Android :: Passing Arguments To A BroadcastReceiver Through An Intent
Jan 14, 2010
I have an application, which sets an alarm using AlarmManager, which starts another Activity when it goes off. The AlarmManager takes a PendingIntent and spawns a BroadcastReceiver class when the specified time comes. I'm wondering whether there is any way that I can pass arguments to this BroadcastReceiver through the Intent object which goes into PendingIntent?I'd like to be able to retrieve arg1 in the BroadcastReceiver's onReceive(Context, Intent) method. I figured that the local variable my_intent would be the second parameter passed on to onReceive by the PendingIntent, but apparently that's not quite right. Is it possible to pass parameters between an Activity and a BroadcastReceiver in this fashion (using Intent.putExtra()) or should I use a ContentProvider instead?
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Sep 27, 2010
i searched the net to find something about how to pass arguments to JSON c# .net web service, but i didn't find anything useful for me. I have to pass arguments like GUID or at least Username and Password. Is params.put("var", ""); the right thing? How do i pass multiple parameters like this, let's say username and password?
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Feb 12, 2010
Is it possible to tell Eclipse to use some extra arguments for aapt (-0 in specific)?I have been looking for past couple of hours and the best hack I came up with was to create a wrapper for the aapt tool to inject the argument to the command line. The trouble with this approach is that whenever I should lose that wrapper, then I'll be quietly introducing a bug into my application.
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Nov 16, 2010
I think this should be easy to answer. I have an application that does some long calculations, and I would like to show a progress dialog while this is done. So far I have found that I could do this with threads/handlers, but didn't work, and then I found out about the AsyncTask.In my application I use maps with markers on it, and I have implemented the onTap function to call a method that I have defined. The method creates a dialog with Yes/No buttons, and I would like to call an AsyncTask if Yes is clicked. My question is how to pass an ArrayList to the AsyncTask (and work with it there), and how to get back a new ArrayList like a result from the AsyncTask?
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May 16, 2010
I'm writing an application that starts with a loading activity. In the loading activity the app requests html from web and parses the html, then it sends the parsing result to the main activity. The main activity has several tabs, and contents of these tabs are based on the result of parsing.For example, the result of parsing is a list of strings ["apple", "banana", "orange"], and I need to pass this list to main activity, so that the main activity can create three tabs named after three fruits.I would like to know if there is any way to pass a list of strings among activities, BTW, is it the common way of do this?
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Sep 1, 2009
My current problem is that I don't receive an intent. I have a BroadcastReceiver and defined in the AndroidManifest.xml file that it also should receive intents with these actions.
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Jan 12, 2010
I have a BroadcastReceiver which never enters onReceive(), so to debug I created a bare bones project with a simple BroadcastReceiver and still it never gets the BOOT_COMPLETED intent (see manifest below).
I do see a lot of warnings/errors in my Eclipse log (filtered and after manifest) which didn't seem to cause issues before, but maybe I have a bad install of the emulator? I have all the latest SDK and plugins. I also noticed that when I run the emulator I always get "Waiting for" popup for either Alarm or MMS.
The debugger attaches normally for my main Activity, it's just this "boot" receiver that never seems to start. I've tried using "com.boottest.BootReceiver" instead of".BootReceiver" to no avail.
CODE:......................
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Aug 18, 2010
I have 2 Activities that need to communicate with each other: ActivityA and ActivityB
Say that ActivityA opens ActivityB. How do I unicast a message from ActivityB to ActivityA without closing ActivityB?
Here's what I tried: setResult() - but the intent will be delivered only when ActivityB closes sendBroadcast() - but this sends the intent to everyone listening to the action.
I only want the action to reach ActivityA since it spawned ActivityB.
I tried having ActivityA registering a BroadCast receiver, but I cannot target that via Intent's SetComponentName(). startActivity() - this brings up ActivityA, which I don't want.
