Android：AsyncTask timeout

Question

是否有可能执行启动画面来执行HTTP请求，如果此请求执行时间过长（即7-10秒），则中止请求并跳转到主要活动？

下面的代码是我做的，但它不工作 - 超时不起作用，HTTP请求和跳跃正在工作。据我所知，有可能延迟使用AsyncTask的get()方法或处理程序。 Get()方法应该在单独的线程中，但它不起作用。如何做这个任务？

编辑：

public class SplashActivity extends Activity { 
private static final String TAG = "SplashActivity"; 
private Handler handler = new Handler(); 
private Runnable r; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.splash_layout); 

    if (Helpers.isNetworkConnected(getApplicationContext())) { 
     Log.d(TAG, "Has Internet"); 
     final DownloadFAQ downloadFAQ = new DownloadFAQ(); 
     new Thread(new Runnable() { 
      public void run() { 
       try { 
        Log.d(TAG, "Timing..."); 
        downloadFAQ.execute().get(1000, TimeUnit.MILLISECONDS); 

        SplashActivity.this.runOnUiThread(new Runnable() { 
         public void run() { 
          Log.d(TAG, "redirect"); 
          redirect(); 
         } 
        }); 
       } catch (InterruptedException e) { 
        e.printStackTrace(); 
       } catch (ExecutionException e) { 
        e.printStackTrace(); 
       } catch (TimeoutException e) { 
        downloadFAQ.cancel(true); 
        Log.d(TAG, "Task has benn canceled"); 
        if (downloadFAQ.isCancelled()) 
         redirect(); 
       } 
      } 
     }).start(); 
    } else { 

     r = new Runnable() { 
      public void run() { 
       redirect(); 
      } 
     }; 
     handler.postDelayed(r, 2500); 
    } 
} 

private class DownloadFAQ extends AsyncTask<Void, Void, Void> { 
    @Override 
    protected Void doInBackground(Void... params) { 
     Log.d(TAG, "Execute task"); 
     ServerAPI server = new ServerAPI(getApplicationContext()); 
     server.serverRequest(ServerAPI.GET_FAQ, null); 
     return null; 
    } 
} 

private void redirect() { 
    Intent i = new Intent(SplashActivity.this, TabsActivity.class); 
    startActivity(i); 
    finish(); 
} 

@Override 
protected void onDestroy() { 
    super.onDestroy(); 
    handler.removeCallbacks(r); 
} 

}

Answer 1

因为你试图再次启动的AsyncTask里面doInBackground时，它仍在运行。改变你的代码，得到它的工作：

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.splash_layout); 
    downloadFAQ = new DownloadFAQ(); 
    new Thread(new Runnable() { 
      public void run() { 
       try { 
        downloadFAQ.execute().get(2000, TimeUnit.MILLISECONDS); 

        SplashActivity.thisrunOnUiThread(new Runnable() { 
         public void run() { 
         // start Activity here 
          Intent i = new Intent(SplashActivity.this, 
                 TabsActivity.class); 
          SplashActivity.this.startActivity(i); 
          SplashActivity.this.finish(); 
         } 
        }); 
       } catch (InterruptedException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } catch (ExecutionException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } catch (TimeoutException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 
      } 
     }).start(); 
} 

，你将需要从doInBackground方法去除downloadFAQ.get(2000, TimeUnit.MILLISECONDS);改变你的AsyncTask作为

private class DownloadFAQ extends AsyncTask<Void, Void, Void> { 
    @Override 
    protected Void doInBackground(Void... params) { 
     ServerAPI server = new ServerAPI(getApplicationContext()); 
     server.serverRequest(ServerAPI.GET_FAQ, null); 
     return null; 
    } 

    protected void onPostExecute(Void result) { 

    } 

} 

Answer 2

考虑使用的AsyncTask状态： AsyncTask.Status