不执行按钮单击事件 [英] Button Click event not performed

问题描述

我已经写在OnCreate以下code（）Activity类的方法

I have write the following code in the onCreate() method of Activity class

Button btn=(Button)findViewById(R.id.button1);
        btn.setOnClickListener(new View.OnClickListener()
        {
            public void onClick(View v) 
            {
                WindowManager.LayoutParams params = getWindow().getAttributes();
                params.screenBrightness = 0;
                getWindow().setAttributes(params);
                Toast.makeText(v.getContext(),"Button Clicked",Toast.LENGTH_LONG).show();
            }
        });
        btn.performClick();

但问题是没有发生在按钮上点击的动作，但如果我点击该按钮后，这个动作被执行。

But the problem is that the action on the button click is not happened, but if I click on that button then this action is performed.

我想通过使用code锁定屏幕，但完全执行的onCreate（）方法，

I want to lock the screen by using that code, but it locks after the full execution of onCreate() method,

任何想我怎么能做到这一点。

Any guess how i can do this.

推荐答案

试试这个

final Button backto_main = (Button) findViewById(R.id.back3x3); 
    backto_main.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {                 
            //add your code here..
            WindowManager.LayoutParams params = getWindow().getAttributes();
            params.screenBrightness = 0;
            getWindow().setAttributes(params);
            Toast.makeText(v.getContext(),"Button Clicked",Toast.LENGTH_LONG).show();
        }
    });

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