Android: Modify the view attribute in preference

The android Development Kit preference provides some of our setting tools, including preferenceactivity, preference, preferencescreen, and checkboxpreference. They can be used to conveniently set attributes of applications.

　　

Sometimes, we do not need the monotonous UI provided by the system. We usually modify some attributes, such as the view background and font attributes. There are two options at this time:

1. Define a cutom layout for a single application. Of course, this layout should be consistent with the system layout element (otherwise, how can you change it ?), Then add a custom layout to the Android: Layout file in preference. XML (you can retrieve the file name by yourself.

2. Modify preference-related attributes for the entire android system. All interfaces that use preferenceactivity will change accordingly. Here, you only need to modify the corresponding system layout file (in framework/base/CORE/RES/layout), such as preference_category.xml.

1. Let's talk about it first. It is quite common.

First, define your layout file. You can copy this layoutn directly to the framework and mark it as custom_preference.xml.

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     android:layout_width="match_parent" android:layout_height="wrap_content"
 3     android:minHeight="?android:attr/listPreferredItemHeight"
 4     android:gravity="center_vertical" android:paddingRight="?android:attr/scrollbarSize">
 5 
 6     <RelativeLayout android:layout_width="wrap_content"
 7         android:layout_height="wrap_content" android:layout_marginLeft="15dip"
 8         android:layout_marginRight="6dip" android:layout_marginTop="6dip"
 9         android:layout_marginBottom="6dip" android:layout_weight="1">
10 
11         <TextView android:id="@+android:id/title"
12             android:layout_width="wrap_content" android:layout_height="wrap_content"
13             android:singleLine="true" android:textAppearance="?android:attr/textAppearanceLarge"
14             android:ellipsize="marquee" android:fadingEdge="horizontal"
15             android:textColor="#475ad7"/>
16 
17         <TextView android:id="@+android:id/summary"
18             android:layout_width="wrap_content" android:layout_height="wrap_content"
19             android:layout_below="@android:id/title" android:layout_alignLeft="@android:id/title"
20             android:textAppearance="?android:attr/textAppearanceSmall"
21             android:textColor="#5ad747"/>
22 
23     </RelativeLayout>
24 
25     <!-- Preference should place its actual preference widget here. -->
26     <LinearLayout android:id="@+android:id/widget_frame"
27         android:layout_width="wrap_content" android:layout_height="match_parent"
28         android:gravity="center_vertical" android:orientation="vertical"/>
29 
30 </LinearLayout>

Then, you can apply the layout file to some preference. XML files.

1 <?xml version="1.0" encoding="utf-8"?>
2 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
3     <CheckBoxPreference    android:key="checkbox_key"
4         android:title="checkbox_title"
5         android:summary="checkbox_summery"
6         android:defaultValue="true"
7         android:layout="@layout/custom_preference_layout"></CheckBoxPreference>
8 </PreferenceScreen>

OK. Now, you can use this preference. xml file as usual. You will find that the font color has changed.

　　

2. In the second case, we need to build the Android system's compiling environment.

Directly go to the system layout file (in framework/base/CORE/RES/layout) and modify preference. XML. Here is just for the example above. You can also modify other preference files. The content of the preference. xml file is the content of the custom_preference.xml file in the first case.

After modification, restart the mka system, restart the simulator, and OK. The first method has the same effect.