android – 从PreferenceFragment访问列表视图
作者:互联网
我需要在GoogleTV中使用D-PAD处理PreferenceFragment导航.为此,我需要访问PreferenceFragment的ListView(第一个和最后一个元素).
在下面的代码中,我能够访问列表视图的子项,但它是空的.然而,如果我调试我可以看到12个孩子被创建,但他们是null因此计数返回为’0′
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState){
//Log.d(DEBUG_TAG, "onCreateView");
View v = inflater.inflate(R.layout.settings_tile, null);
closeBtn = (ImageView) v.findViewById(R.id.settingsCloseButton);
ListView lv = (ListView) v.findViewById(android.R.id.list);
lv.getChildCount();
return v;
}
下面是PreferenceScreen的xml …注意它是Pref屏幕中的Pref屏幕:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android"
android:key="main_pref">
<PreferenceCategory
android:title="@string/units">
<ListPreference
android:key="pref_unit_temp"
android:title="@string/temperature"
android:defaultValue="@string/default_metric"
android:entries="@array/pref_temp_units"
android:entryValues="@array/pref_temp_units_values"
android:dialogTitle="@string/units"
android:layout="@layout/settings_item"
/>
</PreferenceCategory>
<PreferenceCategory
android:title="@string/advanced">
<ListPreference
android:key="pref_speed"
android:title="@string/speed"
android:entries="@array/pref_speed"
android:entryValues="@array/pref_speed_values"
android:defaultValue="@string/default_metric"
android:layout="@layout/settings_item"/>
<ListPreference
android:key="pref_measurement"
android:title="@string/measurement"
android:entries="@array/pref_measurement"
android:entryValues="@array/pref_measurement_values"
android:defaultValue="@string/default_metric"
android:layout="@layout/settings_item"/>
<ListPreference
android:key="pref_time"
android:title="@string/time_format"
android:entries="@array/pref_time"
android:entryValues="@array/pref_time_values"
android:defaultValue="@string/default_metric"
android:layout="@layout/settings_item"/>
<ListPreference
android:key="pref_date"
android:title="@string/date_format"
android:entries="@array/pref_date"
android:entryValues="@array/pref_date_values"
android:defaultValue="@string/default_metric"
android:layout="@layout/settings_item"/>
</PreferenceCategory>
<PreferenceScreen
android:title="@string/terms_conditions"
android:summary=""
android:layout="@layout/settings_item">
<intent android:action="android.intent.action.VIEW"
android:data="http://www.accuweather.com/m/EULA.aspx" />
</PreferenceScreen>
</PreferenceCategory>
</PreferenceScreen>
我是否可以访问至少第一个和最后一个元素,即“温度”和“条款和条件”,如下图所示:
解决方法:
以下是访问listview和使用dpad控制的解决方案:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState){
//Log.d(DEBUG_TAG, "onCreateView");
View v = inflater.inflate(R.layout.settings_tile, null);
closeBtn = (ImageView) v.findViewById(R.id.settingsCloseButton);
final ListView lv = (ListView) v.findViewById(android.R.id.list);
lv.setOnKeyListener(new OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if (event.getAction() == KeyEvent.ACTION_DOWN) {
switch(keyCode) {
case KeyEvent.KEYCODE_DPAD_DOWN:
return !(lv.getSelectedItemPosition() < lv.getCount() - 1);
case KeyEvent.KEYCODE_DPAD_UP:
return lv.getSelectedItemPosition() == 1;
case KeyEvent.KEYCODE_DPAD_RIGHT:
return true;
}
return false;
}
return false;
}
});
return v;
}
标签:android,android-fragments,android-preferences 来源: https://codeday.me/bug/20190826/1732185.html