0
我是android新手。我試圖在aysnc Task中顯示一個進度條，同時發送照片到服務器，我希望製作與文件一樣多的進度條，並且這些進度條將根據發送到服務器的字節百分比更改狀態。我做了搜索，發現了一些與此相關的問題，但無法修改我的代碼，問題是進度條在按下按鈕後沒有顯示。Android-在將圖像發送到服務器時顯示ProgressBar中的異步任務
這裏是我的代碼
public class HttpUploader extends AsyncTask<String, Void, String> {
/*----------------------
i followed some questions and here i have tried something but caused me an error
private ProgressDialog dialog;
private Context context;
@Override
protected void onPreExecute() {
dialog = new ProgressDialog(context);
dialog.setMessage("Uploading...");
dialog.setIndeterminate(false);
dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
dialog.setProgress(0);
dialog.show();
}
protected void onPostExecute(final Boolean success) {
if (dialog.isShowing()) {
dialog.dismiss();
}
}-------------------------*/
protected String doInBackground(String... path) {
String outPut = null;
for (String sdPath:path) {
Bitmap bitmapOrg = BitmapFactory.decodeFile(sdPath);
ByteArrayOutputStream bao = new ByteArrayOutputStream();
//Resize the image
double width = bitmapOrg.getWidth();
double height = bitmapOrg.getHeight();
double ratio = 400/width;
int newheight = (int)(ratio*height);
// System.out.println("———-width" + width);
//System.out.println("———-height" + height);
bitmapOrg = Bitmap.createScaledBitmap(bitmapOrg, 400, newheight, true);
//Here you can define .PNG as well
bitmapOrg.compress(Bitmap.CompressFormat.JPEG, 95, bao);
byte[] ba = bao.toByteArray();
String ba1 = Base64.encodeToString(ba, 0);
//System.out.println("uploading image now ——–" + ba1);
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("image", ba1));
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://imageuplaod");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
// print responce
outPut = EntityUtils.toString(entity);
Log.i("GET RESPONSE—-", outPut);
//is = entity.getContent();
Log.e("log_tag ******", "good connection");
bitmapOrg.recycle();
} catch (Exception e) {
Log.e("log_tag ******", "Error in http connection " + e.toString());
}
}
return outPut;
}
}
我MainActivity類
public class MainActivity extends Activity{
Uri currImageURI;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button upload_btn = (Button) this.findViewById(R.id.uploadButton);
upload_btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
upload();
}});
}
public void upload(){
ArrayList<Uri> fileName = getFileList();
for (int i = 0 ; i < fileName.size() ; i++)
{
HttpUploader uploader = new HttpUploader();
try {
uploader.execute(getRealPathFromURI(fileName.get(i))).get();
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
}
TextView tv_path = (TextView) findViewById(R.id.path);
tv_path.setText(getRealPathFromURI(currImageURI));
}
public String getRealPathFromURI(Uri contentUri) {
String [] proj={MediaStore.Images.Media.DATA};
android.database.Cursor cursor = managedQuery(contentUri,
proj, // Which columns to return
null, // WHERE clause; which rows to return (all rows)
null, // WHERE clause selection arguments (none)
null); // Order-by clause (ascending by name)
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
private ArrayList<Uri> getFileList()
{
ArrayList<Uri> fileList = new ArrayList<Uri>();
try
{
String[] proj = { MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID };
Cursor actualimagecursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, proj,
null, null, MediaStore.Images.Media.DEFAULT_SORT_ORDER);
int actual_image_column_index = actualimagecursor.getColumnIndexOrThrow(MediaStore.Images.Media._ID);
for (int i = 0 ; i < actualimagecursor.getCount() ; i++)
{
actualimagecursor.moveToPosition(i);
String fileName = actualimagecursor.getString(actual_image_column_index);
fileList.add((Uri.withAppendedPath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, fileName)));
//fileName = (Uri.withAppendedPath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, fileName).toString());
}
return fileList;
}
catch (Exception e)
{
return null;
}
}
}
這是什麼問題？什麼不起作用？ – Merlevede
那麼你最近的問題呢？請清除您的問題 –
我想顯示進度條..我已更新我的問題。 – hellosheikh