Android development: the second day -- the first time the control was used

First, let's talk about how to create an activity:

/** Key points for creating an activity * 1. an activity is a class, which must inherit from activity * 2. the oncreate Method * 3 needs to be rewritten. every activity must be in androidmainifest. configure in XML file * 4. add necessary controls for the activity **/

 

Step 2 creates a button control and a textview control for the activity.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"               android:orientation="vertical"               android:layout_width="fill_parent"               android:layout_height="fill_parent">    <TextView        android:id="@+id/myTextView"        android:layout_width="wrap_content"        android:layout_height="wrap_content"/>        <Button         android:id="@+id/myButton"        android:layout_width="fill_parent"        android:layout_height="wrap_content"/></LinearLayout>

 

At the same time, modify the relative layout (relativelayout) of the created project to a relatively simple linear layout (linearlayout ).

In addition, there are five layout methods for Android:

Framelayout (Framework layout), linearlayout (linear layout), absolutelayout (absolute layout), relativelayout (relative layout), tablelayout (table layout)

Return to the Java code, in the oncreate () method:

@ Override public void oncreate (bundle savedinstancestate) {// call the oncreate () method super in the parent class. oncreate (savedinstancestate); // sets the layout file setcontentview (R. layout. activity_main); // the return value of the following function is view, and view is the parent class textview mytextview = (textview) findviewbyid (R. id. mytextview); button mybutton = (button) findviewbyid (R. id. mybutton); mytextview. settext ("first textview"); mybutton. settext ("first button ");}

 

 

Note:

import android.widget.Button;import android.widget.TextView;

 

OK, running effect:

Work hard every day. Come on!

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Author: PANG Hui

Source: http://www.cnblogs.com/pang123hui/

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