关于ContentProvider

public void insert(View v){
		Uri uri=Uri.parse("content://com.ylj.provider.personprovider/insert");
		ContentValues values=new ContentValues();
		values.put("personid", 3);
		values.put("name", "Jerry");
		values.put("password", "147258");
		ContentResolver contentResolver=getContentResolver();
		contentResolver.insert(uri, values);
	}

@Override
 public Cursor query(Uri uri, String[] projection, String selection,
   String[] selectionArgs, String sortOrder) {
  System.out.println("uri==>"+uri);
  SQLiteDatabase db=dbOpenHelper.getReadableDatabase();
  Cursor cursor=null;
  if(uriMatcher.match(uri)==QUERY){
   System.out.println("db==>"+db);
   cursor=db.query("person", projection, selection, selectionArgs, null, null, sortOrder);
   
  }else{
   throw new IllegalArgumentException("路径不匹配，不能执行查询操作哦");
  }
  return cursor;
 }

在写uri的时候，一直报cursor空指针，原来是因为没有加schema：content://，弄成了Uri uri=Uri.parse("com.ylj.provider.personprovider/insert");