我是 Android Wear 操作系统的新手。我想将数字数据 (0,1,2,3,...,9) 公开给 Android Smartwatch 的数据字段（手动触发而不点击数据字段）。
如此处所述，
https://developer.android.com/codelabs/data-providers#0
我已经实现了 onReceive() / onComplicationUpdate() 方法：
public class ComplicationTapBroadcastReceiver extends BroadcastReceiver {
private static final String EXTRA_PROVIDER_COMPONENT =
"com.example.android.wearable.watchface.provider.action.PROVIDER_COMPONENT";
private static final String EXTRA_COMPLICATION_ID =
"com.example.android.wearable.watchface.provider.action.COMPLICATION_ID";
static final int MAX_NUMBER = 20;
static final String COMPLICATION_PROVIDER_PREFERENCES_FILE_KEY =
"com.example.android.wearable.watchface.COMPLICATION_PROVIDER_PREFERENCES_FILE_KEY";
@Override
public void onReceive(Context context, Intent intent) {
Bundle extras = intent.getExtras();
ComponentName provider = extras.getParcelable(EXTRA_PROVIDER_COMPONENT);
int complicationId = extras.getInt(EXTRA_COMPLICATION_ID);
// Retrieve data via SharedPreferences.
String preferenceKey = getPreferenceKey(provider, complicationId);
SharedPreferences sharedPreferences =
context.getSharedPreferences(COMPLICATION_PROVIDER_PREFERENCES_FILE_KEY, 0);
int value = sharedPreferences.getInt(preferenceKey, 0);
// Update data for complication.
value = (value + 1) % MAX_NUMBER;
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putInt(preferenceKey, value);
editor.apply();
// Request an update for the complication that has just been tapped.
ProviderUpdateRequester requester = new ProviderUpdateRequester(context, provider);
requester.requestUpdate(complicationId);
}
/**
* Returns a pending intent, suitable for use as a tap intent, that causes a complication to be
* toggled and updated.
*/
static PendingIntent getToggleIntent(
Context context, ComponentName provider, int complicationId) {
Intent intent = new Intent(context, ComplicationTapBroadcastReceiver.class);
intent.putExtra(EXTRA_PROVIDER_COMPONENT, provider);
intent.putExtra(EXTRA_COMPLICATION_ID, complicationId);
// Pass complicationId as the requestCode to ensure that different complications get
// different intents.
return PendingIntent.getBroadcast(
context, complicationId, intent, PendingIntent.FLAG_UPDATE_CURRENT);
}
/**
* Returns the key for the shared preference used to hold the current state of a given
* complication.
*/
static String getPreferenceKey(ComponentName provider, int complicationId) {
return provider.getClassName() + complicationId;
}
}
public class CustomComplicationProviderService extends ComplicationProviderService {
private static final String TAG = "ComplicationProvider";
/*
* Called when a complication has been activated. The method is for any one-time
* (per complication) set-up.
*
* You can continue sending data for the active complicationId until onComplicationDeactivated()
* is called.
*/
@Override
public void onComplicationActivated(
int complicationId, int dataType, ComplicationManager complicationManager) {
Log.d(TAG, "onComplicationActivated(): " + complicationId);
}
/*
* Called when the complication needs updated data from your provider. There are four scenarios
* when this will happen:
*
* 1. An active watch face complication is changed to use this provider
* 2. A complication using this provider becomes active
* 3. The period of time you specified in the manifest has elapsed (UPDATE_PERIOD_SECONDS)
* 4. You triggered an update from your own class via the
* ProviderUpdateRequester.requestUpdate() method.
*/
@Override
public void onComplicationUpdate(
int complicationId, int dataType, ComplicationManager complicationManager) {
Log.d(TAG, "onComplicationUpdate() id: " + complicationId);
// Create Tap Action so that the user can trigger an update by tapping the complication.
ComponentName thisProvider = new ComponentName(this, getClass());
// We pass the complication id, so we can only update the specific complication tapped.
PendingIntent complicationPendingIntent =
ComplicationTapBroadcastReceiver.getToggleIntent(
this, thisProvider, complicationId);
// Retrieves your data, in this case, we grab an incrementing number from SharedPrefs.
SharedPreferences preferences =
getSharedPreferences(
ComplicationTapBroadcastReceiver.COMPLICATION_PROVIDER_PREFERENCES_FILE_KEY,
0);
int number =
preferences.getInt(
ComplicationTapBroadcastReceiver.getPreferenceKey(
thisProvider, complicationId),
0);
String numberText = String.format(Locale.getDefault(), "%d!", number);
ComplicationData complicationData = null;
switch (dataType) {
case ComplicationData.TYPE_SHORT_TEXT:
complicationData =
new ComplicationData.Builder(ComplicationData.TYPE_SHORT_TEXT)
.setShortText(ComplicationText.plainText(numberText))
.setTapAction(complicationPendingIntent)
.build();
break;
case ComplicationData.TYPE_LONG_TEXT:
complicationData =
new ComplicationData.Builder(ComplicationData.TYPE_LONG_TEXT)
.setLongText(ComplicationText.plainText("Number: " + numberText))
.setTapAction(complicationPendingIntent)
.build();
break;
case ComplicationData.TYPE_RANGED_VALUE:
complicationData =
new ComplicationData.Builder(ComplicationData.TYPE_RANGED_VALUE)
.setValue(number)
.setMinValue(0)
.setMaxValue(ComplicationTapBroadcastReceiver.MAX_NUMBER)
.setShortText(ComplicationText.plainText(numberText))
.setTapAction(complicationPendingIntent)
.build();
break;
default:
if (Log.isLoggable(TAG, Log.WARN)) {
Log.w(TAG, "Unexpected complication type " + dataType);
}
}
if (complicationData != null) {
complicationManager.updateComplicationData(complicationId, complicationData);
} else {
// If no data is sent, we still need to inform the ComplicationManager, so the update
// job can finish and the wake lock isn't held any longer than necessary.
complicationManager.noUpdateRequired(complicationId);
}
}
/*
* Called when the complication has been deactivated.
*/
@Override
public void onComplicationDeactivated(int complicationId) {
Log.d(TAG, "onComplicationDeactivated(): " + complicationId);
}
}
代码正在运行，但是...
a) 如何在不点击智能手表的数据字段的情况下，用我的传感器信息更新智能手表数据字段的显示？甚至可能吗？
b) 我必须如何配置 AndroidManifest.xml，以及如何在我的 Java 应用程序中实现 ProviderUpdateRequester 方法 requestUpdateAll() 以手动触发显示更新？
new ProviderUpdateRequester(context, new ComponentName(context, "myComplicationClass"))
.requestUpdateAll();
就我而言，什么是“上下文”，什么是“myComplicationClass”？
不幸的是，我还没有找到任何好的代码示例......