Tuesday, February 23, 2016

How to find default sms messaging app


From api level 19 onwards, its just a one line call to get the packageName of default sms application.
Telephony.Sms.getDefaultSmsPackage(context)
Before API level 19, there is no concept of Default Sms, so what we can do is get the list of messaging apps.
private Object[] getMessagingAppPackageNames(Context context) {
   List messagingAppPackgeNameList = new ArrayList<>();
   final PackageManager pm = context.getPackageManager();
   //get metaData for installed apps
   List packages = pm.getInstalledApplications(PackageManager.GET_META_DATA);

   for (ApplicationInfo appInfo : packages) {
      String packageName = appInfo.packageName;
      if (packageName != null && (packageName.contains("sms")
             || packageName.contains("mms") || packageName.contains("message")
             || packageName.contains("SMS") || packageName.contains("MMS")
             || packageName.contains("Message") || packageName.contains("media")
             || packageName.contains("Media"))) {
                messagingAppPackgeNameList.add(packageName);
      }
   }
   return messagingAppPackgeNameList.toArray();
}
This list may have all messaging apps plus some other apps also. But at least we can make sure the list will have all messaging app package names.

Saturday, February 20, 2016

Dsiplay Multiple Notifications in status bar

For showing multiple notifications use unique identifier while creating notification which means use unique id in notify() method.

eg: notificationManager.notify(tag, id, notification);

Here, id should be unique.

Also, in PendingIntent "REQUEST_CODE" should be unique. use the same code as notificationId.

PendingIntent pIntent = PendingIntent.getService(context, id, intent, PendingIntent.FLAG_UPDATE_CURRENT);
Here also, id should be unique, use the same id itself. When clicking on notification, if you want to launch some component, to "intent" pass the desired arguments. For cancel, use both tag and id in the activity or service to cancel. First pass the tag and id to the service and then cancel using BOTH. This is very important


Wednesday, February 17, 2016

How to get a Color from hexadecimal Color String

To get the color int from hexadecimal string use the parseColor() methood from android.graphics.Color class

eg: int color = Color.parseColor("#FFFF0000");

Monday, February 15, 2016

DialogFragment - Where to use OnDismissListener and OnCancelListener

If you want to use OnCancelListener or OnDismissListener on dialog fragment, use it in onStart() rather than on onCreateDialog(); 

Saturday, February 13, 2016

Snackbar and FloatingButton Behavior

Snackbar is just an extension of Toast. It is an actionable Toast. Snackbar will stay on the screen forever or for a short duration (Snackbar.LENGTH_INDEFINITE, SnackBar.LENGTH_LONG, Snackbar.LENGTH_SHORT) and we can set action as well. One example that is coming to my mind is, from a list user deleted an item, then we can give user the option to "Undo" using Snackbar.

Now we will come to the implementation part.

Snackbar snackbar = Snackbar.make(recyclerView, "Do you want to undo", Snackbar.LENGTH_LONG).setAction("Undo", snackBarClickListener);
snackbar.setActionTextColor(Color.WHITE);
View snackbarView = snackbar.getView();
snackbarView.setBackgroundColor(Color.DKGRAY);
snackbar.getView().addOnAttachStateChangeListener(new View.OnAttachStateChangeListener() {

     @Override
     public void onViewAttachedToWindow(View v) {
        // write your code here
     }

     @Override
     public void onViewDetachedFromWindow(View v) {
        // write your code here
     }
});
Now about the floating button. Floating button is like when the snackbar appears, floating button floats. We will see the implementation. Here the floating action button is bottom right side. The xml to be defined in the layout is,

<android.support.design.widget.FloatingActionButton
        android:id="@+id/bottom_right_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|right"
        android:src="@drawable/foooooo"
        app:backgroundTint="#some color"
        app:elevation="6dp"
        app:fabSize="normal"
        app:rippleColor="# some color"
        app:layout_behavior="com.smartandroidians.FloatingActionButtonBehavior"
        android:layout_marginBottom="@dimen/fab_margin_bottom"
        android:layout_marginRight="@dimen/fab_margin_right"
        app:layout_anchorGravity="bottom|right|end" />
Now the class of FloatingActionButton is as follows,
public class FloatingActionButtonBehavior extends CoordinatorLayout.Behavior {

    public FloatingActionButtonBehavior(Context context, AttributeSet attrs) {
    }

    @Override
    public boolean layoutDependsOn(CoordinatorLayout parent, FloatingActionButton child, View dependency) {
        return dependency instanceof Snackbar.SnackbarLayout;
    }

    @Override
    public boolean onDependentViewChanged(CoordinatorLayout parent, FloatingActionButton child, View dependency) {
        float translationY = Math.min(0, dependency.getTranslationY() - dependency.getHeight());
        child.setTranslationY(translationY);
        return true;
    }
}
This is in the new android design support library. In gradle file, add this line as
dependencies {
  compile 'com.android.support:design:22.2.1'
}
Then if you are using proguard file, then all these lines, otherwise FloatingActionButtonBehavior class won't accept the proguard.
-keepclasseswithmembers class * {
    native ;
}

-keepclasseswithmembers class * {
    public (android.content.Context, android.util.AttributeSet);
}

-keepclasseswithmembers class * {
    public (android.content.Context, android.util.AttributeSet, int);
}
If you want to know more about proguard settings, please check here

One last point is, for FloatingActionButton should be in CoordinatorLayout. the xml is as,
<android.support.design.widget.CoordinatorLayout
    android:id="@+id/rootLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
That's it !!! Enjoy Coding !!!

Androidians