将Android按钮设置为在一段时间后可见？

Question

I have a button that I don't want to be clickable until a certain amount of time has run (say, 5 seconds?) I tried creating a thread like this

    continueButtonThread =  new Thread()
    {
        @Override
        public void run()
        {
            try {
                synchronized(this){
                    wait(5000);
                }
            }
            catch(InterruptedException ex){                    
            }

            continueButton.setVisibility(0);                
        }
    };

    continueButtonThread.start();

But I can't modify the setVisibility property of the button within a different thread. This is the error from the LogCat:

10-02 14:35:05.908: ERROR/AndroidRuntime(14400): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.

Any other way to get around this?

Answer 1

The problem is that you can touch views of your activity only in UI thread. you can do it by using runOnUiThread function. I would like to suggest you to use

handler.postDelayed(runnable, 5000)`

Answer 2

You must update your view from UI-thread. What you are doing is you are updating from non-ui-thread.

Use

contextrunOnUiThread(new Runnable(){

        @Override
        public void run() {
            // TODO Auto-generated method stub

        }});

or use handler and signalize hand.sendMessage(msg) when you think is right time to update the view visibility

 Handler hand = new Handler()        
        {

            @Override
            public void handleMessage(Message msg) {
                /// here change the visibility
                super.handleMessage(msg);
            }

        };

Answer 3

您可以使用View类中的postDelayed方法（一个Button是View的子级）

Answer 4

here is simple answer i found

Button button = (Button)findViewBYId(R.id.button);
button .setVisibility(View.INVISIBLE);
button .postDelayed(new Runnable() {
    public void run() {
        button .setVisibility(View.VISIBLE);
    }
}, 7000);