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==========系统方法实现上啦刷新=========

public class GreatToolsActivity extends Activity {    private TextView tv;    private ListView listtest;    private LinearLayout lt;    private TestSmsSafeAdapt adp;    private ArrayList
   
     oneStr;    @Override    public void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_greatetools);        TextView tv = findViewById(R.id.tv_guishudi);        tv.setClickable(true);        //手机号码归属地的textView的点击事件        tv.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Intent intent = new Intent(GreatToolsActivity.this, NuberAdressActivty.class);                startActivity(intent);            }        });        //********************listview分批加载数据测试******************        oneStr = new ArrayList
    
     ();//更新的数据        for (int m=0;m<5;m++){            oneStr.add(m+"");        }        lt = findViewById(R.id.nowLoading);        listtest = findViewById(R.id.listtest);        loadingListview();//加载数据        //给listview注册滚动事件的监听器        listtest.setOnScrollListener(new AbsListView.OnScrollListener() {            //当滚动的状态发生变化的时候            @Override            public void onScrollStateChanged(AbsListView absListView, int i) {                switch (i) {                    case AbsListView.OnScrollListener.SCROLL_STATE_IDLE:                        Log.e("scroll", "空闲状态");                        //判断当前listview的位置                        int lastposition = listtest.getLastVisiblePosition();//获取最后一个可见条目在所有数据集合中的位置                        Log.e("scroll", "空闲状态"+lastposition);                        if (lastposition == oneStr.size() - 1) {                        //列表被移动到最后的位置，加载更过数据                        for (int n = 0; n < 2; n++) {                            if(oneStr.size()+n<100) {                                oneStr.add((oneStr.size() + 1)+"");                            }                        }                        loadingListview();//刷新listview                    }                        break;                    case AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:                        Log.e("scroll", "手指触摸状态");                        break;                    case AbsListView.OnScrollListener.SCROLL_STATE_FLING:                        Log.e("scroll", "惯性滑行状态");                        break;                }            }            // 滚动的时候            @Override            public void onScroll(AbsListView absListView, int i, int i1, int i2) {            }        });    }    //********加载数据    private void loadingListview() {        lt.setVisibility(View.VISIBLE);//设置转圈的布局可见        if (adp == null) {            adp = new TestSmsSafeAdapt();        }        lt.setVisibility(View.INVISIBLE);//设置转圈的布局不可见        listtest.setAdapter(adp);    }    private class TestSmsSafeAdapt extends BaseAdapter {        @Override        public int getCount() {            return oneStr.size();        }        @Override        public Object getItem(int i) {            return null;        }        @Override        public long getItemId(int i) {            return 0;        }        //有多少个条目，这个方法就会被调用多少次        @Override        public View getView(final int i, View view, ViewGroup viewGroup) {            final View v;            if (view != null) {                v = view;            } else {                v = View.inflate(getApplicationContext(), R.layout.listtestitem, null);                tv = (TextView) v.findViewById(R.id.list_testitemtv);            }            tv.setText(oneStr.get(i));            return v;        }    }}
    
   

============更新listView的数据==========

public class CallSmsSafeActivty extends Activity {    private TextView tv_blackname;    private ListView lst_blackname;    private List
   
     infos;    private BlacknameDao dao;    private CallSmsSafeAdapt adp;    private Button adblackBtn;    @Override    public void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.callsmssafe_activity);        tv_blackname = findViewById(R.id.tv_blackname);        lst_blackname = findViewById(R.id.lst_blackname);        dao = new BlacknameDao(this);        infos = dao.findAll();        adp = new CallSmsSafeAdapt();        lst_blackname.setAdapter(adp);        adblackBtn =(Button)findViewById(R.id.addblacknameBtn);        adblackBtn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                addblacknameClick(view);//点击天加按钮            }        });    }    private class CallSmsSafeAdapt extends BaseAdapter {        private viewHolder holder;        @Override        public int getCount() {            return infos.size();        }        @Override        public Object getItem(int i) {            return null;        }        @Override        public long getItemId(int i) {            return 0;        }        //有多少个条目，这个方法就会被调用多少次        @Override        public View getView(final int i, View view, ViewGroup viewGroup) {            final View v;            if (view != null) {                v = view;                holder = (viewHolder) v.getTag();            } else {                v = View.inflate(getApplicationContext(), R.layout.list_callblackname_item, null);                holder = new viewHolder();                holder.tv = (TextView) v.findViewById(R.id.list_blackname_item);                v.setTag(holder);            }            holder.tv.setText(infos.get(i).getNumber());            AlertDialog.Builder bu=new AlertDialog.Builder(CallSmsSafeActivty.this);//注意这里不能用getApplicationContext()，对话框只能用this，this代表当前的activity；            bu.setTitle("警告");            bu.setMessage("确定给取消");            bu.setPositiveButton("确定", new DialogInterface.OnClickListener() {                @Override                public void onClick(DialogInterface dialog, int which) {                    //删除                    holder.image=v.findViewById(R.id.image_blackname_item);                    holder.image.setOnClickListener(new View.OnClickListener() {                        @Override                        public void onClick(View view) {//删除数据                            dao.delete(infos.get(i).getNumber());//通知适配器更新listview                            adp.notifyDataSetChanged();                        }                    });                }            });            bu.setNegativeButton("取消", new DialogInterface.OnClickListener() {                @Override                public void onClick(DialogInterface dialog, int which) {                }            });            bu.show();            return v;        }    }    //记事本存储textview的内存地址    class viewHolder {        private TextView tv;        private ImageView image;    }    private EditText enterbalckname;    private Button cancelBtn;    private Button sureBtn;    //添加黑名单按钮,弹出dialog    public void addblacknameClick(View view) {       Log.e("addblack","d");        AlertDialog.Builder builder = new AlertDialog.Builder(this);        final AlertDialog dialog = builder.create();        View contentview = View.inflate(this, R.layout.dialog_enterblackname, null);        dialog.setView(contentview, 0, 0, 0, 0);        dialog.show();//        enterbalckname = findViewById(R.id.et_enterblackname);        cancelBtn = findViewById(R.id.enterBlacknamecancelclick);        sureBtn = findViewById(R.id.enterBlacknamesureclick);        sureBtn.setOnClickListener(new View.OnClickListener() {            @SuppressLint("WrongConstant")            @Override            public void onClick(View view) {                String blackname = enterbalckname.getText().toString().trim();                if (TextUtils.isEmpty(blackname)) {                    // 电话不能为空                    Toast.makeText(getApplicationContext(), "号码不能为空", 1);                    return;                }//吧数据加到数据库                dao.add(blackname);//更新listView                BlackNumberInfo info=new BlackNumberInfo();                info.setNumber(blackname);                infos.add(info);                //通知listview数据适配器更新                adp.notifyDataSetChanged();                dialog.dismiss();            }        });        cancelBtn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                dialog.dismiss();            }        });    }}
   

listview.setDevice（null）;//分割线设置为null

listview.setverticalscrollbarEnabled(false);//设置垂直方向不能滚动；

item和button点击事件冲突的解决：

android:descendantFocusability="blocksDescendants"

如果ListView的item中包含了button等同样需要点击事件监听的控件时，系统在默认情况下使item中的事件监听的控件获取焦点，使ListView失去焦点，导致无法响应setOnItemClickListener()方法。

        那么添加的这个属性是什么意思呢？

beforeDescendants：viewGroup会优先其子控件而获取到焦点。

afterDescendants：viewGroup只有当子类控件不需要获取焦点时才获取焦点。

blocksDescendants：viewGroup会覆盖子类控件而直接获取焦点。

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