When using Camera TextureView , occur nullpointerExceptipn on android -


my app camera preview using textureview.

now situation, when in app clicked button start wifiapp

intent intent = getpackagemanager().getlaunchintentforpackage("kr.co.aaa.wifiapp"); startactivity(intent);

at time, call onsurfacetexturedestroyed , onpause

@override public boolean onsurfacetexturedestroyed(surfacetexture surfacetexture) {     mcamera.setpreviewcallback(null);     mcamera.release();     mcamera = null; }

and in wifiapp, click button, restart app.

at time, call onsurfacetextureavailable 

@override public void onsurfacetextureavailable(surfacetexture surfacetexture, int width, int height) {   try {          mcamera.setpreviewtexture(surfacetexture);  //npe        mcamera.startpreview();   } catch (ioexception e) {       e.printstacktrace();   } }

when restart app, occur nullpointerexception

java.lang.nullpointerexception: attempt invoke virtual method 'void android.hardware.camera.setpreviewtexture(android.graphics.surfacetexture)' on null object reference @ kr.co.iosystem.blackeyeonandroid.video.cameratextureview.onsurfacetextureavailable(cameratextureview.java:82) @ android.view.textureview.gethardwarelayer(textureview.java:368) @ android.view.view.updatedisplaylistifdirty(view.java:15157) @ android.view.view.draw(view.java:15954) @ android.view.viewgroup.drawchild(viewgroup.java:3609) @ android.view.viewgroup.dispatchdraw(viewgroup.java:3399) @ android.view.view.draw(view.java:16187) @ android.view.view.updatedisplaylistifdirty(view.java:15180) @ android.view.view.draw(view.java:15954) @ android.view.viewgroup.drawchild(viewgroup.java:3609) @ android.view.viewgroup.dispatchdraw(viewgroup.java:3399) @ android.view.view.updatedisplaylistifdirty(view.java:15175) @ android.view.view.draw(view.java:15954) @ android.view.viewgroup.drawchild(viewgroup.java:3609) @ android.view.viewgroup.dispatchdraw(viewgroup.java:3399) @ android.view.view.draw(view.java:16187) @ android.view.view.updatedisplaylistifdirty(view.java:15180) @ android.view.view.draw(view.java:15954) @ android.view.viewgroup.drawchild(viewgroup.java:3609) @ android.view.viewgroup.dispatchdraw(viewgroup.java:3399) @ android.view.view.updatedisplaylistifdirty(view.java:15175) @ android.view.view.draw(view.java:15954) @ android.view.viewgroup.drawchild(viewgroup.java:3609) @ android.view.viewgroup.dispatchdraw(viewgroup.java:3399) @ android.view.view.updatedisplaylistifdirty(view.java:15175) @ android.view.view.draw(view.java:15954) @ android.view.viewgroup.drawchild(viewgroup.java:3609) @ android.view.viewgroup.dispatchdraw(viewgroup.java:3399) @ android.view.view.draw(view.java:16187) @ com.android.internal.policy.phonewindow$decorview.draw(phonewindow.java:2690) @ android.view.view.updatedisplaylistifdirty(view.java:15180) @ android.view.threadedrenderer.updateviewtreedisplaylist(threadedrenderer.java:282) @ android.view.threadedrenderer.updaterootdisplaylist(threadedrenderer.java:288) @ android.view.threadedrenderer.draw(threadedrenderer.java:323) @ android.view.viewrootimpl.draw(viewrootimpl.java:2609) @ android.view.viewrootimpl.performdraw(viewrootimpl.java:2428) @ android.view.viewrootimpl.performtraversals(viewrootimpl.java:2061) @ android.view.viewrootimpl.dotraversal(viewrootimpl.java:1107) @ android.view.viewrootimpl$traversalrunnable.run(viewrootimpl.java:6007) @ android.view.choreographer$callbackrecord.run(choreographer.java:858) @ android.view.choreographer.docallbacks(choreographer.java:670) @ android.view.choreographer.doframe(choreographer.java:606) @ android.view.choreographer$framedisplayeventreceiver.run(choreographer.java:844) @ android.os.handler.handlecallback(handler.java:739) @ android.os.handler.dispatchmessage(handler.java:95) @ android.os.looper.loop(looper.java:148) @ android.app.activitythread.main(activitythread.java:5415) @ java.lang.reflect.method.invoke(native method) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:745) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:635)

i think occur npe onsurfacetexturedestroyed mcamera = null; .

because when app restart, mcamera status null call onsurfacetextureavailable , mcamera.setpreviewtexture(surfacetexture) null.

so try delete mcamera = null

but occur diffrent error.

java.lang.runtimeexception: camera being used after camera.release() called @ android.hardware.camera.setpreviewtexture(native method) @ kr.co.iosystem.blackeyeonandroid.video.cameratextureview.onsurfacetextureavailable(cameratextureview.java:82) @ android.view.textureview.gethardwarelayer(textureview.java:368) @ android.view.view.updatedisplaylistifdirty(view.java:15157) @ android.view.view.draw(view.java:15954) @ android.view.viewgroup.drawchild(viewgroup.java:3609) @ android.view.viewgroup.dispatchdraw(viewgroup.java:3399) @ android.view.view.draw(view.java:16187) @ android.view.view.updatedisplaylistifdirty(view.java:15180) @ android.view.view.draw(view.java:15954) @ android.view.viewgroup.drawchild(viewgroup.java:3609) @ android.view.viewgroup.dispatchdraw(viewgroup.java:3399) @ android.view.view.updatedisplaylistifdirty(view.java:15175) @ android.view.view.draw(view.java:15954) @ android.view.viewgroup.drawchild(viewgroup.java:3609) @ android.view.viewgroup.dispatchdraw(viewgroup.java:3399) @ android.view.view.draw(view.java:16187) @ android.view.view.updatedisplaylistifdirty(view.java:15180) @ android.view.view.draw(view.java:15954) @ android.view.viewgroup.drawchild(viewgroup.java:3609) @ android.view.viewgroup.dispatchdraw(viewgroup.java:3399) @ android.view.view.updatedisplaylistifdirty(view.java:15175) @ android.view.view.draw(view.java:15954) @ android.view.viewgroup.drawchild(viewgroup.java:3609) @ android.view.viewgroup.dispatchdraw(viewgroup.java:3399) @ android.view.view.updatedisplaylistifdirty(view.java:15175) @ android.view.view.draw(view.java:15954) @ android.view.viewgroup.drawchild(viewgroup.java:3609) @ android.view.viewgroup.dispatchdraw(viewgroup.java:3399) @ android.view.view.draw(view.java:16187) @ com.android.internal.policy.phonewindow$decorview.draw(phonewindow.java:2690) @ android.view.view.updatedisplaylistifdirty(view.java:15180) @ android.view.threadedrenderer.updateviewtreedisplaylist(threadedrenderer.java:282) @ android.view.threadedrenderer.updaterootdisplaylist(threadedrenderer.java:288) @ android.view.threadedrenderer.draw(threadedrenderer.java:323) @ android.view.viewrootimpl.draw(viewrootimpl.java:2609) @ android.view.viewrootimpl.performdraw(viewrootimpl.java:2428) @ android.view.viewrootimpl.performtraversals(viewrootimpl.java:2061) @ android.view.viewrootimpl.dotraversal(viewrootimpl.java:1107) @ android.view.viewrootimpl$traversalrunnable.run(viewrootimpl.java:6007) @ android.view.choreographer$callbackrecord.run(choreographer.java:858) @ android.view.choreographer.docallbacks(choreographer.java:670) @ android.view.choreographer.doframe(choreographer.java:606) @ android.view.choreographer$framedisplayeventreceiver.run(choreographer.java:844) @ android.os.handler.handlecallback(handler.java:739) @ android.os.handler.dispatchmessage(handler.java:95) @ android.os.looper.loop(looper.java:148) @ android.app.activitythread.main(activitythread.java:5415) @ java.lang.reflect.method.invoke(native method) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:745) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:635)

this error mcamera.setprevietexture(surfacetexture)

how solve problem?

thanks.

full source

public class cameratexture extends textureview implement textureview.surfacetexturelistener {   private camera mcamera;   private textureview mtextureview;    public cameratexture(context context, livecamera livecamera) {     super(context);      mcamera = livecamera.camera;      mtextureveiw = (textureview) activity.findviewbyid(r.id.live);     mtextureview.setsurfacetexturelistener(this);  }   @override   public void onsurfacetextureavailable(surfacetexture surfacetexture, int width, int height) {     try {       mcamera.setpreviewtexture(surfacetexture);       mcamera.startpreview();    } catch (ioexception e) {       e.printstacktrace();    }   }   @override   public void onsurfacetexturesizechanged(surfacetexture surfacetexture, int i, int i2) {  }   @override  public boolean onsurfacetexturedestroyed(surfacetexture surfacetexture) {        mcamera.setpreviewcallback(null);        mcamera.release();        mcamera = null; // if delete line, occur camera being used after camera.release() called  error  }   @override  public void onsurfacetextureupdated(surfacetexture surfacetexture) {     bitmap bitmap = mtextureview.getbitmap();      int width = bitmap.getwidth();     int height = bitmap.getheight();      int[] pixels = new int[bitmap.getheight() * bitmap.getwidth()];     bitmap.getpixels(pixels, 0, width, 0, 0, width, height);  }  }   public class livecamera {    public camera camera; }

if need more information. please comment. thanks.!

please check class name , constructor name

public class cameratexture extends textureview implement textureview.surfacetexturelistener {   private camera mcamera;   private textureview mtextureview;    public cameratexture(context context, livecamera livecamera) {     super(context);      mcamera = livecamera.camera;      mtextureveiw = (textureview) activity.findviewbyid(r.id.live);     mtextureview.setsurfacetexturelistener(this);  }  //your remain code  }

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