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Oct 14, 2010
I have four groups in a listview each with four url's I want to load in a webView. When the user select a url to goto I set a value like so;
if (position == 0) webb = webb +2;
{
Intent intent = new Intent(this, official.class);
startActivity(intent);
}
I then carryout the intent to move to the webView class where I have given each URL a value like so;
if (webb == 2) mWebView.loadUrl("http://yahoo.com");
if (webb == 3) mWebView.loadUrl("http://www.bbc.co.uk");
But the screen stays blank, if I state the value inside the official.class it works. How can I get this value to pass to another class based on the selection the user makes from the listview.
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Oct 16, 2010
I have been trying to get "getExtra" to work but without success, I have a listview with 4 choices which launch a webpage within a webView class, when the user selects the option lets say option 3 I want to pass the value of 3 to the webView class so that it will load the correct webpage, at the moment I get no errors, but the app force closes when I select the option, could this be due to having to announce this in the manifest? can somebody help with where I am going wrong. This is my intent
public void onListItemClick(ListView l, View v, int position, long id) {
if (position == 0) {
Intent intent = new Intent(this, official.class);
intent.putExtra("weburl", 3);
startActivity(intent);}
This is the official class:
public class official extends Activity {
int number = getIntent().getIntExtra("weburl", 0);
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && mWebView.canGoBack()) {
mWebView.goBack();
return true;
} return super.onKeyDown(keyCode, event);
} WebView mWebView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.browser1);
mWebView = (WebView) findViewById(R.id.webview);
mWebView.getSettings().setJavaScriptEnabled(true);
if (number == 2) mWebView.loadUrl("http://bcafc.livewwware.co.uk");
if (number == 3) mWebView.loadUrl("http://www.bbc.co.uk");
mWebView.setWebViewClient(new HelloWebViewClient());
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Sep 22, 2009
I am creating a database driven app for managing people. I am showing a list of people with each name in a TextView. When a TextView is clicked, I launch a new intent to show the detail for the person. My question: What's the best practices for passing the id of the person to the new intent? The TextView is displaying the name of the person, so how do I know the id of the person? Once I know the id, I know how to pass it to the new intent, but I don't know what the best way to associate the id of the person to the TextView. Is there a best practice for this?
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Jun 28, 2010
I would like to create some home screen app widgets that are entry points into an application. I can put a button in the app widget that uses setOnClickPendingIntent to start the activity. The problem occurs when I want to have two of these app widgets that are entry points to different parts of the activity. I need to be able to pass data into the activity that will distinguish these. Since both app widgets use a Pending Intent that starts the same activity, the two Pending Intents are shared and I can't reliably set extras for the corresponding intents.
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Oct 5, 2010
I would like to pass a considerable sized amount of data (~1500 bytes) between two applications in Android where performance and resource allocation is a priority. The data is basically key-value pairs. The rate at which it needs to be passed from one application to another can vary from a trickle to ~50 packets within a second. I figure I can either:
Wrap all the data inside a bundle, and pass the bundle via an Intent from one application to another. I worry about the performance implications of allocating and de-allocating all that memory to store the bundles.
Write all the data to a SQLite database and provide it to the other application via a content provider. Here I worry about the performance implications of writing all that data to disk, and then having to read it back from disk when it is requested. So, which is the lesser of two evils?
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Aug 30, 2010
I've always been under the assumption that you can't pass arrays between activities with extras. But I was just going through the Bundle class docs and saw putStringArray(String key, String[] value) and public String[] getStringArray (String key). Are these new? They both say since API lvl 1, but I don't remember being able to pass arrays.
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Jan 30, 2009
After generating ADT 0.9, using Cupcake SDk, i need to specify a sdcard to emulator, in eclipse. In ADT 0.8 there is a field in Run Configuration, but in ADT 0.9 no. How can i do that?
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Jun 12, 2010
I'm very new to java and am working on my first Android app. I am using the webview demo as a template. I am trying to generate a random integer between 1 and 12 and then call a certain javascript function based on the result. Here's what I have:
int number = 1 + (int)(Math.random() * ((12 - 1) + 1));
number = (int) Math.floor(number);
String nextQuote = "javascript:wave" + number + "()";
mWebView.loadUrl(nextQuote);
So mWebView.loadUrl(nextQuote) will be the same as something like mWebView.loadUrl("javascript:wave1()") I just want to know if what I have here is correct and will work the way I think it will. The application isn't responding as expected and I suspect this bit of code is the culprit.
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Dec 17, 2009
I have a string defined in my String.xml file that uses format arguments, i.e.: <string name="myString">Hello %1$s.</string> Is there a way to assign a value to the format argument in a layout xml file?
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Jul 31, 2010
I have read that in order to clear data stored in the Android emulator I should start the emulator with the "-wipe-data" arguments. However, I can't see how to specify startup arguments. I have read that it should be possible to specify these in the "Target" tab of the Debug Configurations dialog. However, if I open Debug Configurations from the Eclipse Run menu all I see in the Target tab are radio buttons for "Manual" or "Automatic" Deployment Target Selection Mode, buttons for "Refresh" and "Manager..." and drop-down boxes for "Network Speed" and "Network Latency" options. There are buttons for "Details..." and "Start..." but these are grey. I can't see anywhere where I can enter a "-wipe-data" option. The Run Configurations dialog seems to be identical. (I am using Eclipse SDK 3.5.2)
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Mar 5, 2010
I am writing my own sms receiver app and i want it to catch all the sms using a broadcast receiver. This on its own, is no problem, but i want to be able to stop the message being passed to the messaging app.
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Apr 7, 2009
My use case is to launch one of settings app screen when I receive a certain event in idle state. For which, I added my new intent to PhoneAppBroadcastReceiver() in PhoneApp.java (looks like this receiver handles the misc intents) But when i call startActivity(), The phone seems to go into a panic ex. startActivity(new Intent(this, NetworkSetting.class)); My questions are is this the right approach to go about ? If so 1. How can I launch the activity inside of broadcastReceiver? secondly 2. How do i verify if the activity i want to start is already started?Can the NEW_TASK_LAUNCH be used to verify this ,
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Sep 21, 2010
I have written an application to read all incoming SMS and if the SMS contains certain string, I will also send a copy of the message to my another phone for backup purposes.
I used the reference from the following website:
http://www.anddev.org/novice-tutorials-f8/recognize-react-on-incoming...
It uses BroadcastReceiver to get the incoming SMS, but when I tried to send it using the following method:
CODE:.............
It always crashes. Any idea how to resolve it? Is it because of using BroadcastReceiver.
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Oct 2, 2009
I have an app widget that extends an AppWidgetProvider to create an application widget.
I would like the application widget to be idle until an activity in my app runs; actually when a service in my app is started.
Once that service is started, I need to "wake up" the application widget and communicate with it (i.e. tell it things to display).
So I see that AppWidgetProvider simply extends BroadcastReceiver -- so does that mean:
1. I need to call registerReceiver in my service and tell it to filter for certain kinds of events?
2. Can I even do #1, or will an AppWidgetProvider *only* accept ACTION_APPWIDGET_* intents?
3. If #2 is correct, how can I communicate or "wake up" / trigger the application widget?
4. Can I send events to my app widget using sendBroadcast( intent )?
Then, my app widget has some buttons on it, I need to send an intent back to the application (or service). I see you can do that with PendingIntents, but if i send the different intents it to the same Activity, it seems to re-use the first created pending intent.
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Aug 6, 2009
I want to start a project which contains a BroadcastReceiver and an Activity. The BroadcastReceiver doesn't communicate with the activity. But they share a same resource. Can i do it in only one Project (that means, i use only 1 apk to install both BroadcastReceiver and the Activity on my phone), or i have to develope them seperately in 2 projects.
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Aug 28, 2009
Can I Receive a Broadcast from a Service? It seem I have to extend BroadcastReceiver to receive broadcasts but I'm already extending Service and I can't extend 2 classes. Do I set up an additional Activity to receive broadcasts and then just pass stuff to the already running Service. And if so, how to I pass additional info to an existing Service? Is there a better way?
