CSipSimple是运行在android设备上的一个开源的sip协议应用程序，本文其中的拨打电话机制进行大致分析。

项目中，拨打电话利用了AIDL方法来实现。aidl是 Android Interface definition language的缩写，它是一种android内部进程通信接口的描述语言，通过它来定义进程间的通信接口，完成IPC（Inter-Process Communication，进程间通信）。

创建.aidl文件

ISipService.aidl内容如下：

/**
 * Copyright (C) 2010-2012 Regis Montoya (aka r3gis - www.r3gis.fr)
 * This file is part of CSipSimple.
 *
 *  CSipSimple is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *  If you own a pjsip commercial license you can also redistribute it
 *  and/or modify it under the terms of the GNU Lesser General Public License
 *  as an android library.
 *
 *  CSipSimple is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with CSipSimple.  If not, see <http://www.gnu.org/licenses/>.
 *  
 *  This file and this file only is also released under Apache license as an API file
 */
package com.csipsimple.api;
import com.csipsimple.api.SipProfileState;
import com.csipsimple.api.SipCallSession;
import com.csipsimple.api.MediaState;

interface ISipService{
	/**
	* Get the current API version
	* @return version number. 1000 x major version + minor version
	* Each major version must be compatible with all versions of the same major version
	*/

.........
void makeCallWithOptions(in String callee, int accountId, in Bundle options);
}

自动编译生成java文件

eclipse中的ADT插件会自动在aidl文件中声明的包名目录下生成java文件，如下图所示：

 package com.csipsimple.api;
 public interface ISipService extends android.os.IInterface
 {
 ……
 //Place a call
 
public void makeCallWithOptions(java.lang.String callee, int accountId, android.os.Bundle options) throws android.os.RemoteException;
 }

void com.csipsimple.api.ISipService.makeCallWithOptions(String msg, String toNumber, long accountId)

结合代码一层层看调用

目录：src\com\csipsimple\ui\dialpad

DialerFragment.java

    private ISipService service;
    private ServiceConnection connection = new ServiceConnection() {

        @Override
        public void onServiceConnected(ComponentName arg0, IBinder arg1) {
            service = ISipService.Stub.asInterface(arg1);
         ........
        }

        @Override
        public void onServiceDisconnected(ComponentName arg0) {
            service = null;
        }
    };

   @Override
    public void placeCall() {
        placeCallWithOption(null);
    }

private void placeCallWithOption(Bundle b) {
        if (service == null) {
            return;
        }
        String toCall = "";
        Long accountToUse = SipProfile.INVALID_ID;
        // Find account to use
        SipProfile acc = accountChooserButton.getSelectedAccount();
        if (acc != null) {
            accountToUse = acc.id;
        }
        // Find number to dial
        if(isDigit) {
            toCall = PhoneNumberUtils.stripSeparators(digits.getText().toString());
        }else {
            toCall = digits.getText().toString();
        }
        
        if (TextUtils.isEmpty(toCall)) {
            return;
        }

        // Well we have now the fields, clear theses fields
        digits.getText().clear();

        // -- MAKE THE CALL --//
        if (accountToUse >= 0) {
            // It is a SIP account, try to call service for that
            try {
                service.makeCallWithOptions(toCall, accountToUse.intValue(), b);
            } catch (RemoteException e) {
                Log.e(THIS_FILE, "Service can't be called to make the call");
            }
        } else if (accountToUse != SipProfile.INVALID_ID) {
            // It's an external account, find correct external account
            CallHandlerPlugin ch = new CallHandlerPlugin(getActivity());
            ch.loadFrom(accountToUse, toCall, new OnLoadListener() {
                @Override
                public void onLoad(CallHandlerPlugin ch) {
                    placePluginCall(ch);
                }
            });
        }
    }
    

2.服务端
SipService.java
/**
  * 继承 Service发布服务
  */
 public class SipService extends Service {
     ...
 
