Develop Reference

Pass a part of link in android app after click over it

In my app manifest i wrote this code to open some links with my app adding the intent-filter:
<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="https" android:host="example.com" />
</intent-filter>
I tried to send via email to myself a link; for example: http://www.example.com/1234. click over the link i open the app.. That's great. Now, is it possible take the 1234 part of the link and put it into a textview? Something like:
mTextView.setText(textFromLink);
thanks

Did you already get access to the URL inside your app? If not, you can get it e.g. in your onCreate method with
Uri link = getIntent().getData();
which returns a Uri object:
http://developer.android.com/reference/android/net/Uri.html
This object has several methods to get the specific parts of the URL. In your case it will probably be
String content = link.getLastPathSegment():
http://developer.android.com/reference/android/net/Uri.html#getLastPathSegment()
This returns a string that you can set in your TextView:
mTextView.setText(content);

how to make our activity page open from another application?

I am new in android development, I want to build a music player but the problem in front of me is how do i make my app open from gallery.
For example,
if we want to open any music file then we select it, the the android mobile ask which player do we want to use.
so how can I add my app in that option.
please help.

If you want your app to be in the list for opening an audio file, you need to tell the system your app can open those files. You can do that by adding something like the following to your activity tag in your AndroidManifest.xml:
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<data android:scheme="content"/>
<data android:scheme="file"/>
<data android:mimeType="audio/*"/>
<data android:mimeType="application/ogg"/>
<data android:mimeType="application/x-ogg"/>
<data android:mimeType="application/itunes"/>
</intent-filter>
Intent filters are part of the core principles in Android development. You should try to get some knowledge on these basic topics before getting started.

It helps you
Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
File file = new File(YOUR_SONG_URI);
intent.setDataAndType(Uri.fromFile(file), "audio/*");
startActivity(intent);

Actually you can open activity not app at self just simply add action intent filter in mainfest like this
<activity class=".foo" android:label="#string/title_notes_list">
<intent-filter>
<action android:name="com.me.love" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
other app code :
Intent intent = new Intent("com.me.love");
startActivity(intent);
however if you want to tell android system that your activity can handle some actions like share or send data you just have to add "send" action to your activity in mainfest like so :
<activity class=".boo" android:label="#string/title_notes_list">
<intent-filter>
<action android:name="android.intent.action.SEND" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="text/plain" />
</intent-filter>
</activity>
so now when ever user click share button android system will check all activitys that have action string "android.intent.action.SEND" then give the user list of activitys that have send action and if you did added same action as boo activity dose to your activity then it will be one of chooses in the list.

Android app opening wrong page after using uri scheme

In IOS I have 2 apps (App A and App B) that will be performing different objective but at 1 point, App A will call App B using uri scheme to perform a function where App A does not have.
I wanted to implement this function to Android and currently have developed a demo for initiating call to App B. Now I am working on App B that will be receiving the uri scheme from the demo app.
Problem:
After App B return to the demo app using uri scheme I close the demo app.
When I go back to home page and open the multitask to reopen App B(or open App B through the icon), the page it reopen is the function that is used for demo app but what I wanted is the login page of App B.
This is a part of the Manifest for the intent-filter
<activity
android:name="com.apps.MasterActivity"
android:label="#string/app_name"
android:screenOrientation="portrait"
android:clearTaskOnLaunch="true"
android:windowSoftInputMode="adjustPan" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<data
android:host="x-callback-url"
android:scheme="myapp" />
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
</intent-filter>
</activity>
This is where I call back to the demo app
Intent sendIntent = new Intent(Intent.ACTION_VIEW, responseUri);
sendIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
finish();
startActivity(sendIntent);

Try adding this to your activity tag in AndroidManifest.xml
android:clearTaskOnLaunch="true"

Apparently I kinda found a solution that can force the app to show the login page after going back to the demo app. By putting this code in the activity.java file.
#SuppressWarnings("deprecation")
#Override
public void onDestroy()
{
super.onDestroy();
System.runFinalizersOnExit(true);
System.exit(0);
}
I know its a deprecated function that I'm using but will try to solve it when there's something wrong in the future or when I found a better solution for it.
Edit:
Found a better solution that does not need to use the deprecated function which I have forgotten to set it to false.
I have a flag that is set to true when the app is connected through Uri Scheme which i just have to set it to false and it will be fixed. This is the change location that I made
Intent sendIntent = new Intent(Intent.ACTION_VIEW, responseUri);
sendIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
finish();
startActivity(sendIntent);
Util.isUriScheme = false;

Multiple Application Files in one Android app

I made three apps, which I now want to ship in one apk file (one installation). On startup of the "wrapper app" the user should decide which app to run.
So far, so good, but the problem is, each app is using global constants from an Application file. Is there a way to build the three apps into one, where each app uses its own application file?
Thanks!
To avoid confusion i add a short example:
App 1:
public class AApplication extends Application {
public static String CONSTANT_1 = "aaa";
}
App 2:
public class BApplication extends Application {
public static String CONSTANT_1 = "bbb";
}
App 3:
public class CApplication extends Application {
public static String CONSTANT_1 = "ccc";
}

Ok, since the idea I head is obviously not realizable I came up with the following workaround:
I created an Apllication class in the new Project
public class NewApplication extends OldSuperApplication {}
I added a method
public static void setApplication(RGCApplication a) {
CONSTANT_1 = a.CONSTANT_1;
...
}
after selecting the desired "sub-app" on the startscreen in this case application "A" i call
NewApplication.setApplication(new AApplication());
or
NewApplication.setApplication(new BApplication());
I'm not sure if this is smelly coding or not, but it works!

Probably you want three activity that can be launched. Add in the manifest something like this:
<activity
android:name=".Activityone"
android:label="First Activity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Activitysecond"
android:label="Second Activity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Activitythree"
android:label="Third Activity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
In this way user has three icons (activity) to click.

You can not integrate 3 different apk and its respective code-base to run by single apk, either integrate all 3 code-base in single application and divide all 3 as different modules to run depending upon selection by user.

Confusion over execution order

I have a game application made up of several different activities. The first to be called is a splash screen, when this completes, this finishes and starts up another activity via an intent. In order to have access to some global data that is consistent across all the activities, I also have a "globals" class like this:
public class Globals extends Application
{
int global_variable_A;
int global_variable_B;
int global_variable_C;
public void onCreate()
{
// stuff
}
}
In the androidmanifest.xml I have the the following (amongst other things):
<application
android:icon="#drawable/mygame_icon"
android:screenOrientation="portrait"
android:label='"My Game"' android:name=".Globals">
<activity
android:label="My Game"
android:name=".Splash"
android:screenOrientation="portrait">
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
My question now is, which will be executed first, the onCreate of Globals or the onCreate of Splash? Or are they run at the same time on different threads? I ask because I'm getting some inconsistent behaviour that would be explained if they were on different threads.

onCreate() Global off course.. Application gets executed first and then the Activity,,.. you can test for yourself by keeping a debug point in Application onCreate() method..