I have a ContentProvider access problem that I've distilled down into a small test driver.
The provider manifest declares it with:
<provider
android:name=".MyContentProvider"
android:authorities="com.foo.provider"
android:enabled="true"
android:exported="true">
</provider>
My content provider class is lifted from an example from here:
package com.foo.alpha;
import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteQueryBuilder;
import android.net.Uri;
import java.util.HashMap;
public class MyContentProvider extends ContentProvider {
// defining authority so that other application can access it
static final String PROVIDER_NAME = "com.foo.provider";
// defining content URI
static final String URL = "content://" + PROVIDER_NAME + "/keys";
// parsing the content URI
static final Uri CONTENT_URI = Uri.parse(URL);
static final int uriCode = 1;
static final UriMatcher uriMatcher;
private static HashMap<String, String> values;
static {
// to match the content URI
// every time user access table under content provider
uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
// to access whole table
uriMatcher.addURI(PROVIDER_NAME, "keys", uriCode);
// to access a particular row
// uriMatcher.addURI(PROVIDER_NAME, "keys/*", uriCode);
}
public MyContentProvider() {
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
int count = 0;
switch (uriMatcher.match(uri)) {
case uriCode:
count = db.delete(TABLE_NAME, selection, selectionArgs);
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
getContext().getContentResolver().notifyChange(uri, null);
return count;
}
@Override
public String getType(Uri uri) {
// TODO: Implement this to handle requests for the MIME type of the data
// at the given URI.
switch (uriMatcher.match(uri)) {
case uriCode:
return "com.foo.provider/keys";
default:
throw new IllegalArgumentException("Unsupported URI: " + uri);
}
}
@Override
public Uri insert(Uri uri, ContentValues values) {
long rowID = db.insert(TABLE_NAME, "", values);
if (rowID > 0) {
Uri _uri = ContentUris.withAppendedId(CONTENT_URI, rowID);
getContext().getContentResolver().notifyChange(_uri, null);
return _uri;
}
throw new SQLiteException("Failed to add a record into " + uri);
}
@Override
public boolean onCreate() {
Context context = getContext();
DatabaseHelper dbHelper = new DatabaseHelper(context);
db = dbHelper.getWritableDatabase();
if (db != null) {
return true;
}
return false;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
qb.setTables(TABLE_NAME);
switch (uriMatcher.match(uri)) {
case uriCode:
qb.setProjectionMap(values);
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
Cursor c = qb.query(db, projection, selection, selectionArgs, null,
null, null);
c.setNotificationUri(getContext().getContentResolver(), uri);
return c;
}
@Override
public int update(Uri uri, ContentValues values, String selection,
String[] selectionArgs) {
int count = 0;
switch (uriMatcher.match(uri)) {
case uriCode:
count = db.update(TABLE_NAME, values, selection, selectionArgs);
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
getContext().getContentResolver().notifyChange(uri, null);
return count;
}
// creating object of database
// to perform query
private SQLiteDatabase db;
// declaring name of the database
static final String DATABASE_NAME = "db";
// declaring table name of the database
static final String TABLE_NAME = "keys";
// declaring version of the database
static final int DATABASE_VERSION = 1;
// sql query to create the table
static final String CREATE_DB_TABLE = " CREATE TABLE " + TABLE_NAME
+ " (name TEXT PRIMARY KEY NOT NULL, keydata TEXT NOT NULL);";
// creating a database
private static class DatabaseHelper extends SQLiteOpenHelper {
// defining a constructor
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// creating a table in the database
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_DB_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// sql query to drop a table
// having similar name
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
onCreate(db);
}
}
}
I've inserted some dummy data into the database within the provider app with:
// stuff some data into our database
try {
ContentValues values = new ContentValues();
values.put("name", "gordon");
values.put("keydata", "foobar");
getContentResolver().insert(MyContentProvider.CONTENT_URI, values);
Log.d("gordon", "inserted record");
} catch (Exception e) {
Log.d("gordon", e.toString());
}
That all seems good. Now I have a separate test app trying to query data from the provider. Here's the relevant code from that guy:
String URL = "content://com.foo.provider/keys";
Uri uri = Uri.parse(URL);
String[] projection = new String[]{"name", "keydata"};
Cursor cursor = getContentResolver().query(uri, null, null, null, null);
Cursor is always null here. I suspect I'm just missing something simple but I don't know what I don't know.
UPDATE: I noticed this 1-liner in logcat when I try to access the content provider from the 2nd app:
AppsFilter: interaction: PackageSetting{e4410e4 com.foo.mysender/10346} -> PackageSetting{1e89e76 com.foo.alpha/10347} BLOCKED
I don't know why it's blocked.
Turns out the issue was package visibility.
I stumbled onto this which lead to this addition in my manifest:
<queries>
<package android:name="com.foo.alpha" />
</queries>
Then it worked.