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Asked: 2026-05-27T02:38:13+00:00

I’m trying to populate a listviewactivity’s list with objects returned from an DB40 database,

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I’m trying to populate a listviewactivity’s list with objects returned from an DB40 database, but my app keeps crashing and I’m not entirely sure why.

It would help if I knew how to read LogCat and be able to go from what it says -.- I can get a rough understanding I just don’t know what exactly is going wrong.

public class AndrochieveActivity extends ListActivity { 
private List<Achievement> achieves;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    ObjectContainer db = Db4oEmbedded.openFile("achievements.db4o");

    try{
        achieves = db.query(Achievement.class);
    } finally {
        db.close();
    }

    setListAdapter(new ArrayAdapter<Achievement>(this, R.layout.achievelist, achieves) {
        @Override
        public View getView(int pos, View cView, ViewGroup parent) {
            View row = mInflater.inflate(R.layout.achievelist, null);

            TextView title = (TextView) row.findViewById(R.id.title);
            title.setText(getItem(pos).GetTitle());

            TextView desc = (TextView)row.findViewById(R.id.desc);
            desc.setText(getItem(pos).GetDescription());

            TextProgressBar prog = (TextProgressBar)row.findViewById(R.id.prog);
            prog.setProgress(0);
            prog.setMax(getItem(pos).GetMax());

            return row;
        }
    });


}

I’m not seeing anything that would inherently screw it up. Db4oEmbedded.openFile should create the file if it doesn’t exit, but I keep getting a bunch of file read errors in logcat, from what it looks like:

11-29 14:21:44.359: D/AndroidRuntime(19396): Shutting down VM
11-29 14:21:44.359: W/dalvikvm(19396): threadid=1: thread exiting with uncaught exception (group=0x4001d5a0)
11-29 14:21:44.389: E/AndroidRuntime(19396): FATAL EXCEPTION: main
11-29 14:21:44.389: E/AndroidRuntime(19396): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.megalon.androchieve/com.megalon.androchieve.AndrochieveActivity}: com.db4o.ext.Db4oIOException: /achievements.db4o (Read-only file system)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1849)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1870)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at android.app.ActivityThread.access$1500(ActivityThread.java:132)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1051)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at android.os.Handler.dispatchMessage(Handler.java:99)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at android.os.Looper.loop(Looper.java:150)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at android.app.ActivityThread.main(ActivityThread.java:4312)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at java.lang.reflect.Method.invokeNative(Native Method)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at java.lang.reflect.Method.invoke(Method.java:507)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at dalvik.system.NativeStart.main(Native Method)
11-29 14:21:44.389: E/AndroidRuntime(19396): Caused by: com.db4o.ext.Db4oIOException: /achievements.db4o (Read-only file system)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at com.db4o.io.RandomAccessFileFactory.newRandomAccessFile(RandomAccessFileFactory.java:26)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at com.db4o.io.FileStorage$FileBin.<init>(FileStorage.java:43)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at com.db4o.io.FileStorage.open(FileStorage.java:22)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at com.db4o.io.StorageDecorator.open(StorageDecorator.java:27)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at com.db4o.io.CachingStorage.open(CachingStorage.java:52)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at com.db4o.internal.IoAdaptedObjectContainer.openImpl(IoAdaptedObjectContainer.java:57)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at com.db4o.internal.ObjectContainerBase$1.run(ObjectContainerBase.java:140)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at com.db4o.foundation.DynamicVariable.with(DynamicVariable.java:54)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at com.db4o.foundation.Environments.runWith(Environments.java:28)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at com.db4o.internal.ObjectContainerBase.withEnvironment(ObjectContainerBase.java:161)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at com.db4o.internal.ObjectContainerBase.open(ObjectContainerBase.java:131)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at com.db4o.internal.IoAdaptedObjectContainer.<init>(IoAdaptedObjectContainer.java:35)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at com.db4o.internal.ObjectContainerFactory.openObjectContainer(ObjectContainerFactory.java:18)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at com.db4o.Db4oEmbedded.openFile(Db4oEmbedded.java:65)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at com.db4o.Db4oEmbedded.openFile(Db4oEmbedded.java:76)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at com.megalon.androchieve.AndrochieveActivity.onCreate(AndrochieveActivity.java:45)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1072)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1813)
11-29 14:21:44.389: E/AndroidRuntime(19396):    ... 11 more
11-29 14:21:44.389: E/AndroidRuntime(19396): Caused by: java.io.FileNotFoundException: /achievements.db4o (Read-only file system)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at org.apache.harmony.luni.platform.OSFileSystem.open(Native Method)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at dalvik.system.BlockGuard$WrappedFileSystem.open(BlockGuard.java:232)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at java.io.RandomAccessFile.<init>(RandomAccessFile.java:132)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at java.io.RandomAccessFile.<init>(RandomAccessFile.java:173)
11-29 14:21:44.389: E/AndroidRuntime(19396):    at com.db4o.io.RandomAccessFileFactory.newRandomAccessFile(RandomAccessFileFactory.java:19)
11-29 14:21:44.389: E/AndroidRuntime(19396):    ... 28 more
11-29 14:21:44.419: D/dalvikvm(19396): GC_CONCURRENT freed 308K, 49% free 2900K/5639K, external 0K/0K, paused 2ms+3ms
11-29 14:21:46.310: D/Process(19396): killProcess, pid=19396
11-29 14:21:46.310: D/Process(19396): dalvik.system.VMStack.getThreadStackTrace(Native Method)
11-29 14:21:46.320: D/Process(19396): java.lang.Thread.getStackTrace(Thread.java:745)
11-29 14:21:46.320: D/Process(19396): android.os.Process.killProcess(Process.java:797)
11-29 14:21:46.320: D/Process(19396): com.android.internal.os.RuntimeInit$UncaughtHandler.uncaughtException(RuntimeInit.java:108)
11-29 14:21:46.320: D/Process(19396): java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:854)
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1 Answer

  1. Editorial Team

    look at this code (for sqlite)

                String currentTimeString = new SimpleDateFormat(
                    "yyyy.MM.dd.'at'.hhaaa").format(new Date());
            Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            File file = new File(Environment.getExternalStorageDirectory(),
                    currentTimeString + ".jpg");
            outputFileUri = Uri.fromFile(file);
            intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
            startActivityForResult(intent, TAKE_PICTURE);

    see how my new file statement gives the specific directory, you need to do this as well.
    also look here as it is exactly the same problem Getting Access denied trying to read a file in App_Data in a ASP.NET project – Any pointers?
    if none of this helps you need to post the code for Db4oEmbedded

    whooops didnt realize that post was asp.net o well if none of this works like i said post the code for that other class

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