我正在使用 okhttp 进行网络请求和响应。我在网上搜索了很多关于此问题的 github ，但我没有得到任何干净的解决方案，我不知道代码中有什么问题。当我点击 Btn_Proceed 时，我收到 NullPointerException 。提供代码以及堆栈跟踪。谢谢。
07-28 02:11:18.407 16167-17029/com.donateblood.blooddonation E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
Process: com.donateblood.blooddonation, PID: 16167
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:864)
Caused by: java.lang.NullPointerException
at okhttp3.HttpUrl.canonicalize(HttpUrl.java:1853)
at okhttp3.FormBody$Builder.add(FormBody.java:110)
at com.donateblood.blooddonation.UploadImage$AddUserAsync.doInBackground(UploadImage.java:203)
at com.donateblood.blooddonation.UploadImage$AddUserAsync.doInBackground(UploadImage.java:173)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:864)
public class UploadImage extends AppCompatActivity {
@InjectView(R.id.imageView) ImageView ImageUpload;
@InjectView(R.id.upload) Button Btn_Upload;
@InjectView(R.id.proceed) Button Btn_Proceed;
EditText code;
public ProgressDialog pDialog;
public String bloodgroup,name,password,number,email,age,ID;
public String encodedPhotoString=null;
GPSTracker gps; public Bitmap myimage=null;
public JSONObject json =null;
public double latitude;
public double longitude;
@Override
public void onBackPressed() {
super.onBackPressed();
finish();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
try{
setContentView(R.layout.uploadimage);
ButterKnife.inject(this);
}catch (OutOfMemoryError e){
Toast.makeText(getBaseContext(), "Sorry,Something went wrong", Toast.LENGTH_SHORT).show();
}
code = (EditText) findViewById(R.id.code);
myimage = CroppingActivity.finalImage;
CheckImage();
// Upload image ====================================
Btn_Upload.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(getApplicationContext(), CroppingActivity.class);
startActivity(intent);
UploadImage.this.finish();
}
});
Btn_Proceed.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(code.length()==0){
Toast.makeText(getBaseContext(), "Enter verification code", Toast.LENGTH_LONG).show();
}
else {
Prcoess();
}
}
});
}
public void CheckImage(){
if(myimage!=null){
Uri uri = getImageUri(myimage);
String url = getRealPathFromURI(uri);
File file = new File(url);
Glide.with(UploadImage.this).load(file).asBitmap().diskCacheStrategy( DiskCacheStrategy.NONE ).skipMemoryCache( true ).override(300,300)
.transform(new CenterCrop(UploadImage.this),new CustomCenterCrop(UploadImage.this)).into(ImageUpload);
}else {
encodedPhotoString= null;
}
}
@Override
public void onDestroy() {
super.onDestroy();
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
public String getRealPathFromURI(Uri contentUri) {
Cursor cursor = null;
try {
String[] proj = { MediaStore.Images.Media.DATA };
cursor = UploadImage.this.getContentResolver().query(contentUri, proj, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
} finally {
if (cursor != null) {
cursor.close();
}
}
}
public Uri getImageUri( Bitmap inImage) {
String path = MediaStore.Images.Media.insertImage(UploadImage.this.getContentResolver(), inImage, "Title", null);
return Uri.parse(path);
}
// Processing and adding user to database from here ====================================
public void Prcoess(){
String userentered=code.getText().toString();
String sentcode = SignupActivity.Code;
setPhoto();
if(userentered.equals(sentcode) && encodedPhotoString!=null ){
new AddUserAsync().execute();
}
else {
Toast.makeText(getBaseContext(), "Oopps...Sorry...Upload Again", Toast.LENGTH_LONG).show();
}
}
public void setPhoto() {
// resize the image to store to database
myimage= getResizedBitmap(myimage,400,400);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
myimage.compress(Bitmap.CompressFormat.JPEG, 100, stream);
byte[] byte_arr = stream.toByteArray();
encodedPhotoString = Base64.encodeToString(byte_arr, 0);
Log.e("photo string ", encodedPhotoString);
}
public class AddUserAsync extends AsyncTask<Void,Void,Void> {
JSONObject json = null;
String fromServer = "";
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(UploadImage.this);
pDialog.setMessage("Creating Account...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(Void... voids) {
GetUserDetails();
GenerateGCMID();
email= email.trim().toLowerCase();
//HashMap<String ,String> userDetails = new HashMap<>();
latitude = GPSTracker.getLatitude();
longitude = GPSTracker.getLongitude();
OkHttpClient client = new OkHttpClient.Builder()
.connectTimeout(50, TimeUnit.SECONDS)
.writeTimeout(50, TimeUnit.SECONDS)
.readTimeout(50, TimeUnit.SECONDS)
.build();
FormBody.Builder formBuilder = new FormBody.Builder() // Null pointer exception is thrown here
.add("ID",ID)
.add("Name",name)
.add("email",email)
.add("password",password)
.add("age",age)
.add("number",number)
.add("bloodgroup",bloodgroup)
.add("lat",latitude+"")
.add("longi",longitude+"")
.add("image",encodedPhotoString);
RequestBody formBody = formBuilder.build();
Request request = new Request.Builder()
.url("http://faceblood.website/blood_app/Adduser.php")
.post(formBody)
.build();
try {
Response response = client.newCall(request).execute();
String res = response.body().string();
json = new JSONObject(res);
fromServer = json.getString("added");
Log.e("stringtest",json.getString("added"));
// Do something with the response.
