Category: IT

[code language=”java”]
{
final InputFilter filter = new InputFilter() {
@Override
public CharSequence filter(CharSequence source,
int start, int end, Spanned dest, int dstart,
int dend)
{
for (int i = start; i < end; i++)
{
if (Character.isDigit(source.charAt(i))||Character.isLetter(source.charAt(i)))
{
return "";
}
}
return null;
}
};
answerTXT.setFilters(new InputFilter[]{filter});
[/code]

ActivityThread casts Application.getBaseContext() to ContextImpl

[code language=”java”]
static ContextImpl getImpl(Context context) {
Context nextContext;
while ((context instanceof ContextWrapper) &&
(nextContext=((ContextWrapper)context).getBaseContext()) != null) {
context = nextContext;
}
return (ContextImpl)context;
}
[/code]

Potential crash when !(context instanceof Activity)

[code language=”java”]
public static Activity unwrap(Context context) {
while (!(context instanceof Activity)) {
ContextWrapper wrapper = (ContextWrapper) context;
context = wrapper.getBaseContext();
}
return context;
}
[/code]