android – 无法找到提供商信息

我已经阅读了关于这个问题的所有内容,但没有通过这个问题.

我有一个简单的应用程序从MainActivity开始,我的Content Provider在AndroidManifest.xml中正确定义,ContentProvider类看起来很好……这已经在运行4.3的nexus i9250和运行4.2.1的Asus Memo Pad上进行了测试当VDevices运行Jelly Bean时.应用程序在每个实例中运行并且不会崩溃,LogCat给我的唯一一件事就是“找不到de.somename.provider的提供程序信息”,其中我的一个片段试图查询Content Provider并获取游标.这里的代码：

AndroidManifest.xml中

<?xml version="1.0" encoding="utf-8"?>

<uses-sdk android:minSdkVersion="14"
          android:targetSdkVersion="18" />

<application android:allowBackup="true"
             android:icon="@drawable/ic_launcher"
             android:label="@string/app_name"
             android:theme="@style/AppTheme" >
    <activity android:name="de.somename.hvk3.MainActivity"
              android:label="@string/app_name" >
              <intent-filter>
                  <action android:name="android.intent.action.MAIN" />
                  <category android:name="android.intent.category.LAUNCHER" />
              </intent-filter></activity>
    <activity android:name="de.somename.hvk3.UserSettingActivity"
              android:label="@string/settings" ></activity>
    <provider android:authorities="de.somename.provider"
              android:enabled="true"
              android:multiprocess="true"
              android:name=".hvkContentProvider"
              android:exported="true" ></provider>
</application>

hvkContentProvider.java

public class hvkContentProvider extends ContentProvider {

private static final String DATABASE_NAME = "hvkDB";
private static final int DATABASE_VERSION = 1;
public static final String Authority = "de.somename.provider";
public static final String ElementPath = "/hv_kontakte";
public static final Uri CONTENT_URI = Uri.parse("content://" + Authority + ElementPath);
private static final int ALLROWS = 1;
private static final int SINGLE_ROW = 2;

private static final UriMatcher suriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
static{
    suriMatcher.addURI("de.somename.provider",ElementPath,ALLROWS);
    suriMatcher.addURI("de.somename.provider",ElementPath + "/#",SINGLE_ROW);
}

public static final String KEY_ID = "_id";
public static final String KEY_TYPE = "type";
public static final String KEY_CLTYP = "cltyp";
public static final String KEY_MDT = "mdt";
public static final String KEY_OBJ = "obj";
public static final String KEY_VTR = "vtr";
public static final String KEY_FKZ = "fkz";
public static final String KEY_NAME = "name";
public static final String KEY_VNAME = "vname";
public static final String KEY_TEL = "tel";
public static final String KEY_FAX = "fax";
public static final String KEY_MOBIL = "mobil";
public static final String KEY_EMAIL = "email";

private MysqLiteOpenHelper myOpenHelper;

@Override
public boolean onCreate() {

    myOpenHelper = new MysqLiteOpenHelper(getContext(),DATABASE_NAME,null,DATABASE_VERSION);
    return true;
}

@Override
public Cursor query(Uri uri,String[] projection,String selection,String[] selectionArgs,String sortOrder) {

    sqliteDatabase db = myOpenHelper.getReadableDatabase();

    String groupBy = null;
    String having = null;
    sqliteQueryBuilder queryBuilder = new sqliteQueryBuilder();
    queryBuilder.setTables(MysqLiteOpenHelper.DATABASE_TABLE);

    switch(suriMatcher.match(uri)){
    case SINGLE_ROW:
        String rowID = uri.getPathSegments().get(1);
        queryBuilder.appendWhere(KEY_ID + "=" + rowID);
    default: break;
    }

