java - onActivityResult() 和 : failure delivering result resultinfo who=null request=1 result=-1 data=intent (has extras)

Question

我在一个用数据填充 Intent 的类中得到了这个方法，然后将它传递回启动该方法的 Activity 。在这里，我使用 Intent 将项目添加到 onActivityResult() 中的数据库

但正如标题所示，我遇到了“无法提供结果 resultinfo”错误。

谁能看出我为什么会收到此错误？

这是我的代码的重要部分:

来自第 1 类，接收 Intent :

    @Override
protected void onActivityResult(int reqCode, int resCode, Intent data){
    super.onActivityResult(reqCode, resCode, data);

    if(reqCode == ENTER_DATA_REQUEST_CODE && resCode == RESULT_OK){
        hkDBhelper.addItem(data.getExtras().getString("tag_grocery_foodItem"),
                            data.getExtras().getString("tag_grocery_weight"),
                            data.getExtras().getString("tag_grocery_price"),
                            data.getExtras().getString("tag_grocery_brand"),
                            data.getExtras().getString("tag_grocery_category"));
        hkCursorA.changeCursor(hkDBhelper.listAll());
    }
}

编辑:添加:

    @Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();
    if (id == R.id.addItem) {
        startActivityForResult(new Intent(this, AddFood.class), ENTER_DATA_REQUEST_CODE);
        return true;
    }
    return super.onOptionsItemSelected(item);
}

第 2 类，发送 Intnet:

    public void addItem(){
    setFood = itemFood.getText().toString();
    setWeight = itemWeight.getText().toString();
    setPrice = itemPrice.getText().toString();
    setBrand = itemBrand.getText().toString();
    setCategory = catagorySpinner.getSelectedItem().toString();


    if(setFood.length() != 0 && setWeight.length() != 0 && setPrice.length() != 0
            && setBrand.length() != 0 && setCategory.length() != 0){
        Intent newIntent = getIntent();
        newIntent.putExtra("tag_grocery_foodItem", setFood);
        newIntent.putExtra("tag_grocery_weight", setWeight);
        newIntent.putExtra("tag_grocery_price", setPrice);
        newIntent.putExtra("tag_grocery_brand", setBrand);
        newIntent.putExtra("tag_grocery_category", setCategory);

        this.setResult(RESULT_OK, newIntent);
        finish();
    }
}

这是来自 logcat 的一些行:

10-29 09:28:23.569: E/AndroidRuntime(32565): java.lang.RuntimeException: Failure delivering result
ResultInfo{who=null, request=1, result=-1, data=Intent { cmp=com.example.s188094_mappe3/.AddFood
(has extras) }} to activity {com.example.s188094_mappe3/com.example.s188094_mappe3.MainActivity}:
java.lang.NullPointerException

Answer 1

尝试这种方式，希望这能帮助您解决问题。

有两种方式向/从另一个 Activity 发送/获取数据

1.向 Intent 添加数据。

怎么放:

Intent newIntent = new Intent();
newIntent.putExtra("tag_grocery_foodItem", setFood);
newIntent.putExtra("tag_grocery_weight", setWeight);
newIntent.putExtra("tag_grocery_price", setPrice);
newIntent.putExtra("tag_grocery_brand", setBrand);
newIntent.putExtra("tag_grocery_category", setCategory);
setResult(RESULT_OK, newIntent);
finish();

获取方式:

if(reqCode == ENTER_DATA_REQUEST_CODE && resCode == RESULT_OK){
   hkDBhelper.addItem(data.getStringExtra("tag_grocery_foodItem"),
   data.getStringExtra("tag_grocery_weight"),
   data.getStringExtra("tag_grocery_price"),
   data.getStringExtra("tag_grocery_brand"),
   data.getStringExtra("tag_grocery_category"));
   hkCursorA.changeCursor(hkDBhelper.listAll());
}

2.将数据添加到bundle并将bundle添加到intent。

怎么放:

Intent newIntent = new Intent();
Bundle bundle = new Bundle();
bundle.putString("tag_grocery_foodItem", setFood);
bundle.putString("tag_grocery_weight", setWeight);
bundle.putString("tag_grocery_price", setPrice);
bundle.putString("tag_grocery_brand", setBrand);
bundle.putString("tag_grocery_category", setCategory);
newIntent.putExtras(bundle);
setResult(RESULT_OK, newIntent);
finish();

获取方式:

if(reqCode == ENTER_DATA_REQUEST_CODE && resCode == RESULT_OK){
   hkDBhelper.addItem(data.getExtras().getString("tag_grocery_foodItem"),
   data.getExtras().getString("tag_grocery_weight"),
   data.getExtras().getString("tag_grocery_price"),
   data.getExtras().getString("tag_grocery_brand"),
   data.getExtras().getString("tag_grocery_category"));
   hkCursorA.changeCursor(hkDBhelper.listAll());
}