我在应用程序上显示加载进度栏时遇到问题。我尝试搜索了几天，但仍然没有任何进展。谁能帮助我查看我的代码并给我任何评论。我的问题是，当我打开页面时，它将直接在日食上显示错误并迫使我关闭。错误页面在“调试”选项卡-“ ThreadPoolExecutor.java”中打开
请任何人帮我...
class DownloadMsg extends AsyncTask<Void, String, Void> {
protected void onPreExecute() {
super.onPreExecute();
progressDialog = new ProgressDialog(ViewMsgMain.this);
progressDialog.setMessage("Loading. Please wait...");
progressDialog.setIndeterminate(false);
progressDialog.setCancelable(false);
progressDialog.show();
}
protected Void doInBackground(Void... params) {
try{
//http post
HttpClient httpclient = new DefaultHttpClient();
//===================================================
// Get member id from local database
sp_memberid = getSharedPreferences(memberid, MODE_PRIVATE);
if(sp_memberid.contains("memberid")==true)
{memid = sp_memberid.getInt("memberid", 0);}
Log.e("view message member id == ", "~ "+memid);
//===================================================
HttpPost httppost = new HttpPost("http://localhost/project/viewmessage.php?memberid="+memid);
//httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); //encode a list of NameValuePair objects suitable for HTTP calls
HttpResponse response = httpclient.execute(httppost); // to make an HTTPPOST call with the HttpClient
HttpEntity entity = response.getEntity();
inputstream = entity.getContent();
//Convert response to string
BufferedReader reader = new BufferedReader(new InputStreamReader(inputstream,"UTF-8"));
stringbuilder = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
stringbuilder.append(line + "\n");
}
inputstream.close();
result = stringbuilder.toString();
}
catch(Exception e){
Toast.makeText(getBaseContext(),e.toString() ,Toast.LENGTH_LONG).show();
}
try{
JSONArray jArray = new JSONArray(result);
JSONObject json_data=null;
if(jArray.length() == 0)
{
}
else
{
setContentView(R.layout.viewmsglist);
for(int i=0;i<jArray.length();i++)
{
json_data = jArray.getJSONObject(i);
content_type = content_type + json_data.getString("uploadedcontenttype")+",";
content_path = content_path+"http:/localhost/project/"+(String) json_data.getString("contentpath")+",";
imageAudio_image = imageAudio_image + json_data.getString("imageaudiopath")+",";
//r.add(json_data.getString("member_id") + json_data.getString("member_name") + json_data.getString("member_usernamepath"));
content_id = content_id + json_data.getString("contentid")+",";
imageaudio_id = imageaudio_id + json_data.getString("imageaudioid")+",";
content_date = content_date + json_data.getString("contentdate")+",";
over_contentid = over_contentid + json_data.getString("overallid")+",";
uploaded_content_id = uploaded_content_id + json_data.getString("uploadedcontentid")+",";
sender_id = sender_id + json_data.getString("senderid")+",";
receiver_id = receiver_id + json_data.getString("receiverid")+",";
read_status =read_status + json_data.getString("readstatus")+",";
sender_member_image = sender_member_image + "http://localhost/project/www/"+json_data.getString("memberimage")+",";
}
// Split the data retrieved from database
content_type_split = content_type.split(",");
content_path_split = content_path.split(",");
content_id_split = content_id.split(",");
content_date_split = content_date.split(",");
sender_member_image_split = sender_member_image.split(",");
uploaded_content_id_split = uploaded_content_id.split(",");
imageAudio_image_split = imageAudio_image.split(",");
over_contentid_split = over_contentid.split(",");
mInflater = (LayoutInflater) getSystemService(
Activity.LAYOUT_INFLATER_SERVICE);
data = new Vector<RowData>();
Log.e("content_type_split.length","~ "+content_type_split.length);
for(int i=0;i<content_type_split.length;i++){
try {
rd = new RowData(i,content_type_split[i],content_date_split[i]);
} catch (ParseException e) {
e.printStackTrace();
}
data.add(rd);
}
Log.e("finish here","finish" + data);
//getListView().setTextFilterEnabled(true);*/
Log.e("finish there","t finish");
//new DownloadMsg().execute();
Log.e("retrieved ", "~ "+content_type + "@ " + content_type + " # "+ content_path + " $ "+ sender_id);
/**
* Updating parsed JSON data into ListView
* */
CustomAdapter adapter = new CustomAdapter(ViewMsgMain.this, R.layout.list,R.id.title, data);
setListAdapter(adapter);
getListView().setTextFilterEnabled(true);
}
}
catch(JSONException e1){
Toast.makeText(getApplicationContext(), "Tiada mesej", Toast.LENGTH_SHORT).show();
//Toast.makeText(getBaseContext(),e1.toString() ,Toast.LENGTH_LONG).show();
} catch (ParseException e1) {
Toast.makeText(getBaseContext(),e1.toString() ,Toast.LENGTH_LONG).show();
}
return null;
}
protected void onProgressUpdate(Integer... statusCode) {
switch (statusCode[0]) {
case CANCELED:
removeDialog(PROGRESSDIALOG_ID);
Toast.makeText(getApplicationContext(),
getString(R.string.CanceledMessage),
Toast.LENGTH_SHORT).show();
adapter.notifyDataSetChanged();
break;
case OTHER_INTERNAL_ERROR:
removeDialog(PROGRESSDIALOG_ID);
Toast.makeText(getApplicationContext(),
getString(R.string.internal_exception_message),
Toast.LENGTH_LONG).show();
break;
case SECURITY_ERROR:
removeDialog(PROGRESSDIALOG_ID);
Toast.makeText(getApplicationContext(),
getString(R.string.security_exception_message),
Toast.LENGTH_LONG).show();
break;
case SERVER_STATUS_UPLOADED:
if(!uploadFlag)
uploadFlag = true;
default:
progressDialog.setProgress(uploadCounter);
adapter.notifyDataSetChanged();
}
}
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all tb_cafe
progressDialog.dismiss();
// updating UI from Background Thread
}//end of onPostExecute
更新的问题
public class DisplayDiary extends ListActivity{
// Retrieve member id from local database
String memberid = FypGeneral.LOGINMEMBERID;
SharedPreferences sp_memberid;
int memid;
// Retrieve diary details from database
private String numRows="";
private String diary_id="";
private String diary_image_msgpath="";
private String diary_audio_msgpath="";
private String diary_created_date="";
private String member_id="";
private InputStream inputstream;
private StringBuilder stringbuilder;
private String result="";
// Split the retreived result
private String diary_id_split[];
private String diary_image_msgpath_split[];
private String diary_audio_msgpath_split[];
private String diary_created_date_split[];
private String member_id_split[];
// Custom List View
private LayoutInflater mInflater;
private Bitmap bitmap;
private Vector<RowData> data;
RowData rd;
private ProgressDialog pDialog;
private CustomAdapter adapter;
// Progress Bar
private static final int CANCELED = -4;
private static final int OTHER_INTERNAL_ERROR = -3; //part of internal error
private static final int SECURITY_ERROR = -2; //part of internal error
private static final int SERVER_STATUS_FAILED = -1; //server side failed
private static final int SERVER_STATUS_UPLOADED = 1; //success
private SSLSocketFactory defaultSSLSocketFactory = null;
private HostnameVerifier defaultHostnameVerifier = null;
private int uploadCounter;
private boolean uploadFlag;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//===================================================
// Get member id from local database
sp_memberid = getSharedPreferences(memberid, MODE_PRIVATE);
if(sp_memberid.contains("memberid")==true)
{memid = sp_memberid.getInt("memberid", 0);}
Log.e("view message member id == ", "~ "+memid);
//===================================================
setContentView(R.layout.view_diary_list);
mInflater = (LayoutInflater) getSystemService(
Activity.LAYOUT_INFLATER_SERVICE);
data = new Vector<RowData>();
new LoadDiary().execute();
}
public void onListItemClick(ListView parent, View v, int position,
long id) {
