我的应用程序支持辅助功能，并且应用程序同时具有纵向和横向模式。
在我的屏幕上，我有一些视图，如按钮、文本视图、带有自定义行的列表视图。
我面临的问题是当用户在纵向模式下聚焦任何项目并旋转屏幕时，应用程序不会在横向模式下聚焦相同的元素。有人可以建议如何将焦点设置为在纵向模式下选择的项目到横向模式？
我什至对本机设置应用程序-wifi 页面和“ES 文件浏览”等现有应用程序进行了一些研究，在这些应用程序中，当用户将方向更改为横向模式时，也无法保持可访问性。系统正在从横向选择一些随机元素到纵向，反之亦然。
下面是代码片段
可访问性_sample.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/name_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:contentDescription="Name"
android:focusableInTouchMode="true"
android:text="Name" />
<TextView
android:id="@+id/email_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:contentDescription="Email"
android:focusableInTouchMode="true"
android:text="Email" />
<Button
android:id="@+id/sample_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:contentDescription="Button description"
android:text="ButtonText" />
<CheckBox
android:id="@+id/checkbox"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:contentDescription="Checkbox description"
android:text="Checkbox Text" />
<ListView
android:id="@+id/sample_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fadeScrollbars="false" >
</ListView>
</LinearLayout>
sample_list_row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
>
<CheckBox
android:id="@+id/list_row_cb"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</CheckBox>
<TextView
android:id="@+id/list_row_name"
android:layout_width="match_parent"
android:focusableInTouchMode="true"
android:focusable="true"
android:layout_height="wrap_content" />
</LinearLayout>
可访问性SampleActivity.java
公共类 AccessibilitySampleActivity 扩展 Activity {
private String TAG = AccessibilitySampleActivity.class.getSimpleName();
ListView sampleList;
Button myButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.accessibility_sample);
sampleList = (ListView) findViewById(R.id.sample_list);
myButton = (Button) findViewById(R.id.sample_button);
ArrayList<String> countriesList = new ArrayList<String>();
countriesList.add("India");
countriesList.add("America");
countriesList.add("China");
countriesList.add("Swis");
countriesList.add("Paries");
countriesList.add("Pak");
countriesList.add("Aus");
countriesList.add("Afg");
countriesList.add("Nedharnalds");
countriesList.add("Bangladhesh");
countriesList.add("Srilanka");
countriesList.add("France");
countriesList.add("Japan");
countriesList.add("SouthAfrica");
countriesList.add("Iran");
countriesList.add("Malaysia");
countriesList.add("Nepal");
sampleList.setAdapter(new CustomArrayAdapter(this, R.layout.sample_list_row, countriesList));
}
class CustomArrayAdapter extends ArrayAdapter<String> {
Context context;
int resource;
ArrayList<String> countriesList;
class ViewHolder {
TextView name;
}
public CustomArrayAdapter(Context context, int resource, ArrayList<String> countriesList) {
super(context, resource, countriesList);
this.context = context;
this.resource = resource;
this.countriesList = countriesList;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = vi.inflate(resource, null);
holder = new ViewHolder();
holder.name = (TextView) convertView.findViewById(R.id.list_row_name);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.name.setText(getItem(position));
return convertView;
}
@Override
public int getCount() {
return super.getCount();
}
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public static View findAccessibilityFocus(View view) {
if (view == null)
return view;
if (view.isAccessibilityFocused())
return view;
if (view instanceof ViewGroup) {
ViewGroup viewGroup = (ViewGroup) view;
for (int i = 0; i < viewGroup.getChildCount(); i++) {
View childView = viewGroup.getChildAt(i);
View result = findAccessibilityFocus(childView);
if (result != null)
return result;
}
}
return null;
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
Log.d(TAG, "onConfigurationChanged");
AccessibilityManager am = (AccessibilityManager) getSystemService(ACCESSIBILITY_SERVICE);
boolean isAccessibilityEnabled = am.isEnabled();
boolean isExploreByTouchEnabled = am.isTouchExplorationEnabled();
Log.d(TAG, "isAccessibilityEnabled:" + isAccessibilityEnabled + " isExploreByTouchEnabled:"
+ isExploreByTouchEnabled);
if (isAccessibilityEnabled) {
View activityView = this.findViewById(android.R.id.content);
Log.d(TAG, "activityView:" + activityView);
View selectedView = findAccessibilityFocus(activityView);
if (selectedView != null) {
Log.d(TAG, "selectedView:" + selectedView);
selectedView.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED);
}
}
}
}
对于像 TextView、Button、Checkbox 这样的普通视图，它能够在用户旋转屏幕时保持状态。
如果用户选择下面的列表视图是我面临的问题
- 如果在纵向和旋转屏幕中选择了任何视图，则焦点不会保持在横向。有时如果所选视图能够在不滚动的情况下显示（例如，如果用户选择印度并旋转印度将在不滚动的情况下可见），它会保持状态
- 当用户将屏幕从纵向旋转到横向时，应用滚动并选择任何视图（如日本）并将方向从横向更改为纵向模式，然后我们可以看到它总是选择第一行复选框，即 india 复选框。