安卓進度對話框上提高近

Question

我做了一個實用程序類來打開和關閉進度對話框這樣

Utils.java

public class Utils { 

    private static Utils util; 
    private Typeface typeface; 
    private ProgressDialog progressDialog; 

    public static Utils getInstance(){ 

     if(util == null){ 
      util = new Utils(); 
     } 
     return util; 
    } 

    public void showProgressDialog(Activity activity){ 

     if(progressDialog != null && progressDialog.isShowing()){ 
      return; 
     } 

     if(progressDialog == null) { 
      progressDialog = new ProgressDialog(activity); 
     } 
     progressDialog.setMessage("Loading..."); 
     progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER); 
     progressDialog.setCancelable(false); 
     progressDialog.show(); 
    } 

public void closeProgressDialog(){ 
    try { 
     if (progressDialog != null && progressDialog.isShowing()) { 
      progressDialog.dismiss(); 
      progressDialog = null; 
     } 
    }catch(Exception e){ 
     e.printStackTrace(); 
    } 
    } 
} 

，然後我之前的數據加載後的數據和closeProgressDialog調用showProgressDialog已被加載。這樣

Acvitity代碼

public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 

    View view = inflater.inflate(R.layout.fragment_dashboard,container,false); 
    activity = getActivity(); 
    ButterKnife.bind(this,view); 

    init(); 
    return view; 
} 

    private void init() { 

    Utils.getInstance().showProgressDialog(activity); 
    getPatientsList(); 


    //in response i am calling closeProgressDialog(); 
    } 

public void onPatientListResponse(String response){ 
     Utils.getInstance().closeProgressDialog(); // raises exception here 
    } 

但它在closeProgressDialog產生異常（）;

java.lang.IllegalArgumentException: View=com.android.internal.policy.PhoneWindow$DecorView{f7fd12e V.E...... R......D 0,0-1024,232} not attached to window manager 

Answer 1

試試這個，

反正ü[R檢查progressDialog是否已經顯示出，如果是ü[R剛剛返回控制。而不是解僱progressDialog並創建一個新實例。因爲舊的進度Dialog可能以不同的上下文開始。

public void showProgressDialog(Activity activity){ 

     if(progressDialog != null && progressDialog.isShowing()){ 
      progressDialog.dismiss(); 
      progressDialog = null; 
     } 

     if(progressDialog == null) { 
      progressDialog = new ProgressDialog(activity); 
     } 
     progressDialog.setMessage("Loading..."); 
     progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER); 
     progressDialog.setCancelable(false); 

     if(!activity.isFinishing()) 
      progressDialog.show(); 
    } 

Answer 2

您還沒有初始化的進度條和你要檢查，如果它顯示...

在這裏你尚未初始化進度，但因爲你的條件是& &（AND）編譯器應該同時檢查，發現progressDialog是空的，因此有沒有爲它isShowing方法...

if(progressDialog != null && progressDialog.isShowing()){ 
     return; 
    } 
-------------------------------------------------- 
public void showProgressDialog(Activity activity){ 
    if(progressDialog == null) { 
     progressDialog = new ProgressDialog(activity); 
    } 
    progressDialog.setMessage("Loading..."); 
    progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER); 
    progressDialog.setCancelable(false); 
    progressDialog.show(); 
} 

一個建議是使用語境，而不是活動的進度。

乾杯！

Answer 3

public void showProgressDialog(Activity activity){ 

     if(progressDialog != null){ // Ensure it's not null 
      if(progressDialog.isShowing()) // if it's showing than return. 
      return; 
     }else{ 
      //It will create an instance of new object. 
      progressDialog = new ProgressDialog(activity); 
     } 

     progressDialog.setMessage("Loading..."); 
     progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER); 
     progressDialog.setCancelable(false); 
     progressDialog.show(); 
    }