     // 为服务实现公共接口， Stub类继承了Binder
     private final ISipService.Stub binder = new ISipService.Stub() {
        ...
       @Override
        public void makeCallWithOptions(final String callee, final int accountId, final Bundle options)
                throws RemoteException {
            SipService.this.enforceCallingOrSelfPermission(SipManager.PERMISSION_USE_SIP, null);
            //We have to ensure service is properly started and not just binded
            SipService.this.startService(new Intent(SipService.this, SipService.class));
            
            if(pjService == null) {
                Log.e(THIS_FILE, "Can't place call if service not started");
                // TODO - we should return a failing status here
                return;
            }
            
            if(!supportMultipleCalls) {
                // Check if there is no ongoing calls if so drop this request by alerting user
                SipCallSession activeCall = pjService.getActiveCallInProgress();
                if(activeCall != null) {
                    if(!CustomDistribution.forceNoMultipleCalls()) {
                        notifyUserOfMessage(R.string.not_configured_multiple_calls);
                    }
                    return;
                }
            }
            getExecutor().execute(new SipRunnable() {
                @Override
                protected void doRun() throws SameThreadException {
                    pjService.makeCall(callee, accountId, options);
                }
            });
        }
		

service.makeCallWithOptions(toCall, accountToUse.intValue(), b);调用接口中的方法，完成IPC方法。

public int makeCall(String callee, int accountId, Bundle b) throws SameThreadException {
        if (!created) {
            return -1;
        }

        final ToCall toCall = sanitizeSipUri(callee, accountId);
        if (toCall != null) {
            pj_str_t uri = pjsua.pj_str_copy(toCall.getCallee());

            // Nothing to do with this values
            byte[] userData = new byte[1];
            int[] callId = new int[1];
            pjsua_call_setting cs = new pjsua_call_setting();
            pjsua_msg_data msgData = new pjsua_msg_data();
            int pjsuaAccId = toCall.getPjsipAccountId();
            
            // Call settings to add video
            pjsua.call_setting_default(cs);
            cs.setAud_cnt(1);
            cs.setVid_cnt(0);
            if(b != null && b.getBoolean(SipCallSession.OPT_CALL_VIDEO, false)) {
                cs.setVid_cnt(1);
            }
            cs.setFlag(0);
            
            pj_pool_t pool = pjsua.pool_create("call_tmp", 512, 512);
            
            // Msg data to add headers
            pjsua.msg_data_init(msgData);
            pjsua.csipsimple_init_acc_msg_data(pool, pjsuaAccId, msgData);
            if(b != null) {
                Bundle extraHeaders = b.getBundle(SipCallSession.OPT_CALL_EXTRA_HEADERS);
                if(extraHeaders != null) {
                    for(String key : extraHeaders.keySet()) {
                        try {
                            String value = extraHeaders.getString(key);
                            if(!TextUtils.isEmpty(value)) {
                                int res = pjsua.csipsimple_msg_data_add_string_hdr(pool, msgData, pjsua.pj_str_copy(key), pjsua.pj_str_copy(value));
                                if(res == pjsuaConstants.PJ_SUCCESS) {
                                    Log.e(THIS_FILE, "Failed to add Xtra hdr (" + key + " : " + value + ") probably not X- header");
                                }
                            }
                        }catch(Exception e) {
                            Log.e(THIS_FILE, "Invalid header value for key : " + key);
                        }
                    }
                }
            }
            
            int status = pjsua.call_make_call(pjsuaAccId, uri, cs, userData, msgData, callId);
            if(status == pjsuaConstants.PJ_SUCCESS) {
                dtmfToAutoSend.put(callId[0], toCall.getDtmf());
                Log.d(THIS_FILE, "DTMF - Store for " + callId[0] + " - "+toCall.getDtmf());
            }
            pjsua.pj_pool_release(pool);
            return status;
        } else {
            service.notifyUserOfMessage(service.getString(R.string.invalid_sip_uri) + " : "
                    + callee);
        }
        return -1;
    }

package org.pjsip.pjsua;

public class pjsua implements pjsuaConstants {
public synchronized static int call_make_call(int acc_id, pj_str_t dst_uri, pjsua_call_setting opt, byte[] user_data, pjsua_msg_data msg_data, int[] p_call_id) {
    return pjsuaJNI.call_make_call(acc_id, pj_str_t.getCPtr(dst_uri), dst_uri, pjsua_call_setting.getCPtr(opt), opt, user_data, pjsua_msg_data.getCPtr(msg_data), msg_data, p_call_id);
  }
..........
}

