如何修复在Android Content provider中找不到的Content provider URL?

编程入门行业动态更新时间:2024-10-23 18:30:24

本文介绍了如何修复在Android Content provider中找不到的Content provider URL?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！问题描述

我已遵循以下教程 www.vogella.de/articles/AndroidSQLite/article.htm

I have followed the below tutorial www.vogella.de/articles/AndroidSQLite/article.htm

但是在单击确认"按钮后出现此异常

But getting this exception after clicking on "confirm" button

01-20 10:18:14.585: E/AndroidRuntime(2006): Caused by: java.lang.IllegalArgumentException: Unknown URL content://com.example.todos.contentprovider/todos 01-20 10:18:14.585: E/AndroidRuntime(2006): at android.content.ContentResolver.insert(ContentResolver.java:910) 01-20 10:18:14.585: E/AndroidRuntime(2006): at com.example.todos.TodoDetailActivity.saveState(TodoDetailActivity.java:122) 01-20 10:18:14.585: E/AndroidRuntime(2006): at com.example.todos.TodoDetailActivity.onPause(TodoDetailActivity.java:100)

TodoDetailActivity

public class TodoDetailActivity extends Activity { private Spinner mCategory; private EditText mTitleText; private EditText mBodyText; private Uri todoUri; @Override protected void onCreate(Bundle bundle) { super.onCreate(bundle); setContentView(R.layout.todo_edit); mCategory = (Spinner) findViewById(R.id.category); mTitleText = (EditText) findViewById(R.id.todo_edit_summary); mBodyText = (EditText) findViewById(R.id.todo_edit_description); Button confirmButton = (Button) findViewById(R.id.todo_edit_button); Bundle extras = getIntent().getExtras(); // check from the saved Instance todoUri = (bundle == null) ? null : (Uri) bundle .getParcelable(MyTodoContentProvider.CONTENT_ITEM_TYPE); // Or passed from the other activity if (extras != null) { todoUri = extras .getParcelable(MyTodoContentProvider.CONTENT_ITEM_TYPE); fillData(todoUri); } confirmButton.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { if (TextUtils.isEmpty(mTitleText.getText().toString())) { makeToast(); } else { setResult(RESULT_OK); finish(); } } }); } private void fillData(Uri uri) { String[] projection = { TodoTable.COLUMN_SUMMARY, TodoTable.COLUMN_DESCRIPTION, TodoTable.COLUMN_CATEGORY }; Cursor cursor = getContentResolver().query(uri, projection, null, null, null); if (cursor != null) { cursor.moveToFirst(); String category = cursor.getString(cursor .getColumnIndexOrThrow(TodoTable.COLUMN_CATEGORY)); for (int i = 0; i < mCategory.getCount(); i++) { String s = (String) mCategory.getItemAtPosition(i); if (s.equalsIgnoreCase(category)) { mCategory.setSelection(i); } } mTitleText.setText(cursor.getString(cursor .getColumnIndexOrThrow(TodoTable.COLUMN_SUMMARY))); mBodyText.setText(cursor.getString(cursor .getColumnIndexOrThrow(TodoTable.COLUMN_DESCRIPTION))); // always close the cursor cursor.close(); } } protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); saveState(); outState.putParcelable(MyTodoContentProvider.CONTENT_ITEM_TYPE, todoUri); } @Override protected void onPause() { super.onPause(); saveState(); } private void saveState() { String category = (String) mCategory.getSelectedItem(); String summary = mTitleText.getText().toString(); String description = mBodyText.getText().toString(); // only save if either summary or description // is available if (description.length() == 0 && summary.length() == 0) { return; } ContentValues values = new ContentValues(); values.put(TodoTable.COLUMN_CATEGORY, category); values.put(TodoTable.COLUMN_SUMMARY, summary); values.put(TodoTable.COLUMN_DESCRIPTION, description); if (todoUri == null) { // New todo todoUri = getContentResolver().insert( MyTodoContentProvider.CONTENT_URI, values); } else { // Update todo getContentResolver().update(todoUri, values, null, null); } } private void makeToast() { Toast.makeText(TodoDetailActivity.this, "Please maintain a summary", Toast.LENGTH_LONG).show(); } }

