A library to eliminate boilerplate when querying ContentResolver and
SQLiteDatabase.
Add the following dependency to your Gradle config:
dependencies {
compile 'com.evernote:android-fetch:0.1.0'
}In its simplest form, the library enables this:
Cursor cursor;
List<String> result = new ArrayList<>();
try {
cursor = contentResolver.query(sourceUri, null, null, null, null);
while (cursor != null && cursor.moveToNext()) {
result.add(cursor.getString(0));
}
} finally {
if (cursor != null) {
cursor.close();
}
}To become this:
List<String> result = QueryBuilder.cr(sourceUri)
.fetch(contentResolver).toList(Converter.STRING);Every parameter of query can be specified by calling additional optional
methods, and you can use a custom Converter to build your own objects:
List<Thing> things = QueryBuilder.db("my_table")
.projection("id", "name", "description")
.selection("size = ?")
.selectionArgs("42")
.sortOrder("name")
.fetch(database)
.toList(new Converter<Thing>() {
@Override
public Thing convert(Cursor c) {
int id = c.getInt(0);
String name = c.getString(1);
String description = c.getString(2);
return new Thing(id, name, description);
}
});There are also convenience methods for filters on list of values:
QueryBuilder.cr(sourceUri).select("name", nameList);is equivalent to:
contentResolver.query(sourceUri, null,
"name in (?,?,?)",
nameList.toArray(new String[nameList.size()]),
null);
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