1 page.title=UI Framework Changes in Android 1.5 2 parent.title=Articles 3 parent.link=../browser.html?tag=article 4 @jd:body 5 6 7 <p>Android 1.5 offers a different default look for 8 the Android UI framework, in relation to Android 1.0 and 1.1. The 9 screenshots below show the same activity (creating a new contact) on 10 Android 1.1 and Android 1.5:</p> 11 12 <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"> 13 14 <p>You 15 can see in this example that the buttons and checkboxes have a new 16 appearance. Even though these changes do not affect binary nor source 17 compatibility, they might still break the UI of your apps. As part of 18 the UI refresh, the minimum size of some of the widgets has changed. 19 For instance, Android 1.1 buttons have a minimum size of 44x48 pixels 20 whereas Android 1.5 buttons now have a minimum size of 24x48 pixels. 21 The image below compares the sizes of Android 1.1 buttons with Android 22 1.5 buttons:</p> 23 24 <img style="margin: 0px auto 10px; display: block; text-align: center; cursor: pointer; width: 100px; height: 130px;" src="images/buttons.png" alt="" border="0"> 25 26 <p>If you rely on the button's minimum size, then the layout of your application 27 may not be the same in Android 1.5 as it was in Android 1.1 because of this 28 change. This would happen for instance if you created a grid of buttons using 29 <code>LinearLayout</code> and relying on the minimum size yielded by 30 <code>wrap_content</code> to align the buttons properly:</p> 31 32 <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"> 33 34 <p>This layout could easily be fixed by using the 35 <code>android:layout_weight</code> attribute or by replacing the 36 <code>LinearLayout</code> containers with a <code>TableLayout</code>.</p> 37 38 <p>This example is probably the worst-case UI issue you may encounter when 39 running your application on Android 1.5. Other changes introduced in Android 40 1.5, especially bug fixes in the layout views, may also impact your 41 applicationespecially if it is relying on faulty/buggy behavior of the UI 42 framework.</p> 43 44 <p>If you encounter issues when running your application on Android 1.5, please 45 join us on the <a href="{@docRoot}resources/community-groups.html">Android 46 developer groups</a> or <a 47 href="{@docRoot}resources/community-more.html">IRC</a> so that we and the 48 Android community can help you fix your application.</p> 49 50 <p>Happy coding!</p> 51
