如何设置进度条

Question

public class circularlistparsing extends ActivityGroup {

public int currentPage = 1;
public ListView lisView1;
static final String KEY_ITEM = "docdetails";
static final String KEY_ITEM2 = "info";
static final String KEY_NAME1 = "";
static final String KEY_NAME = "heading";
static final String KEY_DATE = "date";
public Button btnNext;
public Button btnPre;
public static String url = "http://dev.taxmann.com/TaxmannService/TaxmannService.asmx/GetCircularList";
TextView txtreord;
TextView totalpage;
TextView pagenumber;
ProgressDialog dialog;
TextView title;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    txtreord = (TextView) findViewById(R.id.recored);
    totalpage = (TextView) findViewById(R.id.totalpage);
    pagenumber = (TextView) findViewById(R.id.pagenumber);
    title = (TextView) findViewById(R.id.title);

    title.setText("Cirrcular");
    // listView1
    lisView1 = (ListView) findViewById(R.id.listView1);

    // Next
    btnNext = (Button) findViewById(R.id.btnNext);
    // Perform action on click
    btnNext.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            currentPage = currentPage + 1;

            // new YourTask().execute();
            ShowData();
            pagenumber.setText("Of" + currentPage + "]");
        }
    });

    // Previous
    btnPre = (Button) findViewById(R.id.btnPre);
    // Perform action on click
    btnPre.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            currentPage = currentPage - 1;

            // new YourTask().execute();
            ShowData();
            pagenumber.setText("Of" + currentPage + "]");
        }
    });


    ShowData();
 }

public void ShowData() {
    XMLParser parser = new XMLParser();
    String xml = parser.getXmlFromUrl(url); // getting XML

    Document doc = parser.getDomElement(xml); // getting DOM element

    NodeList nl = doc.getElementsByTagName(KEY_ITEM);

    NodeList n2 = doc.getElementsByTagName(KEY_ITEM2);

    int displayPerPage = 10; // Per Page
    int TotalRows = nl.getLength();

    txtreord.setText(TotalRows + "Records|"); // number of records

    int indexRowStart = ((displayPerPage * currentPage) - displayPerPage);
    int TotalPage = 0;
    if (TotalRows <= displayPerPage) {
        TotalPage = 1;
    } else if ((TotalRows % displayPerPage) == 0) {
        TotalPage = (TotalRows / displayPerPage);
    } else {
        TotalPage = (TotalRows / displayPerPage) + 1; // 7
        TotalPage = (int) TotalPage; // 7
    }

    totalpage.setText("Page[" + TotalPage);

    int indexRowEnd = displayPerPage * currentPage; // 5
    if (indexRowEnd > TotalRows) {
        indexRowEnd = TotalRows;
    }

    // Disabled Button Next
    if (currentPage >= TotalPage) {
        btnNext.setEnabled(false);
    } else {
        btnNext.setEnabled(true);
    }

    // Disabled Button Previos
    if (currentPage <= 1) {
        btnPre.setEnabled(false);
    } else {
        btnPre.setEnabled(true);
    }

    // Load Data from Index
    int RowID = 1;
    ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>();
    HashMap<String, String> map;

    // RowID
    if (currentPage > 1) {
        RowID = (displayPerPage * (currentPage - 1)) + 1;
    }

    for (int i = indexRowStart; i < indexRowEnd; i++) {
        Element e = (Element) nl.item(i);

        Element e2 = (Element) n2.item(i);

        String date = e2.getAttribute(KEY_DATE);
        // adding each child node to HashMap key => value

        map = new HashMap<String, String>();
        map.put("RowID", String.valueOf(RowID));

        map.put(KEY_DATE, date);



        String mytime = date;
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmdd");
        Date myDate = null;
        try {
            myDate = dateFormat.parse(mytime);

        } catch (ParseException t) {
            t.printStackTrace();
        } catch (java.text.ParseException t) {
            // TODO Auto-generated catch block
            t.printStackTrace();
        }

        SimpleDateFormat timeFormat = new SimpleDateFormat("yyyy-MM-dd");
        String finalDate = timeFormat.format(myDate);

        // System.out.println("rrrrrrrrrrrrr"+finalDate);

        String Heading = parser.getValue(e, KEY_NAME);

        int a = Heading.indexOf("|");
        String beforeSubString = Heading.substring(0, a);
        String afterSubString = Heading.substring(a, Heading.length())
                .replace("|", "") + "[" + finalDate + "]";
        // String
        // final1="<b>"+beforeSubString+"<b>"+"|"+afterSubString.replace("|",
        // "|\n")
        // .replace("|", "");
        // String k=Html.fromHtml(final1).toString();
        //
        // Html.fromHtml(final1);

        map.put(KEY_NAME, beforeSubString);
        map.put(KEY_NAME1, afterSubString);

        // adding HashList to ArrayList
        menuItems.add(map);

        RowID = RowID + 1;

    }

    SimpleAdapter sAdap;
    sAdap = new SimpleAdapter(circularlistparsing.this, menuItems,
            R.layout.list_item,
            new String[] { "RowID", KEY_NAME1, KEY_NAME }, new int[] {
                    R.id.ColRowID, R.id.ColName, R.id.textView1 });
    lisView1.setAdapter(sAdap);

    lisView1.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                long arg3) {
            // TODO Auto-generated method stub

