java - 第二次加载时进度条失败

Question

我有一个简单的函数，它显示在获取数据时加载微调器(通常需要 7 秒左右)

private void load_data(View v)
{
    task_complete = false;
    progressBar = new ProgressDialog(v.getContext());
    progressBar.setCancelable(false);
    progressBar.setMessage("Fetching data ...");
    progressBar.setProgressStyle(ProgressDialog.STYLE_SPINNER);
    progressBar.show();

    try
    {
        Log.v("thread", "Starting thread");
        new Thread(new Runnable()
        {
            public void run()
            {
                while(!task_complete)
                {
                    fetch_data();
                    try
                    {
                        Thread.sleep(1000);
                    }
                    catch(InterruptedException e)
                    {
                        e.printStackTrace();
                    }
                }
                progressBar.dismiss();
            }
        }).start();
        Log.v("thread", "Thread finished successfully");
    }
    catch(Exception e)
    {
        Log.v("thread", "fail "+e.toString());
    }
}

我遇到的问题是该函数由 onClick 通过

调用

load.setOnClickListener(new View.OnClickListener()
{
    public void onClick(View v)
    {
        load_data(v);
        show_data(v); // shows the data on a spinner
    }
});

当我第二次按下加载按钮时，出现错误。我的日志确实显示了

Starting thread
Thread finished successfully

但不知何故应用程序死于错误说

03-27 02:48:39.282: E/AndroidRuntime(956): Uncaught handler: thread Thread-9 exiting due to uncaught exception
03-27 02:48:39.293: E/AndroidRuntime(956): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
03-27 02:48:39.293: E/AndroidRuntime(956):  at android.view.ViewRoot.checkThread(ViewRoot.java:2683)

如果有人能告诉我或向我解释导致错误的原因，我将不胜感激

Answer 1

问题是你的 progressBar.dismiss();在另一个线程中执行，要使其在 UI 线程中运行，请执行以下操作:

    runOnUiThread(new Runnable() {

        @Override
        public void run() {
            progressBar.dismiss();
        }
    });