我有一个应用程序，我需要拍摄相机图像并相应上传。以下是我的代码。我在手机上尝试上传时出现问题，因为我使用异步任务而无法查看确切的问题。所以我在我的模拟器上测试我可以获得图像，但是当来到这一行Toast.makeText（getApplicationContext（），＆＃34;文件路径是：＆＃34; + selectedImage，Toast.LENGTH_LONG）.show（）;它为模拟器上的路径打印null，但在手机上它打印确切的路径。如何克服这个问题，以便我可以说明为什么它无法上传。
public class Capture extends Activity implements OnClickListener {
private static final int CAMERA_REQUEST = 1888;
private ImageView imageView;
private Button scanBtn1,scanBtn2,submitBtn;
private TextView vhlTxt,sstTxt;
private int btnClicked = 0;
private String selectedImagePath = "";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.capture);
this.imageView = (ImageView)this.findViewById(R.id.imageView1);
Button photoButton = (Button) this.findViewById(R.id.button1);
photoButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_REQUEST);
}
});
scanBtn1 = (Button)findViewById(R.id.button2);
scanBtn2 = (Button)findViewById(R.id.button3);
scanBtn2 = (Button)findViewById(R.id.btnSubmit);
vhlTxt = (TextView)findViewById(R.id.editText1);
sstTxt = (TextView)findViewById(R.id.editText2);
scanBtn1.setOnClickListener(this);
scanBtn2.setOnClickListener(this);
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
//Toast.makeText(getApplicationContext(), "on activiet result",Toast.LENGTH_LONG).show();
if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) {
Bitmap photo = (Bitmap) data.getExtras().get("data");
imageView.setImageBitmap(photo);
Uri selectedImage = data.getData();
//String[] filePathColumn = {MediaStore.Images.Media.DATA};
Toast.makeText(getApplicationContext(), "File Path is :"+selectedImage,Toast.LENGTH_LONG).show();
try {
selectedImagePath = getPath(selectedImage);
Toast.makeText(getApplicationContext(), "get path :"+selectedImagePath,Toast.LENGTH_LONG).show();
File sourceFile = new File(selectedImagePath.toString());
if(sourceFile.isFile())
{
Toast.makeText(getApplicationContext(), "build stream :"+selectedImage.toString(),Toast.LENGTH_LONG).show();
FileInputStream fileInputStream = new FileInputStream(sourceFile);
int bytesAvailable = fileInputStream.available();
Toast.makeText(getApplicationContext(), "size of file is :"+bytesAvailable,Toast.LENGTH_LONG).show();
}
else
Toast.makeText(getApplicationContext(), "no source file",Toast.LENGTH_LONG).show();
}
catch (Exception e) {
}
}
else{
IntentResult scanningResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
if (scanningResult != null) {
String scanContent = scanningResult.getContents();
Toast toast = Toast.makeText(getApplicationContext(),
"Data received!"+scanContent, Toast.LENGTH_LONG);
toast.show();
if(btnClicked==2)
vhlTxt.setText(scanContent);
else if(btnClicked==3)
sstTxt.setText(scanContent);
}
else{
Toast toast = Toast.makeText(getApplicationContext(),
"No scan data received!", Toast.LENGTH_LONG);
toast.show();
}
}
}
public void onClick(View v){
//respond to clicks
//Toast.makeText(getApplicationContext(), "Done with it",Toast.LENGTH_LONG).show();
if(v.getId()==R.id.button2){
btnClicked=2;
//Toast.makeText(getApplicationContext(), "Done with it",Toast.LENGTH_LONG).show();
IntentIntegrator scanIntegrator = new IntentIntegrator(this);
scanIntegrator.initiateScan();
}
else if(v.getId()==R.id.button3){
btnClicked=3;
//Toast.makeText(getApplicationContext(), "Done with it",Toast.LENGTH_LONG).show();
IntentIntegrator scanIntegrator = new IntentIntegrator(this);
scanIntegrator.initiateScan();
}
else if(v.getId()==R.id.btnSubmit){
ProgressDialog progressDialog = new ProgressDialog(Capture.this);
progressDialog.setMessage("Uploading......");
progressDialog.setCancelable(false);
uploadTask ut = new uploadTask(Sealing.this, progressDialog);
ut.execute(selectedImagePath,vhlTxt.getText().toString(),sstTxt.getText().toString());
}
}
private String getPath(Uri uri) {
