PDF 下载或意图

Question

我RecyclerView用它从 Cloud FirestoreCardViews中检索了两个TextViews，每当我点击卡片时，我希望它根据pdfUrl存储在我的 Firestore 数据库中，使用 pdf 打开活动或将 pdf 下载到手机。但我不知道如何实现这一目标。我的代码：public class RecylerViewTestsActivity extends AppCompatActivity {RecyclerView recyclerView;private FirebaseFirestore db = FirebaseFirestore.getInstance();private FirestoreRecyclerAdapter<uploadTests, TestesViewHolder> adapter;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.recyler_view_tests);    RecyclerView recyclerView = findViewById(R.id.recyclerViewTests);    recyclerView.setLayoutManager(new LinearLayoutManager(this));    FirebaseFirestore rootRef = FirebaseFirestore.getInstance();    Query query = rootRef.collection("FilterPDFUploads");    FirestoreRecyclerOptions<uploadTests> options = new FirestoreRecyclerOptions.Builder<uploadTests>()            .setQuery(query, uploadTests.class)            .build();    adapter = new FirestoreRecyclerAdapter<uploadTests,TestesViewHolder >(options) {        @Override        protected void onBindViewHolder(@NonNull TestesViewHolder holder, int position, @NonNull uploadTests model) {            holder.setTestesDesc(model.getDescription());            holder.setTestesName(model.getUsername());        }        @NonNull        @Override        public TestesViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.pdf_tests_items, parent, false);            return new TestesViewHolder(view);        }    };    recyclerView.setAdapter(adapter);}//////////////////////////VIEW HOLDER////////////////////////////////////////////private class TestesViewHolder extends RecyclerView.ViewHolder {    private View view;    private CardView itemsCard;    TestesViewHolder(final View itemView) {        super(itemView);        view = itemView;    }

Answer 1

每当我点击卡片时，我希望它基于存储在我的 firestore 数据库中的 pdfUrl，使用 pdf 打开活动或将 pdf 下载到手机

为了解决这个问题，你应该setOnClickListener()在你的TestesViewHolder对象上使用。在点击监听器中，请添加以下代码行：

Uri uri = Uri.parse(url);

Intent intent = new Intent(Intent.ACTION_VIEW, uri);

startActivity(intent);

url存储在数据库中的实际 url在哪里。而已！