ScrollView and ListView (correct calculation of listview height) problem solving _android

First, ListView cannot be used directly, to customize one, and then rewrite the Onmeasure () method:

Copy Code code as follows:

@Override
protected void onmeasure (int widthmeasurespec, int heightmeasurespec) {
int expandspec = Measurespec.makemeasurespec (Integer.max_value >> 2,
Measurespec.at_most);
Super.onmeasure (Widthmeasurespec, Expandspec);
}

Step Two: Write a method to calculate ListView per item:

Copy Code code as follows:

public void Setlistviewheightbasedonchildren (ListView ListView) {

Gets the listview corresponding adapter

ListAdapter listadapter = Listview.getadapter ();

if (ListAdapter = = null) {

Return

}

int totalheight = 0;

for (int i = 0; i < Listadapter.getcount (); i++) {//Listadapter.getcount () returns the number of data items

View ListItem = Listadapter.getview (i, NULL, ListView);

Listitem.measure (0, 0); Calculate the height of a child view

Totalheight + + listitem.getmeasuredheight (); Statistics The total height of all subkeys

}

Viewgroup.layoutparams params = Listview.getlayoutparams ();

Params.height = Totalheight
+ (Listview.getdividerheight () * (Listadapter.getcount ()-1));

Listview.getdividerheight () Gets the height of the delimiter between subkeys

Params.height finally get the entire ListView full display required height

Listview.setlayoutparams (params);

}

Step three: ListView after adding the adapter to set the height:

Copy Code code as follows:

Listview.setadapter (adapter);
New Listviewutil (). Setlistviewheightbasedonchildren (ListView);