Question

I’m building an app framework for Android tablets, and I am running into a strange issue with some ImageButtons. These buttons (Next & Prev) are used to help navigate through “content pages” as part of the framework, and are using custom background drawables.

The issue is that whenever I click on the Prev button, the Next button highlights while the the Prev button does not. At first I thought it was a simple linking or @+id/ issue, but the Prev button’s action is performed, not the Next button’s.

Here is some relevant code:

In onCreate() method:

nextButton = (ImageButton) findViewById(R.id.nextButton);
prevButton = (ImageButton) findViewById(R.id.prevButton);
nextButton.setOnClickListener(this);
prevButton.setOnClickListener(this);

onClick method:

public void onClick(View v) {
    if(_cpp == null){
        finish();
    }else if (v == nextButton) {
        if (!_cpp.nextRes.equalsIgnoreCase("")) {
            // load next page
            _tempRes = _cpp.nextRes;
            //start transition out animations
            fadePageOut();
        } else {
            finish();
        }
    } else if (v == prevButton) {
        if (!_cpp.prevRes.equalsIgnoreCase("")) {
            // load previous page
            _tempRes = _cpp.prevRes;
            //start transition out animations
            fadePageOut();
        }
    }
}

My drawable XML:

<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_enabled="false" android:drawable= "@drawable/prev_arrowhigh" />
<item android:state_pressed="true" android:state_enabled="true"
    android:drawable="@drawable/prev_arrowhigh" />
<item android:state_focused="true" android:state_enabled="true"
    android:drawable="@drawable/prev_arrow" />
<item android:state_enabled="true" android:drawable="@drawable/prev_arrow" />
</selector>

I’ve been debugging and searching for answer for two days now, with no luck. The funny thing is it used to work just fine… but even reverting to a previous version of my project didn’t seem to help at all.

Has anyone encountered this issue before or have any idea what could possibly be the cause of this?

Answer 1

Solved! stupid, stupid me…

Next button was displaying as selected because in my code (part not posted) disables the button during my fadePageOut() method (see posted code). The state-drawable was simply using the wrong images for enabled/disabled states.

This:

<item android:state_enabled="false" android:drawable="@drawable/prev_arrowhigh"/>

Should have been:

<item android:state_enabled="false" android:drawable="@drawable/prev_arrow"/>

two days wasted because of a incorrect image…
*sigh*