我正在创建一个简单的ContentProvider来访问我的SQLite3数据库中的数据。虽然我已经在我的AndroidManifest.xml文件中声明了提供程序，但我收到了“无法找到com.tur_cirdictionary.turkishcircassiandictionary的提供者信息”。
这里有什么问题？
这是我的AndroidManifest.xml和ContentProvider文件。如果需要，This是项目的Github链接。
//AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.tur_cirdictionary.turkish_circassiandictionary">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".ArchiveActivity"></activity>
<activity android:name=".Searchable">
<intent-filter>
<action android:name="android.intent.action.SEARCH" />
</intent-filter>
<meta-data
android:name="android.app.searchable"
android:resource="@xml/searchable" />
</activity>
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<meta-data
android:name="android.app.default_searchable"
android:value=".Searchable" />
</activity>
<provider
android:name="com.tur_cirdictionary.turkish_circassiandictionary.data.WordProvider"
android:authorities=
"com.tur_cirdictionary.turkish_circassiandictionary"
android:exported="false" />
</application>
//WordProvider.java
package com.tur_cirdictionary.turkish_circassiandictionary.data;
import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.Log;
import static com.tur_cirdictionary.turkish_circassiandictionary.data.WordContract.BASE_CONTENT_URI;
import static com.tur_cirdictionary.turkish_circassiandictionary.data.WordContract.WordEntry;
public class WordProvider extends ContentProvider {
public static final String LOG_TAG = WordProvider.class.getSimpleName();
private static final int WORDS = 100;
private static final int WORD_ID = 101;
private static final UriMatcher sUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
static {
sUriMatcher.addURI(WordContract.CONTENT_AUTHORITY, WordContract.PATH_WORDS, WORDS);
sUriMatcher.addURI(WordContract.CONTENT_AUTHORITY, WordContract.PATH_WORDS
+ "/#", WORD_ID);
}
private WordDbHelper wordDbHelper;
@Override
public boolean onCreate() {
wordDbHelper = new WordDbHelper(getContext());
return true;
}
@Nullable
@Override
public Cursor query(@NonNull Uri uri, @Nullable String[] projection, @Nullable String selection,
@Nullable String[] selectionArgs, @Nullable String sortOrder) {
SQLiteDatabase database = wordDbHelper.getReadableDatabase();
Cursor cursor;
int match = sUriMatcher.match(uri);
switch (match) {
case WORDS:
cursor = database.query(WordEntry.TABLE_NAME,
projection,
selection,
selectionArgs,
null,
null,
sortOrder);
break;
case WORD_ID:
selection = WordEntry._ID + "=?";
selectionArgs = new String[] {String.valueOf(ContentUris.parseId(uri))};
cursor = database.query(WordEntry.TABLE_NAME,
projection,
selection,
selectionArgs,
null,
null,
sortOrder);
break;
default:
throw new IllegalArgumentException("Cannot query unknown URI " + uri);
}
return cursor;
}
@Nullable
@Override
public String getType(@NonNull Uri uri) {
int match = sUriMatcher.match(uri);
switch (match) {
case WORDS:
return WordEntry.CONTENT_LIST_TYPE;
case WORD_ID:
return WordEntry.CONTENT_ITEM_TYPE;
default:
throw new IllegalStateException("Unknown URI " + uri + " with match" + match);
}
}
@Nullable
@Override
public Uri insert(@NonNull Uri uri, @Nullable ContentValues values) {
int match = sUriMatcher.match(uri);
switch (match) {
case WORDS:
return insertWord(uri, values);
default:
throw new IllegalArgumentException("Insertion is not supported for " + uri);
}
}
@Override
public int delete(@NonNull Uri uri, @Nullable String selection,
@Nullable String[] selectionArgs) {
int match = sUriMatcher.match(uri);
SQLiteDatabase database = wordDbHelper.getWritableDatabase();
switch (match) {
case WORDS:
return database.delete(WordEntry.TABLE_NAME, selection, selectionArgs);
case WORD_ID:
long wordId = ContentUris.parseId(uri);
selection = WordEntry._ID + "=?";
selectionArgs = new String[] {String.valueOf(wordId)};
return database.delete(WordEntry.TABLE_NAME, selection, selectionArgs);
default:
throw new IllegalArgumentException("Delete is not supported for " + uri);
}
}
@Override
public int update(@NonNull Uri uri, @Nullable ContentValues values, @Nullable String selection, @Nullable String[] selectionArgs) {
int match = sUriMatcher.match(uri);
switch (match) {
case WORDS:
return updateWord(uri, values, selection, selectionArgs);
case WORD_ID:
long wordId = ContentUris.parseId(uri);
selection = WordEntry._ID + "=?";
selectionArgs = new String[] {String.valueOf(wordId)};
return updateWord(uri, values, selection, selectionArgs);
default:
throw new IllegalArgumentException("Update is not supported for " + uri);
}
}
private Uri insertWord(Uri uri, ContentValues values) {
if (values.containsKey(WordEntry.COLUMN_NAME_CIRCASSIAN)) {
String circassian = values.getAsString(WordEntry.COLUMN_NAME_TURKISH);
if (circassian == null) {
throw new IllegalArgumentException("Word requires circassian translation");
}
}
if (values.containsKey(WordEntry.COLUMN_NAME_TURKISH)) {
String turkish = values.getAsString(WordEntry.COLUMN_NAME_TURKISH);
if (turkish == null) {
throw new IllegalArgumentException("Word requires turkish translation");
}
}
if (values.size() > 0) {
return null;
}
SQLiteDatabase database = wordDbHelper.getWritableDatabase();
long idOfNewlyInserted = database.insert(WordEntry.TABLE_NAME, null, values);
if (idOfNewlyInserted == -1) {
Log.e(LOG_TAG, "Failed to insert row for: " + uri);
return null;
}
return ContentUris.withAppendedId(BASE_CONTENT_URI, idOfNewlyInserted);
}
private int updateWord(Uri uri, ContentValues values,
String selection, String[] selectionArgs) {
if (values.containsKey(WordEntry.COLUMN_NAME_CIRCASSIAN)) {
String circassian = values.getAsString(WordEntry.COLUMN_NAME_CIRCASSIAN);
if (circassian == null) {
throw new IllegalArgumentException("Circassian translation required ");
}
}
if (values.containsKey(WordEntry.COLUMN_NAME_TURKISH)) {
String turkish = values.getAsString(WordEntry.COLUMN_NAME_TURKISH);
if (turkish == null) {
throw new IllegalArgumentException("Turkish translation required");
}
}
if (values.size() < 0) {
return 0;
}
SQLiteDatabase database = wordDbHelper.getWritableDatabase();
return database.update(WordEntry.TABLE_NAME, values, selection, selectionArgs);
}
}
我已将CONTENT_AUTHORITY字符串更改为
com.tur_cirdictionary.turkish_circassiandictionary
使其与包名相同。这解决了这个问题。