android - Unable to start Activity component info -
hello guys second time facing problem in last 2 days. guess there place in code in going horribly wrong. anyways trying here invoke method in class display particular text file in activity class.
mainactivity is:
package com.example.testflashfile; public class mainactivity extends activity{ button nextbutton; button playbutton; button backbutton; readtext readtext=new readtext(this); context contextobject; gesturedetector gesturedetector; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); requestwindowfeature(window.feature_no_title); setrequestedorientation(activityinfo.screen_orientation_sensor); setcontentview(r.layout.activity_main); textview hellotxt = (textview)findviewbyid(r.id.displaytext); hellotxt.settext(readtext.readtxt()); gesturedetector = new gesturedetector(this.getapplicationcontext(),new mygesturedetector()); view mainview = (view) findviewbyid(r.id.mainview); // set touch listener main view our custom gesture listener mainview.setontouchlistener(new view.ontouchlistener() { public boolean ontouch(view v, motionevent event) { if (gesturedetector.ontouchevent(event)) { return true; } return false; } }); playbutton=(button)findviewbyid(r.id.play); playbutton.setonclicklistener(new onclicklistener() { @override public void onclick(view v) { // todo auto-generated method stub intent startanimation=new intent(mainactivity.this,playanimationactivity.class); startanimation.putextra("swf_name","a"); startactivity(startanimation); } }); nextbutton=(button)findviewbyid(r.id.next); nextbutton.setonclicklistener(new onclicklistener() { @override public void onclick(view v) { // todo auto-generated method stub intent intent=new intent(mainactivity.this,secondactivity.class); startactivity(intent); } }); backbutton=(button)findviewbyid(r.id.back); backbutton.setonclicklistener(new onclicklistener() { @override public void onclick(view v) { // todo auto-generated method stub intent intent=new intent(mainactivity.this,fifthactivity.class); startactivity(intent); } }); } @override public boolean oncreateoptionsmenu(menu menu) { // inflate menu; adds items action bar if present. getmenuinflater().inflate(r.menu.activity_main, menu); return true; } public class mygesturedetector extends simpleongesturelistener { @override public boolean onfling(motionevent e1, motionevent e2, float velocityx, float velocityy) { if (math.abs(e1.gety() - e2.gety()) > globalvariables.swipe_max_off_path) { return false; } // right left swipe if(e1.getx() - e2.getx() > globalvariables.swipe_min_distance && math.abs(velocityx) > globalvariables.swipe_threshold_velocity) { intent i= new intent(mainactivity.this,secondactivity.class); startactivity(i); // left right swipe } else if (e2.getx() - e1.getx() > globalvariables.swipe_min_distance && math.abs(velocityx) > globalvariables.swipe_threshold_velocity) { intent i= new intent(mainactivity.this,fifthactivity.class); startactivity(i); } return false; } @override public boolean ondown(motionevent e) { return true; } } } the method readtxt() defined in class below:
package com.example.testflashfile; public class readtext { context context; public readtext(context c) { context = c; readtxt(); } public string readtxt() { inputstream inputstream = context.getresources().openrawresource(r.raw.textone); bytearrayoutputstream bytearrayoutputstream = new bytearrayoutputstream(); int i; try { = inputstream.read(); while (i != -1) { bytearrayoutputstream.write(i); = inputstream.read(); } inputstream.close(); } catch (ioexception e) { // todo auto-generated catch block e.printstacktrace(); } return bytearrayoutputstream.tostring(); } } the manifest file :
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.testflashfile" android:versioncode="1" android:versionname="1.0" > <uses-sdk android:minsdkversion="8" android:targetsdkversion="17" /> <application android:allowbackup="true" android:hardwareaccelerated="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/apptheme" > <activity android:name="com.example.testflashfile.mainactivity" android:label="@string/app_name" android:screenorientation="portrait" > <intent-filter> <action android:name="android.intent.action.main" /> <category android:name="android.intent.category.launcher" /> </intent-filter> </activity> <activity android:name="com.example.testflashfile.secondactivity" android:screenorientation="portrait" > </activity> <activity android:name="com.example.testflashfile.thirdactivity" android:screenorientation="portrait" > </activity> <activity android:name="com.example.testflashfile.fourthactivity" android:screenorientation="portrait" > </activity> <activity android:name="com.example.testflashfile.fifthactivity" android:screenorientation="portrait" > </activity> <activity android:name="com.example.testflashfile.readtext" android:screenorientation="portrait" > </activity> <activity android:name="com.example.testflashfile.playanimationactivity" android:screenorientation="portrait" > </activity> </application> </manifest> the log cat :
03-13 11:01:47.792: d/androidruntime(630): shutting down vm 03-13 11:01:47.843: w/dalvikvm(630): threadid=1: thread exiting uncaught exception (group=0x40015560) 03-13 11:01:47.972: e/androidruntime(630): fatal exception: main 03-13 11:01:47.972: e/androidruntime(630): java.lang.runtimeexception: unable instantiate activity componentinfo{com.example.testflashfile/com.example.testflashfile.mainactivity}: java.lang.nullpointerexception 03-13 11:01:47.972: e/androidruntime(630): @ android.app.activitythread.performlaunchactivity(activitythread.java:1569) 03-13 11:01:47.972: e/androidruntime(630): @ android.app.activitythread.handlelaunchactivity(activitythread.java:1663) 03-13 11:01:47.972: e/androidruntime(630): @ android.app.activitythread.access$1500(activitythread.java:117) 03-13 11:01:47.972: e/androidruntime(630): @ android.app.activitythread$h.handlemessage(activitythread.java:931) 03-13 11:01:47.972: e/androidruntime(630): @ android.os.handler.dispatchmessage(handler.java:99) 03-13 11:01:47.972: e/androidruntime(630): @ android.os.looper.loop(looper.java:123) 03-13 11:01:47.972: e/androidruntime(630): @ android.app.activitythread.main(activitythread.java:3683) 03-13 11:01:47.972: e/androidruntime(630): @ java.lang.reflect.method.invokenative(native method) 03-13 11:01:47.972: e/androidruntime(630): @ java.lang.reflect.method.invoke(method.java:507) 03-13 11:01:47.972: e/androidruntime(630): @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:839) 03-13 11:01:47.972: e/androidruntime(630): @ com.android.internal.os.zygoteinit.main(zygoteinit.java:597) 03-13 11:01:47.972: e/androidruntime(630): @ dalvik.system.nativestart.main(native method) 03-13 11:01:47.972: e/androidruntime(630): caused by: java.lang.nullpointerexception 03-13 11:01:47.972: e/androidruntime(630): @ android.content.contextwrapper.getresources(contextwrapper.java:80) 03-13 11:01:47.972: e/androidruntime(630): @ com.example.testflashfile.readtext.readtxt(readtext.java:24) 03-13 11:01:47.972: e/androidruntime(630): @ com.example.testflashfile.readtext.<init>(readtext.java:14) 03-13 11:01:47.972: e/androidruntime(630): @ com.example.testflashfile.mainactivity.<init>(mainactivity.java:26) 03-13 11:01:47.972: e/androidruntime(630): @ java.lang.class.newinstanceimpl(native method) 03-13 11:01:47.972: e/androidruntime(630): @ java.lang.class.newinstance(class.java:1409) 03-13 11:01:47.972: e/androidruntime(630): @ android.app.instrumentation.newactivity(instrumentation.java:1021) 03-13 11:01:47.972: e/androidruntime(630): @ android.app.activitythread.performlaunchactivity(activitythread.java:1561) 03-13 11:01:47.972: e/androidruntime(630): ... 11 more 03-13 11:01:52.054: i/process(630): sending signal. pid: 630 sig: 9 things have tried: 1. class readtext mentioned in manifest. 2. checked similar threads on stack overflow in related questions.
please note: problem in line number 41:
hellotxt.settext(readtext.readtxt()); any help/suggestions/pointers write question appreciated.
answer: (thanks @ρяσѕρєя k )
the readtext=new readtext(this); should inside oncreate method of activity.
that solved problem. still know why defining inside oncreate essential.
thanks.
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