New ui-to set the visible and invisible view

New ui-to set the visible and invisible view

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Introduction to this section:

Controlling the visibility of the view is invisible, which is often understood to be hidden, which is also one of the more properties we use when writing a layout.

For example, hide a button, show it in a specific situation, or click a button and then show the hidden ImageView or

ListView and so on, this property is still relatively common, it is necessary to understand the next! When you need a view, you don't want him to show up

the interface can be considered when using the Visibility This property!

1) XML Settings

android:visibility =" Gone "           //invisible, and does not occupy space
android:visibility =" Visible "         //Visible
android:visibility =" Invisible "     //not visible, but occupies space

p) Java Code Dynamic Settings

Suppose there is such a TextView TV in the interface;

tv.setvisibility(View.gone); //not visible, and does not occupy space, the constant value is: 0x00000008
tv.setvisibility(view.visible); //visible, constant value is: 0x00000000
tv.setvisibility(view.invisible); //not visible, but occupies space, constant value is: 0x00000004

3) Simple use example:

Run:

The use of this property is relatively simple to explain, just look at the sample code:

Activity_main.xml:

<relativelayout xmlns:android= "http://schemas.android.com/apk/res/android" xmlns:tools= "http// Schemas.android.com/tools "android:layout_width=" match_parent "android:layout_height=" Match_parent "Tools:context = "Com.jay.example.visibilitydemo.MainActivity" > <textview android:id= "@+id/txtpage" android:layout _width= "Wrap_content" android:layout_height= "Wrap_content" android:layout_centerinparent= "true" Andro id:text= "1/10" android:textcolor= "#FF7878" android:textsize= "20sp"/> <button android:id= "@+ Id/btnpagebefore "android:layout_width=" wrap_content "android:layout_height=" Wrap_content "Android:la Yout_alignparentleft= "true" android:layout_centervertical= "true" android:text= "prev"/> <butt On android:id= "@+id/btnpagenext" android:layout_width= "wrap_content" android:layout_height= "Wrap_cont Ent "android:layout_alignparentright="True "android:layout_centervertical=" true "android:text=" Next "/></relativelayout> 

Mainactivity.java:

Package Com.jay.example.visibilitydemo;import Android.app.activity;import Android.os.bundle;import Android.view.view;import Android.view.view.onclicklistener;import Android.widget.button;import Android.widget.textview;public class Mainactivity extends Activity {private TextView txtpage;private Button btnpagenext ;p rivate Button btnpagebefore;private myclick myclick;private int page = 1; @Overrideprotected void OnCreate (Bundle savedi Nstancestate) {super.oncreate (savedinstancestate); Setcontentview (R.layout.activity_main); FindViews (); setUpViews ();} private void Findviews () {txtpage = (TextView) Findviewbyid (r.id.txtpage); btnpagenext = (Button) Findviewbyid ( R.id.btnpagenext); Btnpagebefore = (Button) Findviewbyid (R.id.btnpagebefore);} private void Setupviews () {Myclick = new Myclick (); Btnpagenext.setonclicklistener (Myclick); Btnpagebefore.setonclicklistener (Myclick);} Private class Myclick implements Onclicklistener {@Overridepublic void OnClick (View v) {switch (V.getid ()) {case R.ID.BTNP Agenext:Btnpagebefore.setvisibility (view.visible);p age++;txtpage.settext (page + "/10"), if (page = = 10) { Btnpagenext.setvisibility (View.gone);} Break;case r.id.btnpagebefore:btnpagenext.setvisibility (view.visible);p age--;txtpage.settext (page + "/10"); page = = 0) {btnpagebefore.setvisibility (view.gone);} Break;}}}}

New ui-to set the visible and invisible view