PJ_DEF(pj_status_t) pjsua_call_make_call(pjsua_acc_id acc_id,
					 const pj_str_t *dest_uri,
					 const pjsua_call_setting *opt,
					 void *user_data,
					 const pjsua_msg_data *msg_data,
					 pjsua_call_id *p_call_id)
{
    pj_pool_t *tmp_pool = NULL;
    pjsip_dialog *dlg = NULL;
    pjsua_acc *acc;
    pjsua_call *call;
    int call_id = -1;
    pj_str_t contact;
    pj_status_t status;


    /* Check that account is valid */
    PJ_ASSERT_RETURN(acc_id>=0 || acc_id<(int)PJ_ARRAY_SIZE(pjsua_var.acc), 
		     PJ_EINVAL);

    /* Check arguments */
    PJ_ASSERT_RETURN(dest_uri, PJ_EINVAL);

    PJ_LOG(4,(THIS_FILE, "Making call with acc #%d to %.*s", acc_id,
	      (int)dest_uri->slen, dest_uri->ptr));

    pj_log_push_indent();

    PJSUA_LOCK();

    /* Create sound port if none is instantiated, to check if sound device
     * can be used. But only do this with the conference bridge, as with 
     * audio switchboard (i.e. APS-Direct), we can only open the sound 
     * device once the correct format has been known
     */
    if (!pjsua_var.is_mswitch && pjsua_var.snd_port==NULL && 
	pjsua_var.null_snd==NULL && !pjsua_var.no_snd) 
    {
	status = pjsua_set_snd_dev(pjsua_var.cap_dev, pjsua_var.play_dev);
	if (status != PJ_SUCCESS)
	    goto on_error;
    }

    acc = &pjsua_var.acc[acc_id];
    if (!acc->valid) {
	pjsua_perror(THIS_FILE, "Unable to make call because account "
		     "is not valid", PJ_EINVALIDOP);
	status = PJ_EINVALIDOP;
	goto on_error;
    }

    /* Find free call slot. */
    call_id = alloc_call_id();

    if (call_id == PJSUA_INVALID_ID) {
	pjsua_perror(THIS_FILE, "Error making call", PJ_ETOOMANY);
	status = PJ_ETOOMANY;
	goto on_error;
    }

    call = &pjsua_var.calls[call_id];

    /* Associate session with account */
    call->acc_id = acc_id;
    call->call_hold_type = acc->cfg.call_hold_type;

    /* Apply call setting */
    status = apply_call_setting(call, opt, NULL);
    if (status != PJ_SUCCESS) {
	pjsua_perror(THIS_FILE, "Failed to apply call setting", status);
	goto on_error;
    }

    /* Create temporary pool */
    tmp_pool = pjsua_pool_create("tmpcall10", 512, 256);

    /* Verify that destination URI is valid before calling 
     * pjsua_acc_create_uac_contact, or otherwise there  
     * a misleading "Invalid Contact URI" error will be printed
     * when pjsua_acc_create_uac_contact() fails.
     */
    if (1) {
	pjsip_uri *uri;
	pj_str_t dup;

	pj_strdup_with_null(tmp_pool, &dup, dest_uri);
	uri = pjsip_parse_uri(tmp_pool, dup.ptr, dup.slen, 0);

	if (uri == NULL) {
	    pjsua_perror(THIS_FILE, "Unable to make call", 
			 PJSIP_EINVALIDREQURI);
	    status = PJSIP_EINVALIDREQURI;
	    goto on_error;
	}
    }

