trying to override getView in a SimpleCursorAdapter gives NullPointerException
- by Dimitry Hristov
Would very much appreciate any help or hint on were to go next.
I'm trying to change the content of a row in ListView programmatically. In one row there are 3 TextView and a ProgressBar. I want to animate the ProgressBar if the 'result' column of the current row is zero.
After reading some tutorials and docs, I came to the conclusion that LayoutInflater has to be used and getView() - overriden. Maybe I am wrong on this.
If I return row = inflater.inflate(R.layout.row, null); from the function, it gives NullPointerException.
Here is the code:
private final class mySimpleCursorAdapter extends SimpleCursorAdapter {
private Cursor localCursor;
private Context localContext;
public mySimpleCursorAdapter(Context context, int layout, Cursor c, String[] from, int[] to) {
super(context, layout, c, from, to);
this.localCursor = c;
this.localContext = context;
}
/**
* 1. ListView asks adapter "give me a view" (getView) for each item of the list
* 2. A new View is returned and displayed
*/
public View getView(int position, View convertView, ViewGroup parent) {
View row = super.getView(position, convertView, parent);
LayoutInflater inflater = (LayoutInflater)localContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
String result = localCursor.getString(2);
int resInt = Integer.parseInt(result);
Log.d(TAG, "row " + row);
// if 'result' column form the TABLE is 0, do something useful:
if(resInt == 0) {
ProgressBar progress = (ProgressBar) row.findViewById(R.id.update_progress);
progress.setIndeterminate(true);
TextView edit1 = (TextView)row.findViewById(R.id.row_id);
TextView edit2 = (TextView)row.findViewById(R.id.request);
TextView edit3 = (TextView)row.findViewById(R.id.result);
edit1.setText("1");
edit2.setText("2");
edit3.setText("3");
row = inflater.inflate(R.layout.row, null);
}
return row;
}
here is the Stack Trace:
03-08 03:15:29.639: ERROR/AndroidRuntime(619): java.lang.NullPointerException
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.SimpleCursorAdapter.bindView(SimpleCursorAdapter.java:149)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.CursorAdapter.getView(CursorAdapter.java:186)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at com.dhristov.test1.test1$mySimpleCursorAdapter.getView(test1.java:105)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.AbsListView.obtainView(AbsListView.java:1256)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.ListView.makeAndAddView(ListView.java:1668)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.ListView.fillDown(ListView.java:637)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.ListView.fillSpecific(ListView.java:1224)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.ListView.layoutChildren(ListView.java:1499)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.AbsListView.onLayout(AbsListView.java:1113)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.view.View.layout(View.java:6830)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:998)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.LinearLayout.onLayout(LinearLayout.java:918)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.view.View.layout(View.java:6830)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:998)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.LinearLayout.onLayout(LinearLayout.java:918)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.view.View.layout(View.java:6830)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.view.View.layout(View.java:6830)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:998)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.LinearLayout.onLayout(LinearLayout.java:918)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.view.View.layout(View.java:6830)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.view.View.layout(View.java:6830)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.view.ViewRoot.performTraversals(ViewRoot.java:996)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.view.ViewRoot.handleMessage(ViewRoot.java:1633)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.os.Handler.dispatchMessage(Handler.java:99)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.os.Looper.loop(Looper.java:123)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.app.ActivityThread.main(ActivityThread.java:4363)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at java.lang.reflect.Method.invokeNative(Native Method)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at java.lang.reflect.Method.invoke(Method.java:521)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
03-08 03:15:29.639: ERROR/AndroidRuntime(619): at dalvik.system.NativeStart.main(Native Method)
