我正在尝试使用HttpURLConnection将图像和一些字符串值从android发送到php脚本。我已成功地使用字符串，但似乎无法正确使用图像。我使用Base64（android.util.Base64）将我的图像转换为字符串来发送它。现在，我有一个单独的HttpParse.java文件，用于将我的所有信息发送到服务器，我认为这是需要进行更改以允许图像的地方，但我不确定，（我比较新java / android开发）。我已经研究了几个类似的问题，但他们并没有完全点击我的错误。另外，我测试过我成功将图像转换为字符串。这是我的代码：
编辑我得到了一点......经过测试，我得到了这个问题，因为我试图用getArguments（）获得的三个变量将返回null ...但是，我无法弄清楚如何让他们成功通过...我添加了如何启动我的片段的代码以及我如何尝试获取我的包
我的片段开始：
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_units);
Intent intent = getIntent();
LexaUser = intent.getStringExtra("UserName");
ReadOnly = intent.getStringExtra("ReadOnly");
Password = intent.getStringExtra("Password");
QA = intent.getStringExtra("QA");
SearchValue = intent.getStringExtra("SearchInput");
bottomNavigation = (BottomNavigationView)findViewById(R.id.bottom_navigation);
bottomNavigation.inflateMenu(R.menu.bottom_menu);
fragmentManager = getSupportFragmentManager();
bottomNavigation.getMenu().getItem(0).setChecked(true);
UnitDetailsHeader = findViewById(R.id.UnitDetailsViewTitle);
UnitDetailsHeader.setText(SearchValue);
UnitSizeText = findViewById(R.id.UnitSize);
UnitStatusText = findViewById(R.id.UnitStatus);
if (SearchValue.contains("-")) {
getUnitDetails(SearchValue, LexaUser);
} else {
getSiblings();
}
bottomNavigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
int id = item.getItemId();
switch (id){
case R.id.action_search:
fragment = new NewUnitStatusFragment();
break;
case R.id.action_cart:
fragment = new PendingUnitStatusFragment();
break;
case R.id.action_hot_deals:
fragment = new FinalUnitStatusFragment();
break;
case R.id.action_siblings:
fragment = new SiblingUnitFragment();
break;
}
Bundle connBundle = new Bundle();
connBundle.putString("SearchValue", SearchValue);
connBundle.putString("LexaUser", LexaUser);
connBundle.putString("Password", Password);
connBundle.putString("QA", QA);
fragment.setArguments(connBundle);
final FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.main_container, fragment).commit();
return true;
}
});
}
我试图得到我的论点:(我原来在onCreateView但后来尝试将它移到onCreate。但行为是一样的）
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
SearchValue = getArguments().getString("SearchValue");
LexaUser = getArguments().getString("LexaUser");
Password = getArguments().getString("Password");
}
}
我的片段，我获取图像并发送数据：
package [my_package];
import android.Manifest;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.Spinner;
import android.widget.SpinnerAdapter;
import android.widget.TextView;
import android.widget.Toast;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import android.util.Base64;
import java.util.HashMap;
import static android.app.Activity.RESULT_OK;
public class NewUnitStatusFragment extends Fragment {
Context newUnitStatusContext;
Activity newUnitStatusActivity;
Intent cameraIntent;
ProgressDialog progressDialog;
String ReadOnly;
String LexaUser;
String Password;
String SearchValue;
String finalResultNewUnitStatus;
String HttpURLNewUnitStatus = "https://[path/to/file]/insertNewUnitStatus.php";
HashMap<String, String> hashMapNewUnitStatus = new HashMap<>();
HttpParse httpParse = new HttpParse();
Spinner statusSpinner;
Spinner generalCauseSpinner;
EditText newUSComment;
Button addPhotoBtn;
ImageView newUnitStatusImage;
Button addNewUnitStatus;
String newUnitStatus;
String generalCause;
String newUnitStatusComment;
String newUnitStatusPhoto;
String message;
private static final int PICK_FROM_GALLERY = 1;
public NewUnitStatusFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_newunitstatus, container, false);
newUnitStatusContext = getContext();
newUnitStatusActivity = getActivity();
statusSpinner = view.findViewById(R.id.Status);
generalCauseSpinner = view.findViewById(R.id.GeneralCause);
newUSComment = view.findViewById(R.id.NewComment);
newUnitStatusImage = view.findViewById(R.id.AddPhoto);
addPhotoBtn = view.findViewById(R.id.AddPhotosLabel);
addNewUnitStatus = view.findViewById(R.id.addBtnNewUnitStatus);
ArrayAdapter<CharSequence> statusSpinnerAdapter = ArrayAdapter.createFromResource(newUnitStatusContext,
R.array.new_unit_status_array, android.R.layout.simple_spinner_item);
statusSpinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
statusSpinner.setAdapter(statusSpinnerAdapter);
newUnitStatus = statusSpinner.getSelectedItem().toString();
ArrayAdapter<CharSequence> generalCauseSpinnerAdapter = ArrayAdapter.createFromResource(newUnitStatusContext,
R.array.status_general_cause_array, android.R.layout.simple_spinner_item);
generalCauseSpinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
generalCauseSpinner.setAdapter(generalCauseSpinnerAdapter);
generalCause = generalCauseSpinner.getSelectedItem().toString();
addPhotoBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startGallery();
}
});
// Set a click listener for the text view
addNewUnitStatus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
newUnitStatus = statusSpinner.toString();
generalCause = generalCauseSpinner.toString();
newUnitStatusComment = newUSComment.toString();
if (getArguments() != null) {
SearchValue = getArguments().getString("SearchValue");
LexaUser = getArguments().getString("LexaUser");
Password = getArguments().getString("Password");
}
addNewUnitStatus(SearchValue, newUnitStatus, generalCause, newUnitStatusComment, newUnitStatusPhoto, LexaUser, Password);
