Question

我在尝试返回对象时遇到错误。该错误来自onClick函数，该函数转到ProductActivity。我试图通过参数传递产品ID数据，我做错了或为什么我得到这个错误？错误是：

android.content.ActivityNotFoundException：无法找到显式活动课 {com.example.cmd.testproject / com.example.cmd.testproject.Fragments.ProductFragment}; 你有没有在AndroidManifest.xml中声明这个活动？

            public class ProductListHolder extends RecyclerView.ViewHolder implements
            View.OnClickListener {
                private TextView mTitle,mDesc,mPrice;
                private ImageView imageView;

                private Product mProduct;

                public void bind(Product product) {
                    this.mProduct = product;
                    mTitle.setText(product.getTitle());
                    mDesc.setText(product.getDesc());
                    mPrice.setText(product.getPrice());
                    //TODO: Set Image
                }

                public ProductListHolder(LayoutInflater inflater, ViewGroup parent) {
                    super(inflater.inflate(R.layout.list_item,parent,false));
                    mTitle = (TextView) itemView.findViewById(R.id.title);
                    mDesc = (TextView) itemView.findViewById(R.id.description);
                    mPrice = (TextView) itemView.findViewById(R.id.price);
                    itemView.setOnClickListener(this);
        //            imageView = (ImageView) itemView.findViewById(R.id.imgUrl);

                }

                @Override
                public void onClick(View v) {
                    Intent i = ProductActivity.newIntent(ctx,mProduct.getId());
                    ctx.startActivity(i);
                }
            }

        }

public class ProductActivity extends SingleFragmentActivity {
    public static final String PRODUCT_ID = "com.example.cmd.testproject.Activitys.productId";

    @Override
    protected Fragment createFragment() {
        UUID id = (UUID)getIntent().getSerializableExtra(PRODUCT_ID);
        return ProductFragment.newInstance(id);
    }

    public static Intent newIntent(Context ctx, UUID prodID) {
        Intent i = new Intent(ctx, ProductFragment.class);
        i.putExtra(PRODUCT_ID,prodID);
        return i;
    }
}

public class ProductFragment extends Fragment {
    private static final String ARGUMENT_PROD_ID = "prod_id";

    private TextView mTitle,mDesc,mImgUrl,mPrice;
    private List<Product> mProducts;
    private Product product;



               @Override
                protected Fragment createFragment() {
                    UUID id = (UUID)getIntent().getSerializableExtra(PRODUCT_ID);
                    return ProductFragment.newInstance(id);
                }

                public static Intent newIntent(Context ctx, UUID prodID) {
                    Intent i = new Intent(ctx, ProductFragment.class);
                    i.putExtra(PRODUCT_ID,prodID);
                    return i;
                }
            }


           public static Fragment newInstance(UUID productID) {
                Bundle args = new Bundle();
                args.putSerializable(ARGUMENT_PROD_ID,productID);
                ProductFragment frag = new ProductFragment();
                frag.setArguments(args);
                return frag;
            }

            public ProductFragment() {}

            @Override
            public void onCreate(@Nullable Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);

                UUID id = (UUID) getArguments().getSerializable(ARGUMENT_PROD_ID);
                product = ProductHolder.get(getActivity()).getProduct(id);

            }

            @Nullable
            @Override
            public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
                View v = inflater.inflate(R.layout.product_fragment,container,false);
                setWidgets(v);
                return v;
            }

            private void setDataOnText(){
                mTitle.setText(product.getTitle());
                mDesc.setText(product.getDesc());
                mPrice.setText(product.getPrice());
            }

            private void setWidgets(View v) {
                mTitle = (TextView) v.findViewById(R.id.title);
                mDesc = (TextView) v.findViewById(R.id.desc);
                mPrice = (TextView) v.findViewById(R.id.price);
            }

清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.cmd.testproject">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".Activitys.ProductActivity">
        </activity>
        <activity android:name=".Activitys.ProductListActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

Answer 1

ProductFragment是一个片段而不是activity.You不能使用intent加载片段。更改newIntent方法来加载片段。

/products/45342

在适配器项目单击后返回对象

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