View android: visibility attribute discussion, androidvisibility

View android: visibility attribute discussion, androidvisibility

The visibility attribute in Android VIEW, which is described in the API as follows:Controls the initial visibility of the view.[Control the initial visibility of the VIEW].

There are three parameters:

* The default value isVisible, Visible. Note that"Invisible"And"Gone. The description in the API is :"Invisible": The VIEW is not displayed, but its position remains in the layout. "Gone": Not displayed, and the VIEW is not added. For example, in A meeting, A did not come to participate, but the location of A remained there, but A was absent. "Gone" means that A does not attend the meeting and is not arranged at the time of arrangement.

The following is a simple example:

:

Code:

1 <? Xml version = "1.0" encoding = "UTF-8"?> 2 <LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" 3 xmlns: tools = "http://schemas.android.com/tools" 4 android: layout_width = "match_parent" 5 android: layout_height = "match_parent" 6 android: orientation = "vertical" 7 tools: context = "$ {relativePackage }. $ {activityClass} "> 8 9 <TextView10 android: id =" @ + id/text1 "11 android: layout_width =" fill_parent "12 android: layout_height =" wrap_content "13 android: background = "@ color/red" 14 android: text = "@ string/view1"/> 15 16 <TextView17 android: id = "@ + id/text2" 18 android: layout_width = "fill_parent" 19 android: layout_height = "wrap_content" 20 android: background = "@ color/green" 21 android: text = "@ string/view2"/> 22 23 <TextView24 android: id = "@ + id/text3" 25 android: layout_width = "fill_parent" 26 android: layout_height = "wrap_content" 27 android: background = "@ color/blue" 28 android: text = "@ string/view3"/> 29 30 <LinearLayout31 android: id = "@ + id/btns" 32 android: layout_width = "fill_parent" 33 android: layout_height = "wrap_content" 34 android: orientation = "horizontal"> 35 36 <Button37 android: id = "@ + id/btn_visible" 38 android: layout_width = "wrap_content" 39 android: layout_height = "wrap_content" 40 android: onClick = "setVisible" 41 android: text = "@ string/btn1"/> 42 43 <Button44 android: id = "@ + id/btn_invisible" 45 android: layout_width = "wrap_content" 46 android: layout_height = "wrap_content" 47 android: onClick = "setInvisible" 48 android: text = "@ string/btn2"/> 49 50 <Button51 android: id = "@ + id/btn_gone" 52 android: layout_width = "wrap_content" 53 android: layout_height = "wrap_content" 54 android: onClick = "setGone" 55 android: text = "@ string/btn3"/> 56 </LinearLayout> 57 58 </LinearLayout>Main_layout 1 <? Xml version = "1.0" encoding = "UTF-8"?> 2 <resources> 3 <color name = "red"> # FF0000 </color> 4 <color name = "green"> #00FF00 </color> 5 <color name =" blue "> # 0000FF </color> 6 </resources> 7 8 9 <? Xml version = "1.0" encoding = "UTF-8"?> 10 <resources> 11 12 <string name = "app_name"> VisiblityApp </string> 13 <string name = "view1"> View1 </string> 14 <string name = "view2 "> View2 </string> 15 <string name =" view3 "> View3 </string> 16 <string name =" btn1 "> Visible </string> 17 <string name = ""btn2"> Invisible </string> 18 <string name = "btn3"> Gone </string> 19 20 </resources>Color. xml string. xml 1 public class MainActivity extends Activity {2 private TextView textView2; 3 4 @ Override 5 protected void onCreate (Bundle savedInstanceState) {6 super. onCreate (savedInstanceState); 7 setContentView (R. layout. activity_main); 8 textView2 = (TextView) findViewById (R. id. text2); 9} 10 11 public void setVisible (View v) {12 textView2.setVisibility (View. VISIBLE); 13} 14 15 public void setInvisible (View v) {16 textView2.setVisibility (View. INVISIBLE); 17} 18 19 public void setGone (View v) {20 textView2.setVisibility (View. GONE); 21} 22 23}MainActivity

 

* This ends.

Extra article: I think I have been away from J2EE for two years. I have experienced a lot in the past two years and have seen a lot in the past two years. Maybe all of this is self-defeating... Well, we have to continue. Let's go step by step. In the days to come, I will write an article every day to record the Android learning path.