Toast.makeText(getApplicationContext(), "You clicked "+diary_image_msgpath_split[position], Toast.LENGTH_SHORT).show();
}
class LoadDiary extends AsyncTask<Void, Integer, String> {
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(DisplayDiary.this);
pDialog.setMessage("Loading. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected String doInBackground(Void... params) {
try{
Log.e("puvlis", "3");
//http post
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://localhost/project/display_diary.php?memberid="+memid);
//httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); //encode a list of NameValuePair objects suitable for HTTP calls
HttpResponse response = httpclient.execute(httppost); // to make an HTTPPOST call with the HttpClient
HttpEntity entity = response.getEntity();
inputstream = entity.getContent();
}
catch(Exception e){
Toast.makeText(getBaseContext(),e.toString() ,Toast.LENGTH_LONG).show();
}
//Convert response to string
try
{
BufferedReader reader = new BufferedReader(new InputStreamReader(inputstream,"UTF-8"));
stringbuilder = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
stringbuilder.append(line + "\n");
}
inputstream.close();
result = stringbuilder.toString();
}
catch(Exception e)
{
Toast.makeText(getBaseContext(),e.toString() ,Toast.LENGTH_LONG).show();
}
//END Convert response to string
try{
JSONArray jArray = new JSONArray(result);
JSONObject json_data=null;
for(int i=0;i<jArray.length();i++)
{
json_data = jArray.getJSONObject(i);
numRows = json_data.getString("diaryrow");
if(numRows.equals("0"))
{
Toast.makeText(getApplicationContext(), "Tiada diary", Toast.LENGTH_SHORT);
}
else
{
diary_id = diary_id + json_data.getString("diary_id")+",";
diary_image_msgpath = diary_image_msgpath + "http://localhost/project/"+json_data.getString("diary_image_msgpath")+",";
diary_audio_msgpath = diary_audio_msgpath + "http://localhost/project/"+json_data.getString("diary_audio_msgpath")+",";
diary_created_date = diary_created_date + json_data.getString("diary_created_date")+",";
}
//username_path = username_path+"http://omega.fcsit.unimas.my/project/www/"+(String) json_data.getString("member_usernamepath")+",";
//r.add(json_data.getString("member_id") + json_data.getString("member_name") + json_data.getString("member_usernamepath"));
member_id = member_id + json_data.getString("member_id")+",";
}
diary_id_split = diary_id.split(",");
diary_image_msgpath_split = diary_image_msgpath.split(",");
diary_audio_msgpath_split = diary_audio_msgpath.split(",");
diary_created_date_split = diary_created_date.split(",");
data = new Vector<RowData>();
Log.e("content_type_split.length","~ "+diary_image_msgpath_split.length);
for(int i=0;i<diary_image_msgpath_split.length;i++){
try {
rd = new RowData(i,diary_id_split[i],diary_created_date_split[i]);
} catch (ParseException e) {
e.printStackTrace();
}
data.add(rd);
}
Log.e("finish here","finish" + data);
HttpURLConnection conn = null;
DataOutputStream dos = null;
boolean trustEveryone = true;
URL url = null;
try{
switch (conn.getResponseCode()) {
case 200:
publishProgress(SERVER_STATUS_UPLOADED);
break;
case 500:
default:
}
} catch (Exception e) {
e.printStackTrace();
//failed on server side, continue with rest of the items
publishProgress(SERVER_STATUS_FAILED);
}
uploadCounter++;
publishProgress(SERVER_STATUS_UPLOADED);
}
catch(JSONException e1){
Toast.makeText(getBaseContext(),e1.toString() ,Toast.LENGTH_LONG).show();
} catch (ParseException e1) {
Toast.makeText(getBaseContext(),e1.toString() ,Toast.LENGTH_LONG).show();
}
adapter = new CustomAdapter(DisplayDiary.this, R.layout.diary_list,
R.id.title, data);
return null;
}
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all tb_cafe
pDialog.dismiss();
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
setListAdapter(adapter);
