java - 如何将 ListView 的远程图像转移到另一个布局，只需单击该项目？ ...在 Android Studio 中

Question

我制作了服务器的 ListView ，将图像发送到智能手机，并且我在那里运行的代码，结果是这样的:

现在我想做到这一点，当您单击列表中的某个项目时，可以在另一个布局中查看完整的图像，并且只能通过使用 Intent 来获取此图像。

我不明白如何在onItemClick方法中传递参数。请有人告诉我解决方案。代码是这样的:

public class MainActivity extends AppCompatActivity {

    private ListView listView;
    private ProgressDialog progressDialog;
    ArrayList asuntos=new ArrayList();
    ArrayList imagen=new ArrayList();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolBar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolBar);
        listView=(ListView) findViewById(R.id.list);
        progressDialog = new ProgressDialog(this);
        progressDialog.setCancelable(false);
        lista o=new lista();
        o.obtenerAvisos();

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                Intent intent = new Intent(MainActivity.this, Visor.class);
                startActivity(intent);
            }
        });
    }

    public class lista {

        public void obtenerAvisos() {

            asuntos.clear();
            imagen.clear();

            String tag_string_req = "req_data";

            progressDialog.setMessage("Conectando...");
            showDialog();

            StringRequest strReq = new StringRequest(Request.Method.POST, AppURLs.URL, new Response.Listener<String>() {

                @Override
                public void onResponse(String response) {

                    hideDialog();

                    try {

                        JSONArray jsonArray = new JSONArray(response);

                        for (int i = 0; i < jsonArray.length(); i++) {
                            asuntos.add(jsonArray.getJSONObject(i).getString("asunto"));
                            imagen.add(jsonArray.getJSONObject(i).getString("publicacion"));
                        }

                        listView.setAdapter(new ImagenAdaptador(getApplicationContext()));
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            }, new Response.ErrorListener() {

                @Override
                public void onErrorResponse(VolleyError error) {

                    Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();
                    hideDialog();
                }
            }) {

                @Override
                protected Map<String, String> getParams() {

                    Map<String, String> params = new HashMap<String, String>();
                    params.put("tag", "data");
                    return params;
                }

            };
            AppController.getInstance().addToRequestQueue(strReq, tag_string_req);
        }
    }

    private void showDialog() {

        if (!progressDialog.isShowing())
            progressDialog.show();
    }

    private void hideDialog() {

        if (progressDialog.isShowing())
            progressDialog.dismiss();
    }

    public class ImagenAdaptador extends BaseAdapter {

        Context ctx;
        LayoutInflater layoutInflater;
        SmartImageView smartImageView;
        TextView tvasunto;

        public ImagenAdaptador(Context applicationContext) {

            this.ctx=applicationContext;
            layoutInflater=(LayoutInflater)ctx.getSystemService(LAYOUT_INFLATER_SERVICE);
        }

        @Override
        public int getCount() {
            return imagen.size();
        }

        @Override
        public Object getItem(int position) {
            return position;
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

            ViewGroup viewGroup=(ViewGroup) layoutInflater.inflate(R.layout.activity_main_items,null);
            smartImageView=(SmartImageView)viewGroup.findViewById(R.id.imagen1);
            tvasunto=(TextView) viewGroup.findViewById(R.id.tvAsunto);
            String urlfinal="http://192.168.43.45/xxxx/xxxxx/"+imagen.get(position).toString();
            Rect rect=new Rect(smartImageView.getLeft(), smartImageView.getTop(), smartImageView.getRight(), smartImageView.getBottom());
            smartImageView.setImageUrl(urlfinal, rect);
            tvasunto.setText(asuntos.get(position).toString());
            return viewGroup;
        }
    }
}

注意:使用这些库:
com.mcxiaoke.volley:library:1.0.19
和
com.github.snowdream.android:smartimageview:0.0.2

Answer 1

在这种情况下，您不需要，您已经可以访问“imagen arrayList”:

public static final string ARG_IMAGE_URL = "URL";

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

            Intent intent = new Intent(MainActivity.this, Visor.class);
            intent.putExtras(ARG_IMAGE_URL, imagen.get(position))
            startActivity(intent);
        }
    });

但是您必须考虑一种策略来避免从网络重新加载图像，这会浪费资源。