我有一个 Activity ，它显示可分配给我的应用程序中的 Activity 事件的复选框(焦点区域)列表。但是，我希望能够阻止用户表单编辑这些值，直到单击按钮将表单置于编辑模式。
有人可以解释或提供代码示例，我如何将其实现到我的应用程序中吗？
此列表保存在 ListView 中，其中包含我为应用程序创建的 FocusArea 类型的自定义 ArrayAdapter。 Activity 的 xml 如下所示:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" android:background="@drawable/horizontal_gradient_line_reverse">
<TextView
android:id="@+id/textViewCustomerNameNumber"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Customer Name & Number" android:layout_margin="5dp"/>
<ListView
android:id="@+id/listViewFocusAreas"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="@+id/relativeLayoutControls"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textViewCustomerNameNumber"
android:layout_margin="5dp"
android:background="@drawable/myborder" >
</ListView>
<RelativeLayout
android:id="@+id/relativeLayoutControls"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true" >
<ImageView
android:id="@+id/imageViewCancelFocusAreaChanges"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:src="@drawable/ic_mini_undo" />
<ImageView
android:id="@+id/imageViewSaveFocusAreaChanges"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toLeftOf="@+id/imageViewCancelFocusAreaChanges"
android:src="@drawable/ic_mini_save" />
<ImageView
android:id="@+id/imageViewEditFocusArea"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toLeftOf="@+id/imageViewSaveFocusAreaChanges"
android:src="@drawable/ic_mini_edit" />
</RelativeLayout>
<ImageView
android:id="@+id/imageViewEditMode"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/textViewCustomerNameNumber"
android:layout_alignRight="@+id/listViewFocusAreas"
android:src="@drawable/edit16x16"
android:visibility="gone" />
</RelativeLayout>
以下是焦点区域行的 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" >
<CheckBox
android:id="@+id/checkBoxFocusArea"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Focus Area" />
</LinearLayout>
以下是自定义ArrayAdapter的代码:
public class FocusAreaAdapter extends ArrayAdapter<FocusArea> {
private ArrayList<FocusArea> focusAreas;
private Context context;
public FocusAreaAdapter(Context context, int textViewResourceId, ArrayList<FocusArea> focusAreas) {
super(context, textViewResourceId, focusAreas);
this.context = context;
this.focusAreas = focusAreas;
}
@Override
public View getView(final int position, View convertView, final ViewGroup parent) {
View v = convertView;
if(v == null) {
LayoutInflater vi = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.focus_area_menu_item, null);
}
FocusArea focusArea = focusAreas.get(position);
if(focusArea != null) {
CheckBox cbFocusArea = (CheckBox)v.findViewById(R.id.checkBoxFocusArea);
cbFocusArea.setText(focusArea.getFocusAreaCodeDescription());
if(focusArea.isFocusAreaCodeChecked() == 1) {
cbFocusArea.setChecked(true);
} else {
cbFocusArea.setChecked(false);
}
cbFocusArea.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
FocusArea focusArea = focusAreas.get(position);
if(focusArea.isFocusAreaCodeChecked() == 1) {
focusArea.setFocusAreaCodeChecked(0);
} else {
focusArea.setFocusAreaCodeChecked(1);
}
}
});
}
return v;
}
}
最后，我使用以下代码实例化我的自定义数组适配器:
private void assignFocusAreasToAdapter() {
// get reference to available responsibles list view control
lvFocusAreas.clearChoices();
// create an array adapter with the communications data array
activityFocusAreaAdapter = new FocusAreaAdapter(this, R.layout.focus_area_menu_item, activityFocusAreas);
// assign the my customers list control the array adapter
lvFocusAreas.setAdapter(activityFocusAreaAdapter);
activityFocusAreaAdapter.notifyDataSetChanged();
Log.i(TAG, "Available Activity Focus Areas Loaded");
}
最佳答案
好的，我为可能遇到相同问题的任何人找到了该问题的解决方案。
重点领域 Activity 的 XML 与上面发布的相同。
焦点区域行项目的 XML 已相应修改:
<?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"
android:descendantFocusability="blocksDescendants" >
<CheckBox
android:id="@+id/checkBoxFocusArea"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Focus Area" />
</LinearLayout>
您可以看到现在添加了以下行 android:descendantFocusability="blocksDescendants" 这可以防止 onClickListener 复选框触发，而这通常会阻止 ListViews OnItemClickedListener 触发。
修改自定义适配器代码以删除 OnClickListener 复选框，如下所示:
public class FocusAreaAdapter extends ArrayAdapter<FocusArea> {
private ArrayList<FocusArea> focusAreas;
private Context context;
public FocusAreaAdapter(Context context, int textViewResourceId, ArrayList<FocusArea> focusAreas) {
super(context, textViewResourceId, focusAreas);
this.context = context;
this.focusAreas = focusAreas;
}
@Override
public View getView(final int position, View convertView, final ViewGroup parent) {
View v = convertView;
if(v == null) {
LayoutInflater vi = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.focus_area_menu_item, null);
}
FocusArea focusArea = focusAreas.get(position);
if(focusArea != null) {
CheckBox cbFocusArea = (CheckBox)v.findViewById(R.id.checkBoxFocusArea);
cbFocusArea.setText(focusArea.getFocusAreaCodeDescription());
if(focusArea.isFocusAreaCodeChecked() == 1) {
cbFocusArea.setChecked(true);
} else {
cbFocusArea.setChecked(false);
}
cbFocusArea.setClickable(false);
}
return v;
}
}
自定义适配器使用与上面发布的相同的代码进行实例化，但您必须将 OnItemClickListener 添加到 ListView 并在 OnItemClickListener 单击事件中执行复选框检查，如下所示:
lvFocusAreas = (ListView)findViewById(R.id.listViewFocusAreas);
lvFocusAreas.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> adapter, View view, int position, long id) {
if(editMode){
FocusArea focusArea = (FocusArea)lvFocusAreas.getItemAtPosition(position);
if(focusArea.isFocusAreaCodeChecked() == 0) {
focusArea.setFocusAreaCodeChecked(1);
} else {
focusArea.setFocusAreaCodeChecked(0);
}
activityFocusAreaAdapter.notifyDataSetChanged();
setControlsEnabled();
}
}
});
希望这对遇到同样问题的人有所帮助。 :D
关于Android 在自定义数组适配器中未处于编辑模式时锁定复选框，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10817089/