我有两个内容提供商的基于应用程序A和B都拥有自己的内容提供商,并设置为从A和B读取数据,反之亦然。当其他应用程序处于后台时,一切正常。但是,如果应用程序在后台被杀害或不存在,则无法找到另一个内容提供者。例如,应用程序B想要从应用程序A读取数据。如果'A'在后台运行,'B'可以成功读取'A'的数据,但如果'A'未运行,则发生致命错误(找不到匹配uri)在背景中。从自定义内容提供商访问数据
有什么想法?
[编辑] 我得到了相同的问题this post。 我在这两个应用程序清单已经这样:
<provider
android:name="MyContentProvider"
android:authorities="com.example.${applicationId}-provider"
android:enabled="true"
android:exported="true"
android:grantUriPermissions="true">
</provider>
这我得到的错误:
写例外包裹 java.lang.IllegalArgumentException异常:不支持的URI(查询):内容://com.example.appA-provider/appA at android.content.example.provider.MyContentProvider.query(MyContentProvider.java:142) at android.content.ContentProvider.query(ContentProvider.java:1007) at android。 content.ContentPro vider $ Transport.query(ContentProvider.java:218) 在android.content.ContentProviderNative.onTransact(ContentProviderNative.java:112) 在android.os.Binder.execTransact(Binder.java:461)
注意:这只发生在另一个应用程序不在后台时,否则它按预期工作(可以很好地读取彼此的数据)。
[编辑2] 这里的代码MyContentProvider:
package com.example.provider;
import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteQueryBuilder;
import android.net.Uri;
public class MyContentProvider extends ContentProvider {
private static DatabaseHelper dbHelper;
private static final int ALL_ENTRIES = 1;
private static final int SINGLE_ENTRY = 2;
private String mAuthority = BuildConfig.APPLICATION_ID;
private static UriMatcher uriMatcher;
public Uri CONTENT_URI= null;
static {
uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
}
public MyContentProvider() {}
public void init(String packageName, String authority) {
if (authority == null) {
setAuthority(packageName, true);
} else {
setAuthority(authority, false);
}
uriMatcher.addURI(getAuthority(), TABLE_NAME, ALL_ENTRIES);
uriMatcher.addURI(getAuthority(), TABLE_NAME + "/#", SINGLE_ENTRY);
CONTENT_URI =
Uri.parse("content://" + getAuthority() + "/" + TABLE_NAME);
}
private void setAuthority(String packageName, boolean isPackageName) {
if (isPackageName) {
mAuthority = packageName + ".myprovider";
} else {
mAuthority = packageName;
}
}
public String getAuthority() {
return mAuthority;
}
public Uri getContentUri() {
return CONTENT_URI;
}
@Override
public boolean onCreate() {
dbHelper = new DatabaseHelper(getContext());
return false;
}
//Return the MIME type corresponding to a content URI
@Override
public String getType(Uri uri) {
if (uri == null) {
throw new IllegalArgumentException("Content uri is null: " + uri);
}
if (uriMatcher == null) {
throw new IllegalArgumentException("Unsupported Match URI: " + uri);
}
switch (uriMatcher.match(uri)) {
case ALL_ENTRIES:
return "vnd.android.cursor.dir/vnd." + getAuthority() + "." + TABLE_NAME;
case SINGLE_ENTRY:
return "vnd.android.cursor.item/vnd." + getAuthority() + "." + TABLE_NAME;
default:
throw new IllegalArgumentException("Unsupported URI: " + uri);
}
}
@Override
public Uri insert(Uri uri, ContentValues values) {
Uri _uri = null;
long id = 0;
SQLiteDatabase db = dbHelper.getWritableDatabase();
switch (uriMatcher.match(uri)) {
case ALL_ENTRIES:
case SINGLE_ENTRY:
id = db.insert(TABLE_NAME, null, values);
getContext().getContentResolver().notifyChange(uri, null);
_uri = Uri.parse(CONTENT_URI + "/" + id);
break;
default:
throw new IllegalArgumentException("Unsupported URI (insert): " + uri);
}
return _uri;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
SQLiteDatabase db = dbHelper.getWritableDatabase();
SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
Cursor cursor = null;
String id = null;
switch (uriMatcher.match(uri)) {
case ALL_ENTRIES:
queryBuilder.setTables(TABLE_NAME);
cursor = queryBuilder.query(db, projection, selection,
selectionArgs, null, null, sortOrder);
break;
case SINGLE_ENTRY:
queryBuilder.setTables(TABLE_NAME);
id = uri.getPathSegments().get(1);
if (id != null && !id.isEmpty()) {
queryBuilder.appendWhere(TABLE_NAME + "=" + id);
}
cursor = queryBuilder.query(db, projection, selection,
selectionArgs, null, null, sortOrder);
break;
default:
throw new IllegalArgumentException("Unsupported URI(Query): " + uri);
}
return cursor;
}
}
'匹配uri not foun d'没有说什么,发布你的代码和完整的堆栈跟踪 – pskink
检查两个清单标签并考虑将内容提供者代码放入库中? –
Pomagranite
@Pomagranite:我已经把代码放在上面了。是的,我使用内容提供商代码作为库。 –
bianca