android如果顯示對話框

-1

我有振動和搖動議案我想顯示對話框。當有多個搖動執行時，我有問題，因此會顯示多個對話框。我想在時間只顯示一個對話框。android如果顯示對話框

所以我寫了這段代碼，但它顯示錯誤。一號線要「最終AlertDialog」和另一行希望它沒有「最終」

 public void onShake() { 

     final AlertDialog builder = null; 
     if(!builder.isShowing()){ 

      builder = new AlertDialog.Builder(getParent()).create(); -- error if final is casted on AlertDialog -- "The final local variable builder cannot be assigned. It must be blank and not using a compound assignment" 

      builder.setTitle("Shake"); 


      builder.setButton("OK", new DialogInterface.OnClickListener(){ 
       public void onClick(DialogInterface dialog, int which){ 
        builder.dismiss(); -- requires final AlertDialog -- "Cannot refer to a non-final variable builder inside an inner class defined in a different method" 

       } 
      }); 
      builder.show(); 

     }}

編輯：謝謝，dialog.builder（）;看起來工作。但現在我遇到了新的問題 - NullPointerException，拋出線我檢查是否顯示警報對話框。現在我嘗試：

if(builder.isShowing() == false)

固定的NullPointerException

if(builder == null){ 
builder.setButton("OK", new DialogInterface.OnClickListener(){ 
       public void onClick(DialogInterface dialog, int which){ 
        dialog.dismiss(); 
        builder = null; 
} 
}

來源

2012-12-13 kort.es