無法關閉Android應用程序中的ProgressDialog

Question

我是初學Android程序員。嘗試使用AsyncTask和ProgressDialog但遇到問題 - ProgressDialog無法解除。

下面的代碼是延伸活動的importExportActivity內 - 做了很多的谷歌搜索的

public class ProgressTask extends AsyncTask<Void, Void, Void> {  
    ProgressDialog dialog1 = new ProgressDialog(importExportActivity.this); 

    protected void onPreExecute() { 
      this.dialog1.show(importExportActivity.this, "", 
            "Please wait for few seconds...", true); 
    } 

    @Override 
    protected void onPostExecute(final Void success) { 
      dialog1.dismiss(); 
    } 

    protected Void doInBackground(final Void ... args) { 
       ...... did the main logic .... 
      return null; 
    } 
} 

，但似乎無法找到一個解決的辦法。

有人可以幫忙嗎？

Answer 1

protected void onPreExecute() { 
     this.dialog1.show(importExportActivity.this, "", 
           "Please wait for few seconds...", true); 
     super.onPreExecute(); 
} 

@Override 
protected void onPostExecute(final Void success) { 
     dialog1.dismiss(); 
     super.onPostExecute(RESULT); 
}  

礦以這種方式工作...

Answer 2

我覺得不必返回：

@Override 
protected void onPostExecute(final Void success) { 
     dialog1.dismiss(); 
    return; 

} 

Answer 3

回答我的問題。以下工作：

public class ProgressTask extends AsyncTask<Void, Void, Void> {  
ProgressDialog dialog1; 

protected void onPreExecute() { 
     dialog1 = ProgressDialog.show(importExportActivity.this, "", 
           "Please wait for few seconds...", true); 
} 

@Override 
protected void onPostExecute(final Void success) { 
     dialog1.dismiss(); 
} 

protected Void doInBackground(final Void ... args) { 
      ...... did the main logic .... 
     return null; 
} 

}