android Content provider 使用时出现的错误。

错误提示信息：
java.lang.SecurityException: Permission Denial: opening provider com.example.db.PersonProvider from ProcessRecord{2c6e34f0 24384:com.dzr.other2/u0a10051} (pid=24384, uid=10051) that is not exported from uid 10050
at android.os.Parcel.readException(Parcel.java:1425)
at android.os.Parcel.readException(Parcel.java:1379)
at android.app.ActivityManagerProxy.getContentProvider(ActivityManagerNative.java:2530)
at android.app.ActivityThread.acquireProvider(ActivityThread.java:4460)
at android.app.ContextImpl$ApplicationContentResolver.acquireProvider(ContextImpl.java:1987)
at android.content.ContentResolver.acquireProvider(ContentResolver.java:1054)
at android.content.ContentResolver.insert(ContentResolver.java:860)
at com.dzr.test.AccessContentProvierTest.testInsert(AccessContentProvierTest.java:21)
at java.lang.reflect.Method.invokeNative(Native Method)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:190)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:175)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:555)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1661)



test代码：

package com.dzr.test;



import android.content.ContentResolver;

import android.content.ContentValues;

import android.net.Uri;

import android.test.AndroidTestCase;



public class AccessContentProvierTest extends AndroidTestCase

{



	public void testInsert()throws Exception

	{

		Uri uri = Uri.parse("content://cn.dzr.personprovider/person");

		ContentResolver resolver = this.getContext().getContentResolver();

		ContentValues values = new ContentValues();

		

		values.put("name", "laoli");

		values.put("phone", "13786788939");

		values.put("amount", 12212121);

		

		resolver.insert(uri, values);

	}

}

源数据代码：

package com.example.db;



import com.example.service.DbOpenHelper;



import android.content.ContentProvider;

import android.content.ContentUris;

import android.content.ContentValues;

import android.content.UriMatcher;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

import android.net.Uri;



public class PersonProvider extends ContentProvider

{



	private DbOpenHelper dbOpenHelper;

	private static final UriMatcher MATCHER = new UriMatcher(UriMatcher.NO_MATCH);

	private static final int PERSONS = 1;

	static{

		MATCHER.addURI("cn.dzr.personprovider", "person", PERSONS);

	}

	public boolean onCreate()

	{

		dbOpenHelper = new DbOpenHelper(this.getContext());

		return true;

	}

	@Override

	public int delete(Uri arg0, String arg1, String[] arg2)

	{

		// TODO Auto-generated method stub

		return 0;

	}



	@Override

	public String getType(Uri uri)

	{

		// TODO Auto-generated method stub

		return null;

	}



	@Override

	public Uri insert(Uri uri, ContentValues values)

	{

		SQLiteDatabase db = this.dbOpenHelper.getWritableDatabase();

		

		switch(MATCHER.match(uri))

		{

		case 1:

			long rowid = db.insert("person", null, values);

		

		//	Uri insertUri = Uri.parse("content://cn.dzr.personprovider/person" + rowid);

			Uri insertUri = ContentUris.withAppendedId(uri, rowid);

			return insertUri;

			

		default:

			throw new IllegalArgumentException("this is an unknow Uri:" + uri);

			

			  

		}		

	}



	



	@Override

	public Cursor query(Uri uri, String[] projection, String selection,

			String[] selectionArgs, String sortOrder)

	{

		// TODO Auto-generated method stub

		return null;

	}



	@Override

	public int update(Uri uri, ContentValues values, String selection,

			String[] selectionArgs)

	{

		// TODO Auto-generated method stub

		return 0;

	}



}

情况如下：
开始我已经在模拟器上启动了数据库代码。
但是过了很久后再使用测试代码，这个时候，系统提示错误参数的信息。
于是我再重新启动了下数据库的程序。
再次运行Test程序，就提示这个错误。