Android 使用Fence API获取用户活动的更改
示例
如果要检测用户何时开始或完成活动（例如步行，跑步或该DetectedActivityFence课程的其他任何活动），则可以为要检测的活动创建围栏，并在用户开始/结束时得到通知这项活动。通过使用BroadcastReceiver，您将获得Intent包含活动的数据：
//您自己的动作过滤器，如清单中使用的过滤器。
private static final String FENCE_RECEIVER_ACTION =BuildConfig.APPLICATION_ID+
"FENCE_RECEIVER_ACTION";
private static final String FENCE_KEY = "walkingFenceKey";
private FenceReceiver mFenceReceiver;
private PendingIntent mPendingIntent;
//确保按照“备注”部分所述初始化客户端。
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//等等
//0是标准的活动请求代码，可以根据需要进行更改。
mPendingIntent = PendingIntent.getBroadcast(this, 0,
new Intent(FENCE_RECEIVER_ACTION), 0);
registerReceiver(mFenceReceiver, new IntentFilter(FENCE_RECEIVER_ACTION));
//创建围栏。
AwarenessFence fence = DetectedActivityFence.during(DetectedActivityFence.WALKING);
//注册篱笆以接收回调。
Awareness.FenceApi.updateFences(client, new FenceUpdateRequest.Builder()
.addFence(FENCE_KEY, fence, mPendingIntent)
.build())
.setResultCallback(new ResultCallback<Status>() {
@Override
public void onResult(@NonNull Status status) {
if (status.isSuccess()) {
Log.i(FENCE_KEY, "成功注册。");
} else {
Log.e(FENCE_KEY, "无法注册： " + status);
}
}
});
}
}现在，BroadcastReceiver当用户更改活动时，您可以收到带有的意图以获取回调：
public class FenceReceiver extends BroadcastReceiver {
private static final String TAG = "FenceReceiver";
@Override
public void onReceive(Context context, Intent intent) {
//获取围栏状态
FenceState fenceState = FenceState.extract(intent);
switch (fenceState.getCurrentState()) {
case FenceState.TRUE:
Log.i(TAG, "User is walking");
break;
case FenceState.FALSE:
Log.i(TAG, "User is not walking");
break;
case FenceState.UNKNOWN:
Log.i(TAG, "User is doing something unknown");
break;
}
}
}