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Jun 22, 2010
How can I best implement a BroadcastReceiver that may need to "consume" the current broadcast (via abortBroadcast()), but it first needs to perform some non-trivial work to determine whether or not the broadcast should be consumed.
The problem is that if the non-trivial work takes more than 10 seconds then the receiver is considered to be blocked by the system and may be killed.
I realise that long-running operations should not be performed in the onReceive() method of receivers for that very reason, and should instead be handed-off to an appropriate service. However, if the current broadcast is to be consumed, then the abortBroadcast() method must be called within the onReceive() method before it returns. If some processing is required to determine whether the current broadcast should be consumed or not, then things can get tricky.
I'm developing an app that can consume some (but not all) inbound SMS messages. For any given SMS message it will need to perform some analysis based on the sender's phone number and the message body (including database lookups) in order to determine if the message is one that is relevant to the app or not. In the vast majority of cases this will take less than 10 seconds, but it is possible that it could take longer on rare occasions.
To get around this I'm considering the following solution.
1. On receiving a broadcast for a received SMS, my receiver starts a background thread to perform the required analysis and handle the message if appropriate. 2. The main thread (currenly executing the onReceive() method) waits until either the background thread has finished its work, or 8 seconds have elapsed, whichever occurs first. 3. If the background thread finished within the allotted time (which should happen most of the time), then the main thread calls abortBroadcast() or not, (depending on the result of the analysis) and returns normally. 4. If the background thread did NOT finish within 8 seconds, then the main thread stops the background thread and instead starts a service to perform the work. In this case it does NOT call abortBroadcast(), and the broadcast will be passed to other receivers (eg the default messaging app) regardless of whether or not the service ends up handling the message. While not an ideal outcome, it is acceptable.
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Dec 29, 2009
I'd like my app to catch incoming SMS messages. There are a few examples of this around. Looks like we just need to do this:
code:..........
Is this correct? I'm sending my phone some sms messages, but the log statement never gets printed. I do have some other SMS applications installed on the phone, which display a popup when the sms is received - are they somehow blocking the intent from getting passed down to my app, they are just consuming it completely?
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Jun 2, 2010
I have seen several examples on how to implement a BroadCastReceiver, but how should I implement a Service who has to react on some pending Intent (for example incoming phone call)...Actually I was wondering about the same "prbolem" but in an Activity..You obviously have a class which extends a Service 9or an Activity) so it cannot also extend BroadCastReceiver...It looks like we cannot make "platform-awar" services and/or Activties ?
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Jun 22, 2010
I have a BroadcastReceiver set up in my Android application that receives SMS receive events. This works fine, but I want to be able to toggle SMS receiving on and off by toggling the BroadcastReceiver on and off. Because if I have a simple boolean inside the onReceive method, even if the SMS receiving is off, my application will start.
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Aug 8, 2010
I'm trying to create an application that can use the android as a fax machine, IE Send a picture as a fax or receive a fax and save as a picture. So far I'm starting from the ground up and making sure I can intercept a call at the users discretion. I have an Receiver registered in the Manifest of my program with a filter of Phone_State which flags when the state has changed(IE incoming call).
So on my BroadcastReceiver I'm trying to have an AlertDialog popup prompting the user to either accept as fax or call but the AlertDialog seems to throw a android.view.WindowManager$BadTokenException Error when it has an incoming call. My code is just simple an onReceive(context arg0, intent arg1) and I pass the arg0 to the AlertDialog...
The full error message is below
CODE:.............
From what I have seen in the AlertDialog code, it passes the context as well as a Window and WindowManager, which I believe is why it's crashing, is there a better way or something else I should be using which might overlay the call screen?
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Jan 12, 2010
I got back to the widget development after upgrading to the latest SDK and all of the sudden my widget is failing on startup with this message:
ERROR/AndroidRuntime(5296): java.lang.RuntimeException:
Unable to start receiver topjob.widget.SearchWidget:
java.lang.SecurityException: Permission Denial:
attempt to change component state from pid=5296, uid=10057, package uid=10048
Here's two lines of code where exception occurs:..................
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