            Intent i = new Intent(circularlistparsing.this, detail.class);
            // sending data to new activity
            // i.putExtra("product", product);
            startActivity(i);

        }
    });

}
}

这是我的源代码此Activity公共类circularlistparsing扩展了ActivityGroup 这是我的活动这个Actvity正在加载onButton点击另一个类我要设置进度条加载数据请告诉我如何实现这个我做了很多但是不能显示进度条我已经使用asynk任务然后也无法显示。

Answer 1

使用此代码更改您的代码。

public int currentPage = 1;
public ListView lisView1;
static final String KEY_ITEM = "docdetails";
static final String KEY_NAME = "heading";
public Button btnNext;
public Button btnPre;
int TotalPage = 0;
int ERROR_CODE;
ArrayList<HashMap<String, String>> menuItems;
public static String url = "paste your URL";

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    // listView1
    lisView1 = (ListView) findViewById(R.id.listView1);

    // Next
    btnNext = (Button) findViewById(R.id.btnNext);

    // Previous
    btnPre = (Button) findViewById(R.id.btnPre);
    // Perform action on click
    btnNext.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            currentPage = currentPage + 1;
            new Data().execute();
        }
    });

    // Perform action on click
    btnPre.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            currentPage = currentPage - 1;
            new Data().execute();
        }
    });

    new Data().execute();
}

private class Data extends AsyncTask<Object, Integer, Object> {
    private ProgressDialog progress;

    @Override
    protected void onPreExecute() {

        progress = ProgressDialog.show(AndroidXMLParsingActivity.this, "",
                "Loading...");

        super.onPreExecute();
    }

    @Override
    protected Object doInBackground(Object... params) {
        // do hard work here
        ShowData();
        return null;
    }

    @Override
    protected void onPostExecute(Object result) {

        progress.dismiss();
        if (ERROR_CODE == 1) {
            Toast.makeText(AndroidXMLParsingActivity.this, "No Xml found.",
                    Toast.LENGTH_SHORT).show();
        } else if (ERROR_CODE == 2) {
            Toast.makeText(AndroidXMLParsingActivity.this, "No doc found.",
                    Toast.LENGTH_SHORT).show();
        } else {
            // Disabled Button Next
            if (currentPage >= TotalPage) {
                btnNext.setEnabled(false);
            } else {
                btnNext.setEnabled(true);
            }

            // Disabled Button Previos
            if (currentPage <= 1) {
                btnPre.setEnabled(false);
            } else {
                btnPre.setEnabled(true);
            }

            SimpleAdapter sAdap;
            sAdap = new SimpleAdapter(AndroidXMLParsingActivity.this,
                    menuItems, R.layout.list_item, new String[] { "RowID",
                            KEY_NAME }, new int[] { R.id.ColRowID,
                            R.id.ColName });
            lisView1.setAdapter(sAdap);
        }
    }
}

public void ShowData() {
    XMLParser parser = new XMLParser();
    String xml = parser.getXmlFromUrl(url); // getting XML
    if (xml != null) {
        Document doc = parser.getDomElement(xml); // getting DOM element
        if (doc != null) {
            NodeList nl = doc.getElementsByTagName(KEY_ITEM);

            int displayPerPage = 5; // Per Page
            int TotalRows = nl.getLength();
            int indexRowStart = ((displayPerPage * currentPage) - displayPerPage);

            if (TotalRows <= displayPerPage) {
                TotalPage = 1;
            } else if ((TotalRows % displayPerPage) == 0) {
                TotalPage = (TotalRows / displayPerPage);
            } else {
                TotalPage = (TotalRows / displayPerPage) + 1; // 7
                TotalPage = (int) TotalPage; // 7
            }
            int indexRowEnd = displayPerPage * currentPage; // 5
            if (indexRowEnd > TotalRows) {
                indexRowEnd = TotalRows;
            }

            // Load Data from Index
            int RowID = 1;
            menuItems = new ArrayList<HashMap<String, String>>();
            HashMap<String, String> map;

            // RowID
            if (currentPage > 1) {
                RowID = (displayPerPage * (currentPage - 1)) + 1;
            }

            for (int i = indexRowStart; i < indexRowEnd; i++) {
                Element e = (Element) nl.item(i);
                // adding each child node to HashMap key => value
                map = new HashMap<String, String>();
                map.put("RowID", String.valueOf(RowID));
                map.put(KEY_NAME, parser.getValue(e, KEY_NAME));

                // adding HashList to ArrayList
                menuItems.add(map);

                RowID = RowID + 1;
            }
        }
        ERROR_CODE = 2;
    }
    ERROR_CODE = 1;
}

Answer 2

试试这段代码，

/** Called when the activity is first created. */
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);      

    RelativeLayout fv = new RelativeLayout(this);
    ProgressBar pb = new ProgressBar(this);
    fv.setGravity(Gravity.CENTER);
    fv.addView(pb);
    setContentView(fv); 
}

这对我很好..

