android - java.lang.RuntimeException: Unable to instantiate activity ComponentInfo After tapping button to hit second screen activity -


trying make memory matching game grid of imagebuttons change image after tapping, can't second screen activity start. crashes , gives me logs posted below. attached manifest, , activity second screen.i know second screen activity worked when don't have buttons initialized globally , comment out functions. begginner please help!

android manifest

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="eagle.abhishekravi.abhishek.eagle" >  <application     android:allowbackup="true"     android:icon="@drawable/ic_launcher"     android:label="@string/app_name"     android:theme="@style/apptheme" >     <activity         android:name=".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=".secondscreen"         android:label="operation"         android:theme = "@style/apptheme">          </activity> </application>  </manifest>

mainactivity

public void secondscreen(view view) {      intent getnamescreenintent;     getnamescreenintent = new intent(this, secondscreen.class);     startactivity(getnamescreenintent);     //finish();   }

secondscreen

package eagle.abhishekravi.abhishek.eagle;     public class secondscreen extends activity implements view.onclicklistener {  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);      setcontentview(r.layout.layout);     intent activitythatcalled = getintent();     collections.shuffle(arrays.aslist(res));     iconrandomizer();    }; //initialize buttons in game imagebutton b1 = (imagebutton) findviewbyid(r.id.b1); imagebutton b2 = (imagebutton) findviewbyid(r.id.b2); imagebutton b3 = (imagebutton) findviewbyid(r.id.b3); imagebutton b4 = (imagebutton) findviewbyid(r.id.b4); imagebutton b5 = (imagebutton) findviewbyid(r.id.b5); imagebutton b6 = (imagebutton) findviewbyid(r.id.b6); imagebutton b7 = (imagebutton) findviewbyid(r.id.b7); imagebutton b8 = (imagebutton) findviewbyid(r.id.b8); imagebutton b9 = (imagebutton) findviewbyid(r.id.b9); imagebutton b10 = (imagebutton) findviewbyid(r.id.b10); imagebutton b11 = (imagebutton) findviewbyid(r.id.b11); imagebutton b12 = (imagebutton) findviewbyid(r.id.b12); imagebutton b13 = (imagebutton) findviewbyid(r.id.b13); imagebutton b14 = (imagebutton) findviewbyid(r.id.b14); imagebutton b15 = (imagebutton) findviewbyid(r.id.b15); imagebutton b16 = (imagebutton) findviewbyid(r.id.b16); imagebutton b17 = (imagebutton) findviewbyid(r.id.b17); imagebutton b18 = (imagebutton) findviewbyid(r.id.b18); imagebutton b19 = (imagebutton) findviewbyid(r.id.b19); imagebutton b20 = (imagebutton) findviewbyid(r.id.b20);   //drawables int res[] = new int[] {r.drawable.brownbars,r.drawable.centeredorangedot,       r.drawable.dots, r.drawable.greenlines, r.drawable.lightbulb,   r.drawable.orangedots, r.drawable.orangelines, r.drawable.tree, r.drawable.yellow, r.drawable.yellowwithred};     public void iconrandomizer() {         b1.setonclicklistener(this);     b2.setonclicklistener(this);     b3.setonclicklistener(this);     b4.setonclicklistener(this);     b5.setonclicklistener(this);     b6.setonclicklistener(this);     b7.setonclicklistener(this);  }      public void onclick(view v){     switch (v.getid()){         case r.id.b1:             b1.setimageresource(res[0]);             break;         case r.id.b2:             b2.setimageresource(res[1]);             break;         case r.id.b3:             b3.setimageresource(res[2]);             break;         case r.id.b4:             b4.setimageresource(res[3]);             break;         case r.id.b5:             b5.setimageresource(res[4]);             break;         case r.id.b6:             b6.setimageresource(res[5]);             break;         case r.id.b7:             b7.setimageresource(res[6]);             break;         case r.id.b8:             b8.setimageresource(res[7]);             break;         case r.id.b9:             b9.setimageresource(res[8]);             break;         case r.id.b10:             b10.setimageresource(res[9]);             break;         case r.id.b11:             b11.setimageresource(res[0]);             break;         case r.id.b12:             b12.setimageresource(res[1]);             break;         case r.id.b13:             b13.setimageresource(res[2]);             break;         case r.id.b14:             b14.setimageresource(res[3]);             break;         case r.id.b15:             b15.setimageresource(res[4]);             break;         case r.id.b16:             b16.setimageresource(res[5]);             break;         case r.id.b17:             b17.setimageresource(res[6]);             break;         case r.id.b18:             b18.setimageresource(res[7]);             break;         case r.id.b19:             b19.setimageresource(res[8]);             break;         case r.id.b20:             b20.setimageresource(res[9]);             break;     }   }      }

you have code following:

imagebutton b1 = (imagebutton) findviewbyid(r.id.b1);

the problem code execute during construction, @ time activity has no layout findviewbyid() doesn't work. can declare members, need assign them after have called setcontentview().

imagebutton b1;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.layout);     // assign view references     b1 = (imagebutton) findviewbyid(r.id.b1);     ... }

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