万能ExpandableListAdapter适配器

转载请声明:http://blog.csdn.net/yoyo_newbie/article/details/50350975

源码下载地址：https://github.com/Sam474850601/CommonExpandableListAdapterDemo

或者引入地址: compile 'com.github.sam474850601:fastutils:1.0.3'

为了避免每次都要写重复代码的BaseExpandableListAdapter,所以写了通用的adapter

假设我要实现这个效果:

用通用的adapter这样的代码轻松搞定

//设置适配器
expandableListView.setAdapter(commonExpandableListAdapter = new CommonExpandableListAdapter, GroupData>(this,R.layout.adapter_child, R.layout.adapter_group ) {
    @Override
    protected void getChildView(ViewHolder holder, int groupPositon, int childPositon, boolean isLastChild, ChildData data) {
        TextView textView = holder.getView(R.id.childtxt);//孩子名字
        textView.setText(data.childName);
    }

    @Override
    protected void getGroupView(ViewHolder holder, int groupPositon, boolean isExpanded, GroupData data) {
        TextView textView = holder.getView(R.id.grouptxt);//分组名字
        ImageView arrowImage = holder.getView(R.id.groupIcon);//分组箭头
        textView.setText(data.groupName);
        //根据分组是否展开设置自定义箭头方向
        arrowImage.setImageResource(isExpanded?R.drawable.ic_arrow_expanded :R.drawable.ic_arrow_uexpanded);

    }
});
expandableListView.setAdapter(commonExpandableListAdapter);

完整代码:

activity_main.xml

设置不要自带的箭头，下面自己添加箭头

xml version="1.0" encoding="utf-8"?>
xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" >

            android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/listView"
        android:groupIndicator="@null"
        />

ic_arrow_expanded.9.png

ic_arrow_uexpanded.9.png

孩子布局

adapter_child.xml

xml version="1.0" encoding="utf-8"?>
xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
            android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/childtxt"
        />

分组布局

xml version="1.0" encoding="utf-8"?>
xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:padding="@dimen/activity_horizontal_margin"
    android:gravity="center_vertical"
    android:layout_height="wrap_content">
            android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/groupIcon"
        android:src="@drawable/ic_arrow_uexpanded"
        />

            android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/grouptxt"
        android:text="分组"
        android:layout_marginLeft="@dimen/activity_horizontal_margin"
        />

MainActivity.java

public class MainActivity extends AppCompatActivity {

    private ExpandableListView expandableListView;
    private CommonExpandableListAdapter, GroupData> commonExpandableListAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        expandableListView = (ExpandableListView) findViewById(R.id.listView);
        //设置适配器
        expandableListView.setAdapter(commonExpandableListAdapter = new CommonExpandableListAdapter, GroupData>(this,R.layout.adapter_child, R.layout.adapter_group ) {
            @Override
            protected void getChildView(ViewHolder holder, int groupPositon, int childPositon, boolean isLastChild, ChildData data) {
                TextView textView = holder.getView(R.id.childtxt);//孩子名字
                textView.setText(data.childName);
                Log.e("test", data.childName);
            }

            @Override
            protected void getGroupView(ViewHolder holder, int groupPositon, boolean isExpanded, GroupData data) {
                TextView textView = holder.getView(R.id.grouptxt);//分组名字
                ImageView arrowImage = holder.getView(R.id.groupIcon);//分组箭头
                textView.setText(data.groupName);
                //根据分组是否展开设置自定义箭头方向
                arrowImage.setImageResource(isExpanded?R.drawable.ic_arrow_expanded :R.drawable.ic_arrow_uexpanded);

            }
        });
        expandableListView.setAdapter(commonExpandableListAdapter);

      //添加测试数据
        addTestData();
    }


    /**
     * 分组数据
     */
    class GroupData
    {
        String groupName;
    }

    /**
     * 孩子数据
     */
    class ChildData
    {
        String childName;
    }



    private void addTestData() {
        for (int i = 0; i < 5; i++)
        {
            GroupData groupData = new GroupData();
            groupData.groupName = "分组-"+i;
            commonExpandableListAdapter.getGroupData().add(groupData);
        }
        for (int i = 0; i < commonExpandableListAdapter.getGroupCount(); i++) {
            List  temp = new ArrayList<>();
            for (int j = 0; j < 20; j++) {
                ChildData childData = new ChildData();
                childData.childName = "第"+i+"组内容-"+j;
                temp.add(childData);

            }
            commonExpandableListAdapter.getChildrenData().add(temp);
        }

        for (int i = 0; i < commonExpandableListAdapter.getGroupCount(); i++) {
            Log.i("test", commonExpandableListAdapter.getGroupData().get(i).groupName);
            for (int j = 0; j < 20; j++)
            {
               //Log.e("test", commonExpandableListAdapter.getChildrenData().get(i).get(j).childName);
           }
        }

        commonExpandableListAdapter.notifyDataSetChanged();
    }



}

dependencies {
compile 'com.github.sam474850601:fastutils:1.0.3'
}