试图从我的活动菜单选项中设置按钮在recyclerview中不可见，但是它没有做任何事情，我已经在recyclerview适配器中创建了一个方法，并且在bindviewholder上我设置了if语句来更改可见性。本活动以您调用方法的方式进行设置。我想念什么？谢谢
public class PostRecyclerAdapter extendsRecyclerView.Adapter<PostRecyclerAdapter.ViewHolder> {
private boolean activate = false;
public PostRecyclerAdapter(Context context, List<Post> blogList) {
this.context = context;
this.postList = blogList;
}
public PostRecyclerAdapter() {
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
final int itemPos = position;
final Post post = postList.get(position);
holder.title.setText(post.getTitle());
holder.desc.setText(post.getDesc());
holder.category.setText(post.getTag());
holder.edit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
editClassifiedAd(post.getPostId());
}
});
holder.delete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
deleteClassifiedAd(post.getPostId(), itemPos);
}
});
if (activate) {
holder.edit.setVisibility(View.VISIBLE);
holder.delete.setVisibility(View.VISIBLE);
} else {
holder.edit.setVisibility(View.INVISIBLE);
holder.delete.setVisibility(View.INVISIBLE);
}
}
public void activateButtons(boolean activate) {
this.activate = activate;
notifyDataSetChanged();
}
PostListActivity.java
public class PostListActivity extends AppCompatActivity{
PostRecyclerAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_post_list);
postListFrgmt();
mAdapter = new PostRecyclerAdapter();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main_menu, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.edit:
if(item.isChecked()){
// If item already checked then unchecked it
item.setChecked(false);
mAdapter.activateButtons(true);
}else{
// If item is unchecked then checked it
item.setChecked(true);
mAdapter.activateButtons(false);
}
return true;
default:
return super.onOptionsItemSelected(item);
}
return super.onOptionsItemSelected(item);
}
答案 0 :(得分：0)
在PostListActivity中，您实际上没有将适配器设置为RecyclerView。 您需要添加您的recyclerview，为其提供LayoutManager（线性或其他），然后再将适配器传递给它。例如
if (os.getenv"os" or ""):match"^Windows" then
local char, byte, table_insert, table_concat = string.char, string.byte, table.insert, table.concat
-- TABLES OF CODEPAGES
local cp1253 = { -- GREEK
[0x20AC] = 0x80, -- EURO SIGN
[0x201A] = 0x82, -- SINGLE LOW-9 QUOTATION MARK
[0x0192] = 0x83, -- LATIN SMALL LETTER F WITH HOOK
[0x201E] = 0x84, -- DOUBLE LOW-9 QUOTATION MARK
[0x2026] = 0x85, -- HORIZONTAL ELLIPSIS
[0x2020] = 0x86, -- DAGGER
[0x2021] = 0x87, -- DOUBLE DAGGER
[0x2030] = 0x89, -- PER MILLE SIGN
[0x2039] = 0x8B, -- SINGLE LEFT-POINTING ANGLE QUOTATION MARK
[0x2018] = 0x91, -- LEFT SINGLE QUOTATION MARK
[0x2019] = 0x92, -- RIGHT SINGLE QUOTATION MARK
[0x201C] = 0x93, -- LEFT DOUBLE QUOTATION MARK
[0x201D] = 0x94, -- RIGHT DOUBLE QUOTATION MARK
[0x2022] = 0x95, -- BULLET
[0x2013] = 0x96, -- EN DASH
[0x2014] = 0x97, -- EM DASH
[0x2122] = 0x99, -- TRADE MARK SIGN
[0x203A] = 0x9B, -- SINGLE RIGHT-POINTING ANGLE QUOTATION MARK
[0x00A0] = 0xA0, -- NO-BREAK SPACE
[0x0385] = 0xA1, -- GREEK DIALYTIKA TONOS
[0x0386] = 0xA2, -- GREEK CAPITAL LETTER ALPHA WITH TONOS
