WHAT I NEED
I'm developing a custom Android launcher for a company, which will be installed on this company's tablets and therefore won't be published on any store.
It's basically a grid with widgets managed remotely (by a background service we're creating), which means that the app should decide which widgets to add or remove whenever the user opens it.
WHAT I HAVE
I'm using the following code to add the widgets:
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(getContext());
AppWidgetHost appWidgetHost = new AppWidgetHost(getContext(), APPWIDGET_HOST_ID);
appWidgetHost.startListening();
List<AppWidgetProviderInfo> appWidgetInfos appWidgetInfos = appWidgetManager.getInstalledProviders();
for(int j = 0; j < appWidgetInfos.size(); j++)
{
if (appWidgetInfos.get(j).provider.getPackageName().equals(widgetPackage))
{
// Allocates an id
int appWidgetId = appWidgetHost.allocateAppWidgetId();
// Gets the app widget info
AppWidgetProviderInfo appWidgetProviderInfo = appWidgetInfos.get(j);
// Creates Widget
AppWidgetHostView hostView = appWidgetHost.createView(getContext(), appWidgetId, appWidgetProviderInfo);
hostView.setAppWidget(appWidgetId, appWidgetProviderInfo);
// Insers the view to the layout grid
insertView(row, column, rowspan, columnspan, hostView);
//
break;
}
}
And it works just fine. The widget shows and it's buttons respond to user touch.
Here's one of the the widgets onUpdate:
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds)
{
// Perform this loop procedure for each App Widget that belongs to this provider
for (int appWidgetId : appWidgetIds)
{
// Create an Intent to launch ExampleActivity
Intent launchAppIntent = new Intent(context, MapActivity.class);
PendingIntent launchApp = PendingIntent.getActivity(context, 0, launchAppIntent, 0);
// Get the layout for the App Widget and attach an on-click listener
// to the button
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget_layout);
views.setOnClickPendingIntent(R.id.widget_layout, launchApp);
// Tell the AppWidgetManager to perform an update on the current app widget
appWidgetManager.updateAppWidget(appWidgetId, views);
}
}
THE PROBLEM
One of the widgets (shown above) calls an Intent to start it's fullscreen Activity when clicked, and this doesn't work on my custom launcher, though it works perfectly on the default home launcher.
Related
I am developing an Android app with a homescreen widget, which is an imageButton, and i want the image of the button to change after its been pressed. I have tried selector in an xml file, to change the image of the button, but it changes it only when it is pressed, but it goes back when its released.
I want it to change image after it was pressed and when the code inside the WidgetProvider is executed, it changes the image back to the default one.
I tried to do it programatically(in onRecieve() method), I guess it should be something with RemoteViews but whatever i try, it doesnt work.
Could someone help my with this? I saw many people asking about it, but most of the posts were either pretty old or the solutions were not working for me.
Thank you :)
Normally you'd set the image on the surface of the ImageButton using the setImageResource method (ImageButton inherits it from ImageView), but that method isn't available for RemoteViews.
RemoteViews offers a corresponding setImageViewResource method that does what you want (as well as setImageViewBitmap and setImageViewUri depending on how you'd like to provide the image data).
The code to set the image (say, within your BroadcastReceiver's onReceive method) would look something like this:
#Override
public void onReceive(Context context, Intent intent) {
int appWidgetId = intent.getIntExtra("appWidgetId", -1);
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.main);
views.setImageViewResource(R.id.imageButton1, R.drawable.awesome_image);
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
appWidgetManager.updateAppWidget(appWidgetId, views);
}
Note that the code above assumes you've added the id of the widget to be manipulated as an extra to the broadcast intent (wrapped in a PendingIntent that is sent when the user clicks the ImageButton) using the key "appWidgetId". You'll most likely want to do that in the onUpdate method of your AppWidgetProvider, like so:
#Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
for (int i = 0; i < appWidgetIds.length; i++) {
int appWidgetId = appWidgetIds[i];
Intent intent = new Intent ("YourActionHere");
intent.putExtra("appWidgetId", appWidgetId);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, i, intent, 0);
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.main);
views.setImageViewResource(R.id.imageButton1, R.drawable.initial_image);
views.setOnClickPendingIntent(R.id.imageButton1, pendingIntent);
appWidgetManager.updateAppWidget(appWidgetId, views);
}
}
A simple but not elegant way is:
boolean isButtonSelected = false;
..
button.setOnClickListener(buttonListener);
..
OnClickListener buttonListener = new OnClickListener() {
#Override
public void onClick(View arg0) {
if(isButtonSelected ){
isButtonSelected = false;
button.setBackgroundResource(R.drawable.buttonOff); // or setImageResource(..);
} else{
isButtonSelected = true;
button.setBackgroundResource(R.drawable.buttonOn);
}
}
};
I am trying to make a widget for my app, and I want it to be with a buttonm progress bar and text view, which would later be changed, so I need to somehow work with the views themselves, like I can from an activity, show a view, hide a view, change a button background etc...
I tried tweaking with the sample code from the Android documentations, but I can only start an activity with this
public class WidgetProvider extends AppWidgetProvider {
#Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
super.onUpdate(context, appWidgetManager, appWidgetIds);
final int N = appWidgetIds.length;
for (int i = 0; i < N; i++) {
int appWidgetId = appWidgetIds[i];
Intent intent = new Intent(context, ActivityMain.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget_layout);
views.setOnClickPendingIntent(R.id.sync_button, pendingIntent);
appWidgetManager.updateAppWidget(appWidgetId, views);
}
}
#Override
public void onReceive(Context context, Intent intent) {
super.onReceive(context, intent);
}
}
Does the widget need to be connected to an activity in order to make actions (connect to the internet, write in the database, write in the objects of the apps instance (if there is one))? And can I work with views the way I am asking?
