问题
I am new in android ,and am trying to upload a file to server using ion library ion library but the file crashes. with this error.
FATAL EXCEPTION: Thread-55725
Process: transitions.com.example.huzy_kamz.interview, PID: 4635
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
at android.os.Handler.<init>(Handler.java:209)
at android.os.Handler.<init>(Handler.java:123)
at android.app.Dialog.<init>(Dialog.java:122)
at android.app.AlertDialog.<init>(AlertDialog.java:200)
at android.app.AlertDialog.<init>(AlertDialog.java:196)
at android.app.AlertDialog.<init>(AlertDialog.java:141)
at android.app.ProgressDialog.<init>(ProgressDialog.java:77)
at transitions.com.example.huzy_kamz.interview.MainActivity.uploadFile(MainActivity.java:131)
at transitions.com.example.huzy_kamz.interview.MainActivity$2$1.run(MainActivity.java:66)
at java.lang.Thread.run(Thread.java:818)
This is how am using ion library to upload my file
public class MainActivity extends AppCompatActivity {
private static final int PICK_FILE_REQUEST = 1;
private static final String TAG = MainActivity.class.getSimpleName();
private String selectedFilePath;
private String SERVER_URL = "http://192.168.43.104:8093/PoliceApp/FileUpload.aspx";
ImageView ivAttachment;
private String UPLOAD_URL ="http://192.168.43.104:8093/PoliceApp/ImageUpload.aspx";
ProgressDialog dialog;
private ImageView imageView;
private EditText firstname_edt,lastname_edt,email_edt,jobtitle_edt,source_edt;
private TextView directory_txt;
private Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView= (ImageView)findViewById(R.id.imageView);
firstname_edt=(EditText)findViewById(R.id.firstname_edt);
lastname_edt=(EditText)findViewById(R.id.lastname_edt);
email_edt=(EditText)findViewById(R.id.email_edt);
jobtitle_edt=(EditText)findViewById(R.id.jobtitle_edt);
source_edt=(EditText)findViewById(R.id.source_edt);
button=(Button)findViewById(R.id.button);
directory_txt=(TextView)findViewById(R.id.directory_txt);
imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showFileChooser();
}
});
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(selectedFilePath != null){
dialog = ProgressDialog.show(MainActivity.this,"","Uploading File...",true);
new Thread(new Runnable() {
@Override
public void run() {
//creating new thread to handle Http Operations
uploadFile(selectedFilePath);
// OnSendFileInfo();
}
}).start();
}else{
Toast.makeText(MainActivity.this,"Please choose a File First",Toast.LENGTH_SHORT).show();
}
}
});
}
// Gallery pick
private void showFileChooser() {
Intent intent = new Intent();
//sets the select file to all types of files
intent.setType("*/*");
//allows to select data and return it
intent.setAction(Intent.ACTION_GET_CONTENT);
//starts new activity to select file and return data
startActivityForResult(Intent.createChooser(intent,"Choose File to Upload.."),PICK_FILE_REQUEST);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(resultCode == Activity.RESULT_OK){
if(requestCode == PICK_FILE_REQUEST){
if(data == null){
//no data present
return;
}
Uri selectedFileUri = data.getData();
selectedFilePath = FilePath.getPath(this,selectedFileUri);
Log.i(TAG,"Selected File Path:" + selectedFilePath);
if(selectedFilePath != null && !selectedFilePath.equals("")){
directory_txt.setText(selectedFilePath);
}else{
Toast.makeText(this,"Cannot upload file to server",Toast.LENGTH_SHORT).show();
}
}
}
}
public void uploadFile(final String selectedFilePath){
final ProgressDialog pd;
pd = new ProgressDialog(MainActivity.this);
pd.setMessage("Uploading File...");
pd.setCancelable(false);
pd.show();
final String url_ = "";
Ion.with(MainActivity.this)
.load(SERVER_URL)
.uploadProgressDialog(pd)
.setMultipartParameter("uploaded_file",selectedFilePath)
.setMultipartFile("archive", "application/zip", new File(selectedFilePath))
.asString()
.setCallback(new FutureCallback<String>() {
@Override
public void onCompleted(Exception e, String result) {
Toast.makeText(MainActivity.this," "+result,Toast.LENGTH_LONG).show();
pd.dismiss();
}
});
}
}
My Method Contain ion library to Upload a PDF file .
public void uploadFile(final String selectedFilePath){
final ProgressDialog pd;
pd = new ProgressDialog(MainActivity.this);
pd.setMessage("Uploading ...");
pd.setCancelable(false);
pd.show();
final String url_ = "";
//File file = new File(this.getFilesDir().getAbsolutePath() + "/thesubdirectory/the.zip");
File f = new File(getApplicationContext().getFilesDir().getAbsolutePath()+selectedFilePath);
try {
RandomAccessFile rf = new RandomAccessFile(f, "rw");
rf.setLength(1024 * 1024 * 2);
} catch (Exception e) {
System.err.println(e);
}
File echoedFile = getFileStreamPath("echo");
Ion.with(MainActivity.this)
.load(SERVER_URL)
.uploadProgressDialog(pd)
.setMultipartFile("uploaded_file",f)
.write(echoedFile)
.setCallback(new FutureCallback<File>() {
@Override
public void onCompleted(Exception e, File result) {
try {
Toast.makeText(MainActivity.this, " " + result, Toast.LENGTH_LONG).show();
System.out.println("Error " + result);
pd.dismiss();
} catch (Exception e1) {
System.out.println("Error " + e1);
}
pd.dismiss();
}
});
}
I don't where am wrong please i need your help, where am i wrong. My back end is working fine , but the problem is in the uploading process.
This is my C# Api to locate the File in a specified folder.
public void FileSave(HttpPostedFile file)
{
try
{
if (file.ContentLength > 0)
{
var fileName = Path.GetFileName(file.FileName);
var path = Path.Combine(Server.MapPath("~/FileStorage"), fileName);
file.SaveAs(path);
}
Response.Write("Upload successfull");
}
catch
{
Response.Write("An Error Ocurred");
}
}
回答1:
Well i have found out a simple way of uploading or posting multipart/form-data with an upload progress bar. may be this could help.
Suppose you server is waiting for the following data :
1.File(PDF,Image,Audio,Video etc.).
2.Name
3.Email
4.Address.
and you want to upload that information once in a URL be it an Absolute URL or a Relative URL, ion library is easy , precise, efficient and much better in this.
STEP 1:
declare your URI
private Uri filePath;
STEP 2:
then Pick the file from your gallery , here it's your choice you identify any kind of files you want a user to view, me here i have identified a PDF file.
on this line intent.setType("application/pdf");
private void showFileChooser() {
Intent intent = new Intent();
intent.setType("application/pdf");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Pdf"), PICK_PDF_REQUEST);
}
//handling the image chooser activity result
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICK_PDF_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
filePath = data.getData();
Toast.makeText(getApplicationContext(), "" + filePath, Toast.LENGTH_LONG).show();
}
}
then you can call showFileChooser() in the Button for a click to access your gallery.
STEP 3:
a) Make a method Upload() containing ion library to start the job. If you see in this method , i first declared the file,name, email,address , for file it gets the URI data of a selected file or the path file , then name, email,address, it gets the data from EditText , you have to declare EditText to get the data.
b) Then identify the URL you want to use in Posting mine is url_. but make sure you include POST, in the load section .load("POST",url_).
c) Then you set the file by using .setMultipartFile("File", file) and the rest of the parameters by setting MultipartParameter .setMultipartParameter("Name", name) and so on.
public void Upload() {
String file= FilePath.getPath(this, filePath);
final String name = name_edt.getText().toString();
final String email = email_edt.getText().toString();
final String address = address_edt.getText().toString();
final ProgressDialog pd;
pd = new ProgressDialog(MainActivity.this);
pd.setMessage("Logging in...");
pd.setCancelable(false);
pd.show();
final String url_ = "xxxxxxxxxxxxxxx";
final File file = new File(Uri.parse(path).toString());
Ion.with(MainActivity.this)
.load("POST",url_)
.progressDialog(pd)
.setMultipartFile("file", file)
.setMultipartParameter("Name", name)
.setMultipartParameter("Email", email)
.setMultipartParameter("Address.", address)
.asString()
.setCallback(new FutureCallback<String>() {
@Override
public void onCompleted(Exception e, String result) {
// Toast.makeText(getApplicationContext(),""+file,Toast.LENGTH_LONG).show();
System.out.println("Error " + e);
// Toast.makeText(getApplicationContext(), "Exception : " + e, Toast.LENGTH_LONG).show();
Toast.makeText(getApplicationContext(), result, Toast.LENGTH_LONG).show();
// Toast.makeText(getApplicationContext(),""+e,Toast.LENGTH_LONG).show();
pd.dismiss();
}
});
}
Then you are good to go , according to your C# API , the file will be able to save in the Folder. Even others use Php or any other language you can create your own Api to save a file in your server folder
Hope it works well.
回答2:
Remove Thread from calling chain as Ion manages that for you and your exception is not related to Ion FYI.
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(selectedFilePath != null){
dialog = ProgressDialog.show(MainActivity.this,"","Uploading File...",true);
uploadFile(selectedFilePath);
// OnSendFileInfo();
}else{
Toast.makeText(MainActivity.this,"Please choose a File First",Toast.LENGTH_SHORT).show();
}
}
});
You can not use a View in Non Ui thread . So as i am seeing that you are creating a progress dialog inside your upload method which is being called for a thread .That code should be in Main thread only.
来源：https://stackoverflow.com/questions/43752958/uploading-a-file-multipart-form-data-to-server-failed-in-android-using-ion-lib