Question

如何将来自ListView的subjetfile.getSubjectID值传递给另一个为SubjectActivity的活动，以便$ id = $ _ GET [＆＃39; subjectID＆＃39;];在我的PHP代码赢了不是？有人可以帮忙吗？我有一个listView里面的主题列表，当我点击listView中的任何项目时，我想将它传递给SubjectActivity，并且活动显示主题的细节，但是由于$，php代码似乎无法正常工作ID。如果有人可以提供帮助，我将不胜感激，谢谢！

＆＃13;

public class SubjectActivity extends AppCompatActivity {
    private ImageView imageViewDefault;
    private TextView textViewDefaultName;
    private TextView textViewDefaultDescription1;
    private TextView textViewDefaultDescription2;
    private static final String GET_URL_SUBJECT = "https://arlearn.000webhostapp.com/getSubject.php";
    private static final int TAG1 = 1;
    private ProgressDialog pDialog;
    private subjectFile subjectfile;
    private String result = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_subject);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        imageViewDefault = (ImageView)findViewById(R.id.imageViewSubject);
        textViewDefaultName = (TextView)findViewById(R.id.textViewName);
        textViewDefaultDescription1 = (TextView)findViewById(R.id.textViewContent1);
        textViewDefaultDescription2 = (TextView)findViewById(R.id.textViewContent2);
        pDialog = new ProgressDialog(this);
    }

    public boolean onCreateOptionsMenu(Menu menu)
    {
        getMenuInflater().inflate(R.menu.subject, menu);
        return true;
    }

    public boolean onOptionsItemSelected(MenuItem item)
    {
        int id = item.getItemId();
        if(id == R.id.action_refresh) {
            getSubjectContent(getApplicationContext(), GET_URL_SUBJECT);
        }
        return super.onOptionsItemSelected(item);
    }

    private void getSubjectContent(Context context, String url) {
        RequestQueue request = Volley.newRequestQueue(context);

        if (!pDialog.isShowing())
            pDialog.setMessage("Syn with server...");
        pDialog.show();


        JsonArrayRequest requestsubject = new JsonArrayRequest(url,
                new Response.Listener<JSONArray>() {
                    @Override
                    public void onResponse(JSONArray response) {
                        try {
                            for (int i = 0; i < response.length(); i++) {

                                JSONObject subjectResponse = (JSONObject) response.get(i);
                                String name = subjectResponse.getString("name");
                                String image = subjectResponse.getString("image");
                                String description1 = subjectResponse.getString("Description1");
                                String description2 = subjectResponse.getString("Description2");
                                subjectfile = new subjectFile(name, image, description1, description2);
                            }
                            loadFile();
                            if (pDialog.isShowing())
                                pDialog.dismiss();
                        }catch(Exception e)
                        {
                            Toast.makeText(getApplicationContext(), "Error:" + e.getMessage(), Toast.LENGTH_LONG).show();
                            e.printStackTrace();
                        }
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Log.i("tagconvertstr", "["+result+"]");
                Toast.makeText(getApplicationContext(), "Error" + error.getMessage(), Toast.LENGTH_LONG).show();
                error.printStackTrace();
                if (pDialog.isShowing())
                    pDialog.dismiss();
            }
        }
    );
        request.add(requestsubject);
    }

    private void loadFile() {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] imageBytes = baos.toByteArray();
        imageBytes = Base64.decode(subjectfile.getImage(), Base64.DEFAULT);
        Bitmap decodeImage = BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length);
        imageViewDefault.setImageBitmap(decodeImage);
        textViewDefaultName.setText(subjectfile.getName());
        textViewDefaultDescription1.setText(subjectfile.getDescription1());
        textViewDefaultDescription2.setText(subjectfile.getDescription2());
    }

}

＆＃13;

<?php
	include("connection1.php");

	// connecting to db
	$conn = mysqli_connect($hostname_localhost, $username_localhost, $password_localhost, $database_localhost);

	/* check connection */
	if (mysqli_connect_errno()) {
		echo "Error: Connect failed: %s\n";
		exit();
	}

	$response = array();
	

	$id=$_GET['subjectID'];
	
	$query = "SELECT image, name, Description1, Description2 from subject WHERE subjectID = ".$id;
	
	
	/* Select queries return a resultset */
	if ($result = mysqli_query($conn, $query))
	{
	    $response = array();
	    
	    while ($row = mysqli_fetch_array($result))
	    {
	        $item = array();
	        $item["image"] = base64_encode($row["image"]);
		    $item["name"] = $row["name"];
		    $item["Description1"] = $row["Description1"];
		    $item["Description2"] = $row["Description2"];
		    array_push($response, $item);
	    }
	    mysqli_free_result($result);
	}

	else{
	    $response["success"] = 0;
        $response["message"] = "Required field(s) is missing";
	}
	
	echo json_encode($response);
	/* close connection */
	mysqli_close($conn);
?>

＆＃13;

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                subjectFile subjectfile = imageAdapter.getItem(position);
                Log.i("Database", subjectfile.getSubjectID());
                Intent intent = new Intent(getActivity(), SubjectActivity.class);
                startActivity(intent);
            }
        });

＆＃13;

Answer 1

跟着它 -

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                subjectFile subjectfile = imageAdapter.getItem(position);
                Log.i("Database", subjectfile.getSubjectID());
                Intent intent = new Intent(getActivity(), SubjectActivity.class);
intent.putExtra("subject_id", subjectfile.getSubjectID());
startActivity(intent);
            }
        });

使用SubjectActivity活动的onCreate()方法访问该意图。

String subjectId = getIntent().getStringExtra("subject_id");

如何将值从一个活动传递到另一个活动

1 个答案: