Challenges against an android application developer

Starting android development is easy thing. Normally developer are fully aware about java language. It makes easy to learn and develop android application. Because of its open source nature so many tutorial are available on internet. after so many thing android development is pain for developer in comparison  of iPhone development in some cases

1) Device resolution and densities : In android thousand of android device available with different kind of densities and resolution. 

	ldpi	mdpi	hdpi	xhdpi
small	2.3%		2.4%
normal	0.7%	26.2%	57.8%	0.9%
large	0.3%	2%
xlarge		7.4%

see this picture. A developer can imagine the pain to make one application that runs perfectly in all. That's impossible.But if you see iPhone, its has only two densities iPhone or iPod And iPad

2)Its hard to earn with android : on Google play, there are so many of crap application are present.In iPhone, quality of application are much more better than android. Because of manner of uploading in android, its easy to upload application. I have seen android hello world application on Google market. that make hard to get notice

Below content I have taken this from  For Details information

 Payments are not seamless on Android. Google Wallet, a new mobile payments system, was supposed to help solve this problem.   However, as Farago told us, "Google Wallet has limited penetration, there is commerce friction." Compare this to other platforms. With iOS, you can link your phone to your iTunes account and download an app with one click.  Farago also cited Kindle Fire as another example. When a consumer fires up their brand-new Kindle Fire, they have to put a credit card down for the Kindle store, or else they can't use the device.
   "They don't have a curated store." This is Farago's personal hypothesis. As a result of the platform's nature, Android has a less efficient app distribution model than iOS. Farago thinks consumers have been burned more on Android, or, as he put it, "There's a lot of garbage on the shelf."
    "The consumer on Android is less willing to pay, there is more of an expectation that they get free stuff." Farago tells us this is a lot of developers' hypothesis. However, he believes it is often a self-fulfilling prophecy; developers choose to release a free, ad-supported Android app. He pointed to Rovio's Angry Birds Space, one of the most popular games of all time, as an example. Rovio only released a premium version on iOS. However, they created a free version, in addition to a premium one, for Android