FusedLocationProvider使用intentservice进行后台位置更新:当pendingintent添加了一个bundle时,位置更新不起作用

时间:2015-12-08 13:23:04

标签: android location bundle android-pendingintent fusedlocationproviderapi

我一直在寻找这个问题的答案很长一段时间,似乎没有人有答案。

我正在尝试使用Google最新的FusedLocationProviderAPI订阅位置更新。我已经在线学习了教程,它的工作方式是不时地获取我的位置,然后使用requestLocationUpdates触发的intentservice。

继续,我尝试将自定义类对象“User”传递给我的intentservice。此自定义类允许我将位置上载到我的服务器以进行后台位置更新。

我添加自定义对象的方法是向intent添加bundle,然后将其添加到触发IntentService的pendingIntent中。不幸的是,一旦添加了bundle,intentservice就会立即被破坏并返回null。

这是我的代码,在MainActivity中我触发IntentService:

@Override
public void onConnected(Bundle arg0) {

    // This is for creating the intent that is used for handler class
    Intent intent = new Intent(MainActivity.this, MyLocationHandler.class);
    Bundle b = new Bundle();
    b.putParcelable("user", user);
    //intent.putExtras(b);
    intent.putExtra("bundle",b);

    PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(), 0,
            intent, PendingIntent.FLAG_UPDATE_CURRENT);

    // Then the off screen periodic update
    PendingResult pendingResult = LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,
          mLocationRequest, pendingIntent);

    LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);

}

从上面可以看出,我会在intent中添加一个包'b',它被添加到pendingIntent并触发LocationHandler类:

public class MyLocationHandler extends IntentService {

User user;
private String TAG = this.getClass().getSimpleName();

public MyLocationHandler() {
    super("MyLocationHandler");
}


@Override
protected void onHandleIntent(Intent intent) {

     Bundle bundle = intent.getBundleExtra("bundle");
    //Bundle bundle = intent.getExtras();
    if (bundle == null) {
        Log.e(TAG, "bundle is null");
    } else {
        bundle.setClassLoader(User.class.getClassLoader());
    }
    user = (User) bundle.getParcelable("user");

    if (user == null) {
        Log.e(TAG, "user is null");
    }

    if (LocationResult.hasResult(intent)) {
        LocationResult locationResult = LocationResult.extractResult(intent);
        Location location = locationResult.getLastLocation();
        Log.i(TAG, Double.toString(location.getLatitude()) + ", " + Double.toString(location.getLongitude()));

        if (user != null) {
            user.updateLocation(location); // This is a method in the custom class that sends location to the server
        }
    } else
        Log.e(TAG, "Null object returned for location API");
}

每当我尝试添加一个bundle时,location会在LocationHandler类中返回null,但是如果我删除了bundle,则会恢复位置更新。

附上我的清单,以防万一:          

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
<permission android:name="com.example.projecttesting.permission.C2D_MESSAGE"
    android:protectionLevel="signature" />
<uses-permission android:name="com.example.projecttesting.permission.C2D_MESSAGE" />

<uses-feature
    android:glEsVersion="0x00020000"
    android:required="true"/>

<application
    android:allowBackup="true"
    tools:replace="icon, label"
    android:icon="@drawable/ic_launcher"
    android:label="SamePage"
    android:theme="@style/Theme.AppCompat.Light.NoActionBar" >

    <meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/facebook_app_id"/>
    <meta-data
        android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />
    <meta-data
        android:name="com.google.android.geo.API_KEY"
        android:value="AIzaSyCDY8ulp1VGKwGdaRU19G4sfuXsymZGgoY" />


    <activity
        android:name=".LoginActivity" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <activity
        android:name=".MainActivity"
        android:label="@string/app_name" >
    </activity>
    <activity
        android:name=".EventLocationInput"
        android:windowSoftInputMode="adjustPan" />
    <activity android:name=".EventPeopleInput" />
    <activity android:name=".EventCreation"/>
    <service android:enabled="true" android:name=".MyLocationHandler"/>

    <activity android:name="com.facebook.FacebookActivity"
        android:configChanges=
            "keyboard|keyboardHidden|screenLayout|screenSize|orientation"
        android:theme="@android:style/Theme.Translucent.NoTitleBar"
        android:label="@string/app_name" />
    <receiver
        android:name=".GcmBroadcastReceiver"
        android:permission="com.google.android.c2dm.permission.SEND" >
        <intent-filter>
            <action android:name="com.google.android.c2dm.intent.RECEIVE" />
            <category android:name="com.example.projecttesting" />
        </intent-filter>
    </receiver>
    <service android:name=".GcmMessageHandler" />
    <meta-data android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />
</application>

</manifest>

到目前为止,我只看到这里提出的类似问题: Android FusedLocationProviderApi: Incoming intent has no LocationResult or LocationAvailability

这让我发疯了。希望有人能够对此有所了解。

感谢。

1 个答案:

答案 0 :(得分:0)

根据建议,我会在这里发布我的答案。它并没有完全解决我遇到的问题,但我设法通过使用SharedPreferenceManager来存储我需要的另一个活动并在Handler类中检索它。虽然不是最优雅的解决方案,但有效性。如果你需要的东西很小而且不经常改变,这可能是一种解决方法。