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public static boolean isInMainThread() {  return Looper.myLooper() == Looper.getMainLooper(); } 

private boolean isInMainThread() {  Looper myLooper = Looper.myLooper();  Looper mainLooper = Looper.getMainLooper();  Log.i(LOGTAG, "isInMainThread myLooper=" + myLooper  + ";mainLooper=" + mainLooper);  return myLooper == mainLooper; } 

Log.i(LOGTAG, "testInMainThread inMainThread=" + isInMainThread()); 

I/TestInMainThread(32028): isInMainThread myLooper=Looper{40d35ef8};mainLooper=Looper{40d35ef8} I/TestInMainThread(32028): testInMainThread inMainThread=true 

new Thread() {  @Override  public void run() {  Log.i(LOGTAG, "testIn NOT in MainThread isMainThread="  + isInMainThread());  super.run();  } }.start(); 

I/TestInMainThread(32028): isInMainThread myLooper=null;mainLooper=Looper{40d35ef8} I/TestInMainThread(32028): testIn NOT in MainThread isMainThread=false 

new Thread() {  private Handler mHandler;  @Override  public void run() {  Looper.prepare();  mHandler = new Handler() {  public void handleMessage(Message msg) {  // process incoming messages here  }  };  Log.i(LOGTAG, "testInNonMainLooperThread isMainThread="  + isInMainThread());  Looper.loop();  }  }.start(); 

I/TestInMainThread(32028): isInMainThread myLooper=Looper{40d72c58};mainLooper=Looper{40d35ef8} I/TestInMainThread(32028): testInNonMainLooperThread isMainThread=false 

// sThreadLocal.get() will return null unless you've called prepare(). static final ThreadLocal<Looper> sThreadLocal = new ThreadLocal<Looper>(); private static Looper sMainLooper; // guarded by Looper.class  /**  * Initialize the current thread as a looper, marking it as an  * application's main looper. The main looper for your application  * is created by the Android environment, so you should never need  * to call this function yourself.  See also: {@link #prepare()}  */ public static void prepareMainLooper() {  prepare(false);  synchronized (Looper.class) {  if (sMainLooper != null) {  throw new IllegalStateException("The main Looper has already been prepared.");  }  sMainLooper = myLooper();  } }  private static void prepare(boolean quitAllowed) {  if (sThreadLocal.get() != null) {  throw new RuntimeException("Only one Looper may be created per thread");  }  sThreadLocal.set(new Looper(quitAllowed)); }  /**  * Return the Looper object associated with the current thread.   * Returns null if the calling thread is not associated with a Looper.  */ public static Looper myLooper() {  return sThreadLocal.get(); }   /** Returns the application's main looper, which lives in the main thread of the application.  */ public static Looper getMainLooper() {  synchronized (Looper.class) {  return sMainLooper;  } }