Question

我在创建调用异步任务的活动。

public class Sync extends BaseActivity implements OnClickListener{

    @Override
    public void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sync);
        CheckForDeviceTask(Sync.this).execute(Constants.DEVICE_ADDRESS);
    }
}

现在，异步任务的结果决定了在我能够做的活动中加载哪个片段。但无法想象如何更新片段内的textviews。请看一下onPostExecute（）方法。加载片段后，如何根据结果更新TextViews？

public class CheckForDeviceTask extends AsyncTask<String, Integer, String> {
    private static final String TAG = "CheckForDeviceTask";
    public static final int CONNECTED_DEVICE_EXISTS = 1;
    public static final int WAITING_TEMP_PASSWORD = 2;
    private Activity activity;

    // private DialogFragment dialogFragment;

    public CheckForDeviceTask(Activity activity) {
        super();
        this.activity = activity;
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        // FragmentManager fm = activity.getFragmentManager();
        // dialogFragment = ProgressDialogFragment.newInstance("Saving");
        // dialogFragment.show(fm, "dialog");
    }

    @Override
    protected String doInBackground(String... params) {
        if (GCHUtils.isConnected(activity)) {
            return GCHUtils.httpGet(RestApiPaths.CHECK_FOR_DEVICE
                    + params[0].toString());
        }
        return null;
    }

    @Override
    protected void onPostExecute(String result) {
        // dialogFragment.dismiss();
        try {
            if (result != null && !result.isEmpty()) {
                Map<String, Object> resultMap = MapUtility.jsonToMap(result);
                if (resultMap != null && !resultMap.isEmpty()) {
                    Log.d(TAG, resultMap.get("status").toString());
                    FragmentManager fm;
                    FragmentTransaction ft;
                    if (Boolean.valueOf(resultMap.get("status").toString())) {
                        int type = Integer.valueOf(resultMap.get("type")
                                .toString());
                        switch (type) {
                        case CONNECTED_DEVICE_EXISTS: {
                            GCHConnectedFragment connectedGCHFragment = new GCHConnectedFragment();
                            fm = activity.getFragmentManager();
                            ft = fm.beginTransaction();
                            ft.replace(R.id.layoutToReplace,
                                    connectedGCHFragment);
                            ft.commit();
                            String email = resultMap.get("emailId").toString();
                            String name = resultMap.get("name").toString();
                            // now I need to update two TextViews in GCHConnectedFragment based with these values  
                        }
                            break;
                        case WAITING_TEMP_PASSWORD: {

                            TempPasswordFragment tempPasswordFragment = new TempPasswordFragment();
                            fm = activity.getFragmentManager();
                            ft = fm.beginTransaction();
                            ft.replace(R.id.layoutToReplace,
                                    tempPasswordFragment);
                            ft.commit();
                            String tempPassword = resultMap.get("tempPassword")
                                    .toString(); // TODO: encrypt
                            String expiryDate = resultMap.get("expiryDate")
                                    .toString();
//                          now I need to update two TextViews in tempPasswordFragment based with these values
                        }
                            break;
                        }
                    } else {
                        // TODO: init UI with connect with GCH option
                        ConnectGCHFragment connectGCHFragment = new ConnectGCHFragment();
                        fm = activity.getFragmentManager();
                        ft = fm.beginTransaction();
                        ft.replace(R.id.layoutToReplace, connectGCHFragment);
                        ft.commit();
                    }
                }
            }

        } catch (Exception e) {
            Log.d(TAG, e.getMessage());
        }
    }
}

Answer 1

首先将您获得的数据（例如电子邮件和名称）放在一个包中，然后将包作为参数发送到目标片段，如下所示： -

          `Bundle bundle = new Bundle();
            bundle.putSerializable("email ", email );
            bundle.putBoolean("name", name);
            fragment.setArguments(bundle);`

在目的地Fragment中获取如下数据：

                  `String email=getArguments().getString("email");
                   String name=getArguments().getString("name");`

基于asyntask结果更新不同片段的文本视图

1 个答案: