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>
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
