Android下查询系统源码看短信的显示

查询系统源码看短信的显示如何写:

在providers.telephony:SmsProvider:

 

1.确定怎么查数据库中的表:

Uri = content://sms/conversations

 

 

 

2.确定查询语句: select  映射条目 from 表  where 查询条件

 

 

表:

sms, (SELECT thread_id AS group_thread_id, MAX(date)AS group_date,COUNT(*) AS msg_count FROM sms GROUP BY thread_id) AS groups

查询条件:

sms.thread_id = groups.group_thread_id AND sms.date = groups.group_date

映射条目:

sms.body AS snippet 

 sms.thread_id AS thread_id 

 groups.msg_count AS msg_count

 

 

所以查询语句:

 

select 

 sms.body AS snippet,sms.thread_id AS thread_id,groups.msg_count AS msg_count

from 

  sms, (SELECT thread_id AS group_thread_id, MAX(date)AS group_date,COUNT(*) AS msg_count FROM sms GROUP BY thread_id) AS groups

where

 sms.thread_id = groups.group_thread_id AND sms.date = groups.group_date

 

查询结果:

 

 

 

 

还需要号码,日期/时间

但看系统源码的映射列都已经写死,用户若添加自己需要的列会将系统的列覆盖:

看系统如何解决:找query:

这里的query是用户来调用的,所以projectionIn是用户传进来的,

 

继续找:同一个方法内,看query怎么处理projictionIn的,

 

点击查看如何处理用户传进来的projectionIn的,

 

 

 再次点击发现进不去,为本类的方法:查找:

 

第一个在判断里面,略去不看,看第二个:将projection等各种参数建立成为一个sql语句,点击,发现进不去,,buildQuery为一个本类方法:查找其实现:

 

 

点击发现是一个本类方法,查找其实现:

 

分析源码:

 

将需要添加的列写好,测试正确性:

select sms.body AS snippet,sms.thread_id AS thread_id,groups.msg_count AS msg_count,sms.address as address,sms.date as date

from  sms, (SELECT thread_id AS group_thread_id, MAX(date)AS group_date,COUNT(*) AS msg_count FROM sms GROUP BY thread_id) AS groups

where sms.thread_id = groups.group_thread_id AND sms.date = groups.group_date

 

 

 

 详细代码:

 

1.

package com.itcode.SMSManager.utils;

import android.net.Uri;

public class SmsUtils {

 public static final Uri SMSURL = Uri.parse("content://sms/conversations");
}

2.

package com.itcode.SMSManager;

import android.app.Activity;
import android.content.AsyncQueryHandler;
import android.content.ContentResolver;
import android.database.Cursor;
import android.os.Bundle;
import android.util.Log;

import com.itcode.SMSManager.utils.SmsUtils;

public class ConversationActivity extends Activity {

    private ConversationAsyncQueryHandler asyncQuery;
    private static final String[] CONVERSATIONSMSPROJECTION = {
            "sms.body AS snippet", "sms.thread_id AS thread_id",
            "groups.msg_count AS msg_count", "sms.address as address",
            "sms.date as date" };
    public static final String TAG = "ConversationActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_conversion);

        asyncQuery = new ConversationAsyncQueryHandler(getContentResolver());
        asyncQuery.startQuery(0, null, SmsUtils.SMSURL,
                CONVERSATIONSMSPROJECTION, null, null, "date DESC");

    }

    private class ConversationAsyncQueryHandler extends AsyncQueryHandler {

        private String value;
        private String  columnName;

        public ConversationAsyncQueryHandler(ContentResolver cr) {
            super(cr);
            // TODO Auto-generated constructor stub
        }

        /**
         * 当异步查询结束后调用的方法
         * Called when an asynchronous query is completed.
         * token the token to identify the query, passed in from startQuery.
         * cookie 添加额外的数据的 the cookie object passed in from startQuery.
         * cursor 查询出来的结果集The cursor holding the results from the query.
         */
        @Override
        protected void onQueryComplete(int token, Object cookie, Cursor cursor) {
            // TODO Auto-generated method stub
            super.onQueryComplete(token, cookie, cursor);
            if(cursor != null && cursor.getCount()>0){
                int columnCount = cursor.getColumnCount();
                while(cursor.moveToNext()){
                    for(int i=0;i<columnCount;i++){
                        columnName = cursor.getColumnName(i);
                        value = cursor.getString(i);
                        Log.i(TAG,"当前是第"+cursor.getPosition() + "行:" + columnName + ":" + value);
                    }
                }
            }
        }

    }
}

 

运行结果: