android如何做動態登錄界面？

UI實現代碼如下:

1，背景設置圖片:

background_login.xml

& lt？xml？version="1.0 "？編碼="utf-8 "？& gt

& lt外形？xmlns:Android = "/apk/RES/Android " & gt；

& lt漸變？

android:startColor="#FFACDAE5 "

Android:end color = " # ff 72 CAE 1 "

android:angle="45 "

/& gt；

& lt/shape & gt；

2、圓形白盒

效果圖頂部不是白盒。其實盒子是白色的，但是設置了透明值，也是用壹個xml文件實現的。

background_login_div.xml

& lt？xml？version="1.0 "？編碼="UTF-8 "？& gt

& lt外形？xmlns:Android = "/apk/RES/Android " & gt；

& lt固體？android:color="#55FFFFFF "？/& gt；

& lt！- ?設置圓角

註意:？BottomRightRadius是左下角而不是右下角-& gt；

& lt角落？Android:topLeftRadius = " 10dp "？Android:topRightRadius = " 10dp "

Android:bottomRightRadius = " 10dp "？Android:bottomLeftRadius = " 10dp "/& gt；

& lt/shape & gt；

3.界面布局:

login.xml

& lt？xml？version="1.0 "？編碼="utf-8 "？& gt

& lt線性布局

xmlns:Android = "/apk/RES/Android "

android:orientation="vertical "

Android:layout _ width = " fill _ parent "

Android:layout _ height = " fill _ parent "

Android:background = " @ drawable/background _ log in " & gt；

& lt！- ?填充？內緣？布局_邊距？邊緣

android:layout_alignParentTop？布局的位置在頂部嗎？-& gt；

& ltRelativeLayout？

android:id="@+id/login_div "

Android:layout _ width = " fill _ parent "

Android:layout _ height = " wrap _ content "

android:padding="15dip "

Android:layout _ margin = " 15 dip "？

Android:background = " @ drawable/background _ log in _ div _ BG "？& gt

& lt！- ?賬號？-& gt；

& ltTextView？

Android:id = " @+id/log in _ user _ input "

Android:layout _ width = " wrap _ content "

Android:layout _ height = " wrap _ content "

Android:layout _ alignParentTop = " true "

android:layout_marginTop="5dp "

Android:text = " @ string/log in _ label _ username "

style = " @ style/normal text "/& gt；

& ltEditText？

android:id="@+id/username_edit "

Android:layout _ width = " fill _ parent "

Android:layout _ height = " wrap _ content "

Android:hint = " @ string/log in _ username _ hint "

Android:layout _ below = " @ id/log in _ user _ input "

android:singleLine="true "

Android:input type = " text "/& gt；

& lt！- ?密碼？文字？-& gt；

& ltTextView？

Android:id = " @+id/log in _ password _ input "

Android:layout _ width = " wrap _ content "

Android:layout _ height = " wrap _ content "

Android:layout _ below = " @ id/username _ edit "

android:layout_marginTop="3dp "

Android:text = " @ string/log in _ label _ password "

style = " @ style/normal text "/& gt；

& ltEditText？

android:id="@+id/password_edit "

Android:layout _ width = " fill _ parent "

Android:layout _ height = " wrap _ content "

Android:layout _ below = " @ id/log in _ password _ input "

android:password="true "

android:singleLine="true "

Android:input type = " text password "？/& gt；

& lt！- ?登錄按鈕？-& gt；

& lt按鈕？

android:id="@+id/signin_button "

Android:layout _ width = " wrap _ content "

Android:layout _ height = " wrap _ content "

Android:layout _ below = " @ id/password _ edit "

Android:layout _ align right = " @ id/password _ edit "

Android:text = " @ string/log in _ label _ sign in "

Android:background = " @ drawable/blue _ button "？/& gt；

& lt/relative layout & gt；

& ltRelativeLayout？

Android:layout _ width = " fill _ parent "

Android:layout _ height = " wrap _ content "？& gt

& lttextview Android:id = " @+id/register _ link "

Android:text = " @ string/log in _ register _ link "

Android:layout _ width = " wrap _ content "

Android:layout _ height = " wrap _ content "

Android:layout _ margin left = " 15dp "

android:textColor="#888 "

Android:textColorLink = " # ff 0066 cc "？/& gt；

& ltImageView？Android:id = " @+id/mini Twitter _ logo "

android:src="@drawable/cat "

Android:layout _ width = " wrap _ content "

Android:layout _ height = " wrap _ content "

Android:layout _ alignParentRight = " true "

Android:layout _ alignParentBottom = " true "

Android:layout _ margin right = " 25dp "

Android:layout _ margin left = " 10dp "

Android:layout _ margin bottom = " 25dp "？/& gt；

& ltImageView？android:src="@drawable/logo "

Android:layout _ width = " wrap _ content "

Android:layout _ height = " wrap _ content "

Android:layout _ toLeftOf = " @ id/mini Twitter _ logo "

Android:layout _ align bottom = " @ id/mini Twitter _ logo "

Android:padding bottom = " 8dp "/& gt；

& lt/relative layout & gt；

& lt/linear layout & gt；

4、java源代碼，Java源文件比較簡單，只需實例化Activity，去掉標題欄即可。

包裹？com . my Twitter . a activity；

進口？Android . app . activity；

進口？Android . OS . bundle；

進口？Android . view . window；

公共？班級？LoginActivity？延伸？活動？{

@覆蓋

公共？作廢？onCreate(捆綁？savedInstanceState)？{

super . oncreate(savedInstanceState)；

requestWindowFeature(窗口。特征_編號_標題)；

setContentView(r . layout . log in)；

}

} ?

5.實現效果如下:？