Har*_*hid 5 android android-widget horizontalscrollview android-2.2-froyo android-listview
我select/unselect在listiview 中的图像中遇到问题.就我而言,
ByDefault->image color(Yellow)
First click->image color(Orange)
Second click->image color(Yellow)
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如果用户点击途中然后完美,但是当用户第一次点击第一张图片并第二次点击第二张图片时,两种图像颜色都是橙色(这是问题).
在我的情况下,一次只有一种图像颜色为橙色(表示已选中).
选择器.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>
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列表视图项目的布局
<ImageView
android:id="@+id/image"
android:layout_width="100dp"
android:layout_height="100dp"
android:padding="5dp" />
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最后,将列表视图选择模式设置为SINGLE
list.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
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2. 如果你设法支持pre HoneyComb,你将不得不编写自己的布局工具checkable。您这样做是为了使用选中状态进行锻炼。让我们以 LinearLayout 为例(你可以对其他布局做同样的事情)。
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;
}
}
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在 xml 中使用此自定义视图
<?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 >
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改成state_activatedstate_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>
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还将列表视图选择模式设置为SINGLE。如果不行的话就onItemClickEvent这样添加
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.
}
});
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