Android Learning Note-activity&intent

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Interface 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"     android:paddingbottom= "@ Dimen/activity_vertical_margin "    android:paddingleft=" @dimen/activity_horizontal_margin "     android:paddingright= "@dimen/activity_horizontal_margin"      android:paddingtop= "@dimen/activity_vertical_margin"     tools:context= " Com.example.activity02.MainActivity " >    <!--          <textview        android:layout_width= "Wrap _content "        android:layout_height=" Wrap_content "         android:text= "@strIng/hello_world " />    -->    <EditText         android:id= "@+id/usernameedittext"          android:layout_width= "Fill_parent"         android:layout_ height= "wrap_content"          android:hint= "username"/>     <button        android:id= "@+id/myButton"          android:layout_width= "Fill_parent"          android:layout_height= "Wrap_content"           android:layout_below= "@+id/usernameedittext"/>        <button         android:id= "@+id/sendbutton"          android:layout_widTh= "Fill_parent"         android:layout_height= "Wrap_content"           android:layout_below= "@+id/mybutton"/></RelativeLayout >

Interface Otheractivity.xml

<?xml version= "1.0" encoding= "Utf-8"? ><linearlayout xmlns:android= "http://schemas.android.com/apk/res/ Android "Android:layout_width=" Match_parent "android:layout_height=" match_parent "android:orientation=" vertical " > <textview android:id= "@+id/mytextview" android:layout_width= "Fill_parent" Android:layo ut_height= "Wrap_content"/></linearlayout>

mainactivity.java

public class mainactivity extends actionbaractivity {private button  mybutton;private button sendbutton;private edittext usernameedittext;      @Override     protected void oncreate (bundle savedinstancestate)   {        super.oncreate (savedinstancestate);         setcontentview (R.layout.activity_main);                 myButton =  (Button)  findviewbyid ( R.id.mybutton);         mybutton.settext ("Pass value");                 sendButton =  (Button)   Findviewbyid (R.id.sendbutton);         sendbutton.settext ("Texting");                 usernameEditText =  (EditText)   Findviewbyid (R.id.usernameedittext);                 mybutton.setonclicklistener (New onclicklistener ()  {@Overridepublic  void  onclick (view v)  {//intent intent = new intent (MainActivity.this,  Otheractivity.class); intent intent = new intent (); Intent.setclass (MainActivity.this,  Otheractivity.class); String username = usernameedittext.gettext (). toString (); Intent.putextra ("username",  username); MainActivity.this.startActivity (intent);//startactivity (intent);});                  Sendbutton.setonclicklistener (New onclicklistener ()  {@Overridepublic  void onclick (View  V)  {//Call the program Uri uri = uri.parse ("s) of the originating lettermsto:18513430780 "); Intent intent = new intent (Intent.action_sendto, uri); Intent.putextra ("Sms_body",  "The sms text"); StartActivity (intent);}});     }}

Otheractivity.java

public class Otheractivity extends Activity{private TextView mytextview; @Overrideprotected void OnCreate (Bundle Savedinstancestate) {super.oncreate (savedinstancestate); Toast.maketext (Getapplicationcontext (), "click", Toast.length_short). Show (); Setcontentview ( r.layout.otheractivity); Mytextview = (TextView) Findviewbyid (R.id.mytextview); String username = getintent (). Getstringextra ("username"); Mytextview.settext ("The value passed is:" + username);}}

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Android Learning Note-activity&intent