android - 带有图像选择和取消选择的 Horizo​​ntalListview

Question

我select/unselect在 listiview 的图像中遇到问题。就我而言，

ByDefault->image color(Yellow)
First click->image color(Orange)
Second click->image color(Yellow)

如果用户点击过那么完美，但是当用户第一次点击第一张图片和第二次点击第二张图片时，两个图片颜色都是橙色（这是问题）。

在我的情况下，一次只有一种图像颜色是橙色（表示已选择）。

Answer 1

1. If you only support HoneyComb and above, it'll easy. Create a StateListDrawable and set it to list view item's background.

selector.xml

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_activated="true" android:drawable="@drawable/item_focus" />
    <item android:drawable="@android:color/transparent" />
</selector>

listview item's layout

<ImageView
    android:id="@+id/image"
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:padding="5dp" />

and the last, set your listview choice mode to SINGLE

list.setChoiceMode(ListView.CHOICE_MODE_SINGLE);

2. If you manage to support pre HoneyComb, you will have to write your own layout implement checkable. You do this in order to work-out using checked state. Let take an example with LinearLayout(you can do the same with others).

 package com.example.listviewactivestate;

 import android.content.Context;
 import android.util.AttributeSet;
 import android.view.View;
 import android.widget.Checkable;
 import android.widget.LinearLayout;

 public class CustomLinearLayout extends LinearLayout implements Checkable {


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

private boolean checked = false;

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

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

@Override
public boolean isChecked() {
    return checked;
}

@Override
public void setChecked(boolean checked) {
    this.checked = checked;

    refreshDrawableState();

    // Propagate to childs
    final int count = getChildCount();
    for (int i = 0; i < count; i++) {
        final View child = getChildAt(i);
        if (child instanceof Checkable) {
            ((Checkable) child).setChecked(checked);
        }
    }
}

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

@Override
public void toggle() {
    this.checked = !this.checked;
}
 }

Use this custom view in xml

 <?xml version="1.0" encoding="utf-8"?>
 <com.example.listviewactivestate.CustomLinearLayout 

 xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="@drawable/selector"
>

<ImageView
    android:id="@+id/image"
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:padding="5dp" />

</com.example.listviewactivestate.CustomLinearLayout >

Change state_activated to state_checked

<selector xmlns:android="http://schemas.android.com/apk/res/android">
   <item android:state_checked="true" android:drawable="@drawable/item_focus" />
   <item android:drawable="@android:color/transparent" />
</selector>

Also set listview choice mode to SINGLE. If it does not work, add onItemClickEvent like this

list.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                // TODO Auto-generated method stub
                list.setItemChecked(position, true);//make sure click item is set to checked.

            }
        });