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android - 自定义列表项不响应选择器中的 state_checked

转载 作者:塔克拉玛干 更新时间:2023-11-01 21:29:34 26 4
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首先我要说我已经详细阅读了关于 SO 的几乎所有问题,我可以找到与自定义可检查列表项和选择器相关的问题。他们中的许多人都有类似的问题,但没有一个答案能解决我的问题。

在我的应用中,我展示了一个自定义列表 Activity 。创建后,它会从调用它的 Intent 中检索一组静态数据,并将该数据传递给它的自定义数组适配器。每个列表项都是一个简单的 RelativeLayout 实现了 Checkable界面。默认情况下,如果您单击其中一项,则会显示一个新 Activity ,其中显示有关所选联系人的详细信息。但是,如果长按列表中的项目,则会启动 ActionMode。此时单击列表中的项目不会显示详细信息 Activity ,它只是将项目设置为已选中。然后,如果用户选择了其中一项操作模式项,它将对选中的项执行操作。

需要了解的重要一点是,在两种选择“模式”中,单击列表项会将其设置为选中状态。

我上面描述的所有内容都完美无缺。我的唯一问题与列表项的背景有关,当它们被设置为选中时,即使使用默认选择器也没有突出显示。

我想做的是有两个选择器:每个选择器一个。在第一种情况下,选中项目时背景不会改变,而在第二种情况下会改变。我试过实现自定义选择器,但即使在那些 state_checked 中也被忽略了!选择器的其他部分工作正常,但不是 state_checked。

我的 CheckableListItem 实现结合了许多不同示例的想法,所以如果我做错了什么,或者如果有更好的方法请告诉我!

注意:有趣的一点是,如果我将 results_list_item.xml 中列表项的背景设置为我的选择器,而不是 ListView 的 listSelector 属性,背景 选中项目时更改。但是,这样做会导致我的选择器中的长按转换不起作用。

ResultsActivity.java:

public class ResultsActivity extends ListActivity implements OnItemLongClickListener {

private ListView listView; // Reference to the list belonging to this activity
private ActionMode mActionMode; // Reference to the action mode that can be started
private boolean selectionMode; // Detail mode or check mode

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_results);

// When the home icon is pressed, go back
ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);

// Get a reference to the list
listView = getListView();

// Initially in detail mode
selectionMode = true;

// Get the contacts from the intent data and pass them to the contact adapter
@SuppressWarnings("unchecked")
ArrayList<Contact> results = ((ArrayList<Contact>)getIntent().getSerializableExtra("results"));
Contact[] contacts = new Contact[results.size()];
ContactArrayAdapter adapter = new ContactArrayAdapter(this, results.toArray(contacts));
setListAdapter(adapter);

// We will decide what happens when an item is long-clicked
listView.setOnItemLongClickListener(this);
}

/**
* If we are in detail mode, when an item in the list is clicked
* create an instance of the detail activity and pass it the
* chosen contact
*/
public void onListItemClick(ListView l, View v, int position, long id) {
if (selectionMode) {
Intent displayContact = new Intent(this, ContactActivity.class);
displayContact.putExtra("contact", (Contact)l.getAdapter().getItem(position));
startActivity(displayContact);
}
}

public boolean onCreateOptionsMenu(Menu menu) {
return super.onCreateOptionsMenu(menu);
}

/**
* If the home button is pressed, go back to the
* search activity
*/
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
Intent intent = new Intent(this, SearchActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
return true;
default:
return super.onOptionsItemSelected(item);
}
}

/**
* When an item is long-pressed, switch selection modes
* and start the action mode
*/
public boolean onItemLongClick(AdapterView<?> adapter, View view, int position, long i) {
if (mActionMode != null)
return false;

if (selectionMode) {
toggleSelectionMode();
listView.startActionMode(new ListActionMode(this, getListView()));
return true;
}
return false;
}

/**
* Clear the list's checked items and switch selection modes
*/
public void toggleSelectionMode() {
listView.clearChoices();
((ContactArrayAdapter)listView.getAdapter()).notifyDataSetChanged();
if (selectionMode) {
selectionMode = false;
} else {
selectionMode = true;
}
}
}

activity_results.xml:

<ListView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:choiceMode="multipleChoice"
android:listSelector="@drawable/list_selector" />

list_selector.xml:

<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:state_pressed="true" android:drawable="@drawable/blue_transition" />
<item android:state_checked="true" android:drawable="@drawable/blue" />
</selector>

