Question

嘿，我有一个使用此适配器的listfragment：

    public class F1_fr extends ListFragment {
   View rootview;



    @Override

    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        rootview=inflater.inflate(R.layout.f1_lay,container,false);
        rootview.findViewById(R.id.semi_transparent).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent=new Intent(getActivity(),MainActivity2.class);
                startActivityForResult(intent, 2);

            }
        });


        return rootview;

    }


    public void onActivityResult(int requestCode, int resultCode, Intent data)
    {
        super.onActivityResult(requestCode, resultCode, data);
        // check if the request code is same as what is passed  here it is 2
        if(requestCode==2)
        {
            String message=data.getStringExtra("MESSAGE");
            aa.add(message);
        }
    }





    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        final String[] items = getResources().getStringArray(R.array.heroes);
        ArrayAdapter<String> aa = new ArrayAdapter<String>(getActivity(),
                android.R.layout.simple_list_item_1, items);

        setListAdapter(aa);




    }

}

以及我从编辑文本中获得结果的活动：

public class ajout extends ActionBarActivity {

EditText editText1;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_ajout);
    editText1=(EditText)findViewById(R.id.editText1);

}

public void btn (View view)


{
    String message=editText1.getText().toString();
    Intent intent=new Intent();
    intent.putExtra("MESSAGE",message);
    setResult(2,intent);
    finish();

}

它解决但现在我有这个错误： Failure delivering result ResultInfo{who=null, request=131074, result=2, data=Intent { (has extras) }}

Answer 1

变量aa在当前范围内不可用。这应该是您的问题的解决方案：

public class F1_fr extends ListFragment {
  View rootview;
  ArrayAdapter<String> aa;


  public void onActivityResult(int requestCode, int resultCode, Intent data)
  {
    if(requestCode == 2)
    {
        String message=data.getStringExtra("MESSAGE");
        aa.add(message);
    } 
    else 
    {
        super.onActivityResult(requestCode, resultCode, data); 
    }
  }

  @Override
  public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    final String[] items = getResources().getStringArray(R.array.heroes);
    aa = new ArrayAdapter<String>(getActivity(),
            android.R.layout.simple_list_item_1, items);

    setListAdapter(aa);
  }
}

从结果listfragment Android Studio获取活动

1 个答案: