求助！！！android studio 的BaseAdapter问题

[千羽QY]

最近刚学安卓开发，遇到一个大问题，凡是用到BaseAdaper的程序，都不能正常运行。不知道是哪里写错了，请教！
下面是ExpandableListView的程序。

public class SecondActivity extends Activity {

    String[] groupName = {"初中同学","高中同学","大学同学","亲戚"};
    String[][] childName = {
            {"李剑凤", "张金茹", "李强", "田德旭", "谢萌萌"},
            {"李文博", "谭有兰", "张玉安", "李敏", "李雪"},
            {"邓清馨", "蔡畅怡", "从定烟", "李蕴奥", "刘敬贺"},
            {"大姑", "小姑", "乐乐", "玉玉", "李月"},
    };
    String[][] childIntroduce = {
            {"今天天气不错哦！","明天去游泳，有约的吗？"," ","啦啦啦~~~","最新化妆品，赶快入手！"},
            {"转眼到山大三年了", "青岛的海真蓝啊！", "下次考试加油!!!!!!!!!!", " ", "考研真他妈累~"},
            {"明天就要去学校了啊","山东剧场有约的吗？","","","有容奶大。。。"},
            {"？？？？", "！！！！", "。。。。", "@@@@@", "什么！？！？！？"},
    };

    private ExpandableListView expandableListView;
    private  ExpandableAdapter expandableAdapter;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        expandableListView = findViewById(R.id.expendable_listview);
        expandableAdapter = new ExpandableAdapter();

        expandableListView.setAdapter(expandableAdapter);
    }

    class ExpandableAdapter extends BaseExpandableListAdapter{

        @Override
        public int getGroupCount() {
            return groupName.length;
        }

        @Override
        public int getChildrenCount(int i) {
            return childName[i].length;
        }

        @Override
        public Object getGroup(int i) {
            return groupName[i];
        }

        @Override
        public Object getChild(int i, int i1) {
            return childName[i][i1];
        }

        @Override
        public long getGroupId(int i) {
            return i*100;
        }

        @Override
        public long getChildId(int i, int i1) {
            return i*100+i1;
        }

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

        @Override
        public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) {

            View view1 = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.group_item,null);
            TextView textView = findViewById(R.id.group_item_name);
            Object text = getGroup(i);
            textView.setText((String) text);

            if(i%2==0){
                textView.setTextColor(Color.BLUE);
            }else if(i%2==1){
                textView.setTextColor(Color.RED);
            }

            return view1;
        }

        @Override
        public View getChildView(int i, int i1, boolean b, View view, ViewGroup viewGroup) {

            View view2 = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.child_item,null);

            TextView textView1 = findViewById(R.id.child_item_name);
            textView1.setText(childName[i][i1]);

            TextView textView2 = findViewById(R.id.child_item_introduce);
            textView2.setText(childIntroduce[i][i1]);

            if(i%2==0){
                textView1.setTextSize(TypedValue.COMPLEX_UNIT_DIP,17);
                textView2.setTextSize(TypedValue.COMPLEX_UNIT_DIP,12);
            }else if(i%2==1){
                textView1.setTextSize(TypedValue.COMPLEX_UNIT_DIP,20);
                textView2.setTextSize(TypedValue.COMPLEX_UNIT_DIP,15);
            }

            return view2;
        }

        @Override
        public boolean isChildSelectable(int i, int i1) {
            return false;
        }
    }
}

[嘿科]

LayoutInflater.from(viewGroup.getContext()) 最好不要这样写，可以写一个构造函数，传入当SecondActivity.this来作为context。

[千羽QY]

改成用Context定义的activity还是不行，错误显示：
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setImageResource(int)' on a null object reference
请问是很么原因？

[Jing丶無雙]

不能正常运行具体是个什么情况？？是报错闪退了么，若果是报错了，再贴一下报错日志

[游逸丶]

你expandableAdapter里的childName和groupName怎么初始化的？
贴的代码不完整，问题没法定位

[YXTS122]

你的Imageview没初始化吧！！！！！！！

[vinda988]

你的Imageview没初始化吧！！！！！！！

[davl]

有错误日志 一目了然