Question

我的主要活动是启动服务（位置服务），我希望每次找到新位置时，该服务都会广播新位置。

感谢日志，我知道服务正在运行，我每隔几秒左右就有新的位置，但我从来没有接收过广播。

MainActivity.java

public class MainActivity extends Activity {


private static final String TAG = "mainActivity";

private CMBroadcastReceiver mMessageReceiver = new CMBroadcastReceiver();

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {

    // Start Service
    startService(new Intent(this, LocationService.class));

    super.onCreate(savedInstanceState);
}

@Override
public void onResume()
{
    LocalBroadcastManager.getInstance(this).registerReceiver(
            mMessageReceiver, new IntentFilter(CMBroadcastReceiver.RECEIVE_LOCATION_UPDATE));
    super.onResume();
}

@Override
public void onPause()
{
    LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver);
    super.onPause();
}
}

CMBroadcastReceiver.java

public class CMBroadcastReceiver extends BroadcastReceiver {

private static final String TAG = "CMBroadcastReceiver";

public static final String RECEIVE_LOCATION_UPDATE = "LOCATION_UPDATES";

@Override
public void onReceive(Context context, Intent intent) {
    Log.i(TAG, "Received broadcast");
    String action = intent.getAction();
    if (action.equals(RECEIVE_LOCATION_UPDATE))
    {
        Log.i(TAG, "Received location update from service!");
    }
}
}

LocationService.java

/**
 * Callback that fires when the location changes.
 */
@Override
public void onLocationChanged(Location location) {
    mCurrentLocation = location;
    mLastUpdateTime = DateFormat.getTimeInstance().format(new Date());
    Log.i(TAG, "onLocationChanged " + location);

    Intent intent = new Intent(CMBroadcastReceiver.RECEIVE_LOCATION_UPDATE);
    LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
    Log.i(TAG, "Broadcast sent");
}

的AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.cyclemapapp.gpstracker">

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity
        android:name=".MainActivity"
        android:label="@string/title_activity_main"
        android:theme="@style/AppTheme.NoActionBar">
        android:configChanges="orientation|screenSize">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <service android:name=".LocationService" android:process=":location_service" />
</application>

我可以看到日志＆＃34; Broadcast Sent＆＃34;但我从来没有收到＆＃34; Broadcast Received＆＃34;

非常感谢任何帮助。

编辑：

编辑Shaishav建议如何在位置服务中创建意图。

仍然无法工作。

Answer 1

=Switch(Fields!Orders.Value < 100, "Red", Fields!Orders.Value < 500, "Green")不适用于各个流程。您的LocalBroadcastManager正在单独的流程中运行。

您可以在与Service相同的过程中运行Service - 从Activity元素中移除process属性 - 或者使用某种IPC代替 - 例如，通过<service>而不是Context发送和接收广播。

Answer 2

在LocationService中，使用以下方式发送本地广播：

Intent intent = new Intent(CMBroadcastReceiver.RECEIVE_LOCATION_UPDATE);
LocalBroadcastManager.getInstance(this).sendBroadcast(intent);

Answer 3

<service android:name=".LocationService" android:process=":location_service" />

您的服务与活动分开。 LocalBroadcastManager仅用于一个进程。从android:process中删除<service>，或使用某种IPC机制（例如，系统广播，正确保护）。

Android - 无法通过服务在我的活动中接收本地广播

3 个答案: