Question

我的应用程序有两个带片段的标签。一个标签名为地图，另一个标签名为 restaurantList 。当我点击地图标记或列表中的卡片时，会打开 restaurantDetailsActivity ，其中包含有关餐馆的信息 - lat，lang，姓名，我有一个浮动动作按钮，用户应该单击它，它应该关闭当前活动并转到地图选项卡片段，到我从活动传递的位置。我尝试过很多东西而没有取得任何成功：1 2 3 4 5 6 7 {{3} } 8 ...

这就是我想要的 - 当用户点击FAB时，它应该将lat和lon从restaurantDetailsActivity， 传递到我的地图片段 < / strong>并放大到该位置（基于lat和lon），无论是从列表片段还是地图片段打开。

我的餐厅详细活动：

final String lat = restaurant.getLat(); final String lon = restaurant.getLon(); FloatingActionButton fabGoToMap = findViewById(R.id.fabGoToMap); fabGoToMap.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { // MapsFragment fragment = new MapsFragment(); // Bundle bundle = new Bundle(); // bundle.putString("lat", lat); // bundle.putString("lon", lon); // MapsFragment mapsFragment = new MapsFragment(); // mapsFragment.setArguments(bundle); // Intent restaurantDescriptionIntent = new Intent(this, MapsFragment.class); Bundle bundle = new Bundle(); bundle.putString("lat", lat); bundle.putString("lon", lon); MapsFragment fragInfo = new MapsFragment(); fragInfo.setArguments(bundle); android.support.v4.app.FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); // transaction.add(R.id.map, mapsFragment, "tag").commit(); finish(); } });

更新代码：从列表片段调用活动：

public void fetchRestaurant(String restaurantId) { ApiInterface apiService = ApiClient.getClient().create(ApiInterface.class); Call<RestaurantResponse> call = apiService.getRestaurantById(restaurantId); call.enqueue(new Callback<RestaurantResponse>() { @Override public void onResponse(Call<RestaurantResponse> call, retrofit2.Response<RestaurantResponse> response) { final Restaurant restaurant= response.body().getResults(); Intent intent = new Intent(getActivity().getApplicationContext(), AvailableRestaurantActivity.class); intent.putExtra("estaurant", estaurant); startActivity(intent); } @Override public void onFailure(Call<RestaurantResponse> call, Throwable t) { // Log error here since request failed Log.e(TAG, t.toString()); Toast.makeText(getActivity().getApplicationContext(), R.string.failed_connectivity, Toast.LENGTH_LONG).show(); } }); }

我的主要活动：

@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Toolbar toolbar = findViewById(R.id.toolbar); setSupportActionBar(toolbar); tutorialUsed = false; tutorialPage = 1; db = new SQLiteHandler(getApplicationContext()); // session manager session = new SessionManager(getApplicationContext()); if (!session.isLoggedIn()) { Intent intent = new Intent(this, LoginActivity.class); startActivity(intent); } else { List<restaurant> restaurants = new ArrayList<>(); TabLayout tabLayout = findViewById(R.id.sliding_tabs); tabLayout.addTab(tabLayout.newTab().setText(getString(R.string.tab_one))); tabLayout.addTab(tabLayout.newTab().setText(getString(R.string.tab_two))); tabLayout.setTabGravity(TabLayout.GRAVITY_FILL); tabLayout.setTabMode(TabLayout.MODE_FIXED); final ViewPager viewPager = findViewById(R.id.viewpager); PagerAdapter adapter = new PagerAdapter (getSupportFragmentManager(), tabLayout.getTabCount()); viewPager.setAdapter(adapter); viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout)); viewPager.setOffscreenPageLimit(3); tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() { @Override public void onTabSelected(TabLayout.Tab tab) { viewPager.setCurrentItem(tab.getPosition()); } @Override public void onTabUnselected(TabLayout.Tab tab) { } }); .... myUserName.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent accountIntent = new Intent(MainActivity.this, MyProfileActivity.class); startActivity(accountIntent); } }); } }

Answer 1

使用类似这样的startActivityForResult从MainActivity启动restaurantDetailactivity

startActivityForResult(intent, SHOW_DETAILS_REQUEST);

点击FAB应该是这样的

final String lat = restaurant.getLat();
final String lon = restaurant.getLon();

 FloatingActionButton fabGoToMap = findViewById(R.id.fabGoToMap);
    fabGoToMap.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent();
            Bundle bundle = new Bundle();
            bundle.putString("lat", lat);
            bundle.putString("lon", lon);
            intent.putExtras(bundle);
            setResult(Activity.RESULT_OK,intent);
        }
    });

在您的MainActivity处理活动结果中

，如下所示

@Override
protected void onActivityResult(final int requestCode,
                                final int resultCode,
                                final Intent data) {
    if (resultCode == RESULT_OK) {
        switch (requestCode) {
            case SHOW_DETAILS_REQUEST: {
                //select mapfragment as current, assuming it is at index 0
                viewpager.setCurrentItem(0);
                //add your zoom logic here in zoomToCenter method
                mapfragment.zoomToCenter(data.getStringExtra("lat"),data.getStringExtra("lon"));
            }
        }
    }
    super.onActivityResult(requestCode, resultCode, data);
}

Answer 2

Kemo，您有一个事件发生在一个片段中，并且由于该事件您希望活动将一个片段交换为第二个片段。所以你的问题是如何从片段到活动进行通信。附加的片段将为您提供活动的上下文。活动应该有一个方法来交换碎片进出，并使用你在附加中获得的上下文，你可以在碎片oncreateview中使用并运行活动的方法。here祝你好运教授

从已打开的子活动转到现有片段

2 个答案: