从服务发送意图活动 [英] send intent from service to activity
问题描述
我想从 IntentSerivce 到 mainactivity 使用意图，但我可以返回结果弄不明白的工作。
该 IntentService 接收到来自活动的意图没有问题，做它的事，得到了 JSONstring 。现在唯一剩下的问题是这个字符串发回的活动。
下面是在mainactivity方法：
公共字符串RTConn（查询字符串）{
的System.out.println（查询烂番茄。）;
意图rtIntent =新的意图（MainActivity.this，RTConnection.class）;
rtIntent.putExtra（查询，查询）;
bindService（rtIntent，RTConnection，Context.BIND_AUTO_CREATE）;
startService（rtIntent）;
JSON字符串= getIntent（）getStringExtra（JSON）。
返回JSON;
这里是IntentService：
公共无效ONSTART（意向意图，诠释startId）{
的System.out.println（意图收到）;
字符串jsonString = rottenTomatoesSearch（intent.getStringExtra（查询））;
意图RTRetur =新的意图（RTConnection.this，MainActivity.class）;
RTRetur.putExtra（JSON，jsonString）;
startActivity（RTRetur）;
}
显然startActivity不工作，但还有什么用？ （我宁可不使用广播接收器）。 此致彼得·L;
更新
这是怎么了MainActivity看起来大气压：
公共静态最后弦乐RECEIVE_JSON =student.kau.RECEIVE_JSON;
私人的BroadcastReceiver RTReceiver =新的BroadcastReceiver（）{
@覆盖
公共无效的onReceive（上下文的背景下，意图意图）{
的System.out.println（广播收稿日期：+ intent.getAction（））;
如果（intent.getAction（）。等于（RECEIVE_JSON））{
的System.out.println（JSON收到。）;
串serviceJsonString = intent.getStringExtra（JSON）;
}
}
};
这code是的onCreate：
LocalBroadcastManager bManager = LocalBroadcastManager.getInstance（本）;
IntentFilter的IntentFilter的=新的IntentFilter（）;
intentFilter.addAction（RECEIVE_JSON）;
bManager.registerReceiver（RTReceiver，IntentFilter的）;
这是方法：
公共无效ONSTART（意向意图，诠释startId）{
的System.out.println（意图收到）;
查询字符串= intent.getStringExtra（查询）;
串jsonString = rottenTomatoesSearch（查询）;
的System.out.println（抓取，做）;
意图RTRetur =新的意图（MainActivity.RECEIVE_JSON）;
的System.out.println（行动：+ RTRetur.getAction（））;
RTRetur.putExtra（JSON，jsonString）;
sendBroadcast（RTRetur）;
}
在logcat中的最后一丝的的System.out.println（行动：+ RTRetur.getAction（））;
清议：
student.kau.RECEIVE_JSON
对于这一点，你可以使用<一个href="http://developer.android.com/reference/android/content/BroadcastReceiver.html"><$c$c>BroadcastReceiver在活动。
这里是一个很好的例子我用以服务之间连续通信＆LT;> 活动使用 BroadcastReceivers
<一个href="http://stackoverflow.com/questions/4300291/example-communication-between-activity-and-service-using-messaging">Here为服务℃之间沟通的另一个很好的例子;>活动。它使用使者和 IncomingHandler 。
的BroadcastReceiver
我会做一个简单的例子对你的情况。
这是你的BroadcastReceiver为您的活动。这将是收到您的字符串：
//你的活动将这一动作字符串回应
公共静态最后弦乐RECEIVE_JSON =com.your.package.RECEIVE_JSON;
私人的BroadcastReceiver bReceiver =新的BroadcastReceiver（）{
@覆盖
公共无效的onReceive（上下文的背景下，意图意图）{
如果（intent.getAction（）。等于（RECEIVE_JSON））{
串serviceJsonString = intent.getExtra（JSON）;
//做些什么字符串
}
}
}
在你的的onCreate（）活动的
LocalBroadcastManager bManager = LocalBroadcastManager.getInstance（本）;
IntentFilter的IntentFilter的=新的IntentFilter（）;
intentFilter.addAction（RECEIVE_JSON）;
bManager.registerReceiver（bReceiver，IntentFilter的）;
最后，在你的服务ONSTART（），做到这一点：
的System.out.println（意图收到）;
字符串jsonString = rottenTomatoesSearch（intent.getStringExtra（查询））;
意图RTRetur =新的意图（YourActivity.RECEIVE_JSON）;
RTRetur.putExtra（JSON，jsonString）;
LocalBroadcastManager.getInstance（本）.sendBroadcast（RTReturn）;
和你的活动会收到与JSON的意图在里面作为一个额外的
I'm trying to return the result from an IntentSerivce to the mainactivity using an intent, but I can't get it to work.