    /* Mark call start time. */
    pj_gettimeofday(&call->start_time);

    /* Reset first response time */
    call->res_time.sec = 0;

    /* Create suitable Contact header unless a Contact header has been
     * set in the account.
     */
    if (acc->contact.slen) {
	contact = acc->contact;
    } else {
	status = pjsua_acc_create_uac_contact(tmp_pool, &contact,
					      acc_id, dest_uri);
	if (status != PJ_SUCCESS) {
	    pjsua_perror(THIS_FILE, "Unable to generate Contact header", 
			 status);
	    goto on_error;
	}
    }

    /* Create outgoing dialog: */
    status = pjsip_dlg_create_uac( pjsip_ua_instance(), 
				   &acc->cfg.id, &contact,
				   dest_uri, dest_uri, &dlg);
    if (status != PJ_SUCCESS) {
	pjsua_perror(THIS_FILE, "Dialog creation failed", status);
	goto on_error;
    }

    /* Increment the dialog's lock otherwise when invite session creation
     * fails the dialog will be destroyed prematurely.
     	*/
    pjsip_dlg_inc_lock(dlg);

    if (acc->cfg.allow_via_rewrite && acc->via_addr.host.slen > 0)
        pjsip_dlg_set_via_sent_by(dlg, &acc->via_addr, acc->via_tp);

    /* Calculate call's secure level */
    call->secure_level = get_secure_level(acc_id, dest_uri);

    /* Attach user data */
    call->user_data = user_data;
    
    /* Store variables required for the callback after the async
     * media transport creation is completed.
     */
    if (msg_data) {
	call->async_call.call_var.out_call.msg_data = pjsua_msg_data_clone(
                                                          dlg->pool, msg_data);
    }
    call->async_call.dlg = dlg;

    /* Temporarily increment dialog session. Without this, dialog will be
     * prematurely destroyed if dec_lock() is called on the dialog before
     * the invite session is created.
     */
    pjsip_dlg_inc_session(dlg, &pjsua_var.mod);

    /* Init media channel */
    status = pjsua_media_channel_init(call->index, PJSIP_ROLE_UAC, 
				      call->secure_level, dlg->pool,
				      NULL, NULL, PJ_TRUE,
                                      &on_make_call_med_tp_complete);
    if (status == PJ_SUCCESS) {
        status = on_make_call_med_tp_complete(call->index, NULL);
        if (status != PJ_SUCCESS)
	    goto on_error;
    } else if (status != PJ_EPENDING) {
	pjsua_perror(THIS_FILE, "Error initializing media channel", status);
        pjsip_dlg_dec_session(dlg, &pjsua_var.mod);
	goto on_error;
    }

    /* Done. */

    if (p_call_id)
	*p_call_id = call_id;

    pjsip_dlg_dec_lock(dlg);
    pj_pool_release(tmp_pool);
    PJSUA_UNLOCK();

    pj_log_pop_indent();

    return PJ_SUCCESS;


on_error:
    if (dlg) {
	/* This may destroy the dialog */
	pjsip_dlg_dec_lock(dlg);
    }

    if (call_id != -1) {
	reset_call(call_id);
	pjsua_media_channel_deinit(call_id);
    }

    if (tmp_pool)
	pj_pool_release(tmp_pool);
    PJSUA_UNLOCK();

    pj_log_pop_indent();
    return status;
}

通过本文的研究分析，我们了解到CSipSimple通过aidl方法实现进程间通信，从而实现了拨打电话功能。

原问题来自于CSDN问答频道，更多见：http://ask.csdn.net/questions/1679

问题描述：

我使用 arrayadapter 来 filter 一个 listview。Arraydapter 的参数是一个String[][]。但是没有成功，必须要重写 Filter interface吗？要是这样的话，如何重写呢？
filter 数组的每一个位置：

galleryValues[0][0] -> "tiulo" [0][1] -> "desc" [0][2] -> "etc"
lstContinente = (ListView)findViewById(R.id.list);
lstContinente.setTextFilterEnabled(true);
adapter = new PortaitArrayAdapter(cx,galleryValues);   
lstContinente.setAdapter(adapter);

ed_busqueda.addTextChangedListener(new TextWatcher() {           
    public void afterTextChanged(Editable s) {}      
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    // TODO Auto-generated method stub       
}        
public void onTextChanged(CharSequence s, int start, int before, int count) {
    adapter.getFilter().filter(s.toString());
    adapter.notifyDataSetChanged();                 
}        
});