[0x00A3] = 0xA3, -- POUND SIGN
[0x00A4] = 0xA4, -- CURRENCY SIGN
[0x00A5] = 0xA5, -- YEN SIGN
[0x00A6] = 0xA6, -- BROKEN BAR
[0x00A7] = 0xA7, -- SECTION SIGN
[0x00A8] = 0xA8, -- DIAERESIS
[0x00A9] = 0xA9, -- COPYRIGHT SIGN
[0x00AB] = 0xAB, -- LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
[0x00AC] = 0xAC, -- NOT SIGN
[0x00AD] = 0xAD, -- SOFT HYPHEN
[0x00AE] = 0xAE, -- REGISTERED SIGN
[0x2015] = 0xAF, -- HORIZONTAL BAR
[0x00B0] = 0xB0, -- DEGREE SIGN
[0x00B1] = 0xB1, -- PLUS-MINUS SIGN
[0x00B2] = 0xB2, -- SUPERSCRIPT TWO
[0x00B3] = 0xB3, -- SUPERSCRIPT THREE
[0x0384] = 0xB4, -- GREEK TONOS
[0x00B5] = 0xB5, -- MICRO SIGN
[0x00B6] = 0xB6, -- PILCROW SIGN
[0x00B7] = 0xB7, -- MIDDLE DOT
[0x0388] = 0xB8, -- GREEK CAPITAL LETTER EPSILON WITH TONOS
[0x0389] = 0xB9, -- GREEK CAPITAL LETTER ETA WITH TONOS
[0x038A] = 0xBA, -- GREEK CAPITAL LETTER IOTA WITH TONOS
[0x00BB] = 0xBB, -- RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
[0x038C] = 0xBC, -- GREEK CAPITAL LETTER OMICRON WITH TONOS
[0x00BD] = 0xBD, -- VULGAR FRACTION ONE HALF
[0x038E] = 0xBE, -- GREEK CAPITAL LETTER UPSILON WITH TONOS
[0x038F] = 0xBF, -- GREEK CAPITAL LETTER OMEGA WITH TONOS
[0x0390] = 0xC0, -- GREEK SMALL LETTER IOTA WITH DIALYTIKA AND TONOS
[0x0391] = 0xC1, -- GREEK CAPITAL LETTER ALPHA
[0x0392] = 0xC2, -- GREEK CAPITAL LETTER BETA
[0x0393] = 0xC3, -- GREEK CAPITAL LETTER GAMMA
[0x0394] = 0xC4, -- GREEK CAPITAL LETTER DELTA
[0x0395] = 0xC5, -- GREEK CAPITAL LETTER EPSILON
[0x0396] = 0xC6, -- GREEK CAPITAL LETTER ZETA
[0x0397] = 0xC7, -- GREEK CAPITAL LETTER ETA
[0x0398] = 0xC8, -- GREEK CAPITAL LETTER THETA
[0x0399] = 0xC9, -- GREEK CAPITAL LETTER IOTA
[0x039A] = 0xCA, -- GREEK CAPITAL LETTER KAPPA
[0x039B] = 0xCB, -- GREEK CAPITAL LETTER LAMDA
[0x039C] = 0xCC, -- GREEK CAPITAL LETTER MU
[0x039D] = 0xCD, -- GREEK CAPITAL LETTER NU
[0x039E] = 0xCE, -- GREEK CAPITAL LETTER XI
[0x039F] = 0xCF, -- GREEK CAPITAL LETTER OMICRON
[0x03A0] = 0xD0, -- GREEK CAPITAL LETTER PI
[0x03A1] = 0xD1, -- GREEK CAPITAL LETTER RHO
[0x03A3] = 0xD3, -- GREEK CAPITAL LETTER SIGMA
[0x03A4] = 0xD4, -- GREEK CAPITAL LETTER TAU
[0x03A5] = 0xD5, -- GREEK CAPITAL LETTER UPSILON
[0x03A6] = 0xD6, -- GREEK CAPITAL LETTER PHI
[0x03A7] = 0xD7, -- GREEK CAPITAL LETTER CHI
[0x03A8] = 0xD8, -- GREEK CAPITAL LETTER PSI
[0x03A9] = 0xD9, -- GREEK CAPITAL LETTER OMEGA
[0x03AA] = 0xDA, -- GREEK CAPITAL LETTER IOTA WITH DIALYTIKA
[0x03AB] = 0xDB, -- GREEK CAPITAL LETTER UPSILON WITH DIALYTIKA
[0x03AC] = 0xDC, -- GREEK SMALL LETTER ALPHA WITH TONOS
[0x03AD] = 0xDD, -- GREEK SMALL LETTER EPSILON WITH TONOS
[0x03AE] = 0xDE, -- GREEK SMALL LETTER ETA WITH TONOS
[0x03AF] = 0xDF, -- GREEK SMALL LETTER IOTA WITH TONOS
[0x03B0] = 0xE0, -- GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND TONOS
[0x03B1] = 0xE1, -- GREEK SMALL LETTER ALPHA
[0x03B2] = 0xE2, -- GREEK SMALL LETTER BETA
[0x03B3] = 0xE3, -- GREEK SMALL LETTER GAMMA
[0x03B4] = 0xE4, -- GREEK SMALL LETTER DELTA
[0x03B5] = 0xE5, -- GREEK SMALL LETTER EPSILON
[0x03B6] = 0xE6, -- GREEK SMALL LETTER ZETA
[0x03B7] = 0xE7, -- GREEK SMALL LETTER ETA