双线阵列适配器:

public abstract class TwoLineArrayAdapter extends ArrayAdapter<Contact> {

private int mListItemLayoutResId;

public TwoLineArrayAdapter(Context context, Contact[] results) {
this(context, R.layout.results_list_item, results);
}

public TwoLineArrayAdapter(Context context, int listItemLayoutResourceId, Contact[] results) {
super(context, listItemLayoutResourceId, results);
mListItemLayoutResId = listItemLayoutResourceId;
}

public View getView(int position, View convertView, ViewGroup parent) {

LayoutInflater inflater = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

View listItemView = convertView;
if (convertView == null) {
listItemView = inflater.inflate(mListItemLayoutResId, parent, false);
}

// Get the text views within the layout
TextView lineOneView = (TextView)listItemView.findViewById(R.id.results_list_item_textview1);
TextView lineTwoView = (TextView)listItemView.findViewById(R.id.results_list_item_textview2);

Contact c = (Contact)getItem(position);

lineOneView.setText(lineOneText(c));
lineTwoView.setText(lineTwoText(c));

return listItemView;
}

public abstract String lineOneText(Contact c);

public abstract String lineTwoText(Contact c);

}

ContactArrayAdapter:

public class ContactArrayAdapter extends TwoLineArrayAdapter {

public ContactArrayAdapter(Context context, Contact[] contacts) {
super(context, contacts);
}

public String lineOneText(Contact c) {
return (c.getLastName() + ", " + c.getFirstName());
}

public String lineTwoText(Contact c) {
return c.getDepartment();
}

}

CheckableListItem.java:

public class CheckableListItem extends RelativeLayout implements Checkable {

private boolean isChecked;
private List<Checkable> checkableViews;

public CheckableListItem(Context context, AttributeSet attrs,
int defStyle) {
super(context, attrs, defStyle);
initialise(attrs);
}

public CheckableListItem(Context context, AttributeSet attrs) {
super(context, attrs);
initialise(attrs);
}

public CheckableListItem(Context context, int checkableId) {
super(context);
initialise(null);
}

private void initialise(AttributeSet attrs) {
this.isChecked = false;
this.checkableViews = new ArrayList<Checkable>(5);
}

public boolean isChecked() {
return isChecked;
}

public void setChecked(boolean check) {
isChecked = check;
for (Checkable c : checkableViews) {
c.setChecked(check);
}
refreshDrawableState();
}

public void toggle() {
isChecked = !isChecked;
for (Checkable c : checkableViews) {
c.toggle();
}
}

private static final int[] CheckedStateSet = {
android.R.attr.state_checked
};

protected int[] onCreateDrawableState(int extraSpace) {
final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
if (isChecked()) {
mergeDrawableStates(drawableState, CheckedStateSet);
}
return drawableState;
}

protected void onFinishInflate() {
super.onFinishInflate();
final int childCount = this.getChildCount();
for (int i = 0; i < childCount; i++) {
findCheckableChildren(this.getChildAt(i));
}
}

private void findCheckableChildren(View v) {
if (v instanceof Checkable) {
this.checkableViews.add((Checkable) v);
}
if (v instanceof ViewGroup) {
final ViewGroup vg = (ViewGroup) v;
final int childCount = vg.getChildCount();
for (int i = 0; i < childCount; i++) {
findCheckableChildren(vg.getChildAt(i));
}
}
}
}

results_list_item.xml:

<com.test.mycompany.Widgets.CheckableListItem
android:id="@+id/results_list_item"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:paddingTop="5dp"
android:paddingBottom="5dp" >

<TextView android:id="@+id/results_list_item_textview1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:textSize="20sp"
android:textColor="#000000"
android:focusable="false" />

<TextView android:id="@+id/results_list_item_textview2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@id/results_list_item_textview1"
android:textSize="16sp"
android:textColor="@android:color/darker_gray"
android:focusable="false" />

</com.test.mycompany.Widgets.CheckableListItem>

最佳答案

我在 CheckedListItem 中更改并添加了这些方法,它对我有用:

@Override
public boolean onTouchEvent( MotionEvent event ) {

int action = event.getAction() & MotionEvent.ACTION_MASK;
if ( action == MotionEvent.ACTION_UP ) {
toggle();
}

return true;
}

public void toggle() {

setChecked( !isChecked() );
}

private static final int[] CheckedStateSet = { android.R.attr.state_checked };

问题似乎在于,在单击时,您从未处理过切换 View 的选中状态。

关于android - 自定义列表项不响应选择器中的 state_checked,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13627000/

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