    Cursor cursor = queryBuilder.query(db,projection,selection,selectionArgs,groupBy,having,sortOrder);

    return cursor;
}

@Override
public int delete(Uri uri,String[] selectionArgs) {
    sqliteDatabase db = myOpenHelper.getWritableDatabase();
    switch(suriMatcher.match(uri)){
    case SINGLE_ROW:
        String rowID = uri.getPathSegments().get(1);
        selection = KEY_ID + "=" + rowID
                + (!TextUtils.isEmpty(selection) ?
                " AND (" + selection + ')' : "");
    default: break;
    }
    //To return the number of deleted items you must specify a where clause. To delete all rows and return a value pass in "1"
    if (selection == null)
        selection = "1";

    return db.delete(MysqLiteOpenHelper.DATABASE_TABLE,selectionArgs);
}

@Override
public Uri insert(Uri uri,ContentValues values) {

    sqliteDatabase db = myOpenHelper.getWritableDatabase();
    String nullColumnHack = null;
    long id = db.insert(MysqLiteOpenHelper.DATABASE_TABLE,nullColumnHack,values);

    if(id > -1){
        Uri insertedId = ContentUris.withAppendedId(CONTENT_URI,id);
        getContext().getContentResolver().notifyChange(insertedId,null);
        return insertedId;
    }
    else
        return null;
}

@Override
public int update(Uri uri,ContentValues values,String[] selectionArgs) {

    sqliteDatabase db = myOpenHelper.getWritableDatabase();

    switch(suriMatcher.match(uri)){
    case SINGLE_ROW:
        String rowID = uri.getPathSegments().get(1);
        selection = KEY_ID + "=" + rowID
            + (!TextUtils.isEmpty(selection) ?
            " AND (" + selection + ')' : "");
    default: break;
    }

    return db.update(MysqLiteOpenHelper.DATABASE_TABLE,values,selectionArgs);
}

@Override
public String getType(Uri uri) {
    switch(suriMatcher.match(uri)){
    case ALLROWS:
        return "vnd.android.cursor.dir/vnd.somename.contacts";
    case SINGLE_ROW:
        return "vnd.android.cursor.item/vnd.somename.contacts";
    default:
        throw new IllegalArgumentException("Unsupported URI: " + uri);
    }
}

@Override
public ParcelFileDescriptor openFile(Uri uri,String mode) throws FileNotFoundException {

    //Find the row ID and use it as a filename
    String rowID = uri.getPathSegments().get(1);

    //Create a file object in the applications external files directory
    String picsDir = Environment.DIRECTORY_PICTURES;
    File file = new File(getContext().getExternalFilesDir(picsDir),rowID);

    if(!file.exists()) {
        try{
            file.createNewFile();
        } catch (IOException e) {
            //Log.d(TAG,"File creation Failed: " + e.getMessage());
        }
    }

    //Translate the mode parameter to the corresponding Parcel File Descriptor open mode
    int fileMode = 0;
    if(mode.contains("w"))
        fileMode |= ParcelFileDescriptor.MODE_WRITE_ONLY;
    if(mode.contains("r"))
        fileMode |= ParcelFileDescriptor.MODE_READ_ONLY;
    if(mode.contains("+"))
        fileMode |= ParcelFileDescriptor.MODE_APPEND;

    return ParcelFileDescriptor.open(file,fileMode);
}

private class MysqLiteOpenHelper extends sqliteOpenHelper {     //used to be static

    public static final String DATABASE_TABLE = "hv_kontakte";
    private static final String DATABASE_CREATE = 
            "CREATE TABLE " + DATABASE_TABLE + "(" + KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," +
                    KEY_TYPE + " TEXT," + KEY_CLTYP + " TEXT," + KEY_MDT + " INTEGER," + KEY_OBJ + " INTEGER,"
                    + KEY_VTR + " INTEGER," + KEY_FKZ + " INTEGER," + KEY_NAME + " TEXT," + KEY_VNAME + " TEXT,"
                    + KEY_TEL + " TEXT," + KEY_FAX + " TEXT," + KEY_MOBIL + " TEXT," + KEY_EMAIL + " TEXT)";

    public MysqLiteOpenHelper(Context context,String name,sqliteDatabase.CursorFactory factory,int version){
        super(context,DATABASE_VERSION);
    }

