[英]How can I get only jpg or png images from cursor
我只想要带有特定扩展名的光标图像。 如果我像这样写一个游标查询,那么它会给我最后添加的图像。 例如,如果我使用 jpg 图像,那么它将提供 .jpg 图像路径。 如果我添加 .png 扩展名,那么它将提供一个 .png 图像路径
Cursor cur = getContentResolver().query(Images, PROJECTION_BUCKET, "1) GROUP BY 1,(2", null,
"MAX(datetaken) DESC");
但是如何从光标获取图像文件的特定扩展名。 我试过这段代码,但给了我一个错误:
String[] PROJECTION_BUCKET = new String[] { "bucket_id", "bucket_display_name", "datetaken", "_data" };
Uri Images = Media.EXTERNAL_CONTENT_URI;
String where = MediaStore.Images.Media.MIME_TYPE + "='image/jpeg'" +
" OR " + MediaStore.Images.Media.MIME_TYPE + "='image/png’"+
" OR " + MediaStore.Images.Media.MIME_TYPE + "='image/jpg’";
Cursor cur = getContentResolver().query(Images, PROJECTION_BUCKET where,null,MediaStore.Images.ImageColumns.DATE_TAKEN + " DESC");
错误:
11-06 18:15:10.249: E/SQLiteLog(3167): (1) near "image": syntax error
11-06 18:15:10.249: E/DatabaseUtils(3167): Writing exception to parcel
11-06 18:15:10.249: E/DatabaseUtils(3167): android.database.sqlite.SQLiteException: near "image": syntax error (code 1): , while compiling: SELECT bucket_id, bucket_display_name, datetaken, _data FROM images WHERE (mime_type='image/jpeg' OR mime_type='image/png’ OR mime_type='image/jpg’) ORDER BY datetaken DESC
11-06 18:15:10.249: E/DatabaseUtils(3167): at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
11-06 18:15:10.249: E/DatabaseUtils(3167): at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
11-06 18:15:10.249: E/DatabaseUtils(3167): at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
11-06 18:15:10.249: E/DatabaseUtils(3167): at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
11-06 18:15:10.249: E/DatabaseUtils(3167): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
11-06 18:15:10.249: E/DatabaseUtils(3167): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
11-06 18:15:10.249: E/DatabaseUtils(3167): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
11-06 18:15:10.249: E/DatabaseUtils(3167): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1316)
11-06 18:15:10.249: E/DatabaseUtils(3167): at android.database.sqlite.SQLiteQueryBuilder.query(SQLiteQueryBuilder.java:400)
11-06 18:15:10.249: E/DatabaseUtils(3167): at android.database.sqlite.SQLiteQueryBuilder.query(SQLiteQueryBuilder.java:333)
11-06 18:15:10.249: E/DatabaseUtils(3167): at com.android.providers.media.MediaProvider.query(MediaProvider.java:2700)
11-06 18:15:10.249: E/DatabaseUtils(3167): at android.content.ContentProvider.query(ContentProvider.java:1010)
11-06 18:15:10.249: E/DatabaseUtils(3167): at android.content.ContentProvider$Transport.query(ContentProvider.java:214)
11-06 18:15:10.249: E/DatabaseUtils(3167): at android.content.ContentProviderNative.onTransact(ContentProviderNative.java:112)
11-06 18:15:10.249: E/DatabaseUtils(3167): at android.os.Binder.execTransact(Binder.java:446)
有人知道如何为此编写查询吗?
正确的查询在下面我找到了我自己的问题的解决方案
String where = MediaStore.Images.Media.MIME_TYPE + "='image/jpeg'" + " OR " + MediaStore.Images.Media.MIME_TYPE + "='image/png'"+ " OR " + MediaStore.Images.Media.MIME_TYPE + "='image/jpg'";
我在我的问题代码中只犯了一个错误,错误是我在“png”和“jpg”的末尾写了“this”,我只是将“this替换为”而已
对于仍在研究此问题的任何人,这是解决方案:
private String[] thumbColumns = {MediaStore.Images.Thumbnails.DATA, MediaStore.Images.Thumbnails.IMAGE_ID};
private String[] columns = {MediaStore.Images.Media._ID, MediaStore.Images.Media.DATA, MediaStore.Images.Media.DATE_TAKEN};
private String[] whereArgs = {"image/jpeg", "image/png", "image/jpg"};
String orderBy = MediaStore.Images.Media.DATE_TAKEN+ " DESC";
String where = MediaStore.Images.Media.MIME_TYPE + "=? or "
+ MediaStore.Images.Media.MIME_TYPE + "=? or "
+ MediaStore.Images.Media.MIME_TYPE + "=?";
Cursor cursor = getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns, where, whereArgs, orderBy);
private fun getLocalPhotos(contentResolver: ContentResolver): ArrayList<Uri> {
val projection = arrayOf(MediaStore.Images.Media._ID)
val selection = (MediaStore.Images.Media.MIME_TYPE + "=? or "
+ MediaStore.Images.Media.MIME_TYPE + "=? or "
+ MediaStore.Images.Media.MIME_TYPE + "=?")
val selectionArgs = arrayOf("image/jpeg", "image/png", "image/jpg")
val sortOrder = "${MediaStore.Images.Media.DATE_MODIFIED} DESC"
val localPhotos = arrayListOf<Uri>()
contentResolver.query(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
projection,
selection,
selectionArgs,
sortOrder
)?.use { cursor ->
while (cursor.moveToNext()) {
val index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media._ID)
val id = cursor.getLong(index)
val contentUri = ContentUris.withAppendedId(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
id
)
localPhotos.add(contentUri)
}
}
return localPhotos
}
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