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;

@Override

protected 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！