更改android中textView的可见性

Question

我正在使用一个包含2个textViews的列表视图。1 textView的可见性在XML中设置为GONE。当一个列表项被点击时，我希望它的文本视图是可见的。当它再次被点击时，我希望它消失。更糟糕的是，当在listView中单击任何其他项目时，只有它的textView才可见。我正在用下面的代码进行尝试，但当再次选择相同的列表项时，Textview并没有变为GONE。

lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//to change the visibility of Prevoiusly selected textview to GONE
if (pwdView != null)
pwdView.setVisibility(View.GONE);
pwdView = (TextView) view.findViewById(R.id.saved_pwd);
if (pwdView.getVisibility()==View.VISIBLE)
pwdView.setVisibility(View.GONE);
else
pwdView.setVisibility(View.VISIBLE);
}
});

适配器代码：

public class PwdCursorAdaptor extends CursorAdapter {
public PwdCursorAdaptor(Context context, Cursor c) {
super(context, c, 0);
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
return LayoutInflater.from(context).inflate(R.layout.list_items, parent, false);
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
TextView saved_id = (TextView) view.findViewById(R.id.saved_id);
TextView saved_password_data=(TextView)view.findViewById(R.id.saved_pwd);
int pass_index=cursor.getColumnIndex(PwdContract.PasswordEntry.COL_PASSSWORD);
int id_index = cursor.getColumnIndex(PwdContract.PasswordEntry.COL_LOGIN_ID);
saved_id.setText(cursor.getString(id_index));
saved_password_data.setText(cursor.getString(pass_index));
}

}

Answer 1

lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) 
{
TextView  pwdView = (TextView) view.findViewById(R.id.saved_pwd);
if (pwdView !=null)
{
pwdView.setVisibility(pwdView.getVisibility()==View.VISIBLE ? View.GONE : View.VISIBLE);
}
notifyDatasetChanged();
}
});`

Answer 2

这是因为点击监听器是异步调用。因此，您必须通知适配器数据项发生了更改。

lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (pwdView != null)
pwdView.setVisibility(View.GONE);
pwdView = (TextView) view.findViewById(R.id.saved_pwd);
if (pwdView.getVisibility()==View.VISIBLE)
pwdView.setVisibility(View.GONE);
else
pwdView.setVisibility(View.VISIBLE);

yourAdapter.notifyDataSetChanged();
}
});`

Answer 3

就像在适配器类中一样

@Override
public void bindView(View view, Context context, Cursor cursor) {
TextView saved_id = (TextView) view.findViewById(R.id.saved_id);
final TextView saved_password_data=(TextView)view.findViewById(R.id.saved_pwd);
int pass_index=cursor.getColumnIndex(PwdContract.PasswordEntry.COL_PASSSWORD);
int id_index = cursor.getColumnIndex(PwdContract.PasswordEntry.COL_LOGIN_ID);
saved_id.setText(cursor.getString(id_index));
saved_password_data.setText(cursor.getString(pass_index));
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (saved_password_data.getVisibility()==View.VISIBLE) {
saved_password_data.setVisibility(View.GONE);
}else {
saved_password_data.setVisibility(View.VISIBLE);
}
notifyDatasetChanged();
}
});
}

如果您希望saved_password_data第一次应该可见或消失，请根据需要将可见性放在XML文件中

Answer 4

将此添加到onItemClick中，此处lBooking.size()是列表大小。

@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
for(int j=0;j<lBooking.size();j++){
if(i == j){
view.findViewById(R.id.saved_pwd).setVisibility(View.VISIBLE);
}else {
lv.getChildAt(j).findViewById(R.id.saved_pwd).setVisibility(View.GONE);
}
}
}