    @Override
    public void onCreate(sqliteDatabase database) {
        database.execsql(DATABASE_CREATE);
        hvkContentProvider.this.insertSomeContacts();
    }

    @Override
    public void onUpgrade(sqliteDatabase database,int oldVersion,int newVersion) {
        database.execsql("DROP TABLE IF EXISTS" + DATABASE_TABLE);
        onCreate(database);
    }
}

}

HdwFragment.java

public class HdwFragment extends Fragment{

private SimpleCursorAdapter hdwDataAdapter;
private ListView listview;
public static final String ARG_SECTION_NUMBER = "section_number";
private static final String TAG = "HdwFragment";
public HdwFragment(){}

@Override
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState){

    Context context = getActivity();
    View rootView = inflater.inflate(R.layout.fragment_all,container,false);
    TextView dummyTextView = (TextView) rootView.findViewById(R.id.section_label);
    dummyTextView.setText("Dienstleister");
    //android.support.v4.app.LoaderManager loaderManager = getLoaderManager();

    Log.i(TAG,"Before getContentResolver");
    ContentResolver cr = context.getContentResolver();
    Log.i(TAG,"Before result_columns");
    String[] result_columns = new String[] {
            hvkContentProvider.KEY_ID,hvkContentProvider.KEY_TYPE,hvkContentProvider.KEY_CLTYP,hvkContentProvider.KEY_NAME,hvkContentProvider.KEY_VNAME
    };
    Log.i(TAG,"Before where,whereArgs and order");
    String where = null;
    String whereArgs[] = null;
    String order = null;
    Log.i(TAG,"Before resultCursor action");
    Log.i(TAG,"hvkContentProvider URI: " + hvkContentProvider.CONTENT_URI);
    Cursor resultCursor = cr.query(hvkContentProvider.CONTENT_URI,result_columns,where,whereArgs,order);
    Log.i(TAG,"resultCursor = " + resultCursor);
    Log.i(TAG,"Before fromColumns");
    String[] fromColumns = new String[]{
            hvkContentProvider.KEY_TYPE,hvkContentProvider.KEY_VNAME    
    };
    Log.i(TAG,"Before toViews");
    int[] toViews = new int[]{
        R.id.contactType,R.id.contactCltype,R.id.contactName,R.id.contactVname
    };
    Log.i(TAG,"Before Adapter");
    hdwDataAdapter = new SimpleCursorAdapter(getActivity(),R.layout.object_list_item,resultCursor,fromColumns,toViews,0);
    listview = (ListView) rootView.findViewById(R.id.list_all);
    listview.setAdapter(hdwDataAdapter);
    Log.i(TAG,"Before return Layout");
    return (LinearLayout) rootView;
}

@Override
public void onActivityCreated(Bundle savedInstanceState){
    super.onActivityCreated(savedInstanceState);

    //Bundle args = null;
    //loaderManager.initLoader(LOADER_ID,args,loaderCallback);
}

}

方法：insertSomeFunctions()我已经遗漏了,因为它在这里没有什么区别,会尽快给这个奖励.真的需要完成这件事.

解决方法

<provider android:authorities="de.somename.provider"
    android:enabled="true"
    android:multiprocess="true"
    android:name=".hvkContentProvider"
    android:exported="true" ></provider>

来自< provider>：Link的参考页面

android:authorities: ……To avoid
conflicts,authority names should use a Java-style naming convention
(such as com.example.provider.cartoonprovider). Typically,it’s the
name of the ContentProvider subclass that implements the provider.

在您的情况下,android：authority应该具有值：de.somename.provider.hvkContentProvider.

android:name:…… The name of the class that implements the content
provider,a subclass of ContentProvider. This should be a fully
qualified class name (such as,
“com.example.project.TransportationProvider”). However,as a
shorthand,if the first character of the name is a period,it is
appended to the package name specified in the element.

因此,如果要在AndroidManifest.xml的清单标记中定义包,请确保hvkContentProvider在该包中.否则,将android：name =“.hvkContentProvider”更改为android：name =“de.somename.hvk3.hvkContentProvider”或your.package.name.hvkContentProvider