求 在独立service 中 调用contentprovider的方法

求 在独立service 中 调用contentprovider的方法

已用方法，调用会出错

       <provider 
            android:authorities="com.bu3GZ.provider.Download"
            android:name=".DBContentProvider" >
        </provider>

package Insper.bu3GZ.Download;

import java.util.HashMap;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.Context;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.SQLException;
import android.net.Uri;

/*
 * 提供外部访问任务信息
 * 线程信息直接调用DownloadDBHelper
 */
public class DBContentProvider extends ContentProvider {
    private static final UriMatcher sUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
    private DownloadDBHelper mOpenHelper;
    //private Context ct;
    static {
        sUriMatcher.addURI("com.bu3GZ.provider.Download",
                "download_taskRecord", 1);
        sUriMatcher.addURI("com.bu3GZ.provider.Download",
                "download_taskRecord/#", 2);
    }

    //public void DBContentProvider(Context context) {
        //android.os.Debug.waitForDebugger();
        //mOpenHelper = new DownloadDBHelper(context, null, null, 0);// 使用默认值
        //this.ct = context;
    //}

    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        // TODO Auto-generated method stub
        android.os.Debug.waitForDebugger();
        if (!checkUri(uri))
            return 0;
        int e;
        e = this.mOpenHelper.wParamSQLiteDatabase.delete("download_taskRecord",
                selection, selectionArgs);
        if (e == 0)
            getContext().getContentResolver().notifyChange(uri, null);
        return 0;
    }

    @Override
    public String getType(Uri uri) {
        // TODO Auto-generated method stub
        android.os.Debug.waitForDebugger();
        return "com.bu3GZ.provider.Download";
    }

    @Override
    public Uri insert(Uri uri, ContentValues values) {
        // TODO Auto-generated method stub
        android.os.Debug.waitForDebugger();
        if (!checkUri(uri))
            return uri;
        for (ContentValues cv = new ContentValues(values);; cv = new ContentValues()) {
            if (-1 == mOpenHelper.wParamSQLiteDatabase.insert(
                    "download_taskRecord", null, values))
                throw new SQLException("Failed to insert row into " + uri);
            getContext().getContentResolver().notifyChange(uri, null);
        }
    }

    @Override
    public boolean onCreate() {
        // TODO Auto-generated method stub
        android.os.Debug.waitForDebugger();
        this.mOpenHelper = new DownloadDBHelper(this.getContext(), "", null, 1);
        return false;
    }

    @Override
    public Cursor query(Uri uri, String[] projection, String selection,
            String[] selectionArgs, String sortOrder) {
        // TODO Auto-generated method stub
        android.os.Debug.waitForDebugger();
        if (!checkUri(uri))
            return null;
        return mOpenHelper.wParamSQLiteDatabase.query("download_taskRecord",
                projection, selection, selectionArgs, null, null, sortOrder);

    }

    @Override
    public int update(Uri uri, ContentValues values, String selection,
            String[] selectionArgs) {
        // TODO Auto-generated method stub
        android.os.Debug.waitForDebugger();
        if (!checkUri(uri))
            return 0;
        if (mOpenHelper.wParamSQLiteDatabase.update("download_taskRecord",
                values, selection, selectionArgs) <= 0)
            return 0;
        else
            getContext().getContentResolver().notifyChange(uri, null);
        return 0;
    }

    /*
     * 检查是否是本地操作
     * 
     * @param 内容操作链接
     */
    private boolean checkUri(Uri uri) {
        switch (sUriMatcher.match(uri)) {
        case 1:
            break;
        case 2:
            break;
        default:
            throw new IllegalArgumentException("Unknown URI " + uri);
        }
        return true;
    }
}

在外部用会出错

                ContentResolver cr = getContentResolver();
                Uri uri = Uri
                        .parse("content://com.bu3GZ.provider.Download/download_taskRecord");
                cr.acquireContentProviderClient(uri);
                String URL = cr.getType(uri);
                cr.query(uri, new String[]{"file_name"}, null, null, null);

gettype 就会出错 在service中的contentprovider 设置断点不进入 包含oncreate 中的断点