Question

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();

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.

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

Any guess how i can do this.

Answer 1

try this

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();
        }
    });