如何從EditText從片段獲取值到活動？

Question

我在我的MainActivity中使用了這種方法，我想在片段中的按鈕中使用這兩種方法，但我不知道如何將片段中的EditText的數據發送到活動並使用按鈕。

public void alta(View v) { 
 
     AdminSQLiteOpenHelper admin = new AdminSQLiteOpenHelper(this); 
 
     SQLiteDatabase bd = admin.getWritableDatabase(); 
 
     String nome = et1.getText().toString(); 
 
     String edad = et2.getText().toString(); 
 
     String geno = et3.getText().toString(); 
 
     String curp = et4.getText().toString(); 
 
     ContentValues registro = new ContentValues(); 
 
     registro.put("nombre", nome); 
 
     registro.put("edad", edad); 
 
     registro.put("genero", geno); 
 
     registro.put("curp", curp); 
 
     bd.insert("usuarios", null, registro); 
 
     bd.close(); 
 
     et1.setText(""); 
 
     et2.setText(""); 
 
     et3.setText(""); 
 
     et4.setText(""); 
 
     Toast.makeText(this, "Se cargaron los datos", 
 
       Toast.LENGTH_SHORT).show(); 
 
    } 
 

 
    public void modificacion(View v) { 
 
     AdminSQLiteOpenHelper admin = new AdminSQLiteOpenHelper(this); 
 
     SQLiteDatabase bd = admin.getWritableDatabase(); 
 
     String nome = et1.getText().toString(); 
 
     String edad = et2.getText().toString(); 
 
     String geno = et3.getText().toString(); 
 
     String curp = et4.getText().toString(); 
 
     ContentValues registro = new ContentValues(); 
 
     registro.put("nombre", nome); 
 
     registro.put("edad", edad); 
 
     registro.put("genero", geno); 
 
     registro.put("curp", curp); 
 
     int cant = bd.update("usuarios", registro, "curp=" + curp, null); 
 
     bd.close(); 
 
     if (cant == 1) 
 
      Toast.makeText(this, "se modificaron los datos", Toast.LENGTH_SHORT) 
 
        .show(); 
 
     else 
 
      Toast.makeText(this, "no existe un usuario con ese nombre", 
 
        Toast.LENGTH_SHORT).show(); 
 
    }

我有這樣的片段類，但我不知道如何通過EditTexts值。

public class Fragment1 extends Fragment { 
 

 
    EditText iet1,iet2,iet3,iet4; 
 

 
    @Override 
 
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { 
 
     super.onViewCreated(view, savedInstanceState); 
 
     iet1 = (EditText) getActivity().findViewById(R.id.et1); 
 
     iet2 = (EditText) getActivity().findViewById(R.id.et2); 
 
     iet3 = (EditText) getActivity().findViewById(R.id.et3); 
 
     iet4 = (EditText) getActivity().findViewById(R.id.et4); 
 
    } 
 

 
    public Fragment1() { 
 
    } 
 

 
    @Override 
 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
 
     View rootView = inflater.inflate(R.layout.fragmento1, container, false); 
 

 
     return rootView; 
 
    } 
 
}

Answer 1

首先，該活動將不會嘗試直接訪問片段內的意見（這將初步工作，但在邊緣的情況下會導致由於無效引用崩潰是非常重要的）。我建議的是在MainActivity中創建一個接口，讓片段通知活動。

public class MainActivity { 
    String textArr[4] = new String[4]; 
    public void setEditTextValue(String text, int id) { 
     textArr[id] = text; 
    } 
} 

public class Fragment1 extends Fragment { 

    public void updateData() { 
     MainActivity main = (MainActivity)getActivity(); 
     main.setEditTextValue(iet1.getText().toString(), 0); 
     main.setEditTextValue(iet2.getText().toString(), 1); 
     main.setEditTextValue(iet3.getText().toString(), 2); 
     main.setEditTextValue(iet4.getText().toString(), 3); 
     main.modificacion(); // Which doesn't need view and can just use the data saved in the array 
    } 
}