illegalstateexception

问题 I am trying to play an audio file from the internal storage. The code I used is.. package com.abhi.firstapp.firstapp; import android.content.Context; import android.media.AudioManager; import android.media.MediaPlayer; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.support.design.widget.FloatingActionButton; import android.support.design.widget.Snackbar; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar;

问题 I was using Eclipse to compile the app, I used to get this error but not a lot. But since I've switch to android studio, I'm getting this crash a lot. Its crashing pretty much every device. I've tried doing everything but can't seem to fix this issue. I've tried using both getfragmentManager() and getSupportFragmentManager(), getting this crash in both. Not sure what to do now? Below is the code I'm using to switch fragments. private void showFragment(Fragment fragment){ fragmentManager =

问题 I have an Android app that need to set a requestproperty in a connection. Here is my code: URL url = new URL(sUrl); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setRequestProperty("cookie", cookievalue); connection.connect(); When I call the setRequestProperty method it launch the exception: java.lang.IllegalStateException: Cannot set request property after connection is made Is there a way to create the connection to the file without using the url

问题 After a few hours of trying to work this out I am stumped. I am somewhat new to Java and could use some help. The Stack Trace: java.lang.IllegalStateException: Component must have a valid peer at java.awt.Component$FlipBufferStrategy.createBuffers(Unknown Source) at java.awt.Component$FlipBufferStrategy.<init>(Unknown Source) at java.awt.Component$FlipSubRegionBufferStrategy.<init>(Unknown Source) at java.awt.Component.createBufferStrategy(Unknown Source) at java.awt.Canvas

问题 I have a problem with my first JSF/IceFaces (version 1.8.2) application running on JBoss 5.1.0. I recieve an exception after a while, telling me about session problems. This is weird, because i do not use sessions in my code at all. The following logs show that none of my backing beans can be instantiated because of this error (from JBoss): com.sun.faces.mgbean.ManagedBeanCreationException: Cant instantiate class: bean.Abgrenzungsreise. at com.sun.faces.mgbean.BeanBuilder.newBeanInstance

问题 I am trying to remove an item from my RecyclerView , but I always get an error. java.lang.IllegalStateException: Cannot call this method while RecyclerView is computing a layout or scrolling I am using notifyDataSetChanged() . How can I solve this? Here is my adapter code public class ListAdapters extends RecyclerView.Adapter<ListAdapters.MyViewHolder> { public ArrayList<String> tvdatalist; Context c; int pos; ListAdapters.MyViewHolder myViewHolder; private LayoutInflater layoutInflater; int[

问题 I'm using viewpager to display pictures. I just need three fragments basically: previous image to preview, current display image and next image to preview. I would like to just display a preview of previous and next image, it will change to full image when user actually swipe to it. So I'm thinking of just using 3 fragment to achieve this. Code is below: private class ImagePagerAdapter extends FragmentStatePagerAdapter implements ViewPager.OnPageChangeListener { private ImageFragment

问题 I am using the following code to generate a video. However, one in every 5 attempts the readSampleData raises either a IllegalArgumentException or a IllegalStateException. What can I do to stop the exceptions. Can I check the state of the extractor before calling readSampleData. If so, how? MediaExtractor videoExtractor = new MediaExtractor(); videoExtractor.setDataSource(SOURCE); Log.d(TAG, "Video Extractor Track Count " + videoExtractor.getTrackCount() ); MediaMuxer muxer = new MediaMuxer

问题 I went to sleep yesterday with my app working and today when I tried to run it won't start at all. As soon as I try to open it crashes with a java.lang.IllegalStateException . I've gone several commits back in my code just to rule out it was something I did recently and still. This makes no sense, how can an app just stop working over night? I've looked for the error in the internet and there is not a lot of useful information about it. Is this really an odd error? Here's the complete stack

问题 I just updated to appcompat library from 23.1.1 to 23.2 and now application stopped working on java.lang.IllegalStateException: View can not be anchored to the the parent CoordinatorLayout. java.lang.IllegalStateException: View can not be anchored to the the parent CoordinatorLayout Crash comes from resolveAnchorView method of CoordinatorLayout when parent (CoordinatorLayout is not in edit mode). Layout is used as root element in base activity and contains different layouts (toolbar,