} catch (IOException e) {
Log.e("stringtest IO",e.toString());
e.printStackTrace();
} catch (JSONException e) {
Log.e("stringtest JSON",e.toString());
e.printStackTrace();
}
//json = new HttpCall().postForJSON("http://faceblood.website/blood_app/Adduser.php",userDetails);
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
pDialog.dismiss();
Log.e("fromServer",fromServer);
if(fromServer.equals("addeduser")){
Toast.makeText(getBaseContext(), "Created Successfully", Toast.LENGTH_LONG).show();
onSignupSuccess();
}else {
Toast.makeText(getBaseContext(), "Network problem. Click again", Toast.LENGTH_LONG).show();
}
}
}
public void GenerateGCMID(){
GCMClientManager pushClientManager = new GCMClientManager(this, "921544902369");
pushClientManager.registerIfNeeded(new GCMClientManager.RegistrationCompletedHandler() {
@Override
public void onSuccess(String registrationId, boolean isNewRegistration) {
ID = registrationId;
Log.e("reg",ID);
}
@Override
public void onFailure(String ex) {
super.onFailure(ex);
}
});
}
// Go to another activity on success ====================================
public void onSignupSuccess() {
// stop the service we got the latitude and longitude now
myimage.recycle();
myimage = null;
ImageUpload.setImageResource(0);
stopService(new Intent(this, GPSTracker.class));
Intent intent = new Intent(getApplicationContext(), LoginActivity.class);
startActivity(intent);
finish();
}
// fetch user details ====================================
public void GetUserDetails(){
bloodgroup = SignupActivity.bloodgroup.toString();
name = SignupActivity.name.toString();
email = SignupActivity.email.toString();
password = SignupActivity.password.toString();
number = SignupActivity.number.toString();
age = SignupActivity.age.toString();
}
// Resize the image ====================================
public Bitmap getResizedBitmap(Bitmap bm, int newHeight, int newWidth)
{
int width = bm.getWidth();
int height = bm.getHeight();
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// create a matrix for the manipulation
Matrix matrix = new Matrix();
// resize the bit map
matrix.postScale(scaleWidth, scaleHeight);
// recreate the new Bitmap
Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, false);
return resizedBitmap;
}
}
答案 0 :(得分：3)
<强>提示
在okhttp3.FormBody $ Builder.add（FormBody.java:110）
at ... UploadImage $ AddUserAsync.doInBackground（ UploadImage.java:203 ）
您已在此处的表单中添加了空值（在第203行）
FormBody.Builder formBuilder = new FormBody.Builder()
.add("ID",ID)
.add("Name",name)
.add("email",email)
.add("password",password)
.add("age",age)
.add("number",number)
.add("bloodgroup",bloodgroup)
.add("lat",latitude+"")
.add("longi",longitude+"")
.add("image",encodedPhotoString);
我猜这是从这里开始，你在做另一个异步请求。
public void GenerateGCMID(){
GCMClientManager pushClientManager = new GCMClientManager(this, "921544902369");
pushClientManager.registerIfNeeded(new GCMClientManager.RegistrationCompletedHandler() {
@Override
public void onSuccess(String registrationId, boolean isNewRegistration) {
ID = registrationId;
Log.e("reg",ID);
}
@Override
public void onFailure(String ex) {
super.onFailure(ex);
}
});
}
或者这里因为static值不如何在活动之间传递数据。您无法从当前活动“到达”EditText值到另一个。
// fetch user details ====================================
public void GetUserDetails(){
bloodgroup = SignupActivity.bloodgroup.toString();
name = SignupActivity.name.toString();
email = SignupActivity.email.toString();
password = SignupActivity.password.toString();
number = SignupActivity.number.toString();
age = SignupActivity.age.toString();
}