contactId;for(int w=0;w<phoneCount;w++){mark[w]=false;}AlertDialog ad=new AlertDialog.Builder(this).setTitle("select phone number").setMultiChoiceItems(pNums,mark,new DialogInterface.OnMultiChoiceClickListener(){public void onClick(DialogInterface dialog,int which,boolean isChecked){}}).setPositiveButton("okay",new DialogInterface.OnClickListener(){public void onClick(DialogInterface dialog,int which){ArrayList<String> a=new ArrayList<String>();for(intu=0;u<mark.length;u++){if(mark[u]){a.add(pNums[u]);}}ListContactAct.selectedReceiver.add(new Receiver(conId,name,a));Integer in=newInteger(p);ListContactAct.selectedPos.add(in);Bundle bundle=new Bundle();bundle.putInt("position",p);Messagemsg=Message.obtain();msg.setData(bundle);ListContactAct.hand.sendMessage(msg);}}).setNegativeButton("cancel",null).create();ad.show();}}}super.onListItemClick(l, v, position, id);}private void debugColumnInfo(){int count=cursor.getColumnCount();int t=0;String tag="DebugColumn";for(;t<count;t++){Log.d(tag,cursor.getColumnName(t));}}}自定义Adapter：package com.tobacco.adapter;import com.tobacco.activity.ListContactAct;import com.tobacco.pro.R;import android.content.Context;import android.database.Cursor;import android.view.View;import android.view.ViewGroup;import android.widget.CheckBox;import android.widget.SimpleCursorAdapter;public class ListContactsAdapter extends SimpleCursorAdapter{public ListContactsAdapter(Context context, int layout, Cursor c,String[] from, int[] to) {super(context, layout, c, from, to);}@Overridepublic View getView(int position, View convertView, ViewGroup parent){View rowView=super.getView(position,convertView,parent);int t=0;Integer in=new Integer(position);while(ListContactAct.selectedPos.size()>t&&!ListContactAct.selectedPos.get(t).equals(in)){t++;}CheckBox cbx=(CheckBox)(rowView.findViewById(R.id.check));if(t<ListContactAct.selectedPos.size()){cbx.setChecked(true);}else{cbx.setChecked(false);}return rowView;}}。