为什么我的进度条不能正常增加？

Question

我试图在收到的广播上增加进度条，但从我的角度来看， myProgressDialog.incrementProgressBy(increment); 代码没有任何效果。我尝试将命令放置在不同的地方，但我仍然看不到任何效果。

这是我的代码的样子。

public static final int max = 180;
public final static int increment = (1/180);

  @Override
   public void onCreate(Bundle savedInstanceState) {
            ...
        i = new Intent();
    i.setAction(ITEM_CREATED);
    registerReceiver(myBroadcastReceiver, new IntentFilter(ITEM_CREATED));              
        findFeeds = new Runnable(){
           @Override
           public void run() 
            {
              getFeedObjects();
            }
           };
           beginThread();
        } 

 public static Context getAppContext() {
    return context;
}

private void beginThread()
{
    switch (checkConnectionState(OffsideLiteActivity.this))
    {
        case 0:
        thread =  new Thread(null, findItems, "DoingInBackground");
        thread.start();
        myProgressDialog = new ProgressDialog(this);
            myProgressDialog.setCancelable(true);
            myProgressDialog.setMessage("Loading...");
            myProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
            myProgressDialog.setProgress(0);
            myProgressDialog.setMax(max);
            myProgressDialog.show();

        break;
        case 1:
        connectionError();
        break;
        default:
    }
}

     private BroadcastReceiver myBroadcastReceiver =
    new BroadcastReceiver() {

        @Override
        public void onReceive(Context context, Intent intent) 
        {
            myProgressDialog.incrementProgressBy(increment);
            Log.d("RECEIVED", "Broadcast received");
        }

   };

有趣的是，logcat 注册了我在 myProgressDialog.incrementProgressBy(increment); 代码

logcat
之后放置的 Broadcast receive 日志

08-03 13:56:15.109: DEBUG/RECEIVED(8666): Broadcast received
08-03 13:56:15.109: DEBUG/RECEIVED(8666): Broadcast received
08-03 13:56:15.109: DEBUG/RECEIVED(8666): Broadcast received
08-03 13:56:15.109: DEBUG/RECEIVED(8666): Broadcast received
08-03 13:56:15.109: DEBUG/RECEIVED(8666): Broadcast received

就像我说的，我尝试将myProgressDialog.incrementProgressBy(increment); 在我的代码中的其他地方命令，但无济于事。有什么建议吗？

Answer 1

问题可能出在这一行：

public final static int increment = (1/180);

我相信 int 会被截断为 0，因此您只需将进度对话框增加 0。您可能希望增量为 1。

Answer 2

与其使用广播接收器来更新你的 UI，你不能只使用类似观察者可观察模式的东西吗？然后侦听器将在 UI 线程中运行 UI 更新，如下所示：

public void updateUIRequested( int increment )
{
   runOnUIThread( new Runnable() { myProgressDialog.incrementProgressBy(increment); } );
}//met

或者如果你想要更现代的东西，请使用 AsyncTask并仍然在 UI 线程中运行更新。

问候，
史蒂芬

Answer 3

尝试将调试点放在 myProgressDialog.incrementProgressBy() 处......增量的值是多少？我的猜测是它可能是 0。或者将您的日志更改为：

Log.d("RECEIVED", "Broadcast received, increment by " + increment);