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我有一個庫項目,爲許多應用程序提供基本代碼,這些應用程序都需要相同的數據庫結構和功能,我正在尋找實現此目的的最佳方法。 我主要關心的是如何提供非靜態權限,以便可以使用使用該庫的應用程序的包名稱覆蓋它。Android,圖書館項目中的內容提供商
所以在庫項目我想我可以改變以下常量靜態方法將接受一個方面,讓我擺脫資源字符串或從context.getPackageName方法
庫的權限項目模型
public static final class Questions implements BaseColumns {
// public static final Uri CONTENT_URI =
// Uri.parse("content://" + Config.AUTHORITY + "/questions");
// use getAuthority instead which in turn will just get the package ae. Will this work?
public static Uri getContentUri(Context c){
return Uri.parse("content://" + getAuthority(c) + "/questions");
}
...
}
public static String getAuthority(Context c){
return c.getPackageName + ".QuizProvider";
}
庫項目內容提供商
public class QuizProvider extends ContentProvider {
// private SQLiteDatabase mDB;
private static final String TAG = "MyLog";
private static final String DATABASE_NAME = "quiz.db";
private static final int DATABASE_VERSION = 1;
private static final int QUESTIONS = 1;
private static final int QUESTION_ID = 2;
private static final UriMatcher URI_MATCHER = new UriMatcher(
UriMatcher.NO_MATCH);
private static Map<String, String> QUESTION_LIST_PROJECTION_MAP = null;
private DatabaseHelper mOpenHelper;
/**
* This class helps open, create, and upgrade the database file.
*/
private static class DatabaseHelper extends SQLiteOpenHelper {
@Override
public Uri insert(Uri uri, ContentValues values) {
int match = URI_MATCHER.match(uri);
switch (match) {
case QUESTIONS:
return insertQuestion(values);
...
}
...
@Override
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
switch (URI_MATCHER.match(uri)) {
case QUESTIONS:
qb.setTables(QuizModel.Questions.TABLE_NAME);
qb.setProjectionMap(QUESTION_LIST_PROJECTION_MAP);
break;
...
}
//How do I change this?
static {
URI_MATCHER.addURI(Config.AUTHORITY, QuizModel.Questions.TABLE_NAME, QUESTIONS);
...
QUESTION_LIST_PROJECTION_MAP = new HashMap<String, String>();
...
}
1)我真的不明白爲static c {URI_MATCHER.addUR}聲明,我正在努力理解如何將其轉換?
2)這是否能夠在任何應用程序中重用整個功能的最佳方法?如果不是,會更好?
對於那些正在尋找相同的問題,是的,你可以在這個[Stackoverflow評論](http://stackoverflow.com/questions/16268119/dynamically-set-the-authority-of-a- ContentProvider的#comment23303216_16270100)。 – Sufian 2017-05-11 13:34:38