Answer 3

@Override
 public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
txtreord = (TextView) findViewById(R.id.recored);
totalpage = (TextView) findViewById(R.id.totalpage);
pagenumber = (TextView) findViewById(R.id.pagenumber);
title = (TextView) findViewById(R.id.title);

title.setText("Cirrcular");
// listView1
lisView1 = (ListView) findViewById(R.id.listView1);

// Next
btnNext = (Button) findViewById(R.id.btnNext);
// Perform action on click
btnNext.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        currentPage = currentPage + 1;

        // new YourTask().execute();
        ShowData();
        pagenumber.setText("Of" + currentPage + "]");
    }
});

// Previous
btnPre = (Button) findViewById(R.id.btnPre);
// Perform action on click
btnPre.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        currentPage = currentPage - 1;

        // new YourTask().execute();
        ShowData();
        pagenumber.setText("Of" + currentPage + "]");
      }
   });

   new NflAsyncTask().execute();

   }
}       
public class NflAsyncTask extends AsyncTask<Void, Void, Void> {

private ProgressDialog progressDialog;

protected void onPreExecute() {
    progressDialog = ProgressDialog.show(Activityname.this,
            "Please wait", "Loading Data ...", true);
}

@Override
protected Void doInBackground(Void... params) {
     XMLParser parser = new XMLParser();
        String xml = parser.getXmlFromUrl(url); // getting XML

        Document doc = parser.getDomElement(xml); // getting DOM element

        NodeList nl = doc.getElementsByTagName(KEY_ITEM);

        NodeList n2 = doc.getElementsByTagName(KEY_ITEM2);

        int displayPerPage = 10; // Per Page
        int TotalRows = nl.getLength();

        txtreord.setText(TotalRows + "Records|"); // number of records

        int indexRowStart = ((displayPerPage * currentPage) - displayPerPage);
        int TotalPage = 0;
        if (TotalRows <= displayPerPage) {
            TotalPage = 1;
        } else if ((TotalRows % displayPerPage) == 0) {
            TotalPage = (TotalRows / displayPerPage);
        } else {
            TotalPage = (TotalRows / displayPerPage) + 1; // 7
            TotalPage = (int) TotalPage; // 7
        }

        totalpage.setText("Page[" + TotalPage);

        int indexRowEnd = displayPerPage * currentPage; // 5
        if (indexRowEnd > TotalRows) {
            indexRowEnd = TotalRows;
        }

        // Disabled Button Next
        if (currentPage >= TotalPage) {
            btnNext.setEnabled(false);
        } else {
            btnNext.setEnabled(true);
        }

        // Disabled Button Previos
        if (currentPage <= 1) {
            btnPre.setEnabled(false);
        } else {
            btnPre.setEnabled(true);
        }

        // Load Data from Index
        int RowID = 1;
        ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, 
        HashMap<String, String> map;

        // RowID
        if (currentPage > 1) {
            RowID = (displayPerPage * (currentPage - 1)) + 1;
        }

        for (int i = indexRowStart; i < indexRowEnd; i++) {
            Element e = (Element) nl.item(i);

            Element e2 = (Element) n2.item(i);

            String date = e2.getAttribute(KEY_DATE);
            // adding each child node to HashMap key => value

            map = new HashMap<String, String>();
            map.put("RowID", String.valueOf(RowID));

            map.put(KEY_DATE, date);

            String mytime = date;
            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmdd");
            Date myDate = null;
            try {
                myDate = dateFormat.parse(mytime);

            } catch (ParseException t) {
                t.printStackTrace();
            } catch (java.text.ParseException t) {
                // TODO Auto-generated catch block
                t.printStackTrace();
            }

            SimpleDateFormat timeFormat = new SimpleDateFormat("yyyy-MM-dd");
            String finalDate = timeFormat.format(myDate);

            // System.out.println("rrrrrrrrrrrrr"+finalDate);

            String Heading = parser.getValue(e, KEY_NAME);

            int a = Heading.indexOf("|");
            String beforeSubString = Heading.substring(0, a);
            String afterSubString = Heading.substring(a, Heading.length())
                    .replace("|", "") + "[" + finalDate + "]";
            // String
            // final1="<b>"+beforeSubString+"<b>"+"|"+afterSubString.replace("|",
            // "|\n")
            // .replace("|", "");
            // String k=Html.fromHtml(final1).toString();
            //
            // Html.fromHtml(final1);

            map.put(KEY_NAME, beforeSubString);
            map.put(KEY_NAME1, afterSubString);

            // adding HashList to ArrayList
            menuItems.add(map);
            RowID = RowID + 1;
        }

    return null;
}

protected void onPostExecute(Void result) {


    progressDialog.dismiss();
    SimpleAdapter sAdap;
    sAdap = new SimpleAdapter(circularlistparsing.this, menuItems,
            R.layout.list_item,
            new String[] { "RowID", KEY_NAME1, KEY_NAME }, new int[] {
                    R.id.ColRowID, R.id.ColName, R.id.textView1 });
    lisView1.setAdapter(sAdap);
}
}
}