The adapter code:

public class PortaitArrayAdapter extends ArrayAdapter<String> {
    private final Context context;
    private final String[][] values;
    private List<Imagen> imagenes = null;
    private LayoutInflater mInflater;
    public ImageLoader imageLoader;     
    public PortaitArrayAdapter(Context context, String[][] values) {
        super(context, R.layout.gallery_row);
        this.context = context;
        this.values = values;
        mInflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        imagenes = new ArrayList<Imagen>();
        for (int i = 0; i < 20; i++) imagenes.add(new Imagen());
        Bitmap def = BitmapFactory.decodeResource(this.context.getResources(),R.drawable.ic_launcher);
        imageLoader=new ImageLoader(this.context,def, imagenes);
    }
    @Override
    public int getCount (){
        return this.values.length;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null) {
            holder = new ViewHolder();
        convertView =  mInflater.inflate(R.layout.gallery_row, parent, false);
            holder.txtTitulo = (TextView) convertView.findViewById(R.id.txt_gallery_titulo);
            holder.txtDesc = (TextView) convertView.findViewById(R.id.txt_gallery_desc);
            holder.txtFecha = (TextView) convertView.findViewById(R.id.txt_gallery_fecha);
            holder.txtEst = (TextView) convertView.findViewById(R.id.txt_gallery_est);
            holder.imageView    = (ImageView)convertView.findViewById(R.id.lst_img_gallery);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
       /*LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View rowView = inflater.inflate(R.layout.gallery_row, parent, false);*/

        //ImageView imageView = (ImageView) rowView.findViewById(R.id.icon);
        Bitmap bmp;
        Log.v("Position --> ",String.valueOf(position));
        try {
            byte b[] = imagenes.get(position).getImageData();
            if (b != null) {
                bmp = BitmapFactory.decodeByteArray(b, 0, b.length);
                if (bmp != null) holder.imageView.setImageBitmap(bmp);
            } else {
         String urlBase = galleryValues[position][0].substring(0, galleryValues[position][0].lastIndexOf("/")+1);
               String urlToEncode = galleryValues[position][0].substring(galleryValues[position][0].lastIndexOf("/")+1, galleryValues[position][0].length());
         urlToEncode = URLEncoder.encode(urlToEncode,"UTF-8");
         String url = urlBase.concat(urlToEncode);
         url = url.replace("+", "%20");
               Log.v("UrlFinal --> ",url);
imageLoader.DisplayImage(String.valueOf(position),url,act,holder.imageView, position,null);
            }
            } catch (Exception e) {
            Log.e(this.getClass().getName(),"Exception en pos = " + position + " error:" + e.getMessage());
            e.printStackTrace();
        }
       holder.txtTitulo.setText(galleryValues[position][1] + ", " + galleryValues[position][2]);
        String[] dates = galleryValues[position][4].split("/");  
        String date = dates [1] + "/" + dates[0] + "/" + dates[2];
        Date d1 = new Date(date);
        DateFormat df = DateFormat.getDateInstance(DateFormat.LONG);
        holder.txtDesc.setText(galleryValues[position][3]);
        holder.txtFecha.setText(df.format(d1));
        holder.txtEst.setText(getText(R.string.num_fotos_gallery) + galleryValues[position][5] + " - " + getText(R.string.num_videos_gallery) + galleryValues[position][6] + " - " + getText(R.string.num_exp_gallery) + galleryValues[position][7]);
        return convertView;
    }
   }
private static class ViewHolder {
    TextView txtTitulo;
    TextView txtDesc;
    TextView txtFecha;
    TextView txtEst;
    ImageView imageView;
}

：

把字符串数组放在 ArrayList 中，然后把它传递到 Adapter。使用下面的代码或者用 String[]更改下面的代码。
需要在 Adapter 类中实现 Filterable ，重写 getFilter()。
参考下面的代码关于 Filtering custom Adapter.

public class ListFilterActivity extends ListActivity {

            private List<String> list = new ArrayList<String>();
            List<String> mOriginalValues;

            @Override
            public void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.main);

                final MyAdapter adapter = new MyAdapter(this, getModel());
                setListAdapter(adapter);

                EditText filterEditText = (EditText) findViewById(R.id.filterText);

                // Add Text Change Listener to EditText
                filterEditText.addTextChangedListener(new TextWatcher() {

                    @Override
                    public void onTextChanged(CharSequence s, int start, int before, int count) {
                        // Call back the Adapter with current character to Filter
                        adapter.getFilter().filter(s.toString());
                    }

                    @Override
                    public void beforeTextChanged(CharSequence s, int start, int count,int after) {
                    }

                    @Override
                    public void afterTextChanged(Editable s) {
                    }
                });
            }

            private List<String> getModel() {
                list.add("Linux");
                list.add("Windows7");
                list.add("Suse");
                list.add("Eclipse");
                list.add("Ubuntu");
                list.add("Solaris");
                list.add("Android");
                list.add("iPhone");
                list.add("Windows XP");
                return list;
            }

// Adapter Class            
public class MyAdapter extends BaseAdapter implements Filterable {

            List<String> arrayList;      
            List<String> mOriginalValues; // Original Values
            LayoutInflater inflater;

            public MyAdapter(Context context, List<String> arrayList) {
                this.arrayList = arrayList;
                inflater = LayoutInflater.from(context);
            }

            @Override
            public int getCount() {
                return arrayList.size();
            }

            @Override
            public Object getItem(int position) {
                return position;
            }

            @Override
            public long getItemId(int position) {
                return position;
            }

            private class ViewHolder {
                TextView textView;
            }

            @Override
            public View getView(int position, View convertView, ViewGroup parent) {

                ViewHolder holder = null;

                if (convertView == null) {

                    holder = new ViewHolder();
                    convertView = inflater.inflate(R.layout.row, null);
                    holder.textView = (TextView) convertView
                            .findViewById(R.id.textview);
                    convertView.setTag(holder);
                } else {
                    holder = (ViewHolder) convertView.getTag();
                }
                holder.textView.setText(arrayList.get(position));
                return convertView;
            }

            @Override
            public Filter getFilter() {
                Filter filter = new Filter() {

                    @SuppressWarnings("unchecked")
                    @Override
                    protected void publishResults(CharSequence constraint,FilterResults results) {

                        arrayList = (List<String>) results.values; // has the filtered values
                        notifyDataSetChanged();  // notifies the data with new filtered values
                    }

                    @Override
                    protected FilterResults performFiltering(CharSequence constraint) {
                        FilterResults results = new FilterResults();        // Holds the results of a filtering operation in values
                        List<String> FilteredArrList = new ArrayList<String>();

                        if (mOriginalValues == null) {
                            mOriginalValues = new ArrayList<String>(arrayList); // saves the original data in mOriginalValues
                        }

                        /********
                         * 
                         *  If constraint(CharSequence that is received) is null returns the mOriginalValues(Original) values
                         *  else does the Filtering and returns FilteredArrList(Filtered)  
                         *
                         ********/
                        if (constraint == null || constraint.length() == 0) {

                            // set the Original result to return  
                            results.count = mOriginalValues.size();
                            results.values = mOriginalValues;
                        } else {
                            constraint = constraint.toString().toLowerCase();
                            for (int i = 0; i < mOriginalValues.size(); i++) {
                                String data = mOriginalValues.get(i);
                                if (data.toLowerCase().startsWith(constraint.toString())) {
                                    FilteredArrList.add(data);
                                }
                            }
                            // set the Filtered result to return
                            results.count = FilteredArrList.size();
                            results.values = FilteredArrList;
                        }
                        return results;
                    }
                };
                return filter;
            }
        }
    }

