Android------basics 1

Yesterday, Qian Feng Company to our school for a week, by the way I also review the Android UI

Yesterday explained in detail the TextView and some of the activity's introduction

Look at the XML first:

<!--layout Arrange the build linearlayout linear layout in a straight line arrangement UI build Xmlns:android namespace equivalent to importandroid:layout_width width android:la  Yout_height Height Match_parent fills the parent component with the maximum value that can be used fill_parentandroid:orientation the arrangement of the build vertically: vertical level: Horizontal --><linearlayout xmlns:android= "http://schemas.android.com/apk/res/android" android:id= "@+id/linearlayout1   "Android:layout_width=" match_parent "android:layout_height=" match_parent "android:orientation=" vertical "> <!--display text components android:text display text wrap_content the contents of the package can be fully displayed android:background= "#F00" background color #RGB 200DP and pixel None The off unit adapts to multiple screens, guaranteeing the same effect on different screens @ resource references are similar to R.     Class + Add will be judged before adding, if present, if present does not add, add the TextView1 Android:id identity UI component to the R class ID subclass if it does not exist. <textview android:id= "@+id/textview1" android:layout_width= "Fill_parent" android:layout_height = "Fill_parent" android:background= "#F00" android:textsize= "30DP" android:text= "@sTring/hello_world "/></linearlayout> 

The following controls are found in the main activity:

Package Com.example.test;import Android.app.activity;import Android.os.bundle;import android.view.menu;import Android.view.view;import android.widget.textview;/** * Activity * One of the four major formation * used to display the application interface, you can interact with the user * click, drag. * @author Licheng * */public class Mainactivity extends Activity {//method inherited from Activity//method called when activity creates a call//main@overri deprotected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);//Set content View//set interface for activity display Index//r.layout.activity_main//res/layout/activity_main.xml//ctrol+d Delete Row setcontentview (R.layout.activity_main); Find the Build View Textview=findviewbyid (R.ID.TEXTVIEW1); Forced type conversion TextView tv= (TextView) TextView;  Modify Content Settings Text Tv.settext ("hehe"); /** * Shortcut key: * 1. Ctrl+shift+o Guide Pack * 2. CTRL + 10,000 can shortcut key * 3. ALT +/code lift */} @Overridepublic Boolean Oncreateoptionsmenu (Menu menu) {//Inflate the menu; This adds items to the action Bar if it is present.getmenuinflater (). Inflate (R.menu.main, menu); return true;}}