The IntentService receives the intent from the activity without a problem, does it's thing and gets a JSONstring. Now the only problem left is to send this String back to the activity.
Here is the method in the mainactivity:
public String RTConn(String query){
System.out.println("Querying Rotten Tomatoes.");
Intent rtIntent = new Intent(MainActivity.this, RTConnection.class);
rtIntent.putExtra("query", query);
bindService(rtIntent, RTConnection, Context.BIND_AUTO_CREATE);
startService(rtIntent);
String json = getIntent().getStringExtra("json");
return json;
And here is the IntentService:
public void onStart(Intent intent, int startId){
System.out.println("intent Received");
String jsonString = rottenTomatoesSearch(intent.getStringExtra("query"));
Intent RTRetur = new Intent(RTConnection.this, MainActivity.class);
RTRetur.putExtra("json", jsonString);
startActivity(RTRetur);
}
Obviously the startActivity isn't working, but what else is there to use? (I would rather not use a broadcast receiver). Regards Peter L.
Update
this it how the MainActivity looks atm:
public static final String RECEIVE_JSON = "student.kau.RECEIVE_JSON";
private BroadcastReceiver RTReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
System.out.println("broadcast Received: "+intent.getAction());
if(intent.getAction().equals(RECEIVE_JSON)){
System.out.println("JSON Received.");
String serviceJsonString = intent.getStringExtra("json");
}
}
};
This code is the onCreate:
LocalBroadcastManager bManager = LocalBroadcastManager.getInstance(this);
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(RECEIVE_JSON);
bManager.registerReceiver(RTReceiver, intentFilter);
This is the method:
public void onStart(Intent intent, int startId){
System.out.println("intent Received");
String query = intent.getStringExtra("query");
String jsonString = rottenTomatoesSearch(query);
System.out.println("Fetching done");
Intent RTRetur = new Intent(MainActivity.RECEIVE_JSON);
System.out.println("action: "+RTRetur.getAction());
RTRetur.putExtra("json", jsonString);
sendBroadcast(RTRetur);
}
The last trace in logcat is the System.out.println("action: "+RTRetur.getAction()");
-action:
student.kau.RECEIVE_JSON
For this, you can use a BroadcastReceiver in your Activity.
Here is a great example I use to communicate continuously between Service <> Activity using BroadcastReceivers.
Here is another great example of communication between Service <> Activity. It uses Messenger and IncomingHandler.
BroadcastReceiver
I will make a quick example for your case.
This is your BroadcastReceiver for your Activity. It is going to receive your String:
//Your activity will respond to this action String
public static final String RECEIVE_JSON = "com.your.package.RECEIVE_JSON";
private BroadcastReceiver bReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if(intent.getAction().equals(RECEIVE_JSON)) {
String serviceJsonString = intent.getExtra("json");
//Do something with the string
}
}
}
In your onCreate() of the activity
LocalBroadcastManager bManager = LocalBroadcastManager.getInstance(this);
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(RECEIVE_JSON);
bManager.registerReceiver(bReceiver, intentFilter);
And finally, in your Service onStart(), do this:
System.out.println("intent Received");
String jsonString = rottenTomatoesSearch(intent.getStringExtra("query"));
Intent RTRetur = new Intent(YourActivity.RECEIVE_JSON);
RTRetur.putExtra("json", jsonString);
LocalBroadcastManager.getInstance(this).sendBroadcast(RTReturn);
and your Activity will receive the intent with that json in it as an extra
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