This is often used to wait for asynchronous operations to finish and the system to reach a * desired state. * *
If the predicate function throws an exception and interrupts the waiting, the exception * will be wrapped in an {@link RuntimeException}. * * @param predicate A lambda function that specifies the condition to wait for. This function * should return true when the desired state has been reached. * @param timeout The number of seconds to wait for before giving up. * @return true if the operation finished before timeout, false otherwise. */ public static boolean waitUntil(Utils.Predicate predicate, int timeout) { timeout *= 10; try { while (!predicate.waitCondition() && timeout >= 0) { Thread.sleep(100); timeout -= 1; } if (predicate.waitCondition()) { return true; } } catch (Throwable e) { throw new RuntimeException(e); } return false; } /** * Wait on a specific snippet event. * *
This allows a snippet to wait on another SnippetEvent as long as they know the name and
* callback id. Commonly used to make async calls synchronous, see {@link
* SmsSnippet#waitForSms()} waitForSms} for example usage.
*
* @param callbackId String callbackId that we want to wait on.
* @param eventName String event name that we are waiting on.
* @param timeout int timeout in milliseconds for how long it will wait for the event.
* @return SnippetEvent if one was received.
* @throws Throwable if interrupted while polling for event completion. Throws TimeoutException
* if no snippet event is received.
*/
public static SnippetEvent waitForSnippetEvent(
String callbackId, String eventName, Integer timeout) throws Throwable {
String qId = EventCache.getQueueId(callbackId, eventName);
LinkedBlockingDeque Sample usage:
*
*
* boolean result = (boolean) Utils.invokeByReflection(
* mWifiManager,
* "setWifiApEnabled", null /* wifiConfiguration * /, true /* enabled * /);
*
*
* @param instance Instance of object defining the method to call.
* @param methodName Name of the method to call. Can be inherited.
* @param args Variadic array of arguments to supply to the method. Their types will be used to
* locate a suitable method to call. Subtypes, primitive types, boxed types, and {@code
* null} arguments are properly handled.
* @return The return value of the method, or {@code null} if no return value.
* @throws NoSuchMethodException If no suitable method could be found.
* @throws Throwable The exception raised by the method, if any.
*/
public static Object invokeByReflection(Object instance, String methodName, Object... args)
throws Throwable {
// Java doesn't know if invokeByReflection(instance, name, null) means that the array is
// null or that it's a non-null array containing a single null element. We mean the latter.
// Silly Java.
if (args == null) {
args = new Object[] {null};
}
// Can't use Class#getMethod(Class...) because it expects that the passed in classes
// exactly match the parameters of the method, and doesn't handle superclasses.
Method method = null;
METHOD_SEARCHER:
for (Method candidateMethod : instance.getClass().getMethods()) {
// getMethods() returns only public methods, so we don't need to worry about checking
// whether the method is accessible.
if (!candidateMethod.getName().equals(methodName)) {
continue;
}
Class[] declaredParams = candidateMethod.getParameterTypes();
if (declaredParams.length != args.length) {
continue;
}
for (int i = 0; i < declaredParams.length; i++) {
if (args[i] == null) {
// Null is assignable to anything except primitives.
if (declaredParams[i].isPrimitive()) {
continue METHOD_SEARCHER;
}
} else {
// Allow autoboxing during reflection by wrapping primitives.
Class declaredClass = Primitives.wrap(declaredParams[i]);
Class actualClass = Primitives.wrap(args[i].getClass());
TypeToken declaredParamType = TypeToken.of(declaredClass);
TypeToken actualParamType = TypeToken.of(actualClass);
if (!declaredParamType.isSupertypeOf(actualParamType)) {
continue METHOD_SEARCHER;
}
}
}
method = candidateMethod;
break;
}
if (method == null) {
StringBuilder methodString =
new StringBuilder(instance.getClass().getName())
.append('#')
.append(methodName)
.append('(');
for (int i = 0; i < args.length - 1; i++) {
methodString.append(args[i].getClass().getSimpleName()).append(", ");
}
if (args.length > 0) {
methodString.append(args[args.length - 1].getClass().getSimpleName());
}
methodString.append(')');
throw new NoSuchMethodException(methodString.toString());
}
try {
Object result = method.invoke(instance, args);
return result;
} catch (InvocationTargetException e) {
throw e.getCause();
}
}
/**
* Convert a byte array (binary data) to a hexadecimal string (ASCII)
* representation.
* [\x01\x02] -> "0102"
*
* @param bytes The array of byte to convert.
* @return a String with the ASCII hex representation.
*/
public static String bytesToHexString(byte[] bytes) {
char[] hexChars = new char[bytes.length * 2];
for ( int j = 0; j < bytes.length; j++ ) {
int v = bytes[j] & 0xFF;
hexChars[j * 2] = hexArray[v >>> 4];
hexChars[j * 2 + 1] = hexArray[v & 0x0F];
}
return new String(hexChars);
}
}