安卓 ListView : Can't get reliable checking behavior for CHOICE_MODE_SINGLE

Question

这里是我所说的怪异的意思:

1. 通常需要按 2 次才能正确更改项目的背景颜色。
2. 当列表被更改时，Android 似乎没有正确地使 ListView 无效，因为被检查的重新使用的 View 在新项目上有被检查的背景(我已经通过调试器确认不是 选中)。
3. 多个项目看起来像是被选中，事实上，当我再次点击它们时“正确地”取消选中，除了 ListView 仅报告最近选中的项目.
4. 我第一次选中某个项目时，无法通过单击取消选中它。
5. 如果我将选择模式更改为 ListView.CHOICE_MODE_MULTIPLE，事情或多或少会正常工作，当然，我不希望进行多项选择。

我正在使用自定义适配器和自定义布局。哦，还有，现在目标是 4.0.3。这是列表的代码:

ListView categoryList = (ListView) findViewById(R.id.categoryList);
categoryList.setAdapter(categoryAdapter);
categoryList.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
categoryList.setItemsCanFocus(false);
categoryList.setOnItemClickListener(categoryAdapter);

这是点击监听器:

public void onItemClick(AdapterView<?> parent, View view, int position, long id) {              
    ListView listView = (ListView) parent;  
    RemoteListItem remoteListItem = (RemoteListItem) view.getTag();

    if (remoteListItem.isEnabled()) {
        remoteListItem.action(view);
    }
    view.invalidate(); /added out of sheer desperation              
}

这是我正在使用的 RelativeLayout 的扩展版本:

package com.sastraxi.machineshop.ui;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.Checkable;
import android.widget.RelativeLayout;

/**
 * RelativeLayout that implements the Checkable interface.
 * Set this view's tag as a Checkable, and this layout will delegate
 * Checkable's interface methods to the tag object. 
 */
public class CheckableRelativeLayout extends RelativeLayout implements Checkable {

    @Override
    public boolean isClickable() {
        return false;
    }

    public CheckableRelativeLayout(Context context) {
        super(context);
    }

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

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

    /**
     * Delegates to (Checkable) getTag().
     */
    public boolean isChecked() {        
        try {
            Checkable checkableTag = (Checkable) getTag();
            return checkableTag.isChecked();
        } catch (ClassCastException e) {
            Log.w("CheckableRelativeLayout", "Tag is not an instance of Checkable; this object won't do anything useful.");
        } catch (NullPointerException e) {
            Log.w("CheckableRelativeLayout", "Tag is null; this object won't do     anything useful.");
        }       
        return false;
    }

    /**
     * Delegates to (Checkable) getTag().
     */
    public void setChecked(boolean checked) {
        try {
            Checkable checkableTag = (Checkable) getTag();
            checkableTag.setChecked(checked);
            invalidate();
        } catch (ClassCastException e) {
            Log.w("CheckableRelativeLayout", "Tag is not an instance of Checkable; this object won't do anything useful.");
        } catch (NullPointerException e) {
            Log.w("CheckableRelativeLayout", "Tag is null; this object won't do anything useful.");
        }
    }

    /**
     * Delegates to (Checkable) getTag().
     */
    public void toggle() {
        try {
            Checkable checkableTag = (Checkable) getTag();
            checkableTag.toggle();
            invalidate();
        } catch (ClassCastException e) {
            Log.w("CheckableRelativeLayout", "Tag is not an instance of Checkable; this object won't do anything useful.");
        } catch (NullPointerException e) {
            Log.w("CheckableRelativeLayout", "Tag is null; this object won't do anything useful.");
        }
    }

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

    /**
     * Reflect the delegate Checkable's state in this View's state set.
     */
    @Override    
    protected int[] onCreateDrawableState(int extraSpace) {
        final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
        if (isChecked()) {
            mergeDrawableStates(drawableState, CHECKED_STATE_SET);
        }     
        return drawableState;
    }

}

这是它代理的列表项类型:

public abstract class RemoteListItem implements Checkable {

    private final String name;
    private final String extra;
    private boolean enabled = true;
    private boolean selected = false;

    public boolean isChecked() {
        return selected;
    }

    public void toggle() {
        selected = !selected;
    }

    public void setChecked(boolean checked) {
        selected = checked;
    }

    public RemoteListItem(String name, String extra) {
        this.name = name;
        this.extra = extra;     
    }

    public String getExtra() {
        return extra;
    }

    public String getName() {
        return name;
    }

    public abstract void action(View viewInList);

    public boolean isEnabled() {
        return enabled;
    }

    public void setEnabled(Boolean enabled) {
        this.enabled = enabled;
        RemoteListAdapter.super.notifyDataSetChanged();
    }

    public boolean isSelectable() {
        return true;
    }

}

这是为项目展开的布局:

<?xml version="1.0" encoding="utf-8"?>
<com.sastraxi.machineshop.ui.CheckableRelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
    android:layout_height="?android:attr/listPreferredItemHeightSmall"
    android:padding="12dp"  
    android:gravity="center_vertical"
    android:background="@drawable/listitem_background">

    <TextView
        android:id="@+id/key"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:layout_alignParentLeft="true"    
        android:inputType="none"   
    />

    <TextView
        android:id="@+id/value"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:gravity="right"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="@color/faded_text_colour"
        android:layout_alignParentRight="true"
        android:inputType="none"
    />

    <ProgressBar
         android:id="@+id/progress"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         style="@android:style/Widget.ProgressBar.Small"
         android:layout_marginTop="5dip"
         android:layout_marginRight="2dip"
         android:gravity="right"
         android:visibility="gone"
         android:layout_alignParentRight="true"/>

</com.sastraxi.machineshop.ui.CheckableRelativeLayout>

还有，@drawable/listitem_background是一个状态列表，勾选的背景色就是从这里来的。对于为什么事情没有按照我期望的方式进行，我感到非常迷茫。好像我在某处遗漏了一个 view.invalidate()，但我无法理解在哪里。

Answer 1

听起来你的第一次触摸是给它焦点，第二次是点击。将项目设置为不可聚焦，您的第一次触摸应注册为点击。