android - 无法在新 Activity 中传递对象数组

Question

我根据用户输入在一个 fragment “最近”中显示一个 ListView 。现在，我想将该 ListView 作为对象数组传递给容器 Activity (主 Activity )(我正在使用界面传递数据)，然后当用户单击 MainActivity 中的按钮时，该数组列表将传递给另一个 Activity ，它将再次成为显示为 ListView。当我运行应用程序时，它显示错误“应用程序已停止”。在 logcat 中也没有显示错误。请帮助。

1. My relevant code of interface in Fragment:


        @Override
            public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                     Bundle savedInstanceState) {

                View view=inflater.inflate(R.layout.fragment_one, container, false);                mListView=(ListView)view.findViewById(R.id.myListView);

              placeList.add(new Place("Shoppers Stop (1st Floor)", "Get 10% Off on Clothes & Jewellery", "shop1"));
                                    placeList.add(new Place("Dominos (2nd Floor)", "Get 10% Off on Chef Special Pizzas", "shop2"));
                                    placeList.add(new Place("More MegaStore (3rd Floor)", "Wednesday Bazaar, Get min 10% Off","shop4"));
                          mPlaces=placeList.toArray(new Place[placeList.size()]);//Convert arraylist to array
                          passData(mPlaces);//Pass Array of objects for interface


            mPlaceAdapter = new PlaceAdapter(getActivity(), R.layout.row, mPlaces);

                            if (mListView != null) {
                                mListView.setAdapter(mPlaceAdapter);\\Creating listview in fragment
                            }

        // Inflate the layout for this fragment
                return view;
            }


    //Inetrface definition
         public interface OnDataPass {
                public void onDataPass(Place[] data);
            }

            OnDataPass dataPasser;

            @Override
            public void onAttach(Context context) {
                super.onAttach(context);
                dataPasser = (OnDataPass) context;
            }

            @Override
            public void onDetach() {
                super.onDetach();
                dataPasser=null;
            }

            public void passData(Place[] data) {
                dataPasser.onDataPass(data);
            }
        }

        2. Main Activity (Container of fragement):
      @Override
        public void onDataPass(Place []data) {

            Collections.addAll(allOffers,data);

        }


            @Override
            public boolean onOptionsItemSelected(MenuItem item) {

                switch(item.getItemId()){
                            case R.id.all:
                        Intent intent = new Intent(MainActivity.this, AllOffersActivity.class);
                        intent.putExtra("AllOffers", (ArrayList<Place>)allOffers);
                        getApplication().startActivity(intent);
                        return true;
                            default: return super.onOptionsItemSelected(item);

                }

            }

    3. AllOffersActivity Class (where again I want to show listviews):


                        @Override
                        protected void onCreate(Bundle savedInstanceState) {
                            super.onCreate(savedInstanceState);
                            setContentView(R.layout.activity_alloffers);
                          onePlaces=(ArrayList<Place>)getIntent().getSerializableExtra("AllOffers");
                            if(onePlaces!=null) {
                                mPlaces = onePlaces.toArray(new Place[onePlaces.size()]);//To store data into an array 

                            }

                            allPlaceAdapter = new PlaceAdapter(AllOffersActivity.this, R.layout.row, mPlaces);
                            allListView=(ListView)findViewById(R.id.allListView);

                            if (allListView != null) {
                                allListView.setAdapter(allPlaceAdapter);
                            }

                        }
                    }

    4. AndroidManifest.xml:

        <activity android:name=".activity.MainActivity">
                    <intent-filter>
                        <action android:name="android.intent.action.MAIN"/>

                        <category android:name="android.intent.category.LAUNCHER"/>
                    </intent-filter>
         </activity>

                <activity android:name=".activity.AllOffersActivity"/>

1. Images-i) 在 fragment 中显示 ListView 的图像，当用户单击底部的“星号”图标时，新 Activity 应显示在 fragment 中显示的 ListView

Answer 1

按照步骤传递一组用户定义的对象。

第 1 步: 公共(public)类 Place 实现 Serializable

第 2 步:在将数据传递给其他类的 Activity 中修改以下内容

Intent data = new Intent(MainActivity.this, AllOffersActivity.class);
data.putExtras("AllOffers", (Serializable) allOffers);
startActivity(data);

第三步:接收类

if(getIntent() != null) {
getIntent().getSerializableExtra("AllOffers");
}

试试这个。