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
最佳答案
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());
}
关于java - onActivityResult() 和 : failure delivering result resultinfo who=null request=1 result=-1 data=intent (has extras),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/26625741/