java - fragments not displaying in framelayout -
intro:
to put things perspective, attempting use fragments create sudoku game.
the sudoku board consists of 9 sub-grids, each containing 9 cells, 9 cells in 1 grid, , 9 of these grids form sudoku board, arranged in 3x3 fashion.
method:
home screen containing information, of gridlayout contains 9 framelayouts each sudoku fragment placed into
the 9 sudoku fragments make sudoku board.
sudoku_cell extends linearlayout onclicklistener, since extending textview, unable inflate sudoku_cell layout (is possible so?)
in main activity, have gridlayout containing 9 framelayouts. these layouts have column , row locations set form 3x3 matrix, each of fragments added into.
these framelayouts named on 0-based index: frame00, frame01, frame02, frame10, etc
documentation says:
as mentioned here on developer.android.com, required have an:
- inflator method fragment, i.e.
oncreateview()inflates fragment - a
layoutcontainer of sorts root/place fragment in, in main activity (in case) - a
fragmentmanager,fragmenttransactionmanagerhandle fragments, adding , commiting them.
problem:
tl;dr: simply, fragments not showing.
after calling commit(), expect see 3x3 board of sudoku_grid fragments, each containing 9 sudoku_cells. however, not shown
i have searched so, reread documentation, , searched more cannot understand why not showing.
i have tried:
when inflating fragment, inflate sudoku_cell layout instead, infact show 9 cell grid.
however each cell should grid containing 9 cells, leads me believe there may issue on sudoku_grid - sudoku_cell side, possibly sudoku_cell layout not being inflated correctly or being rooted correctly.
usually layoutinflator, , viewgroup passed allowing 1 inflate layout, in case of sudoku_cell, cannot find such method override, cause?
the code:
sudoku_cell.xml
<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <textview android:id="@+id/celltext" android:layout_width="35dp" android:layout_margin="1px" android:textsize="18dp" android:layout_height="35dp" android:textalignment="center" android:textcolor="@color/clblack"> </textview> </linearlayout> sudokucell.java
public class sudokucell extends linearlayout{ private linearlayout layout; private textview textview; private context mcontext; private point location; private int index; public sudokucell(context context) { super(context); } public sudokucell(context context, attributeset attrs) { super(context, attrs); mcontext = context; layoutinflater inflater = (layoutinflater) getcontext().getsystemservice(context.layout_inflater_service); layout = (linearlayout) inflater.inflate(r.layout.sudoku_cell, this, true); textview = layout.findviewbyid(r.id.celltext); settext(""); } public void setstatictext(string s){ if (textview != null) { textview.settext(s); textview.settypeface(textview.gettypeface(), typeface.bold); } } public void settext(string s){ if (textview != null) textview.settext(s); } public point getlocation() { return location; } public void setlocation(point location) { this.location = location; } public int getindex() { return index; } public void setindex(int index) { this.index = index; } } 9 of these sudoku_cell's added sudoku_grid shown below in oncreateview() , populategrid() methods:
sudoku_grid.xml
<?xml version="1.0" encoding="utf-8"?> <gridlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="2px" android:id="@+id/grid_layout" android:columncount="3" android:rowcount="3"> </gridlayout> sudokugrid.java
public class sudokugrid extends fragment{ private gridlayout gridlayout; private list<gridfragmentlistener> listeners = new arraylist<>(); private context mactititycontext; private boolean fragment_location_centre; private float screen_dp; private int grid_margins_dp = 1; private int colorodd, coloreven; private list<integer> presetgrid; private view previousview; private drawable previousviewdrawable; public void addgridlistener(gridfragmentlistener gridfragmentlistener) { listeners.add(gridfragmentlistener); } public void removegridlistener(gridfragmentlistener gridfragmentlistener) { listeners.remove(gridfragmentlistener); } protected void notifyvaluechanged(view value) { (gridfragmentlistener listener : listeners) listener.onvaluechange(value); } @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) { mactititycontext = getactivity(); view v = inflater.inflate(r.layout.sudoku_grid, container, false); //set grid view gridlayout = v.findviewbyid(r.id.grid_layout); populategrid(); return v; } private void populategrid() { (int = 0; < 9; i++) { sudokucell sudokucell = new sudokucell(mactititycontext); sudokucell.setbackgroundcolor(((i % 2) == 0) ? r.color.clodd : r.color.cleven); system.out.printf("sudoku cell id [ index = " + string.valueof(i) + " ] - getid() = " + sudokucell.getid()); sudokucell.setlocation(getpoint(i)); sudokucell.setindex(i); sudokucell.setonclicklistener(new view.onclicklistener() { @override public void onclick(view view) { notifyvaluechanged(view); } }); sudokucell.setonfocuschangelistener(new view.onfocuschangelistener() { @override public void onfocuschange(view view, boolean b) { sudokucell cell = (sudokucell) view; if (b) view.setbackgroundcolor(contextcompat.getcolor(mactititycontext, r.color.clselected)); else view.setbackgroundcolor(contextcompat.getcolor(mactititycontext, (cell.getindex() % 2 == 0) ? r.color.clodd : r.color.cleven)); } }); sudokucell.setstatictext(string.valueof(i)); gridlayout.addview(sudokucell, i); } } private point getpoint(int i) { int y = 0; while (i > 2){ y++; -= 3; } return new point(i, y); } @override public void onstart() { super.onstart(); try { addgridlistener((gridfragmentlistener) getactivity()); } catch (classcastexception e) { throw new classcastexception( getactivity().getclass().tostring() + " not implement detailsfragment.detailsfragmentlistener interface."); } } @override public void onstop() { super.onstop(); removegridlistener((gridfragmentlistener) getactivity()); } } in main activity, handle creation of 9 sudoku_grid fragments placed each respective framelayout, form 3x3 matrix of sudoku_grids, form sudoku board
activity_main_sudoku.xml
