android listView 自定义布局结合CheckedTextView实现多选

apiDemo中有一个listView实现多选的例子

比较简单

[plain]
package com.example.android.apis.view;

import android.app.ListActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

/**
* This example shows how to use choice mode on a list. This list is
* in CHOICE_MODE_MULTIPLE mode, which means the items behave like
* checkboxes.
*/
public class List11 extends ListActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setListAdapter(new ArrayAdapter<String>(this,
                android.R.layout.易做图_list_item_multiple_choice, GENRES));

        final ListView listView = getListView();

        listView.setItemsCanFocus(false);
        listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
    }

    private static final String[] GENRES = new String[] {
        "Action", "Adventure", "Animation", "Children", "Comedy", "Documentary", "Drama",
        "Foreign", "History", "Independent", "Romance", "Sci-Fi", "Television", "Thriller"
    };
}

package com.example.android.apis.view;

import android.app.ListActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

/**
* This example shows how to use choice mode on a list. This list is
* in CHOICE_MODE_MULTIPLE mode, which means the items behave like
* checkboxes.
*/
public class List11 extends ListActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setListAdapter(new ArrayAdapter<String>(this,
                android.R.layout.易做图_list_item_multiple_choice, GENRES));

        final ListView listView = getListView();

        listView.setItemsCanFocus(false);
        listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
    }

    private static final String[] GENRES = new String[] {
        "Action", "Adventure", "Animation", "Children", "Comedy", "Documentary", "Drama",
        "Foreign", "History", "Independent", "Romance", "Sci-Fi", "Television", "Thriller"
    };
}

利用了framework中的布局易做图_list_item_multiple_choice.xml ，该布局内容就是一个CheckedTextView

[html]
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/text1"
    android:layout_width="match_parent"
    android:layout_height="?android:attr/listPreferredItemHeight"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:gravity="center_vertical"
    android:checkMark="?android:attr/listChoiceIndicatorMultiple"
    android:paddingLeft="6dip"
    android:paddingRight="6dip"
/>

在实际的应用中我们肯定会遇到复杂布局的情况，一旦使用复杂布局，发现listview原生的多选模式失效了！失效原因通过查看ListView的源码可以发现，问题出在setupChild函数中

[java]
private void setupChild(View child, int position, int y, boolean flowDown,int childrenLeft, boolean selected, boolean recycled) {
        ..................
        if (mChoiceMode != CHOICE_MODE_NONE && mCheckStates != null) {
            if (child instanceof Checkable) {
                ((Checkable) child).setChecked(mCheckStates.get(position));
            }
        }
    }

private void setupChild(View child, int position, int y, boolean flowDown,int childrenLeft, boolean selected, boolean recycled) {
  ..................
  if (mChoiceMode != CHOICE_MODE_NONE && mCheckStates != null) {
   if (child instanceof Checkable) {
    ((Checkable) child).setChecked(mCheckStates.get(position));
   }
  }
}

其中的child对象就是自定义adapter的getView()函数的返回结果，由于我们没有实现Checkable接口所以无法操作。变通办法，ListView有一个察看item是否被选中的函数，结合该函数，修改自定义adapter的getView函数：

[java]
public View getView(int position, View convertView, ViewGroup parent) {
        boolean check = ((ListView)parent).isItemChecked(position);
        viewHolder.myCheckedTextView.setChecked(check);
    ｝

public View getView(int position, View convertView, ViewGroup parent) {
boolean check = ((ListView)parent).isItemChecked(position);
viewHolder.myCheckedTextView.setChecked(check);
｝（o(︶︿︶)o 唉csdn编辑器真心难用啊怎么改都不能把结尾的那些杂乱代码删掉）

[java]

[plain]
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补充：移动开发 , Android ,