Android 的UItoolkit只能在UI线程即主线程被调用，否则会导致CalledFromWrongThreadException。
可以使用AsyncTask来进行一个后台操作(doInBackground)，然后在UI线程公开结果，例如在onPostExecute，onProgressUpdate…。
当需要post一个runnable给非主线程时，Android为线程间交互提供了Handler和Looper。Looper线程和HandlerThread类结合使用，可以容易的避免潜在的竞争情况。
importandroid.os.Handler;
importandroid.os.HandlerThread;
importandroid.os.Looper;
importandroid.os.Message;
public classMineHandlerThread extends HandlerThread {
private Handler handler;
public MineHandlerThread(String name) {
super(name);
}
public Handler getHandler() {
return handler;
}
@Override
public void start() {
super.start();
Looper looper = getLooper(); // willblock until thread’s Looper object is initialized.
handler = new Handler(looper) {
@Override
public void handleMessage(Messagemsg) {
switch (msg.what) {
// process messages here
}
}
};
}
}
然后可以
MineHandlerThread thread= new MineHandlerThread("looper thread");
thread.start();
Handler handler =thread.getHandler();
// careful: this couldreturn null if the handler is not initialized
// yet!
// to post a runnable
handler.post(newRunnable() {
public void run() {
Log.i("Mine", "Thread? " + Thread.currentThread().getName());
}
});
int what = 0;
int arg1 = 1;
int arg2 = 2;
Message msg =Message.obtain(handler, what, arg1, arg2);
handler.sendMessage(msg);
what = 1;
msg = Message.obtain(handler,what, new Long(Thread.currentThread().getId()));
handler.sendMessageAtFrontOfQueue(msg);