public Button stb;
static int cnt=0;
public ArrayList<RadioButton> Butgrp1 = new ArrayList<RadioButton>();
Timer myt; 
TimerTask t;
stb.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

myt.mschedule(new TimerTask() {

    @Override
    public void run() {

        // TODO Auto-generated method stub


        System.out.println("Entering run");
        Handler h=new Handler();

        h.post(new Runnable() {

            public void run() {

                // TODO Auto-generated method stub
                runOnUiThread(new Runnable() {

                    public void run() {
                        // TODO Auto-generated method stub
                        Butgrp1.get(cnt).setChecked(true);
                        cnt=cnt+1;
                        if(cnt>4)
                            cnt=0;
                        if(cnt>0)
                        //  Butgrp1.get(cnt-1).setChecked(false);
                        System.out.println(cnt);
                    }
                });


            }
        });

        //rg.getChildAt(cnt).setPressed(true);

    }
},1000,2000);

我需要访问的用户界面一组单选按钮，并设置为定期检查，但我不断收到不同的错误，我意识到我必须使用一个处理程序，但它仍然没有工作......任何人都可以请告诉我，我错了....我是新手，我尝试的东西，了解了更好的工作......请帮助...

I need to access a group of radio buttons on the ui and set it as checked at regular intervals, but i keep getting different errors, i realized i must use a handler, but its still not working...can anyone please tell me where i am going wrong....am a newbie and am trying out stuff to understand the working better...please help...

推荐答案

您必须在UI线程，即的onCreate创建处理程序 的活动的。

You have to create the Handler in the UI Thread, i.e. in onCreate of your Activity.

由于你在后台线程中的运行方法来创建它，该处理程序将在同样的后台线程执行你的code。

Because you create it in the run method of a background thread, the handler will execute your code in that very same background thread.

您也可以初始化处理程序直接：

public class MyActivity extends Activity{

    private Handler handler = new Handler();

    //more code
}

和那么就不要使用 runOnUIThread ：

 handler.post(new Runnable() {
           public void run() {
                    // TODO Auto-generated method stub
                    Butgrp1.get(cnt).setChecked(true);
                    cnt=cnt+1;
                    if(cnt>4)
                        cnt=0;
                    if(cnt>0)
                    //  Butgrp1.get(cnt-1).setChecked(false);
                    System.out.println(cnt);
                }
            });

编辑： 好吧试试这个清理code。因为你没有发布完整的活动，这将无法工作开箱：

Ok try this cleaned up code. Because you did not post your full Activity this won't work out of the box:

public class TestActivity extends Activity {

    private Button button;
    static int cnt=0;
    public ArrayList<RadioButton> buttonArray = new ArrayList<RadioButton>();
    private Timer timer = new Timer(); 

    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);

        button.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                timer.schedule(new MyTimerTask(), 1000,2000);
            }
        });
    }


    private void doButtonStuff(){
        buttonArray.get(cnt).setChecked(true);
        cnt=cnt+1;
        if(cnt>4){
            cnt=0;
        }
        if(cnt>0){
            //  Butgrp1.get(cnt-1).setChecked(false);
            System.out.println(cnt);
        }
    }

    private class MyTimerTask extends TimerTask{

        @Override
        public void run() {        
            runOnUiThread(new Runnable() {              
                @Override
                public void run() {
                    doButtonStuff();
                }
            });
        }       
    }
}