<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="wrap302.nmu.task1.mainactivitysudoku" android:background="@color/cldarkgrey"> <linearlayout android:orientation="vertical" android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/linearlayout2"> <textview android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/textview" android:text="@string/app_title" android:layout_margintop="5dp" android:layout_marginbottom="5dp" android:textcolor="@color/clwhite" android:textappearance="@style/textappearance.appcompat.display1" android:textalignment="center" android:textstyle="bold" android:fontfamily="sans-serif"/> <textview android:text="@string/lblscore" android:textcolor="@color/clwhite" android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/lblscore" android:textappearance="@style/textappearance.appcompat.button" android:textalignment="center" android:layout_marginbottom="5dp"/> </linearlayout> <gridlayout android:layout_gravity="center" android:layout_width="match_parent" android:layout_height="match_parent" android:columncount="3" android:rowcount="3" android:id="@+id/main_sudokugrid_container"> <framelayout android:layout_column="0" android:layout_row="0" android:layout_width="wrap_content" android:background="@color/clwhite" android:layout_height="wrap_content" android:id="@+id/frame00"/> <framelayout android:layout_column="1" android:layout_row="0" android:layout_width="wrap_content" android:background="@color/clwhite" android:layout_height="wrap_content" android:id="@+id/frame01"/> <framelayout android:layout_column="2" android:layout_row="0" android:layout_width="wrap_content" android:background="@color/clwhite" android:layout_height="wrap_content" android:id="@+id/frame02"/> <framelayout android:layout_column="0" android:layout_row="1" android:layout_width="wrap_content" android:background="@color/clwhite" android:layout_height="wrap_content" android:id="@+id/frame10"/> <framelayout android:layout_column="1" android:layout_row="1" android:layout_width="wrap_content" android:background="@color/clwhite" android:layout_height="wrap_content" android:id="@+id/frame11"/> <framelayout android:layout_column="2" android:layout_row="1" android:layout_width="wrap_content" android:background="@color/clwhite" android:layout_height="wrap_content" android:id="@+id/frame12"/> <framelayout android:layout_column="0" android:layout_row="2" android:layout_width="wrap_content" android:background="@color/clwhite" android:layout_height="wrap_content" android:id="@+id/frame20"/> <framelayout android:layout_column="1" android:layout_row="2" android:layout_width="wrap_content" android:background="@color/clwhite" android:layout_height="wrap_content" android:id="@+id/frame21"/> <framelayout android:layout_column="2" android:layout_row="2" android:layout_width="wrap_content" android:background="@color/clwhite" android:layout_height="wrap_content" android:id="@+id/frame22"/> </gridlayout> <linearlayout android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignparentbottom="true" android:gravity="center" android:id="@+id/linearlayout"> <gridlayout android:layout_width="wrap_content" android:layout_height="match_parent" android:paddingtop="0dp"> <button android:layout_row="0" android:layout_column="0" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/btn1" android:text="1"/> <button android:layout_row="0" android:layout_column="1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/btn2" android:text="2"/> <button android:layout_row="0" android:layout_column="2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/btn3" android:text="3"/> <button android:layout_row="1" android:layout_column="0" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/btn4" android:text="4"/> <button android:layout_row="1" android:layout_column="1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/btn5" android:text="5"/> <button android:layout_row="1" android:layout_column="2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/btn6" android:text="6"/> <button android:layout_row="2" android:layout_column="0" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/btn7" android:text="7"/> <button android:layout_row="2" android:layout_column="1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/btn8" android:text="8"/> <button android:layout_row="2" android:layout_column="2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/btn9" android:text="9"/> <button android:layout_row="0" android:layout_column="3" android:layout_rowspan="3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="fill_vertical" android:id="@+id/btnclear" android:text="clear"/> </gridlayout> </linearlayout> </relativelayout> mainactivitysudoku.java
public class mainactivitysudoku extends appcompatactivity implements gridfragmentlistener { private fragmentmanager fragmentmanager; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main_sudoku); createsudokugrid(); } private void createsudokugrid() { fragmentmanager = getfragmentmanager(); fragmenttransaction fragmenttransactionmanager = fragmentmanager.begintransaction(); fragmenttransactionmanager.add(r.id.frame00, new sudokugrid()); fragmenttransactionmanager.add(r.id.frame01, new sudokugrid()); fragmenttransactionmanager.add(r.id.frame02, new sudokugrid()); fragmenttransactionmanager.add(r.id.frame10, new sudokugrid()); fragmenttransactionmanager.add(r.id.frame11, new sudokugrid()); fragmenttransactionmanager.add(r.id.frame12, new sudokugrid()); fragmenttransactionmanager.add(r.id.frame20, new sudokugrid()); fragmenttransactionmanager.add(r.id.frame21, new sudokugrid()); fragmenttransactionmanager.add(r.id.frame22, new sudokugrid()); fragmenttransactionmanager.commit(); } @override protected void onstart() { super.onstart(); toast.maketext(this, "activity started & viewable", toast.length_short).show(); } // gridfragmentlistener @override public void onvaluechange(view view) { //todo here received view } }
well, solution proved simpler expected.
in short, solution move sudokucell constructor code
sudokucell(context context, attributeset attrs) to
sudokucell(context context) since constructor calling.
a few other changes can made improvement, solves fragments not being displayed.
quite simple error
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