首先在res/xml文件夹下建立preferences.xml
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<? xml version = "1.0" encoding = "utf-8" ?> |
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< PreferenceScreen xmlns:android = "http://schemas./apk/res/android" > |
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< PreferenceCategory android:title = "inline_preferences" > |
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android:key = "checkbox_preference" |
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android:summary = "summary_toggle_preference" |
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android:title = "title_toggle_preference" /> |
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< PreferenceCategory android:title = "dialog_based_preferences" > |
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android:dialogTitle = "dialog_title_edittext_preference" |
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android:key = "edittext_preference" |
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android:summary = "summary_edittext_preference" |
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android:title = "title_edittext_preference" /> |
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android:dialogTitle = "dialog_title_list_preference" |
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android:entries = "@array/entries_list_preference" |
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android:entryValues = "@array/entryvalues_list_preference" |
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android:key = "list_preference" |
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android:summary = "summary_list_preference" |
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android:title = "title_list_preference" /> |
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< PreferenceCategory android:title = "launch_preferences" > |
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android:key = "screen_preference" |
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android:summary = "summary_screen_preference" |
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android:title = "title_screen_preference" > |
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android:key = "next_screen_checkbox_preference" |
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android:summary = "summary_next_screen_toggle_preference" |
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android:title = "title_next_screen_toggle_preference" /> |
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android:summary = "summary_intent_preference" |
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android:title = "title_intent_preference" > |
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android:action = "android.intent.action.VIEW" |
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android:data = "http://www." /> |
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< PreferenceCategory android:title = "preference_attributes" > |
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android:key = "parent_checkbox_preference" |
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android:summary = "summary_parent_preference" |
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android:title = "title_parent_preference" /> |
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android:dependency = "parent_checkbox_preference" |
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android:key = "child_checkbox_preference" |
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android:layout = "?android:attr/preferenceLayoutChild" |
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android:summary = "summary_child_preference" |
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android:title = "title_child_preference" /> |
然后在代码中加载preferences.xml
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public class MyPreferenceActivity extends PreferenceActivity { |
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/** Called when the activity is first created. */ |
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public void onCreate(Bundle savedInstanceState) { |
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super .onCreate(savedInstanceState); |
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addPreferencesFromResource(R.xml.preferences); |
这样就创建了从xml加载preferences的默认的PreferenceActivity。
在加载了preferences.xml的PreferenceActivity中, a top-level preference是一个PreferenceScreen,可用getPreferenceScreen()获取。PreferenceScreen和PreferenceCategory继承自PreferenceGroup,它们可以包含一个或多个PreferenceScreen,PreferenceCategory或者是具体的preference(如EditTextPreference、CheckBoxPreference)。由于PreferenceScreen,PreferenceCategory,EditTextPreference等都是继承自Preference,因此可以通过setLayoutResource()方法设置自己的布局样式。下面将遍历所有Preference,并设置自己的样式,代码如下:
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private void setLayoutResource(Preference preference) { |
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if (preference instanceof PreferenceScreen) { |
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PreferenceScreen ps = (PreferenceScreen) preference; |
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ps.setLayoutResource(R.layout.preference_screen); |
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int cnt = ps.getPreferenceCount(); |
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for ( int i = 0 ; i < cnt; ++i) { |
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Preference p = ps.getPreference(i); |
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} else if (preference instanceof PreferenceCategory) { |
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PreferenceCategory pc = (PreferenceCategory) preference; |
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pc.setLayoutResource(R.layout.preference_category); |
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int cnt = pc.getPreferenceCount(); |
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for ( int i = 0 ; i < cnt; ++i) { |
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Preference p = pc.getPreference(i); |
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preference.setLayoutResource(R.layout.preference); |
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PreferenceScreen preferenceScreen = getPreferenceScreen(); |
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setLayoutResource(preferenceScreen); |
preference_screen.xml
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<? xml version = "1.0" encoding = "utf-8" ?> |
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< LinearLayout xmlns:android = "http://schemas./apk/res/android" |
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android:layout_width = "match_parent" |
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android:layout_height = "wrap_content" |
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android:gravity = "center_vertical" |
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android:minHeight = "?android:attr/listPreferredItemHeight" |
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android:paddingRight = "?android:attr/scrollbarSize" > |
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android:id = "@+android:id/icon" |
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android:layout_width = "wrap_content" |
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android:layout_height = "wrap_content" |
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android:layout_gravity = "center" |
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android:src = "@drawable/ic_launcher" /> |
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android:layout_width = "wrap_content" |
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android:layout_height = "wrap_content" |
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android:layout_marginBottom = "6dip" |
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android:layout_marginLeft = "15dip" |
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android:layout_marginRight = "6dip" |
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android:layout_marginTop = "6dip" |
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android:layout_weight = "1" > |
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android:id = "@+android:id/title" |
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android:layout_width = "wrap_content" |
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android:layout_height = "wrap_content" |
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android:ellipsize = "marquee" |
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android:fadingEdge = "horizontal" |
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android:singleLine = "true" |
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android:textAppearance = "@android:style/TextAppearance.Large" |
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android:textColor = "#FFFF1234" |
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android:id = "@+android:id/summary" |
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android:layout_width = "wrap_content" |
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android:layout_height = "wrap_content" |
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android:layout_alignLeft = "@android:id/title" |
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android:layout_below = "@android:id/title" |
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android:textAppearance = "@android:style/TextAppearance.Small" |
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android:textColor = "#FF888888" /> |
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android:id = "@+android:id/widget_frame" |
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android:layout_width = "wrap_content" |
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android:layout_height = "match_parent" |
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android:gravity = "center_vertical" |
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android:orientation = "vertical" /> |
preference_category.xml
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<? xml version = "1.0" encoding = "utf-8" ?> |
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< LinearLayout xmlns:android = "http://schemas./apk/res/android" |
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android:layout_width = "match_parent" |
