1 page.title=UI Framework Changes in Android 1.5 2 @jd:body 3 4 5 <p>Android 1.5 offers a different default look for 6 the Android UI framework, in relation to Android 1.0 and 1.1. The 7 screenshots below show the same activity (creating a new contact) on 8 Android 1.1 and Android 1.5:</p> 9 10 <img style="margin: 0px auto 10px; display: block; text-align: center; cursor: pointer; width: 400px; height: 277px;" src="images/android.png" alt="" id="BLOGGER_PHOTO_ID_5323141124169754690" border="0"> 11 12 <p>You 13 can see in this example that the buttons and checkboxes have a new 14 appearance. Even though these changes do not affect binary nor source 15 compatibility, they might still break the UI of your apps. As part of 16 the UI refresh, the minimum size of some of the widgets has changed. 17 For instance, Android 1.1 buttons have a minimum size of 44x48 pixels 18 whereas Android 1.5 buttons now have a minimum size of 24x48 pixels. 19 The image below compares the sizes of Android 1.1 buttons with Android 20 1.5 buttons:</p> 21 22 <img style="margin: 0px auto 10px; display: block; text-align: center; cursor: pointer; width: 100px; height: 130px;" src="images/buttons.png" alt="" border="0"> 23 24 <p>If you rely on the button's minimum size, then the layout of your application 25 may not be the same in Android 1.5 as it was in Android 1.1 because of this 26 change. This would happen for instance if you created a grid of buttons using 27 <code>LinearLayout</code> and relying on the minimum size yielded by 28 <code>wrap_content</code> to align the buttons properly:</p> 29 30 <img style="margin: 0px auto 10px; display: block; text-align: center; cursor: pointer; width: 400px; height: 277px;" src="images/grid.png" alt="" id="BLOGGER_PHOTO_ID_5323147943613255250" border="0"> 31 32 <p>This layout could easily be fixed by using the 33 <code>android:layout_weight</code> attribute or by replacing the 34 <code>LinearLayout</code> containers with a <code>TableLayout</code>.</p> 35 36 <p>This example is probably the worst-case UI issue you may encounter when 37 running your application on Android 1.5. Other changes introduced in Android 38 1.5, especially bug fixes in the layout views, may also impact your 39 applicationespecially if it is relying on faulty/buggy behavior of the UI 40 framework.</p> 41 42 <p>If you encounter issues when running your application on Android 1.5, please 43 join us on the <a href="{@docRoot}resources/community-groups.html">Android 44 developer groups</a> or <a 45 href="{@docRoot}resources/community-more.html">IRC</a> so that we and the 46 Android community can help you fix your application.</p> 47 48 <p>Happy coding!</p> 49
