java - Android 进度对话框未关闭

Question

我想在页面布局中显示进度对话框。我在下面的代码中实现了。进度对话框未关闭并且继续运行。当我单击上一页中的图像时，它将导航到下一个布局，我希望此布局在从服务器下载所有数据并将其显示在列表中之前显示进度对话框当前的布局。显示进度对话框并在后台显示列表，但进度对话框继续运行并且不会关闭。我不知道我哪里错了。请帮忙。

ProgressDialog pg;
String[] ar;
public void onCreate(Bundle savedInstanceState) 
{

         super.onCreate(savedInstanceState);
         setContentView(R.layout.filename);
         pg=ProgressDialog.show(this, "ABC", "Downloading .....",true);  

         Thread dt= new Thread(new Runnable() 
        {
            public void run() 
            {
                try
                {
                     String addr=Util.url;
                     URL url = new URL(urlname);
                     HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
                     urlConnection.setConnectTimeout(5000);             
                     InputStream in = new BufferedInputStream(urlConnection.getInputStream());
                     BufferedReader r = new BufferedReader(new InputStreamReader(in));
                     String x = "";
                     String total = "";
                     int i=0;
                     ArrayList<String> content = new ArrayList();
                     while((x = r.readLine()) != null)
                    {
                        content.add(x);
                    }
                    in.close();
                    r.close();
                    ar= content.toArray(new String[content.size()]);

                }
                catch(Exception e1){
                     handler.sendEmptyMessage(0);
                }

            }

        });

        dt.start();
        try{
            dt.join();

        }catch(Exception e){
            handler.sendEmptyMessage(0);
        }

    try{   
        if(ar[0].toString().trim()!="")
        {
             android.view.Display display1 = ((android.view.WindowManager)getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
             TableLayout tbl1 = (TableLayout)findViewById(R.id.tableLayout2);

             TableRow newRow1 = (TableRow) new TableRow(this);
             TextView txt=(TextView) new TextView(this);
             txt.setText("No");
             txt.setGravity(Gravity.LEFT);
             txt.setTextColor(Color.RED);
             txt.setTextSize(18);

             TextView txt1=(TextView) new TextView(this);
             txt1.setText("NAME");
             txt1.setTextColor(Color.RED);
             txt1.setTextSize(18);
             txt1.setGravity(3);

             TextView txt2=(TextView) new TextView(this);
             txt2.setText("DATE");

             txt2.setTextColor(Color.RED);
             txt2.setTextSize(18);
             txt.setGravity(3);

             TextView txt3=(TextView) new TextView(this);
             txt3.setText("VALUE");
             txt3.setTextColor(Color.RED);
             txt3.setTextSize(18);
             txt3.setGravity(Gravity.RIGHT);


             txt.setWidth((int)(display1.getWidth()/4));
             txt1.setWidth((int)(display1.getWidth()/4));
             txt3.setWidth((int)(display1.getWidth()/4)); 
             txt2.setWidth((int)(display1.getWidth()/4));


             newRow1.addView(txt2);
             newRow1.addView(txt);
             newRow1.addView(txt1);
             newRow1.addView(txt3);
             tbl1.addView(newRow1);

            for(int t=0;t<(ar.length);t++)
            {
            android.view.Display display = ((android.view.WindowManager)getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
            TableLayout tbl = (TableLayout)findViewById(R.id.tableLayout1);
            TableRow newRow = (TableRow) new TableRow(this);
            newRow.setClickable(true);
            TextView tx=(TextView) new TextView(this);
            String temp=ar[t].toString();
            tx.setText(temp);
            tx.setTextColor(Color.WHITE);
            tx.setGravity(Gravity.LEFT);
            tx.setTextSize(15);

            t=t+1;

            TextView tx1=new TextView(this);
            tx1.setText(ar[t].toString());
            tx1.setGravity(Gravity.LEFT);
            tx1.setTextColor(Color.WHITE);
            tx1.setTextSize(15);


            t=t+1;

            TextView tx2=new TextView(this);
            tx2.setText(ar[t].toString());
            tx2.setGravity(Gravity.LEFT);
            tx2.setTextColor(Color.WHITE);
            tx2.setTextSize(15);

            t=t+1;

            TextView tx3=new TextView(this);
            tx3.setText(ar[t].toString());
            tx3.setGravity(Gravity.RIGHT);
            tx3.setTextColor(Color.WHITE);
            tx3.setTextSize(15);

            tx3.setWidth((int)(display.getWidth()/4));
            tx.setWidth((int)(display.getWidth()/4));
            tx1.setWidth((int)(display.getWidth()/4));
            tx2.setWidth((int)(display.getWidth()/4));

            newRow.addView(tx);
            newRow.addView(tx2);
            newRow.addView(tx1);
            newRow.addView(tx3);

             newRow.setId(t);

            tbl.addView(newRow);
            }

        }
    }
    catch(Exception e){
        pg.dismiss();
        handler.sendEmptyMessage(0); 
    }

}
private Handler handler = new Handler() {
    @Override 
          public void handleMessage(Message msg) {

        Toast.makeText(this,"Network not available!.... ", Toast.LENGTH_LONG).show();
}
};

Answer 1

将此行添加到您想要关闭对话框的位置。

if(pg.isShowing())pg.dismiss();