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Android设置背景色可以通过在res/drawable里定义一个xml,如下:
1 | <? xml version = "1.0" encoding = "utf-8" ?> |
2 | < shape xmlns:android = "http://schemas.android.com/apk/res/android" > |
3 | < gradient |
4 | android:startColor = "#FFF" |
5 | android:endColor = "#000" |
6 | android:angle = "45" /> |
7 | </ shape > |
shape是用来定义形状的,gradient定义该形状里面为渐变色填充,startColor起始颜色,endColor结束颜色,angle表示方向角度。当angle=0时,渐变色是从左向右。 然后逆时针方向转,当angle=90时为从下往上。
实现过程:
第一步:
res/drawable/background_login.xml
1 | <? xml version = "1.0" encoding = "utf-8" ?> |
2 | < shape xmlns:android = "http://schemas.android.com/apk/res/android" > |
3 | < gradient |
4 | android:startColor = "#FFF" |
5 | android:endColor = "#000" |
6 | android:angle = "45" /> |
7 | </ shape > |
第二步:
res/layout/login.xml
1 | <? xml version = "1.0" encoding = "utf-8" ?> |
2 | < LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" |
3 | android:orientation = "vertical" |
4 | android:layout_width = "fill_parent" |
5 | android:layout_height = "fill_parent" |
6 | android:background = "@drawable/background_login" > |
7 | </ LinearLayout > |
01 | import android.app.Activity; |
02 | import android.os.Bundle; |
03 | |
04 | public class LoginActivity extends Activity { |
05 | @Override |
06 | public void onCreate(Bundle savedInstanceState) { |
07 | super .onCreate(savedInstanceState); |
08 | setContentView(R.layout.login); |
09 | } |
10 | } |
效果图:
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