java ProgressDialog：显示后不解除

Question

    private void copyFile(AppDB apkfile) {
    ProgressDialog pd=new ProgressDialog(this,ProgressDialog.STYLE_SPINNER);
    pd.show(this,"Coping ...",apkfile.name,true,true);
    File f1 = new File(apkfile.location);
    try {
        String fileName = apkfile.name;
        File f2 = new File(Environment.getExternalStorageDirectory().toString() + "/" + "Easy Share");
        f2.mkdirs();
        f2 = new File(f2.getPath() + "/" + fileName + ".apk");
        f2.createNewFile();
        InputStream in = new FileInputStream(f1);
        OutputStream out = new FileOutputStream(f2);
        byte[] buf = new byte[1024];
        int len;
        while ((len = in.read(buf)) > 0) {
            out.write(buf, 0, len);
        }
        in.close();
        out.close();
    } catch (FileNotFoundException ex) {
        Toast.makeText(this, ex.getMessage() + " in the specified directory.", Toast.LENGTH_SHORT);

    } catch (IOException e) {
        Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT);
    }
    if(pd.isShowing()) {
   pd.dismiss();}

}

大家好，当试图关闭进度对话框时，它不会这样做，并研究了许多解决方案，但我不知道它的相同问题。 请帮忙

更新：运行后有进度对话框pd的类

Answer 1

复制应该在线程或异步任务中完成。在执行AsyncTask之前显示对话框并隐藏在onPOstExecute中

protected void onPostExecute(Long result) {
       if(mProgressDialog.isShowing()) {
          mProgressDialog.dismiss();}
       }  
}

Answer 2

尝试使用finally

private void copyFile(AppDB apkfile) {
    ProgressDialog pd=new ProgressDialog(this,ProgressDialog.STYLE_SPINNER);
    pd.show(this,"Coping ...",apkfile.name,true,true);
    File f1 = new File(apkfile.location);
    try {
        String fileName = apkfile.name;
        File f2 = new File(Environment.getExternalStorageDirectory().toString() + "/" + "Easy Share");
        f2.mkdirs();
        f2 = new File(f2.getPath() + "/" + fileName + ".apk");
        f2.createNewFile();
        InputStream in = new FileInputStream(f1);
        OutputStream out = new FileOutputStream(f2);
        byte[] buf = new byte[1024];
        int len;
        while ((len = in.read(buf)) > 0) {
            out.write(buf, 0, len);
        }
        in.close();
        out.close();
    } catch (FileNotFoundException ex) {
        Toast.makeText(this, ex.getMessage() + " in the specified directory.", Toast.LENGTH_SHORT);

    } catch (IOException e) {
        Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT);
    } finally {
      if(pd.isShowing()) {
        pd.dismiss();
      }
    }
}

Answer 3

它运行良好，我将告诉你两种可能性

1. 最后请在try块中使用它作为

   try {
       String fileName = apkfile.name;
       File f2 = new File(Environment.getExternalStorageDirectory().toString() + "/" + "Easy Share");
       f2.mkdirs();
       f2 = new File(f2.getPath() + "/" + fileName + ".apk");
       f2.createNewFile();
       InputStream in = new FileInputStream(f1);
       OutputStream out = new FileOutputStream(f2);
       byte[] buf = new byte[1024];
       int len;
       while ((len = in.read(buf)) > 0) {
           out.write(buf, 0, len);
       }
       in.close();
       out.close();
      if(pd.isShowing()) {
      pd.dismiss();}
       } catch (FileNotFoundException ex) {
           Toast.makeText(this, ex.getMessage() + " in the specified directory.", Toast.LENGTH_SHORT);
      } catch (IOException e) {
       Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT);
   }
   

   }

二是 延期使用