[0x03B8] = 0xE8, -- GREEK SMALL LETTER THETA
[0x03B9] = 0xE9, -- GREEK SMALL LETTER IOTA
[0x03BA] = 0xEA, -- GREEK SMALL LETTER KAPPA
[0x03BB] = 0xEB, -- GREEK SMALL LETTER LAMDA
[0x03BC] = 0xEC, -- GREEK SMALL LETTER MU
[0x03BD] = 0xED, -- GREEK SMALL LETTER NU
[0x03BE] = 0xEE, -- GREEK SMALL LETTER XI
[0x03BF] = 0xEF, -- GREEK SMALL LETTER OMICRON
[0x03C0] = 0xF0, -- GREEK SMALL LETTER PI
[0x03C1] = 0xF1, -- GREEK SMALL LETTER RHO
[0x03C2] = 0xF2, -- GREEK SMALL LETTER FINAL SIGMA
[0x03C3] = 0xF3, -- GREEK SMALL LETTER SIGMA
[0x03C4] = 0xF4, -- GREEK SMALL LETTER TAU
[0x03C5] = 0xF5, -- GREEK SMALL LETTER UPSILON
[0x03C6] = 0xF6, -- GREEK SMALL LETTER PHI
[0x03C7] = 0xF7, -- GREEK SMALL LETTER CHI
[0x03C8] = 0xF8, -- GREEK SMALL LETTER PSI
[0x03C9] = 0xF9, -- GREEK SMALL LETTER OMEGA
[0x03CA] = 0xFA, -- GREEK SMALL LETTER IOTA WITH DIALYTIKA
[0x03CB] = 0xFB, -- GREEK SMALL LETTER UPSILON WITH DIALYTIKA
[0x03CC] = 0xFC, -- GREEK SMALL LETTER OMICRON WITH TONOS
[0x03CD] = 0xFD, -- GREEK SMALL LETTER UPSILON WITH TONOS
[0x03CE] = 0xFE, -- GREEK SMALL LETTER OMEGA WITH TONOS
}
local locale = tonumber(string.match(os.setlocale(), "(%d+)$"))
local CODEPAGE
-- Use appropriate locale
if locale == 1253 then -- GREEK
CODEPAGE = cp1253
elseif locale == 1254 then -- TURKISH
CODEPAGE = cp1254
elseif locale == 1255 then -- HEBREW
CODEPAGE = cp1255
-- etc
end
local function utf8_to_unicode(utf8str, pos)
-- pos = starting byte position inside input string (default 1)
pos = pos or 1
local code, size = byte(utf8str, pos), 1
if code >= 0xC0 and code < 0xFE then
local mask = 64
code = code - 128
repeat
local next_byte = byte(utf8str, pos + size) or 0
if next_byte >= 0x80 and next_byte < 0xC0 then
code, size = (code - mask - 2) * 64 + next_byte, size + 1
else
code, size = byte(utf8str, pos), 1
end
mask = mask * 32
until code < mask
end
-- returns code, number of bytes in this utf8 char
return code, size
end
local function utf8_to_codepage(utf8str)
local pos, result_codepage = 1, {}
while pos <= #utf8str do
local code, size = utf8_to_unicode(utf8str, pos)
pos = pos + size
code = code < 128 and code or CODEPAGE[code] or byte('?')
table_insert(result_codepage, char(code))
end
return table_concat(result_codepage)
end
local orig_os_rename = os.rename
function os.rename(old, new)
return orig_os_rename(utf8_to_codepage(old), utf8_to_codepage(new))
end
local orig_os_remove = os.remove
function os.remove(filename)
return orig_os_remove(utf8_to_codepage(filename))
end
local orig_os_execute = os.execute
function os.execute(command)
if command then
command = utf8_to_codepage(command)
end
return orig_os_execute(command)
end
local orig_io_open = io.open
function io.open(filename, ...)
return orig_io_open(utf8_to_codepage(filename), ...)
end
local orig_io_popen = io.popen
function io.popen(prog, ...)
return orig_io_popen(utf8_to_codepage(prog), ...)
end
local orig_io_lines = io.lines
function io.lines(filename, ...)
if filename then
filename = utf8_to_codepage(filename)
end
return orig_io_lines(filename, ...)
end
end