I'm doing an Android project on Eclipse and I have 2 independent apps sources(Modules). How do I combine these two modules, such that when a button (present on first app) is clicked, the second app is launched?
As far I've just created the button and that's it.Any Help would be appreciated.
As I'm a beginner, please be specific :) Thank you!
In the manifest of the second app :
<activity
android:name=".MainActivitySecondApp"
android:label="#string/app_name" >
<intent-filter>
<action android:name="com.external.intentReceiver" />
</intent-filter>
</activity>
And then place the following code inside the onClickListener of the Button in the first App :
Intent intent = new Intent();
intent.setAction("com.external.intentReceiver");
context.startActivity(intent);
So, when the button is clicked, an intent of the type com.external.intentReceiver will be fired. The MainActivitySecondApp will then open since it is meant to handle such intents as defined in the Manifest.
Related
So I programmed an NFC tag to launch my application that I'm currently working on. I used the following service to do that:
https://play.google.com/store/apps/details?id=com.wakdev.wdnfc&hl=en
What I want to do is to switch from one activity to another whenever the NFC tag opens my application.
Under the manifest tag in my AndroidManifest.xml I have:
<uses-permission android:name="android.permission.NFC" />
<uses-sdk android:minSdkVersion="10"/>
<uses-feature android:name="android.hardware.nfc" android:required="true" />
And my MainActivity looks like this:
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.nfc.action.NDEF_DISCOVERED" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="text/plain" />
</intent-filter>
</activity>
Since the NFC tag opens the MainActivity first, I want to see whether it's been opened by NFC. If it has, switch to another activity.
The problem is that getIntent().getAction() always returns android.intent.action.MAIN while I'm expecting android.nfc.action.NDEF_DISCOVERED.
At the moment I'm performing this check (debugging basically) under onResume() method with the following code:
#Override
protected void onResume() {
super.onResume();
System.out.println(getIntent().getAction());
}
And I've tried performing this check under onCreate() and onStart() methods. All of them return android.intent.action.MAIN result while I expect android.nfc.action.NDEF_DISCOVERED.
I'm fresh in Android development and I'm just trying to make this work for a small prototype. Would appreciate if you guys could help me!
Edit: I got it working! I researched this question a lot and I believe that my NFC tag needed some extra data of a text/plain type (I did not specify this mimeType before as well so seems like it's mandatory). I also had put NDEF_DISCOVERED under LAUNCHER category while trying to debug the application and then changed it back to DEFAULT. I'm finally getting my desired results!
getIntent() returns the Intent that was used to create the activity. In your case, that is the home screen launcher Intent.
When you scan the NFC tag, a new Intent will be delivered to that activity. That Intent is passed to an onNewIntent() method that you can override.
Depending on how your activity is being used, you might need to handle both cases:
Where the user launched your app by scanning the NFC tag, so your activity was created with the NDEF Intent
Where the user launched your app by other means before scanning the NFC tag, so your activity was created with some other Intent and you get the NDEF Intent in onNewIntent()
I create a game with LibGDX and I made a main menu for it but I can't do start page this main menu. How Can I do it? Can you help me
enter image description here
You see that
<intent-filter>
<action ...
<action ...
</intent-filter>
part of code? That code controls which one of your activities will be the launching/main activity. Just cut that intent filter and paste it inside of your AndroidLauncher activity tag (which I pressume is your menu).
I have a little mystery here, I have this code in my onCreate method:
Intent intent = getIntent();
if (Intent.ACTION_VIEW.equals(intent.getAction())) {
Log.i(TAG, "ACTION_VIEW START");
Uri uri = intent.getData();
SharedPreferences.Editor tEditor = getSharedPreferences("UserFormPreferences", MODE_PRIVATE).edit();
tEditor.putString("GuestRoomNumber", uri.getQueryParameter("h"));
tEditor.putString("GuestSurname", uri.getQueryParameter("a"));
tEditor.apply();
//it shows an alert to the user
GuestLogin(uri.getQueryParameter("h"), uri.getQueryParameter("a"));
Log.i(TAG, "ACTION_VIEW END");
}
And I have this code in my manifest:
<activity
android:name="epinom.jm.smarthotel.vcMainScreen"
android:label="#string/title_activity_home"
android:launchMode="standard"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="epinom.jm.smarthotel.vcMainScreen" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
<intent-filter>
<data android:scheme="com.guestperience" />
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.BROWSABLE" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
And from a web page I'm executing this JS:
window.location = "com.guestperience://?h=x&a=x";
So here comes the funny part, if I plug my phone, and then in Android Studio, I click on the Play or Debug button, and then I go to the Mail App and tap over a hyperlink that takes me to my web page in Chrome that have the JS instruction, it opens My App and open the intent using the onCreate and onStart method like I expect and add it to the stack of intents in My App, this means that if I'm on any intent of my app and I execute the JS, the app comes to the front and it creates the intent and do what it is supposed to do and shows an alert to the user.