getListView().setTextFilterEnabled(true);
}
});
/**
* Updating parsed JSON data into ListView
* */
}
}
private class RowData {
protected int mId;
protected String mTitle;
protected String mDetail;
RowData(int id,String title,String detail){
mId=id;
mTitle = title;
mDetail=detail;
}
@Override
public String toString() {
return mId+" "+mTitle+" "+mDetail;
}
}
/**
*
* @author choonsee
* CustomAdapter
* Description: Adapter created to customize the list layout
* image(type of message)-text(date)-image(message sender)
*
*/
public class CustomAdapter extends ArrayAdapter<RowData> {
public CustomAdapter(Context context, int resource,
int textViewResourceId, List<RowData> objects) {
super(context, resource, textViewResourceId, objects);
}
public View getView(int position, View convertView, ViewGroup parent)
{
ViewHolder holder = null;
TextView title = null;
TextView detail = null;
ImageView i11=null;
ImageView i112=null;
RowData rowData= getItem(position);
if(null == convertView){
convertView = mInflater.inflate(R.layout.diary_list, null);
holder = new ViewHolder(convertView);
convertView.setTag(holder);
}
holder = (ViewHolder) convertView.getTag();
title = holder.gettitle();
title.setText(rowData.mTitle);
detail = holder.getdetail();
detail.setText(rowData.mDetail);
i11=holder.getImage();
i11.setImageResource(R.drawable.imageicon2);
Log.e("urlpath ," , " ~ "+diary_image_msgpath_split[rowData.mId]);
i112=holder.getImage2();
try {
Log.e("enter bitmap ", "yes");
bitmap = BitmapFactory.decodeStream((InputStream)new URL(diary_image_msgpath_split[rowData.mId]).getContent());
i112.setImageBitmap(bitmap);
} catch (MalformedURLException e) {
Toast.makeText(getBaseContext(),e.toString() ,Toast.LENGTH_LONG).show();
//e.printStackTrace();
} catch (IOException e) {
Toast.makeText(getBaseContext(),e.toString() ,Toast.LENGTH_LONG).show();
//e.printStackTrace();
}
return convertView;
}
}
/**
* ViewHolder initial the value and define the variable
* @author choonsee
*
*/
public class ViewHolder {
private View mRow;
private TextView title = null;
private TextView detail = null;
private ImageView i11=null;
private ImageView i112=null;
public ViewHolder(View row) {
mRow = row;
}
public TextView gettitle() {
if(null == title){
title = (TextView) mRow.findViewById(R.id.title);
}
return title;
}
public TextView getdetail() {
if(null == detail){
detail = (TextView) mRow.findViewById(R.id.detail);
}
return detail;
}
public ImageView getImage() {
if(null == i11){
i11 = (ImageView) mRow.findViewById(R.id.img);
}
return i11;
}
public ImageView getImage2() {
if(null == i112){
i112 = (ImageView) mRow.findViewById(R.id.img2);
}
return i112;
}
}
}
最佳答案
对AsyncTask进行了细分，以使doInBackground在后台运行，并且在背景中时，您无法触摸UI。 doInBackground操作应返回结果，该结果将传递给onPostExecute。 onPostExecute在UI线程上运行，在这里您可以更新任何UI元素，包括设置新的列表调整器。
因此，根据您的情况，您可能让doInBackground返回一个包含状态和适配器的自定义对象，所以类似...
public class Reply {
public int status;
public String message;
public Vector<RowData> data;
}
然后在您的AsynReply实现中...
public Reply doInBackground() {
// do your time consuming work
Reply reply = new Reply();
// if error, create reply, and set the error status
// reply.error=CANCELLED
// if no error, you have data, then set data
// reply.data = data
return reply;
}
public void onPostExecute(Reply reply) {
if (reply.data !=null) {
// create CustomAdapter using reply.data and set in listview
} else {
// Make a toast with the reply.message or reply.error
// do any other error clean up that is required on the UI
}
}
顺便说一句，您在
onProgressUpdate中拥有的所有代码都可能已放入onPostExecute中。 onProgressUpdate用于通过长时间操作逐步更新进度。您将从后台线程调用publishProgress，以便最终在UI线程上调用onProgressUpdate。但是由于您的操作是一个阻塞的http请求，因此在此处使用onProgressUpdate可能毫无意义，并且该逻辑应成为onPostExecute的一部分。关于android - Android-使用AsyncTask加载进度，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/10578070/