Java No se puede crear el controlador dentro del subproceso que no ha llamado Looper.prepare ()

Vi la mayoría de las preguntas relacionadas, pero no pude encontrar ninguna que solucionara mi problema.

Este es mi código, y no tengo ni idea de lo que estoy haciendo mal.

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static class NamedFile { public File f; public String name; public String ext; public String path; public BitmapDrawable icon; public NamedFile (File file) { f = file; name = f.getName(); if (f.isFile()) { if (name.indexOf('.') != -1) { ext = name.substring(name.lastIndexOf('.') + 1).trim().toLowerCase(); } else { ext = "unknown"; } } path = f.getAbsolutePath(); if (ext == null) { icon = mFolderIcon; } else { BitmapDrawable i = icons.get(ext); if (i == null) { try { int rid = R.drawable.class.getField(ext).getInt(R.drawable.class); icons.put(ext, new BitmapDrawable(Bitmap.createScaledBitmap(BitmapFactory.decodeResource(res, rid, mOpts), iconSize, iconSize, false))); icon = icons.get(ext); } catch (Exception e1) {} } else { icon = i; } }/* else if (ext.equals("jpeg") || ext.equals("jpg") || ext.equals("bmp") || ext.equals("gif") || ext.equals("png")) { Bitmap b = BitmapFactory.decodeFile(path, mOpts); if (b != null) { icon = new BitmapDrawable(Bitmap.createScaledBitmap(b, iconSize, iconSize, false)); } }*/ if (ext != null && (ext.equals("jpeg") || ext.equals("jpg") || ext.equals("bmp") || ext.equals("gif") || ext.equals("png"))) { /* Bitmap b = BitmapFactory.decodeFile(path, mOpts); if (b != null) { icon = new BitmapDrawable(Bitmap.createScaledBitmap(b, iconSize, iconSize, false)); } */ final Handler handler = new Handler() { @Override public void handleMessage(Message message) { HashMap<String, Object> m = ((HashMap<String, Object>)message.obj); sendThumbnail ((String)m.get("path"), (byte[])m.get("data")); } }; Thread thread = new Thread() { public void writeInt (byte[] buff, int pos, int value) { buff[pos] = (byte)(value >>> 24); buff[pos + 1] = (byte)(value >>> 16); buff[pos + 2] = (byte)(value >>> 8); buff[pos + 3] = (byte)value; } @Override public void run() { try { Bitmap b = BitmapFactory.decodeFile(path, mOpts); if (b.getHeight() > 256 || b.getWidth() > 256) { float r; if (b.getHeight() > b.getWidth()) { r = 128f / b.getHeight(); } else { r = 128f / b.getWidth(); } b = Bitmap.createScaledBitmap(b, (int)(r * b.getWidth()), (int)(r * b.getHeight()), false); byte[] buffer = new byte[b.getWidth() * b.getHeight() * 4 + 8]; writeInt (buffer, 0, b.getWidth()); writeInt (buffer, 4, b.getHeight()); int i = 8; for (int y = 0; y < b.getHeight(); y ++) { for (int x = 0; x < b.getWidth(); x ++) { writeInt (buffer, i, b.getPixel(x, y)); i += 4; } } HashMap<String, Object> msg = new HashMap<String, Object>(); msg.put("path", path); msg.put("data", buffer); Message message = handler.obtainMessage(1, msg); handler.sendMessage(message); } } catch (Exception e) { sendLog (e.toString()); } } }; thread.start(); } if (icon == null) { icon = mFileIcon; } } public NamedFile () { } public NamedFile simpleClone () { final NamedFile nf = new NamedFile(); nf.name = name; nf.ext = ext; nf.path = path; return nf; } } 

Esto está anidado dentro de una instrucción if que está en una función de constructor de clase estática y la clase estática está en una clase pública que extiende ListActivity. Soy nuevo en Java.

Error:

 05-01 20:21:58.810: E/AndroidRuntime(584): Uncaught handler: thread AsyncTask #1 exiting due to uncaught exception 05-01 20:21:58.830: E/AndroidRuntime(584): java.lang.RuntimeException: An error occured while executing doInBackground() 05-01 20:21:58.830: E/AndroidRuntime(584): at android.os.AsyncTask$3.done(AsyncTask.java:200) 05-01 20:21:58.830: E/AndroidRuntime(584): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) 05-01 20:21:58.830: E/AndroidRuntime(584): at java.util.concurrent.FutureTask.setException(FutureTask.java:124) 05-01 20:21:58.830: E/AndroidRuntime(584): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) 05-01 20:21:58.830: E/AndroidRuntime(584): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 05-01 20:21:58.830: E/AndroidRuntime(584): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068) 05-01 20:21:58.830: E/AndroidRuntime(584): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561) 05-01 20:21:58.830: E/AndroidRuntime(584): at java.lang.Thread.run(Thread.java:1096) 05-01 20:21:58.830: E/AndroidRuntime(584): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() 05-01 20:21:58.830: E/AndroidRuntime(584): at android.os.Handler.<init>(Handler.java:121) 05-01 20:21:58.830: E/AndroidRuntime(584): at greg.projects.FileTransfer.FileTransferActivity$NamedFile$1.<init>(FileTransferActivity.java:588) 05-01 20:21:58.830: E/AndroidRuntime(584): at greg.projects.FileTransfer.FileTransferActivity$NamedFile.<init>(FileTransferActivity.java:588) 05-01 20:21:58.830: E/AndroidRuntime(584): at greg.projects.FileTransfer.FileTransferActivity$GesturesLoadTask.doInBackground(FileTransferActivity.java:489) 05-01 20:21:58.830: E/AndroidRuntime(584): at greg.projects.FileTransfer.FileTransferActivity$GesturesLoadTask.doInBackground(FileTransferActivity.java:1) 05-01 20:21:58.830: E/AndroidRuntime(584): at android.os.AsyncTask$2.call(AsyncTask.java:185) 05-01 20:21:58.830: E/AndroidRuntime(584): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 05-01 20:21:58.830: E/AndroidRuntime(584): ... 4 more 

(FileTransferActivity.java:588 es final Handler handler = new Handler() { )

 class LooperThread extends Thread { public Handler mHandler; private volatile Looper mMyLooper; public void run() { Looper.prepare(); mHandler = new Handler() { public void handleMessage(Message msg) { // process incoming messages here } }; mMyLooper = Looper.getMyLooper(); Looper.loop(); } public void killMe(){ mMyLooper.quit(); } } 

 LooperThread myLooperThread = new LooperThread(); 

 myLooperThread.killMe(); 

  ActivityName.runOnUiThread(new Runnable() { public void run() { //put your logic here } });