Why some part of my app lost in my friend phone while everything looks ok in my phone?

Please kindly help me…I made application and everything is ok and perfects in my phone but in my friend’s phone it looks ugly and disappear some parts of my app…What is the problem and its solution???

send your app

Set all components height width value in % value

I have set all components size in %…then say how can i set font size in %…