android - ListView layout weight -
i have 2 linearlayouts in main activity. 1 of them used hold buttons , other 1 used hold listviews. add them dynamically clicking button @ bottom of screen.
i want set layout weight (3f 1st , 2nd button , list , 1f third one)
so, layout:
<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="majewski.ninja.myphonelibrary.listactivity" android:background="#000000"> <linearlayout android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignparenttop="true" android:layout_alignparentleft="true" android:layout_alignparentstart="true" android:id="@+id/fragmentsholder"> </linearlayout> <linearlayout android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/fragmentsholder" android:layout_alignparentleft="true" android:layout_alignparentstart="true" android:id="@+id/listsholder"/> <button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="add new fragment" android:id="@+id/addfragmentbutton" android:layout_alignparentbottom="true" android:layout_centerhorizontal="true" /> </relativelayout> thats how add buttons , listviews:
private void addbuttonandlist(string columnname) { // returns button setted name , layout params button button = getbutton(columnname); // returns list setted name , layout params listview list = getnewlistview(columnname); // adds views 2 of layouts addtolayout(button, list); } and that's how set layout weight(same fot button , listview):
float weight = getcolumnweight(text); // returns 3f, 3f, 1f button.setlayoutparams(new linearlayout.layoutparams(linearlayout.layoutparams.wrap_content, linearlayout.layoutparams.match_parent, weight)); after add 2 columns looks this:
but when add third 1 (with 1f layout width) goes weird (buttons ok though):
what doing wrong?
full code of main activity:
package ninja.majewski.myphonelibrary; import java.util.arraylist; import android.app.activity; import android.os.bundle; import android.view.view; import android.widget.arrayadapter; import android.widget.button; import android.widget.linearlayout; import android.widget.listview; import ninja.majewski.myphonelibrary.data.booklist; public class listactivity extends activity { private booklist booklist; private int numberoflists = 0; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_list); booklist = new booklist(); button addfragmentbutton = (button) findviewbyid(r.id.addfragmentbutton); addfragmentbutton.setonclicklistener(new view.onclicklistener() { @override public void onclick(view v) { switch(numberoflists) { case 0: addbuttonandlist("title"); break; case 1: addbuttonandlist("author"); break; case 2: addbuttonandlist("no."); break; case 3: addbuttonandlist("date"); break; } numberoflists++; } }); } private void addbuttonandlist(string columnname) { // returns button setted name , layout params button button = getbutton(columnname); // returns list setted name , layout params listview list = getnewlistview(columnname); // adds views 2 of layouts addtolayout(button, list); } private button getbutton(string text) { button button = new button(listactivity.this); button.settext(text); float weight = getcolumnweight(text); // returns 3f, 3f, 1f button.setlayoutparams(new linearlayout.layoutparams(linearlayout.layoutparams.wrap_content, linearlayout.layoutparams.match_parent, weight)); return button; } private float getcolumnweight(string text) { float value = 0; switch(text) { case "title": value = 3f; break; case "author": value = 3f; break; case "no.": value = 1f; break; case "date": value = 2f; break; } return value; } private listview getnewlistview(string columnname) { arraylist<string> values = new arraylist<string>(); switch(columnname) { case "title": values = booklist.getnameslist(); break; case "author": values = booklist.getauthorslist(); break; case "no.": values = booklist.getpageslist(); break; case "date": values = booklist.getdateslist(); break; } arrayadapter<string> adapter = new arrayadapter<string>(this, android.r.layout.simple_list_item_1, values); listview list = new listview(this); list.setadapter(adapter); float weight = getcolumnweight(columnname); system.out.println(weight); list.setlayoutparams(new linearlayout.layoutparams(linearlayout.layoutparams.wrap_content, linearlayout.layoutparams.match_parent, weight)); return list; } private void addtolayout(button button, listview list) { linearlayout layout1 = (linearlayout) findviewbyid(r.id.fragmentsholder); layout1.addview(button); linearlayout layout2 = (linearlayout) findviewbyid(r.id.listsholder); layout2.addview(list); } }
when using weights should set layout width 0dp. right you're having each listview decide it's own width wrap_content, linearlayout using weights decide how shrink each view fit them all.
new linearlayout.layoutparams(0, linearlayout.layoutparams.match_parent, weight) 
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