如何使用Android以节能的方式接收驾驶启动和停止活动，甚至可以离线工作?

Question

我希望收到 Android 位置回调，用于驾驶启动和停止。我已经尝试了谷歌的活动检测API，但它似乎不够可靠。此外，我已经考虑使用 Neura 的 API 来检测位置事件，但它仅在设备在线时才有效，这在我的情况下是不够的。

Answer 1

您可以使用Google的FenceApi来声明行车围栏。

虽然这种方法看起来不错，但我面对的事实是，这个 api 有时不会告诉我用户何时开始/完成驾驶，有时在我开始驾驶后需要很长时间，API 才会告诉我该事件。

a. 包含对应用的 build.gradle 文件的依赖关系：

compile 'com.google.android.gms:play-services-location:+'
compile 'com.google.android.gms:play-services-contextmanager:+'

b. 清单定义：

<uses-permission android:name="com.google.android.gms.permission.ACTIVITY_RECOGNITION" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme" >
<meta-data
android:name="com.google.android.awareness.API_KEY"
android:value="PUT_YOUR_AWARENESS_KEY_HERE" />
<activity android:name=".MainActivity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
PUT_YOUR_AWARENESS_KEY_HERE : You need to generate a key here.

三.您的 MainActivity 类 - 附加到代码的解释：

public class MainActivity extends Activity {
private GoogleApiClient mGoogleApiClient;
private PendingIntent mPendingIntent;
private FenceReceiver mFenceReceiver;
// The intent action which will be fired when your fence is triggered.
private final String FENCE_RECEIVER_ACTION = BuildConfig.APPLICATION_ID + "FENCE_RECEIVER_ACTION";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mGoogleApiClient = new GoogleApiClient.Builder(this).addApi(Awareness.API).build();
mGoogleApiClient.connect();
// Set up the PendingIntent that will be fired when the fence is triggered.
mPendingIntent = PendingIntent.getBroadcast(this, 0, new Intent(FENCE_RECEIVER_ACTION), 0);
// The broadcast receiver that will receive intents when a fence is triggered.
mFenceReceiver = new FenceReceiver();
registerReceiver(mFenceReceiver, new IntentFilter(FENCE_RECEIVER_ACTION));
createFence(DetectedActivityFence.IN_VEHICLE, "InVehicleFence");
}
@Override
public void onDestroy() {
try {
unregisterReceiver(mFenceReceiver); //Don't forget to unregister the receiver
} catch (Exception e) {
e.printStackTrace();
}
super.onDestroy();
}
private void createFence(int detectedActivityFence, final String fenceKey) {
AwarenessFence fence = DetectedActivityFence.during(detectedActivityFence);
// Register the fence to receive callbacks.
Awareness.FenceApi.updateFences(
mGoogleApiClient, new FenceUpdateRequest.Builder().addFence(fenceKey, fence, mPendingIntent)
.build()).setResultCallback(new ResultCallback<Status>() {
@Override
public void onResult(@NonNull Status status) {
if (status.isSuccess()) {
Log.i(getClass().getSimpleName(), "Successfully registered.");
} else {
Log.e(getClass().getSimpleName(), "Could not be registered: " + status);
}
}
});
}
// Handle the callback on the Intent.
public class FenceReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
FenceState fenceState = FenceState.extract(intent);
switch (fenceState.getCurrentState()) {
case FenceState.TRUE:
Log.i(fenceState.getFenceKey(), "Driving");
break;
case FenceState.FALSE:
Log.i(fenceState.getFenceKey(), "Not driving");
break;
}
}
}

}