I had a problem creating a handler in new thread. This is my code:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new Thread(new Runnable() {
public void run() {
Handler handler = new Handler();
}
}).start();
}
But it raised an error! Can someone please explain this to me? Thanks so much!
Here are the details of my error:
09-17 18:05:29.484: E/AndroidRuntime(810): FATAL EXCEPTION: Thread-75
09-17 18:05:29.484: E/AndroidRuntime(810): java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
09-17 18:05:29.484: E/AndroidRuntime(810): at android.os.Handler.<init>(Handler.java:197)
09-17 18:05:29.484: E/AndroidRuntime(810): at android.os.Handler.<init>(Handler.java:111)
09-17 18:05:29.484: E/AndroidRuntime(810): at com.example.handler.MainActivity$1.run(MainActivity.java:57)
09-17 18:05:29.484: E/AndroidRuntime(810): at java.lang.Thread.run(Thread.java:856)
You could also use a HandlerThread
like this:
HandlerThread thread = new HandlerThread("MyHandlerThread");
thread.start();
Handler handler = new Handler(thread.getLooper());
HandlerThread
s have a Looper
associated with them, so this wouldn't throw an exception.