Question

点击按钮后，我正尝试这样做：

case R.id.bcheckConnection:
        if (IPok()) {
            PlcState.ErrPlc = false;
            Constant.adressIpPlc = adresIp.getText().toString();

            final ProgressDialog dialog =     ProgressDialog.show(Main.this, "", "Trying to connect...");
            new Thread(new Runnable() {
                public void run() {
                    timeout = network.testConnection(Constant.adressIpPlc, 102, 20000);
                    dialog.dismiss();
                }
            }).start();

            if (timeout > -1) {
                PlcState.ErrPlc = false;

                stanPolaczenia.setText("Connection established. Timeout = ");
                stanTimeout.setText(Long.toString(timeout));
                currentIp.setText(Constant.adressIpPlc);

            } else {
                PlcState.ErrPlc = true;
                stanPolaczenia.setText("Error");
                stanTimeout.setText("");
                currentIp.setText(Constant.adressIpPlc);
            }
        } else {
            Toast.makeText(Main.this, "Wrong IP", Toast.LENGTH_LONG).show();
        }
        break;

因此可以在线程停止运行后更改文本吗？

Answer 1

您可以使用Thread.join()来阻止当前线程，直到给定的线程完成：

Thread myThread = new Thread(new Runnable() {
    public void run() {
       // Do something
    }
});
myThread.start();

// Do some things

// and block current thread until myThread is finished
myThread.join();

// Continue execution after myThread got finished

修改：正如@Eric已在问题评论中提及：对于您的（示例）情况，使用AsyncTask似乎更有意义。它有两个事件（在UI线程上调用），因此您可以使用进度更新和任务完成时更新UI。有关AsyncTask示例，请参阅：AsyncTask Android example

在值更改时更改TextView文本

1 个答案: