在 onActivityResult 中，我从收到的意图中得到空值

Question

我有两个活动：A 和 B。

In activity A：在 "btn_navSimilarColor" buttonClick 上 - 我用 startActivityForResult 调用了 B。 A 中已经有一些使用相机和图库的意图以及我从之前的 activity 收到的意图数据。

在 activity B 中：我在 onCreate() 中调用了 asyncTask，在 asyncTask 的 onPostExecute() 中，我将额外的意图发送回 Activity A。

Activity答：

public class A extends Activity 
{
...
@Override
public void onCreate(Bundle savedInstanceState)
{
  ...
  Bundle extras = getIntent().getExtras();
    if (extras != null) {
        edtTxtColorCode.setText(extras.getString("xtra_selectedColor"));
    } else {
        Toast.makeText(this, "There was a problem in the response!", Toast.LENGTH_SHORT).show();
    }
}


public void buttonOnClick(View view)
{
    switch (view.getId())
    {
        case R.id.btnCamera:
            startActivityForResult(new Intent(MediaStore.ACTION_IMAGE_CAPTURE), FLAG_CAMERA);

            break;

        case R.id.btnGallery:
            startActivityForResult(
                    new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI),  FLAG_GALLERY);
            break;

        case R.id.btn_navSimilarColor:
            Intent intnt_similar = new Intent(A.this, B.class);
            intnt_similar.putExtra("xtraColor", edtTxtColorCode.getText().toString());
            startActivityForResult(intnt_similar, FLAG_navSimilarColorAct);

            break;

        default:
            break;
    }

}


@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    Log.v("resultCode","="+resultCode);
    if (resultCode == Activity.RESULT_OK)
    {
        mCursor = null;
        if (requestCode == FLAG_GALLERY)
            onSelectFromGalleryResult(data);
        else if (requestCode == FLAG_CAMERA)
            onCaptureImageResult(data);
        else if(requestCode == FLAG_navSimilarColorAct)
        {   Bundle extras = getIntent().getExtras();
            String stt = extras.getString("intnt_similarColor");
            if (extras != null)

edtTxtColorCode.setText(extras.getString("intnt_similarColor"));
        }
    }
}
 }

Activity乙：

public class B extends Activity 
{
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
    ....
     receiveIntent();
     new AsyncConver().execute();

    }

    private void receiveIntent() {
    Bundle extras = getIntent().getExtras();
    if (extras != null)
        strIntentrecvdColor = extras.getString("xtraColor");
    else
        Toast.makeText(this, "There was a problem in the response!", Toast.LENGTH_SHORT).show();
    }

     class AsyncConvert extends AsyncTask<String, Integer, String>
    {
    ...
     @Override
    protected void onPostExecute(String s) 
    {
        super.onPostExecute(s);

         Custom_SimilarColorListAdapter gridAdapter = new Custom_SimilarColorListAdapter(SimilarColors.this, list_SimilarColors);
        grdVw.setAdapter(gridAdapter);

        grdVw.setOnItemClickListener(new AdapterView.OnItemClickListener()
        {
        @Override
        public void onItemClick(AdapterView<?> parent, View v, int position, long id)
        {
            String str_colorCodeSimilar = ((TextView) v.findViewById(R.id.listrow_similar_code)).getText().toString();
            Toast.makeText(getApplicationContext(), "ID:: "+ str_colorCodeSimilar , Toast.LENGTH_SHORT).show();

            Intent retrnIntnt = new Intent();
            retrnIntnt.putExtra("intnt_similarColor", str_colorCodeSimilar);
            setResult(RESULT_OK, retrnIntnt);
            finish();

        }
        });

        }
    }

}

问题：

现在的问题是我正在 activity B 中获取数据 - 因为我已经用

检查了它

Toast.makeText(getApplicationContext(), "ID:: "+ str_colorCodeSimilar , Toast.LENGTH_SHORT).show();

但是在 Activity A 的Activity结果中，我没有得到 "intnt_similarColor" 的捆绑包额外数据，即：

    String stt = extras.getString("intnt_similarColor");

相反，我在 onCreate().

中获得 "xtra_selectedColor" 的额外捆绑包

为什么会这样，我如何获取以前的捆绑数据，而不是从 activity B 传递过来的数据？

Answer 1

将Bundle extras = getIntent().getExtras();更改为Bundle extras = data.getExtras();

Answer 2

从您从 onActivityResult 收到的数据意图中获取字符串。您使用 Bundle extras = getIntent().getExtras();，其中 getIntent() 实际上是 class A 收到的意图。

所以你必须使用：

String stt = data.getStringExtra("intnt_similarColor");

在 onActivityResult 中，我从收到的意图中得到空值

In onActivityResult i am getting null value from received intent

android

android-intent

android-bundle