在你们让它重复之前,我已经在任何地方搜索过它,而且我被困在了一个需要你的专业知识的地步。SearchView与GridView中的Postexecute方法
我在doInBackground方法中调用我的数据,并将值存储在SimpleAdapter中,并在postExecute方法中,我将适配器分配给我的gridView。而且在PostExecute中,我有一个可以过滤我的适配器的searchView方法。
现在,当我在搜索中按任何字母我的应用程序崩溃与NullPointerException异常,如果相同的代码我运行在同一个线程上而不做一个AsyncTask我没有得到这个错误。这里是我的DoInBackground代码:
protected Void doInBackground(Void... voids) {
try{
connect = CONN(un, passwords, db, ip);
String StoredProc = "{call pro.DocumentDelivery_inst_update_delete(?,?)}";
callableStatement=connect.prepareCall(StoredProc);
callableStatement.setString(1, "Select");
callableStatement.setString(2, MainActivity.usernam);
rs = callableStatement.executeQuery();
while(rs.next()){
Map<String,String> datanum = new HashMap<String, String>();
datanum.put("B",rs.getString("FullName"));
datanum.put("C",rs.getString("Name"));
datanum.put("D",rs.getString("DocumentType"));
datanum.put("A",rs.getString("Id"));
datanum.put("E",rs.getString("TaskType"));
datanum.put("F",rs.getString("Comments"));
datanum.put("G",rs.getString("Tasktime"));
datanum.put("H",rs.getString("Priority"));
datanum.put("I",rs.getString("Telephone"));
data.add(datanum);
}
String [] from = {"A","B","C","D","E","F","G","H","I"};
int[] views = {R.id.doc_grid_t4,R.id.doc_grid_t1, R.id.doc_grid_t2,R.id.doc_grid_t3,R.id.doc_grid_t5,R.id.doc_grid_t6,R.id.doc_grid_t7,R.id.doc_grid_t8,R.id.doc_grid_t9};
ADA = new SimpleAdapter(document_Pro_List.this,data,R.layout.custom_pro_document_view, from, views);
synchronized (this) {
int counter = 0;
while(counter<=4){
this.wait(100);
counter++;
publishProgress(counter*25);
}
}
}
catch (InterruptedException | SQLException e){
e.printStackTrace();
}
return null;
}
,这是我postExecute方法的代码:
protected void onPostExecute(Void result){
sv = (SearchView) findViewById(R.id.searchView);
progressDialog.dismiss();
gridView.setAdapter(ADA);
sv.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String query) {
ADA.getFilter().filter(query);
//ADA.notifyDataSetChanged();
return false;
}
});
}
注:此刻我拿出这个
Map<String,String> datanum = new HashMap<String, String>();
out while循环我停止得到NullPointerException但是这不能帮助我,因为它然后重复第1个d从数据库到所有下一个数据库。 另外我知道我应该和WebAPI一起工作,并且我正在并肩努力。 请帮我解释如何删除此异常。
THANK YOU