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(uri, projection, null, null,null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
public void showUploadError(String result)
{
Toast.makeText(getApplicationContext(), "upload error :"+result.toString(),Toast.LENGTH_LONG).show();
}
public void showUploadOk(String result)
{
Toast.makeText(getApplicationContext(), "upload ok :"+result.toString(),Toast.LENGTH_LONG).show();
}
}
这是我按下提交按钮时调用的上传任务功能。我已经确认我的upload1.php工作正常，因为我已经使用了我的另一个php文件来测试此页面上传并且它有效。任何改进的提示或问题可能在哪里？
public class uploadTask extends AsyncTask<String, Void, Integer> {
private ProgressDialog progressDialog;
private Capture activity;
private int id = -1;
private String resultUpload = "";
public uploadTask(Capture activity, ProgressDialog progressDialog)
{
this.activity = activity;
this.progressDialog = progressDialog;
}
@Override
protected void onPreExecute()
{
progressDialog.show();
}
@Override
protected Integer doInBackground(String... arg0)
{
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
String Tag="fSnd";
String result = "";
int responseCode = 0;
try
{
Log.e(Tag,"Starting Http File Sending to URL");
URL connectURL = new URL("http://*****/upload1.php");
File sourceFile = new File(arg0[0]);
String iFileName = sourceFile.getName();
if(sourceFile.isFile())
{
//Toast.makeText(getApplicationContext(), "build stream :"+selectedImage.toString(),Toast.LENGTH_LONG).show();
FileInputStream fileInputStream = new FileInputStream(sourceFile);
//Toast.makeText(getApplicationContext(), "size of file is :"+bytesAvailable,Toast.LENGTH_LONG).show();
// Open a HTTP connection to the URL
HttpURLConnection conn = (HttpURLConnection)connectURL.openConnection();
// Allow Inputs
conn.setDoInput(true);
// Allow Outputs
conn.setDoOutput(true);
// Don't use a cached copy.
conn.setUseCaches(false);
// Use a post method.
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Content-Type", "multipart/form-data;boundary="+boundary);
DataOutputStream dos = new DataOutputStream(conn.getOutputStream());
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"vhlID\""+ lineEnd);
dos.writeBytes(lineEnd);
dos.writeBytes(arg0[1]);
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"sstID\""+ lineEnd);
dos.writeBytes(lineEnd);
dos.writeBytes(arg0[2]);
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"uploadedFile\";filename=\"" + iFileName +"\"" + lineEnd);
dos.writeBytes(lineEnd);
Log.e(Tag,"Headers are written");
// create a buffer of maximum size
int bytesAvailable = fileInputStream.available();
int maxBufferSize = 1024;
int bufferSize = Math.min(bytesAvailable, maxBufferSize);
byte[ ] buffer = new byte[bufferSize];
// read file and write it into form...
int bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0)
{
dos.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable,maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0,bufferSize);
}
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
// close streams
fileInputStream.close();
dos.flush();
Log.e(Tag,"File Sent, Response: "+String.valueOf(conn.getResponseCode()));
InputStream is = conn.getInputStream();
// retrieve the response from server
int ch;
StringBuffer b =new StringBuffer();
while( ( ch = is.read() ) != -1 ){ b.append( (char)ch ); }
resultUpload=b.toString();
// Log.i("Response",s);
dos.close();
}
}
catch (Exception e) {
responseCode = 408;
e.printStackTrace();
}
return responseCode;
}
@Override
protected void onPostExecute(Integer headerCode)
{
progressDialog.dismiss();
if(headerCode == 200){
activity.showUploadOk(resultUpload);
}
else{
activity.showUploadError(resultUpload);
}
}
}
答案 0 :(得分：0)
要尝试的几件事
确保在创建Emualator AVD映像时为SD卡分配了存储空间。
尝试自己创建一个文件，并传入the uri to via MediaStore.EXTRA_OUTPUT。请参阅this SO question for有关如何执行此操作的详细信息