创建Contentprovider:

1. 创建一个provider----ExampleContentProvider

• 设计Content URIs( a. 设计authority b. 设计path c.处理content URI IDs d.Content URI patterns
  )
•  实现Provider中必须的方法( query()insert()update()delete()getType()onCreate() )
• 定义MIME Types（ getType()One of the required methods that you must implement for any provider. getStreamTypes()A method that you're expected to implement if your provider offers files.）

package com.hualu.contentprovider;

import java.util.HashMap;
import java.util.Map;

import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteQueryBuilder;
import android.net.Uri;
import android.text.TextUtils;

public class ExampleContentProvider extends ContentProvider {

	/*
     * Defines a handle to the database helper object. The MainDatabaseHelper class is defined
     * in a following snippet.
     */
    private MainDatabaseHelper mOpenHelper;

    // Defines the database name
    private static final String DBNAME = "mydb";
    
    
    private static final int MAINS = 1 ;
    private static final int MAIN_ID = 2 ;

    /**
     * A UriMatcher instance
     */
    private static final UriMatcher sUriMatcher;
    
    private static Map<String, String > columnMap = new HashMap<String, String>() ;
    static{
    	 // Create a new instance
        sUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
        sUriMatcher.addURI(Main.AUTHORITY, "mains", MAINS) ;
        sUriMatcher.addURI(Main.AUTHORITY, "main", MAIN_ID) ;
        sUriMatcher.addURI(Main.AUTHORITY, "main/#", MAIN_ID) ;
        
        columnMap.put("id","_ID") ;
        columnMap.put("word","WORD") ;
    }

    public boolean onCreate() {

        /*
         * Creates a new helper object. This method always returns quickly.
         * Notice that the database itself isn't created or opened
         * until SQLiteOpenHelper.getWritableDatabase is called
         */
        mOpenHelper = new MainDatabaseHelper(
            getContext()      // the application context
        );

        return true;
    }
    
    

	
	@Override
	public int delete(Uri arg0, String arg1, String[] arg2) {
		return 0;
	}

	@Override
	public String getType(Uri uri) {
		switch (sUriMatcher.match(uri)) {
		case MAINS:{
			return Main.CONTENT_TYPE;
		}
		case MAIN_ID:{
			return Main.CONTENT_ITEM_TYPE;
		}
		}
		return null;
	}

	@Override
	public Uri insert(Uri uri, ContentValues values) {
		if(sUriMatcher.match(uri) == MAIN_ID){
			throw new IllegalArgumentException("Unknown URI " + uri);
		}
		
		ContentValues value  ;
		if(null != values){
			value = new ContentValues(values) ;
		}else{
			value = new ContentValues() ;
		}
		SQLiteDatabase db = mOpenHelper.getWritableDatabase() ;
		
		long rowId = db.insert(
				"main", 
				null, 
				values) ;
		 // If the insert succeeded, the row ID exists.
        if (rowId > 0) {
            // Creates a URI with the note ID pattern and the new row ID appended to it.
            Uri noteUri = ContentUris.withAppendedId(Uri.parse(Main.CONTENT_URI + "/main/"), rowId);

            // Notifies observers registered against this provider that the data changed.
            getContext().getContentResolver().notifyChange(noteUri, null);
            return noteUri;
        }

        // If the insert didn't succeed, then the rowID is <= 0. Throws an exception.
        throw new SQLException("Failed to insert row into " + uri);
	}

