I have two issues with a Sencha Touch application, first is how do I remove the top bar highlighted in red, second is, when I press the back from above bar it goes back fine but when I press the phone's back button it takes me out of application, what can I do? Look at the picture below
I have already tried using navigationBar:hidden or false and autoMaximize:true, also about back button thing I don't have any idea so please suggest me something.
Question 1)
I guess you are using Sencha native packaging, and you have encountered this bug: http://www.sencha.com/forum/showthread.php?259817-3.1.0.256-Strange-Android-Titlebar-on-native-Apps/page2
Quote from richardvd user of Sencha Touch Forums:
This is the Android TitleBar, you can remove it by adding an attribute to your base AndroidManifest.xml.
In my case this file is located here: C:\ext\Sencha\Cmd\3.1.1.274\stbuild\st-res\android\AndroidManifest.xml
Open it and add this attribute to the application field: android:theme="@android:style/Theme.NoTitleBar"
Question 2)
You can control the back button behaviour from Javascript with Cordova/Phonegap:
document.addEventListener("backbutton", yourCallbackFunction, false);
Source: PhoneGap documentation