android How to refresh my main activity after updating database?

Question

I have three activities,the first one is used to hold some values from database,and a list view was showed on the second one,when i click any item in that list view I'll be jumping to the third activity and able to edit the item i selected,after updating the data in the database,new datas will be shown in the second activity,but when I return to the first one,nothing was refreshed.How can I get the updated data in the first activity too? Any help will be appreciated.

The second activity code:

    import android.content.ContentValues;
    import android.content.Context;
    import android.content.Intent;
    import android.database.Cursor;
    import android.database.sqlite.SQLiteDatabase;
    import android.os.Bundle;
    import android.support.v7.app.AppCompatActivity;
    import android.util.Log;
    import android.view.Menu;
    import android.view.MenuInflater;
    import android.view.MenuItem;
    import android.view.View;
    import android.widget.AdapterView;
    import android.widget.ListAdapter;
    import android.widget.ListView;
    import android.widget.Toast;

    public class SetupActivity extends AppCompatActivity {

        private Context context;
        static String extra = "values";
        ListView mListView;

        final String[] setItems = {"name","birthday","type","sex"};

        @Override
        public void onCreate(Bundle savedInstance){
            super.onCreate(savedInstance);
            setContentView(R.layout.setuplist);
            mListView = (ListView)findViewById(R.id.listview);

            context = this;
            updateView();

        }

        private void updateView(){
            DogDatabaseHelper dbHelper= new DogDatabaseHelper(getApplicationContext());
            SQLiteDatabase db = dbHelper.getWritableDatabase();
            Cursor cursor = db.query("Dog",null,null,null,null,null,null,null);
            if(cursor.moveToFirst()){
                String name = cursor.getString(cursor.getColumnIndex("name"));
                String birthday = cursor.getString(cursor.getColumnIndex("birthday"));
                String size = cursor.getString(cursor.getColumnIndex("size"));
                String sex = cursor.getString(cursor.getColumnIndex("sex"));

                final String[] setValues = {name,birthday,size,sex};
                ListAdapter listAdapter = new CustomAdapter(this,setItems,setValues);
                mListView.setAdapter(listAdapter);

                mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                    @Override
                    public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
                        String setupItemValue = setValues[position];
                        String setupItem = setItems[position];
                        Intent intent;
                        if(setupItem.equals("name")){
                            intent = new Intent(SetupActivity.this,ChangeName.class);
                            intent.putExtra(extra,setupItemValue);
                            startActivityForResult(intent,1);
                        } else if(setupItem.equals("birthday")){
                            intent = new Intent(SetupActivity.this,ChangeBirthday.class);
                            intent.putExtra(extra,setupItemValue);
                            startActivityForResult(intent,2);
                        }else if(setupItem.equals("type")){
                            intent = new Intent(SetupActivity.this,ChangeType.class);
                            intent.putExtra(extra,setupItemValue);
                            startActivityForResult(intent,3);
                        }else{
                            intent = new Intent(SetupActivity.this,ChangeSex.class);
                            intent.putExtra(extra,setupItemValue);
                            startActivityForResult(intent,4);
                        }

                    }
                });
            }
            cursor.close();
        }

        @Override
        protected void onActivityResult(int requestCode,int resultCode,Intent data){

            DogDatabaseHelper dbHelper= new DogDatabaseHelper(getApplicationContext());
            SQLiteDatabase db = dbHelper.getWritableDatabase();
            Cursor cursor = db.query("Dog",null,null,null,null,null,null,null);
            switch (requestCode){
                case 1:
                    if (resultCode == RESULT_OK){

                        ContentValues cv = new ContentValues();
                        cv.put("name",data.getStringExtra("return_name"));
                        db.update("dog",cv,"id=?",new String[]{"1"});

                    }
                    break;
                case 2:
                    Toast.makeText(this, "Update2", Toast.LENGTH_SHORT).show();
                    if(resultCode == RESULT_OK){
                        ContentValues cv = new ContentValues();
                        cv.put("birthday",data.getStringExtra("return_birthday"));
                        db.update("dog",cv,"id=?",new String[]{"1"});

                    }
                    break;
                case 3:
                    Toast.makeText(this, "Update3", Toast.LENGTH_SHORT).show();
                    if(resultCode == RESULT_OK){
                        ContentValues cv = new ContentValues();
                        cv.put("size",data.getStringExtra("return_type"));
                        db.update("dog",cv,"id=?",new String[]{"1"});
                    }
                    break;
                case 4:

                    if(resultCode == RESULT_OK){
                        ContentValues cv = new ContentValues();
                        cv.put("sex",data.getStringExtra("return_sex"));
                        Toast.makeText(this, data.getStringExtra("return_sex"), Toast.LENGTH_SHORT).show();
                        int r = db.update("dog",cv,"id=?",new String[]{"1"});
                        if(r != 1){
                            Toast.makeText(this, "Update3", Toast.LENGTH_SHORT).show();
                        }
                    }
                    break;

            }
            db.close();
            updateView();
        }

        @Override
        public boolean onCreateOptionsMenu(Menu menu){
            MenuInflater inflater = getMenuInflater();
            inflater.inflate(R.menu.add,menu);
            return true;
        }
        @Override
        public boolean onOptionsItem

    Selected(MenuItem item){
            int id = item.getItemId();
            if(id == R.id.add){

            }
            return super.onOptionsItemSelected(item);
        }
    }

Answer 1

You should open the second activity with startActivityForResult(intent,requestCode) and then you can implement onActivityResult(...) in the first one where you can fetch the data from db once more and refresh the views.