[英]Android - Unable to receive local broadcast in my activity from service
我有启动服务(位置服务)的主要活动,我希望该服务在每次找到新位置时广播新位置。
多亏了日志,我知道该服务正在运行,并且每隔几秒钟我就有新的位置,但我从未收到广播。
主活动.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();
}
}
CMB广播接收器.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!");
}
}
}
定位服务.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");
}
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>
我在日志中可以看到“已发送广播”但我从未收到“已接收广播”
任何帮助将不胜感激。
编辑:
按照 Shaishav 的建议,编辑了如何在定位服务中创建意图。
还是不行。
LocalBroadcastManager
不能跨进程工作。 您的Service
正在一个单独的进程中运行。
您可以在与Activity
相同的进程中运行您的Service
- 通过从<service>
元素中删除process
属性 - 或者使用某种 IPC 代替 - 例如,通过在Context
而不是LocalBroadcastManager
上发送和接收广播。
在您的LocationService
,使用以下方法发送本地广播:
Intent intent = new Intent(CMBroadcastReceiver.RECEIVE_LOCATION_UPDATE);
LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
<service android:name=".LocationService" android:process=":location_service" />
您的服务与活动处于不同的流程中。 LocalBroadcastManager
仅用于一个进程。 要么从<service>
删除android:process
,要么使用一些 IPC 机制(例如,系统广播,适当保护)。
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