@Override
protected void onPause() {
if (mNearbyCapable) {
mDeviceManager.stopSearchingForDevices();
}
super.onPause();
}
@Override
public void onResume() {
super.onResume();
if (mNearbyCapable && PrefUtils.hasEnabledBle(this)) {
mDeviceManager.startSearchingForDevices();
}
}
// Updates the nearby button's text to be the number of devices found. If no devices have been
// found, the text is set to "Nearby".
private void updateNearbyButton() {
int count = mDeviceManager.getAdapter().getCount();
final String text =
(count == 0 ? "" : (String.valueOf(count) + " "))
+ getResources().getString(R.string.map_nearby_button);
if (mNearbyButton != null) {
mNearbyButton.setText(text);
mNearbyButton.setSelected(count > 0);
}
}
@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
private boolean initNearby() {
PackageManager pm = getPackageManager();
if (pm != null && pm.hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
BluetoothManager manager = (BluetoothManager) getSystemService(BLUETOOTH_SERVICE);
BluetoothAdapter adapter = manager.getAdapter();
if (adapter != null) {
MetadataResolver.initialize(this);
mDeviceManager = new NearbyDeviceManager(this, adapter);
mDeviceManager
.getAdapter()
.registerDataSetObserver(
new DataSetObserver() {
@Override
public void onChanged() {
updateNearbyButton();
}
});
return true;
}
}
return false;
}
// Handles a click on the Nearby menu item. Recognizes several states:
// 1. If the NearbyFragment is currently visible, does nothing.
// 2. If the user has not enabled Nearby, presents them with a legalese screen asking them to
// opt in.
// 3. If the device's Bluetooth is disabled, ask the user to enable it.
// 4. Otherwise, shows the fragment.
private void handleNearbyClick() {
final FragmentManager manager = getFragmentManager();
Fragment fragment = manager.findFragmentByTag(NEARBY_FRAGMENT_TAG);
if (fragment != null && fragment.isVisible()) {
return;
}
if (!PrefUtils.hasEnabledBle(this)) {
// If the user has not enabled Nearby, present them with a legalese screen asking them
// to do so.
Intent intent = new Intent(this, NearbyEulaActivity.class);
startActivityForResult(intent, REQUEST_ENABLE_NEARBY);
return;
}
if (!mDeviceManager.isEnabled()) {
// If the user's bluetooth is not enabled, ask them politely to turn it on. Beginning
// to search for devices should happen in onStart?
DialogFragment dialogFragment = new EnableBluetoothDialogFragment();
dialogFragment.show(getFragmentManager(), "EnableBluetoothDialogFragment");
return;
}
// Otherwise, the user has opted into BLE and their Bluetooth device is turned on!
showNearbyFragment(NEARBY_FRAGMENT_TAG);
}