Here's the code for it:
/**
* Return whether the state matches the desired stateSpec.
*
* @param stateSpec an array of required (if positive) or
* prohibited (if negative) {@link android.view.View} states.
* @param state a {@link android.view.View} state
*/
public static boolean stateSetMatches(int[] stateSpec, int state) {
int stateSpecSize = stateSpec.length;
for (int i = 0; i < stateSpecSize; i++) {
int stateSpecState = stateSpec[i];
if (stateSpecState == 0) {
// We've reached the end of the cases to match against.
return true;
}
if (stateSpecState > 0) {
if (state != stateSpecState) {
return false;
}
} else {
// We use negative values to indicate must-NOT-match states.
if (state == -stateSpecState) {
// We matched a must-not-match case.
return false;
}
}
}
return true;
}
On Wednesday, February 27, 2013 4:05:39 AM UTC-6, skink wrote:
>
> i have tried to use StateSet.stateSetMatches(int[], int) and frankly
> have no idea what is it for. consider the following:
>
> int[] stateSpec = {1, 1, 1};
> int state = 1;
> // stateSpec == {1, 1, 1}
> Log.d(TAG, "onCreate " + testStateSetMatches(stateSpec, state));
>
> stateSpec[2] = 2;
> // stateSpec == {1, 1, 2}
> Log.d(TAG, "onCreate " + testStateSetMatches(stateSpec, state));
>
> stateSpec[2] = 0;
> // stateSpec == {1, 1, 0}
> Log.d(TAG, "onCreate " + testStateSetMatches(stateSpec, state));
>
> and the testStateSetMatches method:
> private String testStateSetMatches(int[] stateSpec, int state) {
> StringBuilder sb = new StringBuilder("{");
> for (int i = 0; i < stateSpec.length; i++) {
> int item = stateSpec[i];
> sb.append(item);
> if (i + 1 < stateSpec.length) {
> sb.append(", ");
> }
> }
> boolean match = StateSet.stateSetMatches(stateSpec, state);
> sb.append("} vs ").append(state).append(" == ").append(match);
> return sb.toString();
> }
>
> the logcat says:
> D/TestTag ( 1069): onCreate {1, 1, 1} vs 1 == true
> D/TestTag ( 1069): onCreate {1, 1, 2} vs 1 == false
> D/TestTag ( 1069): onCreate {1, 1, 0} vs 1 == true
>
> so it seems that it returns true if every element in stateSpec is
> equal to state *or* there is 0 somewhere in between
>
> i don't really get it, i thought it should match if there is at least
> one state in stateSet but it's not the case, so what is the point of
> this method?
>
> btw StateSet.stateSetMatches(int[], int[]) works as expected but int
> variant gets me crazy, can anyone explain what is it for?
>
> pskink
>
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