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Android » mobilerobots.pl - all about mobile robots, sumo robots

Android

Android activity lifecycle:
android activity lifecycle

Java packages fully implemented in Android:
  • java.io
  • java.math
  • java.nio
  • java.security
  • java.sql
  • java.text
  • java.util.concurrent
  • java.util.logging
  • java.util.regex
  • java.crypto
  • javax.net
  • javax.sql
  • javax.xml
  • org.w3c.dom
  • org.xml.sax

Java packages partially implemented in Android:

  • java.awt
  • java.beans
  • java.lang
  • java.net
  • java.util
  • javax.security

Java packages not implemented in Android:

  • java.applet
  • java.rmi
  • javax.accessibility
  • javax.activation
  • javax.activity
  • javax.annotation
  • javax.imageio
  • javax.jws
  • javax.lang.model
  • javax.mangement
  • javax.naming
  • javax.print
  • javax.rmi
  • javax.script
  • javax.sound
  • javax.swing
  • javax.tools
  • javax.transaction
  • org.ietf.jgss
  • org.omg

Different devices have different pixel density e.g.:

Model Android Density
HTC Wildfire 2.1-2.3 mdpi
HTC Desire 2.2-2.3 hdpi
HTC One X 4.0 xhdpi
Nexus 10 4.2 xhdpi

Android generalized screen sizes and densities (with respect to actual values - inches, dpi)

Sizes:
  • small (at least 426x320 dp)
  • normal (at least 470x320 dp)
  • large (at least 640x480 dp)
  • xlarge (at least 960x720 dp)

android_generalized_sizes

Densities:

  • ldpi (low)
  • mdpi (medium)
  • hdpi (high)
  • xhdpi (extra high)

android_generalized_densities

The size of the launcher icon in \res\drawable... folders should be as follows (taking into account the scalin ratio :3:4:6:8):

density pixels icon
ldpi 36x36 android_ldpi
mdpi 48x48 android_mdpi
hdpi 72x72 android_hdpi
xhdpi 96x96 android_xhdpi