add some utils code
#	modified:   android-demos/AndroidManifest.xml
#	modified:   android-demos/res/values/strings.xml
#	new file:   android-demos/src/com/example/android_demos/DemoApplication.java
#	new file:   android-demos/src/com/example/receiver/NetworkReceiver.java
#	new file:   android-demos/src/com/example/receiver/OnNetworkListener.java
#	new file:   android-demos/src/com/example/receiver/OnStorageListener.java
#	new file:   android-demos/src/com/example/receiver/StorageReceiver.java
#	new file:   android-demos/src/com/example/utils/CommonUtil.java
#	new file:   android-demos/src/com/example/utils/Constants.java
#	new file:   android-demos/src/com/example/utils/CrashHandler.java
#	new file:   android-demos/src/com/example/utils/NetUtils.java

#