android - Unable to start a sub activity using intent -


i trying start sub activity main activity using intents using android sdk version 4. doing so, results in error during runtime.

screen error received emulator - "unfortunately myfirstapp has stopped"

logcat error - "could not find class 'com.example.firstapp.displaymessageactivity', referenced method com.example.firstapp.mainactivity.sendmessage"

here "com.example.firstapp.displaymessageactivity" sub activity called main activity "com.example.firstapp.mainactivity"

same file content:

com.example.firstapp.mainactivity

public class mainactivity extends activity {      public final static string extra_message = "com.example.myfirstapp.message";      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          if (savedinstancestate == null) {             getfragmentmanager().begintransaction()                     .add(r.id.container, new placeholderfragment())                     .commit();         }     }       @override     public boolean oncreateoptionsmenu(menu menu) {          // inflate menu; adds items action bar if present.         getmenuinflater().inflate(r.menu.main, menu);         return true;     }      @override     public boolean onoptionsitemselected(menuitem item) {         // handle action bar item clicks here. action bar         // automatically handle clicks on home/up button, long         // specify parent activity in androidmanifest.xml.         int id = item.getitemid();         if (id == r.id.action_settings) {             return true;         }         return super.onoptionsitemselected(item);     }      /**      * placeholder fragment containing simple view.      */     public static class placeholderfragment extends fragment {          public placeholderfragment() {         }          @override         public view oncreateview(layoutinflater inflater, viewgroup container,                 bundle savedinstancestate) {             view rootview = inflater.inflate(r.layout.fragment_main, container, false);             return rootview;         }     }      /** called when user clicks send button */     public void sendmessage(view view) {         intent intent = new intent(this, displaymessageactivity.class);         edittext edittext = (edittext) findviewbyid(r.id.edit_message);         string message = edittext.gettext().tostring();         intent.putextra(extra_message, message);         try {             startactivity(intent);         } catch (activitynotfoundexception e) {             e.printstacktrace();         } catch(exception e) {             e.printstacktrace();         }      }  } 

com.example.firstapp.displaymessageactivity

public class displaymessageactivity extends actionbaractivity {      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);          // message intent         intent intent = getintent();         string message = intent.getstringextra(mainactivity.extra_message);          // create text view         textview textview = new textview(this);         textview.settextsize(40);         textview.settext(message);          // set text view activity layout         setcontentview(textview);     }      @override     public boolean onoptionsitemselected(menuitem item) {         // handle action bar item clicks here. action bar         // automatically handle clicks on home/up button, long         // specify parent activity in androidmanifest.xml.         int id = item.getitemid();         if (id == r.id.action_settings) {             return true;         }         return super.onoptionsitemselected(item);     }      /**      * placeholder fragment containing simple view.      */     public static class placeholderfragment extends fragment {          public placeholderfragment() { }          @override         public view oncreateview(layoutinflater inflater, viewgroup container,                   bundle savedinstancestate) {               view rootview = inflater.inflate(r.layout.fragment_display_message,                       container, false);               return rootview;         }     } } 

android manifest file:

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.example.firstapp"     android:versioncode="1"     android:versionname="1.0" >      <uses-sdk         android:minsdkversion="19"         android:targetsdkversion="19" />      <application         android:allowbackup="true"         android:icon="@drawable/ic_launcher"         android:label="@string/app_name"         android:theme="@style/apptheme" >         <activity             android:name="com.example.firstapp.mainactivity"             android:label="@string/app_name" >             <intent-filter>                 <action android:name="android.intent.action.main" />                  <category android:name="android.intent.category.launcher" />             </intent-filter>         </activity>         <activity             android:name="com.example.myfirstapp.displaymessageactivity"             android:label="@string/title_activity_display_message"             android:parentactivityname="com.example.myfirstapp.mainactivity" >             <meta-data                 android:name="android.support.parent_activity"                 android:value="com.example.myfirstapp.mainactivity" />         </activity>     </application>  </manifest> 

ps: trying follow tutorial content here

any appreciated. thanks

-deep

in manifest have activity named : android:name="com.example.myfirstapp.displaymessageactivity"

actually package name : com.example.firstapp

so manifest must declasre activity as:

<activity             android:name="com.example.firstapp.displaymessageactivity"             android:label="@string/title_activity_display_message"             android:parentactivityname="com.example.firstapp.mainactivity" >             <meta-data                 android:name="android.support.parent_activity"                 android:value="com.example.firstapp.mainactivity" />         </activity> 

silly frustrating error. hope learn focus mistake.


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