java - Android Dev:在UI线程中运行TimerTask

我正在尝试更新TextView。

该方法位于我的主类中，在onCreate()中调用；

我尝试使用runOnUiThread()无济于事。

一旦达到30秒并尝试更新TextView，它就会崩溃！

任何帮助表示赞赏：

public void updateDisplay() {
    Timer timer = new Timer();


    timer.schedule(new TimerTask() {


                       public void run() {
                           Calendar c = Calendar.getInstance();
                           int mYear = c.get(Calendar.YEAR);
                           int mMonth = c.get(Calendar.MONTH);
                           int mDay = c.get(Calendar.DAY_OF_MONTH);
                           int mHour = c.get(Calendar.HOUR_OF_DAY);
                           int mMinute = c.get(Calendar.MINUTE);

                           textView3.setText(new StringBuilder()
                                   // Month is 0 based so add 1
                                   .append(mDay).append("/")
                                   .append(mMonth + 1).append("/")
                                   .append(mYear)
                                   .append(" - ")
                                   .append(mHour)
                                   .append(":")
                                   .append(mMinute));
                       }
                   }

            ,0,30000);//Update text every 30 seconds
}

错误是：

E/AndroidRuntime: FATAL EXCEPTION: Timer-0
              Process: ggrgroup.com.workforceapp, PID: 21879
              android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
                  at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:7261)
                  at android.view.ViewRootImpl.invalidateChildInParent(ViewRootImpl.java:1100)
                  at android.view.ViewGroup.invalidateChild(ViewGroup.java:5219)
                  at android.view.View.invalidateInternal(View.java:12900)
                  at android.view.View.invalidate(View.java:12860)
                  at android.view.View.invalidate(View.java:12844)
                  at android.widget.TextView.checkForRelayout(TextView.java:7459)
                  at android.widget.TextView.setText(TextView.java:4390)
                  at android.widget.TextView.setText(TextView.java:4247)
                  at android.widget.TextView.setText(TextView.java:4222)
                  at ggrgroup.com.workforceapp.MainActivity$1.run(MainActivity.java:77)
                  at java.util.Timer$TimerImpl.run(Timer.java:284)

最佳答案

    public void updateDisplay() {
      Timer timer = new Timer();
      timer.schedule(new TimerTask() {

    @Override
    public void run() {
        // Your logic here...

        // When you need to modify a UI element, do so on the UI thread.
        // 'getActivity()' is required as this is being ran from a Fragment.
        getActivity().runOnUiThread(new Runnable() {
            @Override
            public void run() {
                // This code will always run on the UI thread, therefore is safe to modify UI elements.
                myTextBox.setText("my text");
            }
        });
    }
}, 0, 30000); // End of your timer code.

 }

关于java - Android Dev:在UI线程中运行TimerTask，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/47198692/