Android Handler's postDelayed method and encounter problems

Preface

Recently, I discovered a wrong way to use it.

Just direct new like this

new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                ();
            }
        }, 1000);

This usage is also true for simple business situations. For example, close a dialog regularly

But for complex business scenarios, it is wrong to use it like this, and it is not wrong to use it like this. There are bugs if you use it like this.

Problems encountered

I use it directlynew Handler()Method to execute a method to play voice
The code is as follows

//todo here to detect  new Handler().postDelayed(new Runnable() {
                @Override
                public void run() {
                    if (!()) {
                        (context, .pay_tips);
                    }
                }
            }, 15 * 1000);

I thought it was correct to write this, but there was a problem during the test
The page is closed. This voice broadcast continues. Hahaha, my colleague was shocked when he heard it.
The page is gone, the voice is still playing, it's embarrassing
I heard the problem at the time when I heard this voice

Because I thought something was wrong and there might be something wrong, so I added oneTODOmark
Tip: There may be problems here

Solution

In the final analysis, it is still my writing problem. Not formal enough. Lazy behavior. Hahaha

1. Create a Handler object first

Handler handler=new Handler();

2. Then create a Runnable object

Runnable runnable=new Runnable(){
   @Override
   public void run() {
	    // TODO Auto-generated method stub
   	    //What to do, call this Runnable object again here to implement the timer operation every two seconds    (this, 2000);
   }
};

3. Use the PostDelayed method and call this Runnable object in two seconds.

In fact, it implements a 2s timer

(runnable, 2000);

4. If you want to turn off this timer, you can do this

(runnable);

Handler timer correct usage

//Initialize first private Handler handler;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        (savedInstanceState);
        setContentView(.activity_main);
        handler = new Handler();
 
        Runnable runnable = new Runnable() {
            @Override
            public void run() {
                // This is a loop. Buy Toast once every 3s in intervals                (this, 3 *1000);
                (this, "Delay 5s", Toast.LENGTH_SHORT).show();
            }
        };
        // Delay 2s toast        (runnable,2000);
    }
 
    @Override
    protected void onDestroy() {
        ();
        //Clear queue message at the end of the page        if (handler != null) {
            (null);
            handler = null;
        }
    }

This is the article about the method of closing postDelayed() of Android Handler. For more information about closing postDelayed() of Android Handler, please search for my previous articles or continue browsing the related articles below. I hope everyone will support me in the future!