如何在sqlite数据库OnClick getJson中插入我已解析的Json对象？

Question

//**MainActivity** 
----------------------------------------------------------------- 
public class MainActivity extends AppCompatActivity { 


    String json_string; 
    public ProgressBar progressBar; 
    public TextView textView; 
    Toolbar toolbar; 
    ProgressDialog progressDialog; 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     setContentView(R.layout.activity_main); 

    } 


    public void getJson(View view){ 

     new MainActivity.BackgroundTask(this).execute(); 

    } 

    public class BackgroundTask extends AsyncTask<Void,Void,String> { 

     String json_url; 
     String JSON_STRING; 
     Context context; 


     public BackgroundTask(Context context) { 
      this.context = context; 
     } 

     @Override 
     public void onPreExecute(){ 

      progressDialog=new ProgressDialog(context,ProgressDialog.STYLE_SPINNER); 
      progressDialog.setMessage("Loading.....Please Wait"); 
      progressDialog.show(); 

      json_url="http://demo5629995.mockable.io/Employee1"; 
     } 

     @Override 
     protected String doInBackground(Void... params) { 

      try{ 
       URL url=new URL(json_url); 
       HttpURLConnection httpURLConnection=(HttpURLConnection)url.openConnection(); 
       InputStream inputStream=httpURLConnection.getInputStream(); 
       BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(inputStream)); 
       StringBuilder stringBuilder=new StringBuilder(); 
       while ((JSON_STRING=bufferedReader.readLine())!=null){ 
        stringBuilder.append(JSON_STRING+"\n"); 
       } 
       bufferedReader.close(); 
       inputStream.close(); 
       httpURLConnection.disconnect(); 
       return stringBuilder.toString().trim(); 

      } catch (MalformedURLException e) { 
       e.printStackTrace(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
      return null; 
     } 

     protected void onProgressUpdate(Void values){ 
      super.onProgressUpdate(values); 
     } 

     public void onPostExecute(String result){ 
      progressDialog.dismiss(); 
      TextView textView= (TextView) findViewById(R.id.tvjson); 
      textView.setText(result); 
      json_string=result; 

     } 
    } 

    public void parseJson(View view){ 


     if(json_string==null){ 
      Toast.makeText(this,"get Json",Toast.LENGTH_LONG).show(); 
     } 
     else { 
      Intent intent=new Intent(this,JsonDisplayActivity.class); 
      intent.putExtra("json_data",json_string); 
      startActivity(intent); 
     } 

    } 
} 

// JsonDisplayActivity _______________________________________________________________

public class JsonDisplayActivity extends Activity { 
    String json_string; 
    JSONObject jsonObject; 
    JSONArray jsonArray; 
    EmployeeAdapter employeeAdapter; 
    ListView listView; 
    List<employee> empList = new ArrayList<>(); 

    DatabaseHandler databaseHandler=new DatabaseHandler(this); 

    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_displaylistview); 

     listView= (ListView) findViewById(R.id.listview); 


     json_string=getIntent().getExtras().getString("json_data"); 
     try { 
      jsonObject=new JSONObject(json_string); 
      jsonArray=jsonObject.getJSONArray("emp"); 
      int count=0; 
      String name,email,url; 

      while (count<jsonArray.length()){ 

       JSONObject jo=jsonArray.optJSONObject(count); 
       name=jo.getString("Name"); 
       email=jo.getString("Email"); 
       url=jo.getString("Url"); 

       employee emp=new employee(name,email,url); 
       // employeeAdapter.add(emp); 
       empList.add(emp); 
       count++; 



      } 
     } catch (JSONException e) { 
      e.printStackTrace(); 
     } 

     employeeAdapter=new EmployeeAdapter(this,R.layout.activity_row,empList); 
     listView.setAdapter(employeeAdapter); 
    } 
} 

// EmployeeAdapter _____________________________________________________________________

public class EmployeeAdapter extends ArrayAdapter { 

    List list; 
    public EmployeeAdapter(Context context, int resource,List<employee> employeeList) { 
     super(context, resource); 
     list=employeeList; 
    } 

    public void add(employee object){ 
     super.add(object); 
     list.add(object); 
    } 

    public int getCount(){ 
     return list.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
     return list.get(position); 
    } 


    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     View row; 
     row=convertView; 
     EmployeeHolder employeeholder; 
     if(row==null){ 
      LayoutInflater layoutInflater= (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      row=layoutInflater.inflate(R.layout.activity_row,parent,false); 
      employeeholder=new EmployeeHolder(); 
      employeeholder.tv_name= (TextView) row.findViewById(R.id.tvname); 
      employeeholder.tv_email= (TextView) row.findViewById(R.id.tvemail); 
      employeeholder.tv_url= (TextView) row.findViewById(R.id.tvUrl); 

      row.setTag(employeeholder); 
     } 
     else { 
      employeeholder=(EmployeeHolder)row.getTag(); 
     } 
     // employee emp= (employee) this.getItem(position); 
     employee emp= (employee) list.get(position); 
     employeeholder.tv_name.setText(emp.getName()); 
     employeeholder.tv_email.setText(emp.getEmail()); 
     employeeholder.tv_url.setText(emp.getUrl()); 

     return row; 
    } 

    static class EmployeeHolder{ 
     TextView tv_name,tv_email,tv_url; 
    } 
} 

// 雇员 __________________________________________________________

public class employee { 
    String name; 
    String email; 
    String url; 

    public employee(String name, String email,String url){ 
     this.setName(name); 
     this.setEmail(email); 
     this.setUrl(url); 


    } 

    public String getName() { 
     return name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 

    public String getEmail() { 
     return email; 
    } 

    public void setEmail(String email) { 
     this.email = email; 
    } 

    public String getUrl() { 
     return url; 
    } 

    public void setUrl(String url) { 
     this.url = url; 
    } 
} 

Answer 1

您可以使用

ArrayList<HashMap<String, String>> DETAILS = new ArrayList<HashMap<String, String>>(); 


try { 
      JSONArray data = new JSONArray(/*YOUR JSON DATA*/); 

     DETAILS.clear(); 
     HashMap<String, String> map; 
     int i = 0; 
     //Users.clear(); 
     for(i = 0; i < data.length(); i++){ 
      HashMap<String, String> hashmap = new HashMap<String, String>(); 
      JSONObject c = data.getJSONObject(i); 
      hashmap.put("NAME", c.getString("NAME")); 
      hashmap.put("EMAIL", c.getString("EMAIL")); 
      hashmap.put("URL", c.getString("URL")); 
      DETAILS.add(hashmap); 
     } 
     if (i >= data.length()) 
     { 
     DatabaseHelper DH = new DatabaseHelper(getApplicationContext()); 
      DH.addIntoUsers(DETAILS); 
      DH.close(); 
      Log.d("USERS:", ""+DETAILS); 

     } 

} catch (JSONException e) { 
    // TODO Auto-generated catch block 
    e.printStackTrace(); 
} 

，并在您DatabaseHelper类，你应该声明函数

public void addIntoCases(ArrayList<?> arraylist) 
{ 
    SQLiteDatabase sqlitedatabase = getWritableDatabase(); 
    sqlitedatabase.delete("EMPLOYEE_TBL", null, null); 

    ContentValues contentvalues = new ContentValues(); 
    int i = 0; 

    for(i=0;i<arraylist.size();i++){ 
     contentvalues.put("NAME", (String)((HashMap<?, ?>)arraylist.get(i)).get("NAME")); 
     contentvalues.put("EMAIL", (String)((HashMap)arraylist.get(i)).get("EMAIL")); 
     contentvalues.put("URL", (String)((HashMap<?, ?>)arraylist.get(i)).get("URL")); 

     sqlitedatabase.insert("EMPLOYEE_TBL", null, contentvalues); 
    } 
    return; 
} 

你的表应该是这样的：

sqlitedatabase.execSQL("CREATE TABLE IF NOT EXISTS EMPLOYEE_TBL(_id INTEGER PRIMARY KEY,NAME TEXT,EMAIL TEXT,URL TEXT)");