我创建了以下代码以连接到.net Web Service API并上传图像。然而，我遇到了一个错误。有人可以解释一下如何解决这个问题吗？
private static int RESULT_LOAD_IMAGE = 1;
Button imageLoad, uploadBtn;
ImageView imageView;
TextView imagePath, message;
String imgPath;
private Bitmap bitmap;
private ProgressDialog dialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageLoad = (Button) findViewById(R.id.buttonLoadPicture);
uploadBtn = (Button) findViewById(R.id.upload);
imageView = (ImageView) findViewById(R.id.imgView);
imagePath = (TextView) findViewById(R.id.imagePath);
message = (TextView) findViewById(R.id.message);
imageLoad.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, RESULT_LOAD_IMAGE);
}
});
uploadBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog = ProgressDialog.show(MainActivity.this, "", "Uploading
file...", true);
new uploadFile().execute();
}
});
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
Uri selectedImage = data.getData();
Log.d("Selected image URI", selectedImage.toString());
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Log.d("Image Path Column", filePathColumn.toString());
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
Log.d("Picture Path", picturePath);
imagePath.setText(picturePath);
imgPath = picturePath;
ImageView imageView = (ImageView) findViewById(R.id.imgView);
imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));
}
}
class uploadFile extends AsyncTask<Void, Void, String> {
@Override
protected String doInBackground(Void... params) {
Bitmap bm = BitmapFactory.decodeFile(imgPath);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
byte[] b = baos.toByteArray();
Log.d("b", b.toString());
Log.d("baos", baos.toString());
SoapObject request = new SoapObject("http://tempuri.org/", "sendImage");
request.addProperty("myImage", b);
SoapSerializationEnvelope envelope=new
SoapSerializationEnvelope(SoapEnvelope.VER11);
new MarshalBase64().register(envelope);
envelope.dotNet = true;
envelope.setOutputSoapObject(request);
try {
Toast.makeText(getApplicationContext(), "Sending Pic",
Toast.LENGTH_LONG).show();
Toast.makeText(getApplicationContext(), "array length=" + b.length,
Toast.LENGTH_LONG).show();
HttpTransportSE androidHttpTransport = new
HttpTransportSE("http://www.letstrend.com/spursService.asmx?WSDL");
androidHttpTransport.call("http://tempuri.org/sendImage", envelope);
SoapObject result = (SoapObject)envelope.bodyIn;
Log.d("Soap Response", result.toString());
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(), "in catch e=" + e.getMessage(),
Toast.LENGTH_LONG).show();
Toast.makeText(getApplicationContext(), "fault=" + ((SoapFault)
envelope.bodyIn).faultstring, Toast.LENGTH_LONG).show();
}
return null;
}
}
LogCat中显示的错误是
FATAL EXCEPTION: AsyncTask #1 java.lang.RuntimeException: An error occured while executing doInBackground() at android.os.AsyncTask$3.done(AsyncTask.java:299) at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352) at java.util.concurrent.FutureTask.setException(FutureTask.java:219) at java.util.concurrent.FutureTask.run(FutureTask.java:239) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573) at java.lang.Thread.run(Thread.java:856) Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() at android.os.Handler.<init>(Handler.java:197) at android.os.Handler.<init>(Handler.java:111) at android.widget.Toast$TN.<init>(Toast.java:324) at android.widget.Toast.<init>(Toast.java:91) at android.widget.Toast.makeText(Toast.java:238) atcom.maan.fileuploadbinary.MainActivity$uploadFile.doInBackground(MainActivity.java:150) atcom.maan.fileuploadbinary.MainActivity$uploadFile.doInBackground(MainActivity.java:1) at android.os.AsyncTask$2.call(AsyncTask.java:287) at java.util.concurrent.FutureTask.run(FutureTask.java:234) ... 4 more
和
Activity com.maan.fileuploadbinary.MainActivity has leaked windowcom.android.internal.policy.impl.PhoneWindow$DecorView{40cd31e8 V.E..... R.....ID 0,0- 456,144} that was originally android.view.WindowLeaked:
Activity com.maan.fileuploadbinary.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40cd31e8 V.E..... R.....ID 0,0-456,144} that was originally added here
at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
at android.app.Dialog.show(Dialog.java:281)
at android.app.ProgressDialog.show(ProgressDialog.java:116)
at android.app.ProgressDialog.show(ProgressDialog.java:99)
at com.maan.fileuploadbinary.MainActivity$2.onClick(MainActivity.java:71)
at android.view.View.performClick(View.java:4204)
at android.view.View$PerformClick.run(View.java:17355)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
有人可以告诉我哪里出错了，这样我就可以学习并纠正错误。
提前感谢。
答案 0 :(得分：1)
不要从AsyncTask访问您的UI-Thread，您的Toast会尝试访问它。因此，请在onPostExecute中制作所有UI-Thread动作并覆盖此方法，例如。带有Bitmap的Object和带错误的字符串。
//DEFINE TO RETURN A SOAP OBJECT
class uploadFile extends AsyncTask<Void, Void, SoapObject> {
//DEFINE TO RETURN A SOAP OBJECT
@Override
protected SoapObject doInBackground(Void... params) {
Bitmap bm = BitmapFactory.decodeFile(imgPath);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
byte[] b = baos.toByteArray();
Log.d("b", b.toString());
Log.d("baos", baos.toString());
SoapObject request = new SoapObject("http://tempuri.org/", "sendImage");
request.addProperty("myImage", b);
SoapSerializationEnvelope envelope=new
SoapSerializationEnvelope(SoapEnvelope.VER11);
new MarshalBase64().register(envelope);
envelope.dotNet = true;
envelope.setOutputSoapObject(request);
try {
// ---> THIS IS BAD!!!!
Toast.makeText(getApplicationContext(), "Sending Pic",
Toast.LENGTH_LONG).show();
Toast.makeText(getApplicationContext(), "array length=" + b.length,
Toast.LENGTH_LONG).show();
//<------- DELETE IT
HttpTransportSE androidHttpTransport = new
HttpTransportSE("http://www.letstrend.com/spursService.asmx?WSDL");
androidHttpTransport.call("http://tempuri.org/sendImage", envelope);
SoapObject result = (SoapObject)envelope.bodyIn;
Log.d("Soap Response", result.toString());
} catch (Exception e) {
e.printStackTrace();
// ---> THIS IS BAD!!!!
Toast.makeText(getApplicationContext(), "in catch e=" + e.getMessage(),
Toast.LENGTH_LONG).show();
Toast.makeText(getApplicationContext(), "fault=" + ((SoapFault)
envelope.bodyIn).faultstring, Toast.LENGTH_LONG).show();
//<------- DELETE IT
}
//TRY TO RETURN A MORE PROPRIATE OBJECT LIKE YOUR RESULT! AND HANDLE IT IN onPostExecute
return result ;
}
@Override
onPostExecute(SoapObject result){
if(result == null){
Toast.makeText(_context, "Something went wrong", Toast.LENGTH_SHORT).show();
return;
}
//HANDLE YOUR RESULT HERE
}