Android implementation to set the underline selection effect on the Navigation tab

look directly at the effect . This linearlayout has only two buttons, and the Button1,button1 has an underline selection effect. The Buton2,button2 has an underline selected effect.

Such as.

Package Com.daoge.ui;import Roboguice.activity.roboactivity;import Roboguice.inject.injectview;import Android.graphics.drawable.drawable;import Android.os.bundle;import Android.view.view;import Android.view.view.onclicklistener;import Android.widget.button;import Android.widget.linearlayout;import Com.daoge.utils.densityutils;import Com.daoge.utils.resourcereader;import Com.roboguicetest.r;public Class    Mainactivity extends Roboactivity implements Onclicklistener {@InjectView (r.id.btntab001) Button btnTab001;    @InjectView (r.id.btntab002) Button btnTab002;    @InjectView (R.id.layout_tab) LinearLayout layout_tab;        @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Setcontentview (r.layout.test_layout);    Initallviews ();        } private void Initallviews () {Btntab001.setonclicklistener (this);    Btntab002.setonclicklistener (this); } public void OnClick (View v) {switch (V.getid ()) {Case r.id.btntab001:settabselected (btnTab001);            Break                Case r.id.btntab002:settabselected (btnTab002);            Break        Default:break; }} private void settabselected (Button btnselected) {drawable selecteddrawable = resourcereader.readdrawable        (This, r.drawable.shape_nav_indicator);        int screenwidth = densityutils.getscreensize (Mainactivity.this) [0];        int right = SCREENWIDTH/2;        Selecteddrawable.setbounds (0, 0, right, DENSITYUTILS.DIPTOPX (this, 3));        Btnselected.setselected (TRUE);        Btnselected.setcompounddrawables (NULL, NULL, NULL, selecteddrawable);        int size = Layout_tab.getchildcount ();                for (int i = 0; i < size; i++) {if (Btnselected.getid ()! = Layout_tab.getchildat (i). GetId ()) {                Layout_tab.getchildat (i). SetSelected (false); (Button) Layout_tab.getchildat (i)). setcompounddRawables (NULL, NULL, NULL, NULL); }        }    }}

The most important code is here:

private void settabselected (Button btnselected) {        drawable selecteddrawable = resourcereader.readdrawable (This, R.drawable.shape_nav_indicator);        int screenwidth = densityutils.getscreensize (Mainactivity.this) [0];        int right = SCREENWIDTH/2;        Selecteddrawable.setbounds (0, 0, right, DENSITYUTILS.DIPTOPX (this, 3));        Btnselected.setselected (true);        Btnselected.setcompounddrawables (NULL, NULL, NULL, selecteddrawable);        int size = Layout_tab.getchildcount ();        for (int i = 0; i < size; i++) {            if (Btnselected.getid ()! = Layout_tab.getchildat (i). GetId ()) {                layout_tab.getc Hildat (i). SetSelected (false);                (Button) Layout_tab.getchildat (i)). Setcompounddrawables (NULL, NULL, NULL, NULL);}}}    

Get this drawable, then where does this drawable come from??

R.drawable.shape_nav_indicator

Look at this drawable.shape file.

<?xml version= "1.0" encoding= "Utf-8"? ><shape xmlns:android= "Http://schemas.android.com/apk/res/android"    android:shape= "Rectangle" >    <solid android:color= "@color/global_red"/>    <size android: Width= "1000DP"/>    <padding        android:bottom= "2DP"        android:left= "5DP"        android:right= "5DP"        android:top= "2DP"/></shape>

the Demo:http://pan.baidu.com/s/1jGGG0gm

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Android implementation to set the underline selection effect on the Navigation tab