xmlns:android作用以及自定义布局属性

xmlns:android作用以及自定义布局属性

要定制Android layout 中的 attributes关键是要明白android中命名空间定义如：

xmlns:android="

以RingtonePreference为例:

<span style="font-size:18px;"><strong><PreferenceScreen xmlns:android=""android:title="@string/sound_settings"android:key="sound_settings"xmlns:settings=".android.settings"><com.android.settings.DefaultRingtonePreferenceandroid:key="ringtone"android:title="@string/ringtone_title"android:summary="@string/ringtone_summary"android:dialogTitle="@string/ringtone_title"android:persistent="false"android:ringtoneType="ringtone" /></strong></span>

<span style="font-size:18px;"><strong>public RingtonePreference(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);TypedArray a = context.obtainStyledAttributes(attrs,com.android.internal.R.styleable.RingtonePreference, defStyle, 0);mRingtoneType = a.getInt(com.android.internal.R.styleable.RingtonePreference_ringtoneType,RingtoneManager.TYPE_RINGTONE);mShowDefault = a.getBoolean(com.android.internal.R.styleable.RingtonePreference_showDefault,true);mShowSilent = a.getBoolean(com.android.internal.R.styleable.RingtonePreference_showSilent,true);a.recycle();
}</strong></span>

<span style="font-size:18px;"><strong>xmlns:android=":settings=".android.settings"</strong></span>

<span style="font-size:18px;"><strong><!-- Base attributes available to RingtonePreference. -->
<declare-styleable name="RingtonePreference"><!-- Which ringtone type(s) to show in the picker. --><attr name="ringtoneType"><!-- Ringtones. --><flag name="ringtone" value="1" /><!-- Notification sounds. --><flag name="notification" value="2" /><!-- Alarm sounds. --><flag name="alarm" value="4" /><!-- All available ringtone sounds. --><flag name="all" value="7" /></attr><!-- Whether to show an item for a default sound. --><attr name="showDefault" format="boolean" /><!-- Whether to show an item for 'Silent'. --><attr name="showSilent" format="boolean" />
</declare-styleable></strong></span>