Setting selected TAB with a small triangle below it

问题

I want my tabs to show like in the image with small triangle below it.Is this possible ?If yes, then help me with some codes or documentation.

回答1:

I think, the following approach is the simplest one. You just need to setup the following drawable (actually, it's Android's default drawable for tabs) as a background of the tabs:

<?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/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>

where tab_press, tab_focus and tab_selected drawables would be png's (I'd prefer 9-patches) with down-arrow and transparent region near it. tab_unselected drawable wouldn't have this arrow, but still would have same transparent region. The only thing left to do is to specify negative bottom margin for your TabWidget. Its value is determined by the height of the arrow (do not forget to use density independent units):

回答2:

tab_0_info.xml:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/ic_menu_yourImg_selected"
        android:state_selected="true" />
    <item android:drawable="@drawable/ic_menu_yourImg" />
</selector>


private void addTab(int resouceTabId, int drawableId,
        Class<? extends ActivityGroup> groupActivityClass)
{
    Intent intent = new Intent(this, groupActivityClass);
    TabHost.TabSpec spec = tabHost.newTabSpec("tab" + resouceTabId);

    View tabIndicator = LayoutInflater.from(this).inflate(
            R.layout.tab_indicator, getTabWidget(), false);

    TextView title = (TextView) tabIndicator.findViewById(R.id.title);
    title.setText(resouceTabId);
    ImageView icon = (ImageView) tabIndicator.findViewById(R.id.icon);
    icon.setImageResource(drawableId);

    spec.setIndicator(tabIndicator);
    spec.setContent(intent);
    tabHost.addTab(spec);

}

//addTab(R.string.yourTabTitle, R.drawable.tab_0_info, YourGroup.class);

回答3:

You can add images to layout with tabs:

<RelativeLayout
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TabWidget
        android:id="@android:id/tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="0dip" />
    <FrameLayout
        android:fadingEdge="none"
        android:id="@android:id/tabcontent"
        android:layout_width="fill_parent"
        android:layout_height="0px"
        android:layout_below="@android:id/tabs"
        android:layout_alignParentBottom="true"
        android:padding="0px" />
    <ImageView 
        ....
        android:id="@+id/down_arrow_left"/>
    <ImageView 
        ....
        android:id="@+id/down_arrow_right"/>
</RelativeLayout>

and add listener in your tab activity:

getTabHost().setOnTabChangedListener(new OnTabChangeListener() {
        public void onTabChanged(String tabId) {
            if (tabId.equels("left")){
                findViewById(R.id.down_arrow_left).setVisibility(View.VISIBLE);
                findViewById(R.id.down_arrow_right).setVisibility(View.INVISIBLE);
            } else if (tabId.equels("right")){
                findViewById(R.id.down_arrow_left).setVisibility(View.INVISIBLE);
                findViewById(R.id.down_arrow_right).setVisibility(View.VISIBLE);
            }
        }
    });

来源：https://stackoverflow.com/questions/9226863/setting-selected-tab-with-a-small-triangle-below-it

标签

android

tabs

android-tabhost