Android Activity 识别不适用于 Nexus 5

Question

我有一段使用谷歌 Activity 识别更新的代码。现在突然间，这些似乎每秒发送几次更新，或者尽管每 20 秒请求一次，但从不发送更新。我没有更改代码并检查了早期版本，但遇到了同样的问题。

我根据教程构建了一个最小示例，但我的 Nexus 5 设备也没有获得任何 Activity 更新。使用我的 HTC Desire(基于 Android 2.3.7 的 MildWild 5.0)，它运行得非常好。我怀疑是 Google Play 服务，但两部手机都安装了 4.2.43 版本

主要 Activity :

package com.example.testactivities;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.view.Menu;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesClient.ConnectionCallbacks;
import com.google.android.gms.common.GooglePlayServicesClient.OnConnectionFailedListener;
import com.google.android.gms.location.ActivityRecognitionClient;

public class MainActivity extends FragmentActivity implements
ConnectionCallbacks, OnConnectionFailedListener {
    // Constants that define the activity detection interval
    public static final int MILLISECONDS_PER_SECOND = 1000;
    public static final int DETECTION_INTERVAL_SECONDS = 1;
    public static final int DETECTION_INTERVAL_MILLISECONDS = 
            MILLISECONDS_PER_SECOND * DETECTION_INTERVAL_SECONDS;
    /*
     * Store the PendingIntent used to send activity recognition events
     * back to the app
     */
    private PendingIntent mActivityRecognitionPendingIntent;
    // Store the current activity recognition client
    private ActivityRecognitionClient mActivityRecognitionClient;
    // Flag that indicates if a request is underway.
    private boolean mInProgress;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        /*
         * Instantiate a new activity recognition client. Since the
         * parent Activity implements the connection listener and
         * connection failure listener, the constructor uses "this"
         * to specify the values of those parameters.
         */
        mActivityRecognitionClient =
                new ActivityRecognitionClient(this, this, this);
        /*
         * Create the PendingIntent that Location Services uses
         * to send activity recognition updates back to this app.
         */
        Intent intent = new Intent(
                this.getApplicationContext(), ActivityRecognitionIntentService.class);
        /*
         * Return a PendingIntent that starts the IntentService.
         */
        mActivityRecognitionPendingIntent =
                PendingIntent.getService(this, 0, intent,
                PendingIntent.FLAG_UPDATE_CURRENT);
        // Start with the request flag set to false
        mInProgress = false;
        this.startUpdates();
    }

    /**
     * Request activity recognition updates based on the current
     * detection interval.
     *
     */
     public void startUpdates() {
        // If a request is not already underway
        if (!mInProgress) {
            // Indicate that a request is in progress
            mInProgress = true;
            // Request a connection to Location Services
            mActivityRecognitionClient.connect();
        //
        } else {
            /*
             * A request is already underway. You can handle
             * this situation by disconnecting the client,
             * re-setting the flag, and then re-trying the
             * request.
             */
        }
    }

     /*
      * Called by Location Services once the location client is connected.
      *
      * Continue by requesting activity updates.
      */
     @Override
     public void onConnected(Bundle dataBundle) {
         Log.v("EXAMPLE","connected");
         /*
          * Request activity recognition updates using the preset
          * detection interval and PendingIntent. This call is
          * synchronous.
          */
         mActivityRecognitionClient.requestActivityUpdates(
                 DETECTION_INTERVAL_MILLISECONDS,
                 mActivityRecognitionPendingIntent);
         /*
          * Since the preceding call is synchronous, turn off the
          * in progress flag and disconnect the client
          */
         mInProgress = false;
         mActivityRecognitionClient.disconnect();
     }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public void onConnectionFailed(ConnectionResult arg0) {
        Log.v("EXAMPLE","Connection failed");

    }

    @Override
    public void onDisconnected() {
        Log.v("EXAMPLE","Disconnected");
    }

}

list :

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.testactivities"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="10"
        android:targetSdkVersion="19" />
    <uses-permission android:name="com.google.android.gms.permission.ACTIVITY_RECOGNITION"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />
        <activity
            android:name="com.example.testactivities.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service
            android:name="com.example.testactivities.ActivityRecognitionIntentService"/>
    </application>

</manifest>

识别 Intent 服务:

package com.example.testactivities;

import android.app.IntentService;
import android.content.Intent;
import android.util.Log;

public class ActivityRecognitionIntentService extends IntentService {

    public ActivityRecognitionIntentService() {
        super("ActivityRecognitionIntent");
        Log.v("EXAMPLE","constructor");
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        Log.v("EXAMPLE","new activity update");
    }

}

更新:我相信 canopi 发现了正确的问题。当设备仍然具有高置信度时，它根本不会触发识别 Intent 。这与一年前(在其他设备上)完全不同。为了检测设备是否仍在运行，我记录了最后一个传入的 Activity 及其时间戳，并定期检查。旧的时间戳表示设备在该时间一直处于静止状态。

Answer 1

我建议您增加检测间隔，传感器至少需要 6 到 7 秒才能检测到您的 Activity 变化。此外，我观察到如果设备静止一段时间，ActivityRecognition 会停止触发 Intent 。当设备再次运动时，它们会立即被触发。