}
});
return view;
}
private void startGallery() {
cameraIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
cameraIntent.setType("image/*");
cameraIntent.setAction(Intent.ACTION_GET_CONTENT);
if (cameraIntent.resolveActivity(getActivity().getPackageManager()) != null) {
startActivityForResult(cameraIntent, 1000);
} else {
Toast.makeText(newUnitStatusContext, "Error: " + cameraIntent + " - cameraIntent.resolveActivity(getActivity().getPackageManager()) = null", Toast.LENGTH_LONG).show();
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
//super method removed
if (resultCode == RESULT_OK) {
if (requestCode == 1000) {
Uri returnUri = data.getData();
try {
Bitmap bitmapImage = MediaStore.Images.Media.getBitmap(getActivity().getContentResolver(), returnUri);
newUnitStatusImage.setImageBitmap(bitmapImage);
newUnitStatusImage.buildDrawingCache();
Bitmap bm = newUnitStatusImage.getDrawingCache();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] b = baos.toByteArray();
newUnitStatusPhoto = Base64.encodeToString(b, Base64.DEFAULT);
} catch (IOException ioEx) {
ioEx.printStackTrace();
Toast.makeText(newUnitStatusContext, "ioEx Error: " + ioEx, Toast.LENGTH_LONG).show();
}
} else {
Toast.makeText(newUnitStatusContext, "Error: " + requestCode, Toast.LENGTH_LONG).show();
}
} else {
Toast.makeText(newUnitStatusContext, "Error: " + resultCode, Toast.LENGTH_LONG).show();
}
}
public void addNewUnitStatus(String searchInput, String newUnitStatus, String generalCause, String newUnitStatusComment, String newUnitStatusPhoto, String lexaUser, String password) {
class NewUnitStatusClass extends AsyncTask<String,Void,String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog = ProgressDialog.show(newUnitStatusContext, "Loading Data", null, true, true);
}
@Override
protected void onPostExecute(String httpResponseMsg) {
super.onPostExecute(httpResponseMsg);
if (httpResponseMsg != null) {
try {
JSONObject object = new JSONObject(httpResponseMsg);
message = object.getString("message");
Toast.makeText(newUnitStatusContext, httpResponseMsg, Toast.LENGTH_LONG).show();
} catch (JSONException e) {
Log.e("JSONException", "Error: " + e.toString());
Toast.makeText(newUnitStatusContext, "Error: " + e.toString(), Toast.LENGTH_LONG).show();
} // catch (JSONException e)
progressDialog.dismiss();
} else {
progressDialog.dismiss();
Toast.makeText(newUnitStatusContext, "HttpResponseMsg is null.", Toast.LENGTH_LONG).show();
}
}
@Override
protected String doInBackground(String... params) {
hashMapNewUnitStatus.put("searchinput", params[0]);
hashMapNewUnitStatus.put("newUnitStatus", params[1]);
hashMapNewUnitStatus.put("generalCause", params[2]);
hashMapNewUnitStatus.put("newUnitStatusComment", params[3]);
hashMapNewUnitStatus.put("newUnitStatusPhoto", params[4]);
hashMapNewUnitStatus.put("lexauser", params[5]);
hashMapNewUnitStatus.put("password", params[6]);
finalResultNewUnitStatus = httpParse.postRequest(hashMapNewUnitStatus, HttpURLNewUnitStatus);
return finalResultNewUnitStatus;
}
}
NewUnitStatusClass newUnitStatusClass = new NewUnitStatusClass();
newUnitStatusClass.execute(searchInput, newUnitStatus, generalCause, newUnitStatusComment, newUnitStatusPhoto, lexaUser, password);
}
}
我的代码执行HttpURLConnection：HttpParse.java
package [my_package];
import android.app.ListActivity;
import android.widget.ArrayAdapter;
import org.json.JSONArray;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
public class HttpParse extends ListActivity {
String FinalHttpData = "";
String Result;
BufferedWriter bufferedWriter;
OutputStream outputStream;
BufferedReader bufferedReader;
StringBuilder stringBuilder = new StringBuilder();
URL url;
public String postRequest(HashMap<String, String> Data, String HttpUrlHolder) {
try {
url = new URL(HttpUrlHolder);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setReadTimeout(14000);
httpURLConnection.setConnectTimeout(14000);
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoInput(true);
httpURLConnection.setDoOutput(true);
outputStream = httpURLConnection.getOutputStream();
bufferedWriter = new BufferedWriter(
new OutputStreamWriter(outputStream, "UTF-8"));
bufferedWriter.write(FinalDataParse(Data));
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
if (httpURLConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
bufferedReader = new BufferedReader(
new InputStreamReader(
httpURLConnection.getInputStream()
)
);
FinalHttpData = bufferedReader.readLine();
}
else {
FinalHttpData = "Something Went Wrong";
}
} catch (Exception e) {
e.printStackTrace();
}
return FinalHttpData;
}
public String FinalDataParse(HashMap<String,String> hashMap2) throws UnsupportedEncodingException {
for(Map.Entry<String,String> map_entry : hashMap2.entrySet()){
stringBuilder.append("&");
stringBuilder.append(URLEncoder.encode(map_entry.getKey(), "UTF-8"));
stringBuilder.append("=");
stringBuilder.append(URLEncoder.encode(map_entry.getValue(), "UTF-8"));
}
Result = stringBuilder.toString();
return Result ;
}
}
感谢所有帮助！谢谢！
P.S。我的应用显示以下错误：
W/System.err: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference
这导致了这个：
E/JSONException: Error: org.json.JSONException: End of input at character 0 of