Outside of setting on-click PendingIntents on views, there isn't much you can do inside of a widget. The standard recipe is:
Make a PendingIntent that sends a broadcast (PendingIntent.getBroadcast()) and set it on the appropriate view in your widget.
In the BroadcastReceiver that receives the intent, you update the widget to show a spinner and start a Service to do whatever long-running work you want to do (e.g connect to the internet).
Once that work is done, you can update your widget again and remove the spinner.
I created a class that downloads some text from the internet and I want to take that text and update a TextView in my widget. I know that the event (OnDownloadCompleteListener) is getting triggered because I'm Logging it but I can't figure out how to update the TextView from within that event. I know it's a newbie mistake, just not sure what I'm missing.
public class Widget extends AppWidgetProvider{
InternetText internettext; //Handles downloading the text from the internet
RemoteViews views;
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
final int N = appWidgetIds.length;
// Perform this loop procedure for each App Widget that belongs to this provider
for (int i=0; i<N; i++) {
int appWidgetId = appWidgetIds[i];
// Create an Intent to launch ExampleActivity
Intent intent = new Intent(context, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
// Get the layout for the App Widget and attach an on-click listener
// to the button
views = new RemoteViews(context.getPackageName(), R.layout.widget);
views.setOnClickPendingIntent(R.id.tvWidgetVerse, pendingIntent);
internettext = new InternetText(context);
internettext.setOnDownloadCompleteListener(new OnDownloadCompleteListener() {
#Override
public void onEvent() {
TheText thetext = internettext.downloadedText(); //The text object
Log.i("", "Widget Text Downloaded " + thetext.getText()); //This fires so I know we've downloaded the text
TextStyling textStyle = new TextStyling();
//*****THIS IS WHERE I'M HAVING THE PROBLEM********
views.setTextViewText(R.id.tvWidgetText, Html.fromHtml(textStyle.boldWords(thetext.getText()))); //this never updates
}
});
internettext.getText();
// Tell the AppWidgetManager to perform an update on the current app widget
appWidgetManager.updateAppWidget(appWidgetId, views);
}
}
}
Ok, I figured it out. I have to call appWidgetManager.updateAppWidget() from within the event. I knew it was a no-brainer...
appWidgetManager.updateAppWidget(appWidgetId, views);
which also means I have to make appWidgetManager and appWidgetId final
public void onUpdate(Context context, final AppWidgetManager appWidgetManager, int[] appWidgetIds) {
...
}
When I click on my application widget, instead of going back to the last activity I left open (when going into the home screen), Android restarts my application from scratch.
Is there a way to make that click behave exactly like my app icon, or like the "recent apps manager"?
Here is how I implemented the widget:
public class WidgetLauncher extends AppWidgetProvider {
#Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
final int N = appWidgetIds.length;
for (int i=0; i<N; i++) {
int appWidgetId = appWidgetIds[i];
Intent active = new Intent(context, COPD_Main.class);
active.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, active, 0);
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.launch_support);
views.setOnClickPendingIntent(R.id.launch_support_launcher, pendingIntent);
appWidgetManager.updateAppWidget(appWidgetId, views);
}
}
}
PS: I am aware there are several questions around like:
this
but it did not fix my problem at all.
I believe the problem is the Intent flag you are using. Try to use:
active.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
isntead of NEW_TASK.
From the docs:
If set, the activity will not be launched if it is already running at
the top of the history stack.
I read some example in internet/book about the App Widget, a normal example to update the widget is in onUpdate(Context context, AppWidgetManager appWidgetManager,int[] appWidgetIds) method of AppWidgetProvider like this:
final int N = appWidgetIds.length;
for (int i=0; i<N; i++) {
int appWidgetId = appWidgetIds[i];
RemoteViews updateViews = new RemoteViews(context.getPackageName(), R.layout.mywidget_layout);
updateViews.setTextViewText(R.id.mytext, "updated text");
appWidgetManager.updateAppWidget(appWidgetId, updateViews);
}
It update each Widgets in a loop.
But now, I have to implement an App Widget, it is updated in BroadcastReceiver, onReceive(Context context, Intent intent) method since there are no int[] appWidgetIds passed in. So I implemented the code like this:
RemoteViews updateViews = new RemoteViews(context.getPackageName(), R.layout.mywidget_layout);
updateViews.setTextViewText(R.id.mytext, "updated text");
ComponentName myComponentName = new ComponentName(context, AndroidBatteryWidgetProvider.class);
AppWidgetManager manager = AppWidgetManager.getInstance(context);
manager.updateAppWidget(myComponentName, updateViews);
It didn't update widget one-by-one, but actually all widgets were updated at once. Even though it worked as I want, but I got confused as to why there is no need to update all widgets one-by-one as before.
What's the difference between two methods?
Can I send another broadcast from BroadcastReceiver.onReceive() to trigger AppWidgetProvider.onUpdate()? And how to?
It's the same thing. Update with ComponentName loops through all the ids like your first code block.
You can see it in the Android code here:
http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/4.0.4_r1.2/com/android/server/AppWidgetService.java#AppWidgetService.updateAppWidgetProvider%28android.content.ComponentName%2Candroid.widget.RemoteViews%29