But if I pull the plug or I use the .apk that I have in the Play Store in Beta, this functionality does not work, and I don't understand the difference because to me is the same code, so this is what happens when I'm not connected to Android Studio:
If the app is close, I click on the link, it opens Chrome and the the app is started, and the first intent of the app that is the same that I'm calling, do what it is supposed to do and shows the alert.
Once the app is open if I repeat the steps it never shows the intent and it does not matter if I'm in the initial intent or in another intent.
I have tried to change the code to the onStart but it is almost the same behavior:
If the app is close, I click on the link, it opens Chrome and the the app is started, and the fist intent of the app that is the same that I'm calling, do what it is supposed to do and shows the alert.
Once the app is open if I repeat the steps it only shows the alert when I'm in the main intent (the same that I'm calling), if I'm in another intent it never shows the intent, but if I navigate to the intent the Alert is shown every time I call it. (on every onStart, this can be controlled with a bool).
At the end, I don't understand why the behavior is different when I'm plugged to Android Studio.
Maybe is some permission that I'm missing or something that I have to configure, but I'm lost.
Any help will be appreciated.
Thanks.
UPDATE 1:
I have detected this:
If I plug the phone and press play and keep the plug everything works like a charm.
If I plug the phone and press play and remove the plug everything works like a charm.
If I plug the phone and press play and close the app (the plug can be plugged or not) if I start the app with the link works like a charm, but if the app is started stops working on any intent.
There is something that Android Studio is doing that makes it work, I'm thinking that it has to be with permissions but I'm really lost.
UPDATE 2:
I have tried all the options of this examples and I still have the same result, if the app is open i can't get to the intent, but if the app is closed or is plugged to Android Studio works like a charm.
<!-- Allow web apps to launch Barcode Scanner by linking to http://zxing.appspot.com/scan. -->
<intent-filter>
<action android:name="android.intent.action.VIEW"/>
<category android:name="android.intent.category.DEFAULT"/>
<category android:name="android.intent.category.BROWSABLE"/>
<data android:scheme="http" android:host="guestperience.com" android:path="/Main"/>
</intent-filter>
<!-- Support zxing://scan/?... like iPhone app -->
<intent-filter>
<action android:name="android.intent.action.VIEW"/>
<category android:name="android.intent.category.DEFAULT"/>
<category android:name="android.intent.category.BROWSABLE"/>
<data android:scheme="com.guestperience" android:host="Main" android:path="/"/>
</intent-filter>
I have tried to attach it to the launcher intent and nothing seems to work.
<category android:name="android.intent.category.LAUNCHER"/>
I have tried to launch the app from an href, to see if a user action is needed and still the same result.
CLICK HERE TO LOGIN
https://developer.chrome.com/multidevice/android/intents
https://github.com/zxing/zxing/blob/master/android/AndroidManifest.xml
UPDATE 3:
I have added this to track the action that is called once the app is open:
Log.i(TAG, intent.getAction().toString());
If I open my app for the first time the value is:
"com.guestperience://Main/"
But if I open another intent and open the app through the link again the result is the last action I have called i.e.:
"epinom.jm.smarthotel.vcMainScreen"
And of course if I open the app with Android Studio I always get this value:
"com.guestperience://Main/"
Because all the app is configurable through JSON files all my activities have intent filters so all my calls are like:
Intent tIntent = new Intent("epinom.jm.smarthotel.vcMainScreen"); //replacing this "epinom.jm.smarthotel.vcMainScreen" with the JSON string var of course
startActivity(tIntent);
finish();
I have read this too, and as far as I can tell I'm not missing anything:
http://developer.android.com/intl/es/training/app-indexing/deep-linking.html
After doing a lot of tests and reading a lot, I have ended doing a base class that extends Activity and my Main Activity extends from the Base Activity.
public class BaseActivity extends Activity {
}
public class vcMainScreen extends BaseActivity {
}
Then on the onStart() of the Base Activity I have added this code to handle the call from the browser:
#Override
protected void onStart() {
super.onStart();
Intent intent = getIntent();
if (Intent.ACTION_VIEW.equals(intent.getAction())) {
Uri uri = intent.getData();
SharedPreferences.Editor tEditor = getSharedPreferences("UserFormPreferences", MODE_PRIVATE).edit();
tEditor.putString("GuestRoomNumber", uri.getQueryParameter("h"));
tEditor.putString("GuestSurname", uri.getQueryParameter("a").replace("/",""));
tEditor.apply();
Intent tIntent = new Intent("epinom.jm.smarthotel.vcMainScreen");
tIntent.putExtra("Login", "true");
startActivity(tIntent);
finish();
}
}
As you can see it calls the Main Activity an there in the onStart() I have added this lines to call my login method:
#Override
protected void onStart() {
super.onStart();
if (getIntent().getExtras() != null && getIntent().getExtras().getString("Login") != null && getIntent().getExtras().getString("Login").equals("true")) {
SharedPreferences tPrefs = getSharedPreferences("UserFormPreferences", MODE_PRIVATE);
GuestLogin(tPrefs.getString("GuestRoomNumber", ""), tPrefs.getString("GuestSurname", ""));
getIntent().putExtra("Login", "false");
}
}
And in the Manifest I have added this code:
<activity
android:name="epinom.jm.smarthotel.BaseActivity"
android:label="#string/title_activity_home"
android:launchMode="singleTask"
android:screenOrientation="portrait">
<intent-filter>
<data android:scheme="com.guestperience" android:host="Main" android:path="/"/>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.BROWSABLE" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name="epinom.jm.smarthotel.vcMainScreen"
android:label="#string/title_activity_home"
android:launchMode="standard"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="epinom.jm.smarthotel.vcMainScreen" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
Is important that the Base Activity has a launchMode="singleTask", and a the end I have to use a URL like this:
CLICK HERE TO LOGIN
And I'm using this GIT to handle my DeepLink with some changes:
https://github.com/hampusohlsson/browser-deeplink
I'm sure that this is not the correct way of doing this, but I hope this helps someone in the future.
Happy coding to all.
I have an application with several activities.One of them is Login activity and this activity defined as MAIN in my app in manifest:
<activity
android:name="com.company.myapp.AuthorizationMainActivity"
android:label="#string/app_name"
android:launchMode="singleTask" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
The problem when my app enters background (e.g. I press home button) and then I open the app again - the Login page is showed to me. How can I show activity which was active for user at the moment application enter background?
If you don't explicitly want to use it for a special requirement, remove "android:launchMode="singleTask".
A "singleTask" activity allows other activities to be part of its task. It's always at the root of its task, but other activities (necessarily "standard" and "singleTop" activities) can be launched into that task. (found here at Android Developes)
Use a dummy activity as your base activity that launches and in that activity check to see if you need to display the login activity or another one. Then start that specific activity you want to go to from the dummy activity.
make sure you set the dummy activity to noHistory in the manifest so the user cannot navigate back to it
if(needsLogIn){
Intent i = new Intent(this,LoginActivity.class);
startActivity(i);
}else{
Intent i = new Intent(this,OtherActivity.class);
startActivity(i);
}
Remove android:launchMode="singleTask" > singletask activity will be the root and when you press home button all the activities above it will be removed. when you remove android:launchMode="singleTask" then the default behaviour will take place ie when you press home button and then launch again it will open the activity from where you left. have a look at the link http://developer.android.com/guide/components/tasks-and-back-stack.html
If I would use the following code:
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(takePictureIntent,1);
it would start the default Android camera app right... I've written a custom camera app, but how do let Android know that it's a camera app, and that the user should be given the choice which Camera app to use.
In other words, if I used the code above, my app should start, and not the default android one.
but how do let Android know that it's a camera app, and that the user should be given the chose which Camera app to use.
Have an <intent-filter> on an <activity> for that action:
<intent-filter>
<action android:name="android.media.action.IMAGE_CAPTURE" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
The next time that somebody executes your above startActivityForResult() call, you will appear in the chooser alongside anything else that supports that Intent structure.