What I am trying to accomplish here is to make a Cursor
that could be used in an android ListView
. I'm reading values directly from multiple files and have to feed them to the cursor. I tried to use MatrixCursor
but I can't get it to work with arrays. I have posted my attempt at it so far below and I'm open to all new suggestions. Is there a simpler way to do this?
static MatrixCursor getnameList() {
ArrayList<String> fsitem = getfsiList();
MatrixCursor cursor;
cursor = null;
for (int i = 0; i < fsitem.size(); i++) {
try {
File root = new File(Environment.getExternalStorageDirectory()
.getName() + "/" + fsitem.get(i));
if (root.canRead()) {
File namefile = new File(root, ".name");
FileReader namereader = new FileReader(namefile);
BufferedReader in = new BufferedReader(namereader);
String name = in.readLine();
String id = in.readLine();
String info = in.readLine();
String[] fsii = new String[3];
fsii[0]= name;
fsii[1]= id;
fsii[2]= info;
cursor.addRow(fsii); //crashes here on running.
}
} catch (IOException e) {
Log.e("NameManager.java : ", ("Error!! Not Writable!!"
+ Environment.getExternalStorageDirectory().getName()
+ "/" + fsitem.get(i)));
}
}
This code compiles but crashes at cursor.addRow(fsii);
:
with 02-24 21:16:49.589: E/AndroidRuntime(3895): at com.manager.abcd.r1223.NameManager.getnameList(NameManager.java:81)
.
I'm thinking this is a problem with MartixCursor
not supporting arrays, but I might be wrong. Any ideas?
If this is all the code then it is normal because you try to add a row on a null cursor(you never initialize cursor
) and probably get a NullPointerException
.
Initialize the MatrixCursor
before you enter in the for loop:
String[] columnNames = {"col1", "col2", "col3"};
MatrixCursor cursor = new MatrixCursor(columnNames);
Check the docs.