Use intent to implement interface jump in Android

Intent Messenger, intention

By intent to assist in jumping between various components of Android

1.

StartActivity (Intent)

Create a new class under the package, Factivity.class

public class Factivity extends appcompatactivity {@Override protected void onCreate (Bundle savedinstancestate) {        Super.oncreate (savedinstancestate);    Setcontentview (r.layout.factivity); }}

Create a new XML file Factivity.xml

<button android:id= "@+id/bt1" android:layout_width= "match_parent" android:layout_height= "Wrap_content" Android oid:text= "First"/><button android:id= "@+id/bt2" android:layout_width= "Match_parent" android:layout_height= "    Wrap_content "android:text=" Second "/><textview android:id=" @+id/text1 "android:layout_width=" Wrap_content "    android:layout_height= "Wrap_content" android:text= "Hello world!" android:layout_gravity= "Center"/>

The second pair class and XML are also created.

Register two new classes in Androidmanifest and place the default startup class at the top:

<?xml version= "1.0"  encoding= "Utf-8"? ><manifest xmlns:android= "http// Schemas.android.com/apk/res/android "    package=" Com.bcp.layouttest ">     <application        android:allowbackup= "true"          android:icon= "@mipmap/ic_launcher"          android:label= "@string/app_name"         android: Supportsrtl= "true"         android:theme= "@style/apptheme" >         <activity android:name= ". Factivity ">            <intent-filter>                 <action  android:name= "Android.intent.action.MAIN"  />                <category android:name= " Android.intent.category.LAUNCHER " />             </intent-filter>        </activity>         <activity android:name= ". Sactivity ">            <intent-filter>                 <action  android:name= "Android.intent.action.MAIN"  />                 <category android:name= " Android.intent.category.LAUNCHER " />             </intent-filter>        </activity>  &nbsP;     <activity android:name= ". Mainactivity ">            <intent-filter>                 <action  android:name= "Android.intent.action.MAIN"  />                 <category android:name= " Android.intent.category.LAUNCHER " />             </intent-filter>        </activity>     </application></manifest>

To add a button event:

Public class factivity extends appcompatactivity {    private  Button bt_first;     @Override     protected void  OnCreate (bundle savedinstancestate)  {        super.oncreate ( Savedinstancestate);         setcontentview (R.layout.factivity);         /***         *  Click the first button to implement the jump page          */         bt_first=  (Button)  findviewbyid (R.ID.BT1);         bt_first.setonclicklistener (New view.onclicklistener ()  {              @Override              public void oNclick (View view)  {                                  intent intent=new intent ();                 //First: Context object                  //Second: Target file                  intent.setClass  (Factivity.this,sactivity.class);                 startactivity (Intent);             }        } );     }}

2.

Startactivityforresult (Intent,requestcode);

Onactivityresult (int requestcode,int resultcode,intent data)

Setresult (Resultcode,data);

View Code:

Factivity.java

Public class factivity extends appcompatactivity {    private  Button bt_first;    private Button bt_second;     private textview tv;     @Override     protected void  oncreate (bundle savedinstancestate)  {         Super.oncreate (savedinstancestate);         setcontentview ( r.layout.factivity);        /***          *  Click the first button to implement the jump page          */         bt_first=  (Button)  findviewbyid (R.ID.BT1);         bt_first.setonclicklistener (New view.onclicklistener ()  {              @Override             public void  onclick (View view)  {                 intent intent=new intent ();                 intent.setClass  (Factivity.this,sactivity.class);                 startactivity (Intent );            }         });        /***          *  achieve          */through Startactivityforresult         bt_second=  (Button)  findviewbyid (R.ID.BT2);       &Nbsp; bt_second.setonclicklistener (New view.onclicklistener ()  {              @Override              public void onclick (View view)  {                 intent intent=new intent (). SetClass ( Factivity.this,sactivity.class);                 /***                  *  The second parameter is the requested marker                   */                 startactivityforresult (intent,1);             }         });        tv=  (TextView)   Findviewbyid (R.ID.TEXT1);     }    /***     *   by Startactivityforresult, the method of receiving the returned data      *  one, the requested Mark       *  second page Returns the data that is returned by the      */     *  third page      @Override     protected void onactivityresult (int  Requestcode, int resultcode, intent data)  {         super.onactivityresult (Requestcode, resultcode, data);         //determine if the condition is met to perform the callback data         if (requestcode==1&& resultcode==2) {            string content= Data.getstringextra ("intent"); &NBSp;           tv.settext (content);         }    }}

Sactivity.java

public class sactivity extends appcompatactivity{    private  Button bt;    private string content= "hello~!";      @Override     protected void oncreate ( Bundle  savedinstancestate)  {        super.oncreate (savedInstanceState);         setcontentview (r.layout.sactivity);         /***         *  second page to return data to the first page           *  back to the first page is actually a intent object           */        bt=  (Button)  findviewbyid ( R.ID.BT3);         bt.setonclicklistener (New View.OnClickListener ( )  {             @Override              public void onclick (View view)  {                 intent intent=new intent ();                 //creating a Callback object                  intent.putextra ("intent", content);                 setresult (2,intent);                 //End Current Page                  finish ();             }         });    &nBSP;}} 

Signature and packaging of the app:

1, in order to ensure that each application developer's legal.

2, prevent others through the same package name to confuse the replacement of installed programs, resulting in some malicious tampering

3, to ensure that we release the consistency of each version (such as Automatic Updates will not be installed because of the different version)

Use intent to implement interface jump in Android