What's the state of a pressed Tab in Android

问题

I'm trying to get my tabicon to change when a tab is pressed (i.e. when it changes color when you press the tab, but haven't released yet). I've created a selector as follows:

<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"> 
    <!-- Non focused states --> 
    <item android:state_focused="false" 
          android:state_selected="false" 
          android:state_pressed="false" 
          android:drawable="@drawable/ic_tab_icon1" /> 
    <item android:state_focused="false" 
          android:state_selected="true" 
          android:state_pressed="false" 
          android:drawable="@drawable/ic_tab_icon2" /> 

    <!-- Focused states --> 
    <item android:state_focused="true" 
          android:state_selected="false" 
          android:state_pressed="false" 
          android:drawable="@drawable/ic_tab_icon3" /> 
    <item android:state_focused="true" 
          android:state_selected="true" 
          android:state_pressed="false" 
          android:drawable="@drawable/ic_tab_icon4" /> 

    <!-- Pressed --> 
    <item android:state_pressed="true" 
          android:drawable="@drawable/ic_tab_icon5" /> 
</selector> 

However, for some reason only the first two states are reached (only icon1 and icon 2 are used). Can anyone tell me what the correct state is for a "pressed but not selected" tab?

*Edited to clarify new situation

回答1:

Here is tab_indicator.xml from Android 2.2:

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- Non focused states -->
    <item android:state_focused="false" android:state_selected="false" android:state_pressed="false" android:drawable="@drawable/tab_unselected" />
    <item android:state_focused="false" android:state_selected="true" android:state_pressed="false" android:drawable="@drawable/tab_selected" />

    <!-- Focused states -->
    <item android:state_focused="true" android:state_selected="false" android:state_pressed="false" android:drawable="@drawable/tab_focus" />
    <item android:state_focused="true" android:state_selected="true" android:state_pressed="false" android:drawable="@drawable/tab_focus" />

    <!-- Pressed -->
    <item android:state_pressed="true" android:drawable="@drawable/tab_press" />
</selector>

You do not have anything where android:state_pressed="true". Try changing your selector to look a bit more like what Android uses.

回答2:

this is the default tab_indicator.xml for android. got from this gitkernal. you have to maintain all these states.

<selector xmlns:android="http://schemas.android.com/apk/res/android"> 
    <!-- Non focused states --> 
    <item android:state_focused="false" android:state_selected="false" android:state_pressed="false" android:drawable="@drawable/ic_tab_north_normal" /> 
    <item android:state_focused="false" android:state_selected="true" android:state_pressed="false" android:drawable="@drawable/ic_tab_north_selected" /> 

    <!-- Focused states --> 
    <item android:state_focused="true" android:state_selected="false" android:state_pressed="false" android:drawable="@drawable/ic_tab_north_normal" /> 
    <item android:state_focused="true" android:state_selected="true" android:state_pressed="false" android:drawable="@drawable/ic_tab_north_selected" /> 

    <!-- Pressed --> 
    <item android:state_pressed="true" android:drawable="@drawable/ic_tab_north_normal" /> 
</selector> 

来源：https://stackoverflow.com/questions/3725692/whats-the-state-of-a-pressed-tab-in-android