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android:layout_height = "wrap_content" |
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android:background = "#FF123456" |
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android:gravity = "center_vertical" |
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android:minHeight = "?android:attr/listPreferredItemHeight" |
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android:paddingRight = "?android:attr/scrollbarSize" > |
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android:id = "@+android:id/icon" |
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android:layout_width = "wrap_content" |
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android:layout_height = "wrap_content" |
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android:layout_gravity = "center" |
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android:src = "@drawable/ic_launcher" /> |
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android:layout_width = "wrap_content" |
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android:layout_height = "wrap_content" |
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android:layout_marginBottom = "6dip" |
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android:layout_marginLeft = "15dip" |
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android:layout_marginRight = "6dip" |
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android:layout_marginTop = "6dip" |
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android:layout_weight = "1" > |
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android:id = "@+android:id/title" |
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android:layout_width = "wrap_content" |
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android:layout_height = "wrap_content" |
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android:ellipsize = "marquee" |
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android:fadingEdge = "horizontal" |
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android:singleLine = "true" |
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android:textAppearance = "@android:style/TextAppearance.Large" |
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android:textColor = "#FFFF0000" /> |
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android:id = "@+android:id/summary" |
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android:layout_width = "wrap_content" |
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android:layout_height = "wrap_content" |
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android:layout_alignLeft = "@android:id/title" |
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android:layout_below = "@android:id/title" |
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android:textAppearance = "@android:style/TextAppearance.Small" |
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android:textColor = "#FF00FF00" /> |
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android:id = "@+android:id/widget_frame" |
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android:layout_width = "wrap_content" |
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android:layout_height = "match_parent" |
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android:gravity = "center_vertical" |
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android:orientation = "vertical" /> |
preference.xml
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<? xml version = "1.0" encoding = "utf-8" ?> |
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< LinearLayout xmlns:android = "http://schemas./apk/res/android" |
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android:layout_width = "match_parent" |
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android:layout_height = "wrap_content" |
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android:gravity = "center_vertical" |
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android:minHeight = "?android:attr/listPreferredItemHeight" |
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android:paddingRight = "?android:attr/scrollbarSize" > |
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android:id = "@+android:id/icon" |
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android:layout_width = "wrap_content" |
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android:layout_height = "wrap_content" |
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android:layout_gravity = "center" /> |
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android:layout_width = "wrap_content" |
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android:layout_height = "wrap_content" |
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android:layout_marginBottom = "6dip" |
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android:layout_marginLeft = "15dip" |
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android:layout_marginRight = "6dip" |
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android:layout_marginTop = "6dip" |
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android:layout_weight = "1" > |
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android:id = "@+android:id/title" |
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android:layout_width = "wrap_content" |
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android:layout_height = "wrap_content" |
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android:ellipsize = "marquee" |
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android:fadingEdge = "horizontal" |
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android:singleLine = "true" |
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android:textAppearance = "@android:style/TextAppearance.Medium" |
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android:textColor = "#FF00FFFF" /> |
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android:id = "@+android:id/summary" |
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android:layout_width = "wrap_content" |
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android:layout_height = "wrap_content" |
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android:layout_alignLeft = "@android:id/title" |
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android:layout_below = "@android:id/title" |
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android:textAppearance = "@android:style/TextAppearance.Small" |
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android:textColor = "#FFFFFF00" /> |
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android:id = "@+android:id/widget_frame" |
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android:layout_width = "wrap_content" |
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android:layout_height = "match_parent" |
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android:gravity = "center_vertical" |
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android:orientation = "vertical" /> |
下面介绍加顶部布局,其实也是添加加一个preference,通过preferenceScreen的addPreference添加。首先自定义一个PreferenceHead,布局中有一个返回按钮。
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package com.preference.main; |
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import android.content.Context; |
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import android.preference.Preference; |
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import android.view.View; |
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import android.view.View.OnClickListener; |
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import android.widget.Button; |
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public class PreferenceHead extends Preference { |
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private OnClickListener onBackButtonClickListener; |
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public PreferenceHead(Context context) { |
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setLayoutResource(R.layout.preference_head); |
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protected void onBindView(View view) { |
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super .onBindView(view); |
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Button btBack = (Button) view.findViewById(R.id.back); |
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btBack.setOnClickListener( new OnClickListener() { |
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public void onClick(View v) { |
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if (onBackButtonClickListener != null ) { |
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onBackButtonClickListener.onClick(v); |
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public void setOnBackButtonClickListener(OnClickListener onClickListener) { |
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this .onBackButtonClickListener = onClickListener; |
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<?xml version= "1.0" encoding= "utf-8" ?> |
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<LinearLayout xmlns:android= "http://schemas./apk/res/android" |
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android:layout_width= "match_parent" |
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android:layout_height= "60.0dip" |
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android:background= "#8000FF00" |
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android:gravity= "center_vertical" > |
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android:id= "@+id/back" |
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android:layout_width= "wrap_content" |
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android:layout_height= "wrap_content" |
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android:layout_margin= "10.0dip" |
然后在代码中实现
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PreferenceHead ph = new PreferenceHead( this ); |
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ph.setOnBackButtonClickListener( new OnClickListener() { |
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public void onClick(View v) { |
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preferenceScreen.addPreference(ph); |
这样就完成了一个具有返回按钮的顶部布局的 PreferenceActivity,效果图如下
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