android ExpandAbleListView控件

ExpandAbleListView控件

1.API对ExpandAbleListView的解释：

这里主要的意思就是说：ExpandAbleListView类似于ListView ,但它可以每行展开出自己的list;

2.重要方法

　　　　　　expandGroup (int groupPos) :在分组列表视图中 展开一组，

　　　　　　setSelectedGroup (int groupPosition) ：设置选择指定的组。

　　　　　　setSelectedChild (int groupPosition, int childPosition, boolean shouldExpandGroup) ：设置选择指定的子项。

　　　　　　getPackedPositionGroup (long packedPosition) ：返回所选择的组

　　　　　　getPackedPositionForChild (int groupPosition, int childPosition) ：返回所选择的子项

　　　　　　getPackedPositionType (long packedPosition) ：返回所选择项的类型（Child,Group）

　　　　　　isGroupExpanded (int groupPosition) :判断此组是否展开

3.下面直接展示一个例子

效果如下:

xml文件中就是一个ExpandAbleListView

MainActivity:

public class MainActivity extends Activity {

    private ExpandableListView expandAbleListView;

    private List<String> groupArray;

    private List<List<String>> childArray;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        groupArray = new ArrayList<String>();
        childArray = new ArrayList<List<String>>();
        groupArray.add("水果");
        groupArray.add("动物");
        List<String> tempArray = new ArrayList<String>();
        tempArray.add("葡萄");
        tempArray.add("樱桃");
        tempArray.add("苹果");
        List<String> tempArray1 = new ArrayList<String>();
        tempArray1.add("猴子");
        tempArray1.add("熊猫");
        tempArray1.add("大象");
        childArray.add(tempArray);
        childArray.add(tempArray1);

        expandAbleListView = (ExpandableListView) findViewById(R.id.expandAbleListView);
        expandAbleListView.setAdapter(new myExpandAbleListAdapter(
                MainActivity.this));
        expandAbleListView
                .setOnChildClickListener(new ExpandableListView.OnChildClickListener() {

                    @Override
                    public boolean onChildClick(ExpandableListView parent,
                            View v, int groupPosition, int childPosition,
                            long id) {
                        System.out.println("onChildClick");
                        if (groupPosition == 0) {
                            TextView childView = (TextView) v;
                            childView.setText("第一组group的文字改变");

                        }

                        return false;
                    }
                });

        // 如果要点击展开一个group另外的group格式关闭的 给group添加展开监听，当其中一个group展开的时候其他的group就会关闭
        expandAbleListView
                .setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {

                    @Override
                    public void onGroupExpand(int groupPosition) {
                        for (int i = 0; i < groupArray.size(); i++) {
                            if (i != groupPosition) {

                                expandAbleListView.collapseGroup(i);

                            }

                        }
                    }
                });

    }

    // 自定义ExpandAbleListView
    class myExpandAbleListAdapter extends BaseExpandableListAdapter {
        Context context;

        public myExpandAbleListAdapter(Context context1) {
            this.context = context1;

        }

        @Override
        public int getGroupCount() {
            return groupArray.size();
        }

        @Override
        public int getChildrenCount(int groupPosition) {
            return childArray.get(groupPosition).size();
        }

        @Override
        public Object getGroup(int groupPosition) {
            return groupArray.get(groupPosition);
        }

        @Override
        public Object getChild(int groupPosition, int childPosition) {
            return childArray.get(groupPosition).get(childPosition);
        }

        @Override
        public long getGroupId(int groupPosition) {

            return groupPosition;
        }

        private TextView obtainTextView(String str) {
            AbsListView.LayoutParams params = new AbsListView.LayoutParams(
                    ViewGroup.LayoutParams.FILL_PARENT, 64);
            TextView textView = new TextView(context);
            textView.setLayoutParams(params);
            textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
            // Set the text starting position
            textView.setPadding(36, 0, 0, 0);
            textView.setText(str);
            return textView;

        }

        @Override
        public long getChildId(int groupPosition, int childPosition) {
            return childPosition;
        }

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

        // 获取父list
        @Override
        public View getGroupView(int groupPosition, boolean isExpanded,
                View convertView, ViewGroup parent) {

            TextView textView = obtainTextView(groupArray.get(groupPosition));
            //
            // if (isExpanded) {
            //
            // Toast.makeText(context, "父类是展开了的", Toast.LENGTH_SHORT).show();
            // } else {
            //
            // Toast.makeText(context, "子类是展开了的", Toast.LENGTH_SHORT).show();
            // }

            return textView;
        }

        // 获取子list
        @Override
        public View getChildView(int groupPosition, int childPosition,
                boolean isLastChild, View convertView, ViewGroup parent) {
            TextView textView = obtainTextView(childArray.get(groupPosition)
                    .get(childPosition));
            textView.setGravity(Gravity.CENTER_HORIZONTAL);

            return textView;
        }

        // 如果想让childview能被点击就要返回true
        @Override
        public boolean isChildSelectable(int groupPosition, int childPosition) {
            return true;
        }

    }

}

源码

 

这个简单的例子就到此，下次实现一个综合点的例子如图：