	@Override
	public Cursor query(Uri uri, String[] projection, String selection,
			String[] selectionArgs, String sortOrder) {
		SQLiteQueryBuilder sqb = new SQLiteQueryBuilder() ;
		sqb.setTables("main") ;
		switch (sUriMatcher.match(uri)) {
		case MAINS :
			sqb.setProjectionMap(columnMap) ;
			break ;
		case MAIN_ID :
			sqb.setProjectionMap(columnMap) ;
			sqb.appendWhere("_ID = " + 
					uri.getPathSegments().get(1)) ;
			break ;
		}
		String orderBy;
		// If no sort order is specified, uses the default
		if (TextUtils.isEmpty(sortOrder)) {
			orderBy = "_ID";
		} else {
			// otherwise, uses the incoming sort order
			orderBy = sortOrder;
		}
		
		SQLiteDatabase db = mOpenHelper.getReadableDatabase();
		Cursor c = sqb.query(
							db, 
							projection, 
							selection, 
							selectionArgs, 
							null, 
							null, 
							orderBy) ;
		c.setNotificationUri(getContext().getContentResolver(), uri);
		return c;
	}

	@Override
	public int update(Uri uri, ContentValues values, String selection,
			String[] selectionArgs) {
		return 0;
	}

	// A string that defines the SQL statement for creating a table
	private static final String SQL_CREATE_MAIN = "CREATE TABLE " +
	    "main " +                       // Table's name
	    "(" +                           // The columns in the table
	    " _ID INTEGER PRIMARY KEY, " +
	    " WORD TEXT" +
	    " FREQUENCY INTEGER " +
	    " LOCALE TEXT )";
	/**
	 * Helper class that actually creates and manages the provider's underlying data repository.
	 */
	protected static final class MainDatabaseHelper extends SQLiteOpenHelper {

	    /*
	     * Instantiates an open helper for the provider's SQLite data repository
	     * Do not do database creation and upgrade here.
	     */
	    MainDatabaseHelper(Context context) {
	        super(context, DBNAME, null, 1);
	    }

	    /*
	     * Creates the data repository. This is called when the provider attempts to open the
	     * repository and SQLite reports that it doesn't exist.
	     */
	    public void onCreate(SQLiteDatabase db) {

	        // Creates the main table
	        db.execSQL(SQL_CREATE_MAIN);
	    }

		@Override
		public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
			
		}
	}
	
}

2.定义权限

在manifest 中定义，permission

在<manifest>节点里面，定义permission

<permission android:name="com.hualu.provider.WRITE"></permission>
<permission android:name="com.hualu.provider.READ"></permission>

3.provider添加权限

在<provider> 节点里面添加

android:writePermission和android:readPermission

<provider android:authorities="@string/authority" android:name="ExampleContentProvider" 
            android:writePermission="com.hualu.provider.WRITE" 
            android:readPermission="com.hualu.provider.READ"></provider>

在另一个应用访问这个contentprovider

1.新建一个应用

2.在当前应用的manifest里面添加对之前定义的provider的权限的使用

<uses-permission android:name="com.hualu.provider.WRITE"/>
<uses-permission android:name="com.hualu.provider.READ"/>

ContentValues values = new ContentValues() ;
		values.put("WORD", "abcd") ;
		
		Uri uri = this.getContentResolver().insert(
				Uri.parse("content://com.hualu.contentprovider/mains"),
				values) ;
		String id = uri.getPathSegments().get(1) ;
		
		
		Cursor cAll = this.getContentResolver().query(
				Uri.parse("content://com.hualu.contentprovider/mains"), 
				null, 
				null, 
				null,
				null);
		
		Cursor c = this.getContentResolver().query(
				Uri.parse("content://com.hualu.contentprovider/main/1"), 
				null, 
				null, 
				null,
				null);
		
		
		Toast.makeText(this, "insert success id = " + id + " ," +
				" \r\n All = " + cAll.getCount() + " , " +
				"\r\n one = " + c.getCount(),
				Toast.LENGTH_SHORT).show() ;

代码下载地址：

Contentprovider应用: http://download.csdn.net/detail/luhuajcdd/5140008

调用ContentProvider应用:http://download.csdn.net/detail/luhuajcdd/5140027