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Last active November 5, 2018 23:07
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Allow to detect Ambient mode to switch Watch face display on Wear devices
Handler handler = new Handler(Looper.getMainLooper());
final DisplayManager displayManager = (DisplayManager) getSystemService(Context.DISPLAY_SERVICE);
displayManager.registerDisplayListener(new DisplayManager.DisplayListener() {
public void onDisplayAdded(int displayId) {
public void onDisplayRemoved(int displayId) {
public void onDisplayChanged(int displayId) {
try {
if (displayManager.getDisplay(displayId).getState() == Display.STATE_DOZING) {
Log.d(TAG, "onDisplayChanged: dozing");
} else {
Log.d(TAG, "onDisplayChanged: not dozing");
} catch (NullPointerException exception) {
}, handler);
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Any particular reason why you are catching/ignoring the NullPointerException here?

try {
} catch (NullPointerException e) {

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LouisCAD commented Feb 8, 2016

@kentarosu onDestroy() is the perfect place to unregister 😉

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