MyTodoContentProvider

public class MyTodoContentProvider extends ContentProvider{ //database private TodoDatabaseHelper database; //Used for the uriMatcher private static final int TODOS = 10; private static final int TODO_ID = 20; private static final String AUTHORITY = "com.example.todos.contentprovider"; private static final String BASE_PATH = "todos"; public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY+ "/" + BASE_PATH); public static final String CONTENT_TYPE = ContentResolver.CURSOR_DIR_BASE_TYPE +"/todos"; public static final String CONTENT_ITEM_TYPE = ContentResolver.CURSOR_ITEM_BASE_TYPE + "/todo"; private static final UriMatcher sURIMatcher = new UriMatcher(UriMatcher.NO_MATCH); static { sURIMatcher.addURI(AUTHORITY, BASE_PATH, TODOS); sURIMatcher.addURI(AUTHORITY, BASE_PATH + "/#", TODO_ID); } @Override public boolean onCreate() { database = new TodoDatabaseHelper(getContext()); return false; } @Override public Cursor query(Uri uri,String[] projection, String selection, String[] selectionArgs, String sortOrder) { // Uisng SQLiteQueryBuilder instead of query() method SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder(); // check if the caller has requested a column which does not exists checkColumns(projection); //set the table queryBuilder.setTables(TodoTable.TABLE_TODO); int uriType = sURIMatcher.match(uri); switch (uriType) { case TODOS: break; case TODO_ID: // adding the ID to the original query queryBuilder.appendWhere(TodoTable.COLUMN_ID + "=" + uri.getLastPathSegment()); break; default: throw new IllegalArgumentException("Unknown URI: " + uri); } SQLiteDatabase db = database.getWritableDatabase(); Cursor cursor = queryBuilder.query(db, projection, selection, selectionArgs, null, null, sortOrder); // make sure that potential listeners are getting notified cursor.setNotificationUri(getContext().getContentResolver(), uri); return cursor; } @Override public String getType(Uri uri) { return null; } @Override public Uri insert(Uri uri, ContentValues values) { int uriType = sURIMatcher.match(uri); SQLiteDatabase sqlDB = database.getWritableDatabase(); long id = 0; switch (uriType) { case TODOS: id = sqlDB.insert(TodoTable.TABLE_TODO, null, values); break; default: throw new IllegalArgumentException("Unknown URI: " + uri); } getContext().getContentResolver().notifyChange(uri, null); return Uri.parse(BASE_PATH + "/" + id); } @Override public int delete(Uri uri, String selection,String[] selectionArgs) { int uriType = sURIMatcher.match(uri); SQLiteDatabase sqlDB = database.getWritableDatabase(); int rowsDeleted = 0; switch (uriType) { case TODOS: rowsDeleted = sqlDB.delete(TodoTable.TABLE_TODO,selection, selectionArgs); break; case TODO_ID: String id = uri.getLastPathSegment(); if(TextUtils.isEmpty(selection)) { rowsDeleted = sqlDB.delete(TodoTable.TABLE_TODO,TodoTable.COLUMN_ID + "=" + id,null); } else { rowsDeleted = sqlDB.delete(TodoTable.TABLE_TODO,TodoTable.COLUMN_ID + "=" + id + "and" + selection ,selectionArgs); } default: throw new IllegalArgumentException("Unknown URI: " + uri); } getContext().getContentResolver().notifyChange(uri, null); return rowsDeleted; } @Override public int update(Uri uri,ContentValues values,String selection,String[] selectionArgs) { int uriType = sURIMatcher.match(uri); SQLiteDatabase sqlDb = database.getWritableDatabase(); int rowsUpdated = 0; switch (uriType) { case TODOS: rowsUpdated = sqlDb.update(TodoTable.TABLE_TODO, values, selection, selectionArgs); break; case TODO_ID: String id = uri.getLastPathSegment(); if(TextUtils.isEmpty(selection)) { rowsUpdated = sqlDb.update(TodoTable.TABLE_TODO, values, TodoTable.COLUMN_ID + "=" + id, null); } else { rowsUpdated = sqlDb.update(TodoTable.TABLE_TODO, values, TodoTable.COLUMN_ID + "=" + id + "and" + selection, selectionArgs); } break; default: throw new IllegalArgumentException("Unknown URI: " + uri); } getContext().getContentResolver().notifyChange(uri, null); return rowsUpdated; } private void checkColumns(String[] projection) { String[] available = {TodoTable.COLUMN_CATEGORY,TodoTable.COLUMN_SUMMARY,TodoTable.COLUMN_DESCRIPTION,TodoTable.COLUMN_ID}; HashSet<String> requestedColumns = new HashSet<String>(Arrays.asList(projection)); HashSet<String> availableColumns = new HashSet<String>(Arrays.asList(available)); if(projection != null) { if (!availableColumns.containsAll(requestedColumns)) { throw new IllegalArgumentException("Unknown columns in projection"); } } } }

TodoDatabaseHelper

public class TodoDatabaseHelper extends SQLiteOpenHelper{ private static final String DATABASE_NAME = "todotable.db"; private static final int DATABASE_VERSION = 1; public TodoDatabaseHelper(Context context) { super(context,DATABASE_NAME,null,DATABASE_VERSION); } //Method is called during creation of database @Override public void onCreate(SQLiteDatabase database) { TodoTable.onCreate(database); } // Method is called during an upgrade of the database, // e.g. if you increase the database version @Override public void onUpgrade(SQLiteDatabase database, int oldVersion, int newVersion) { TodoTable.onUpgrade(database, oldVersion, newVersion); } }

推荐答案

您正在使用

private static final String AUTHORITY = "com.example.todos.contentprovider"; // It should same as you defined in manifest

所以

Caused by: java.lang.IllegalArgumentException: Unknown URL content://com.example.todos.contentprovider/todos