顯示進度對話框+暫停代碼執行時在後臺加載

Question

對於囉嗦的標題我很抱歉 - 我不確定如何正確地描述它。我想（在我的onCreate（）方法）：

-Initialize一些事情

-display進度對話框，而我從我的後端

加載一些數據-clear進度對話框，然後繼續與代碼

我明白了典型的進度對話框的解決方案是一個asynctask，我試過使用（見下文）。但是，這並不會像我想要的那樣鎖定代碼執行。在lwpd.execute（）之後的代碼依賴於已經發生的加載。我是否在過度複雜？什麼是做我想做的正確方法？

僅供參考，我的AsyncTask實現：

public class LoadWithProgressDialog extends AsyncTask<Void, Void, Boolean>{ 
    private ProgressDialog pd; //the progress dialog 
    private String title; //the title of the progress dialog 
    private String message; //the body of the progress dialog 
    private Runnable task; //contains the code we want to run in the background 
    private Context c; 


    public LoadWithProgressDialog(Context context,String t, String m,Runnable r){ 
     super(); 
     c = context; 
     task = r; 
     title = t; 
     message = m; 
    } 

    @Override 
    protected void onPreExecute(){ 
     pd = ProgressDialog.show(c,title, message, false, false); 
    } 

    @Override 
    protected Boolean doInBackground(Void... params) { 
     task.run(); 
     return true; 
    } 
    @Override 
    protected void onPostExecute(Boolean result) { 
      pd.dismiss(); 
    } 





} 

和

super.onCreate(savedInstanceState); 
      setContentView(R.layout.main); 

      //initialize variables 


      LoadWithProgressDialog lwpd = new LoadWithProgressDialog(this,"Loading","Loading Truck Data", new Runnable() { 
       public void run(){ 
        //code that loads things 
       } 
      }); 
      lwpd.execute(); 

//continue on with my code 

} 

Answer 1

你應該保持進步異步任務對話框。

您想在數據加載後執行的任何代碼都可以放在onPostExecute方法中！

public LoadWithProgressDialog(Context context,String t, String m,Runnable r){ 
    super(); 
    c = context; 
    task = r; 
    title = t; 
    message = m; 
} 

@Override 
protected void onPreExecute(){ 
    pd = ProgressDialog.show(c,title, message, false, false); 
} 

@Override 
protected Boolean doInBackground(Void... params) { 
    task.run(); 
    return true; 
} 
@Override 
protected void onPostExecute(Boolean result) { 
     pd.dismiss(); 

     // PUT YOUR CODE THAT YOU WANT TO RUN AFTER THE DATA HAS LOADED HERE! 
} 

Answer 2

非鎖定代碼執行是AsyncTask的要點。如果你想要它阻止代碼執行，只需在主線程上創建一個ProgressDialog