Four ways to write click events

1. Implement in xml:
add android:onClick=”button” to the attribute of the button, and then implement it in the code: public void button(View view)

2. Implement by interface:
…implements (1)DialogInterface.OnClickListener (2)View.OnClickListener , the automatically generated methods correspond to public void onClick(DialogInterface dialog, int which) and public void onClick(View v) respectively, the former is A listener for the dialog, which is a listener for the view buttons.

3. Anonymous inner class implementation:

findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

            }
        });

4. Independent class implementation:

onCreate方法里面：
findViewById(R.id.button).setOnClickListener(myOnClick);
onCreate方法外面：
View.OnClickListener myOnClick = new View.OnClickListener() {
        @Override
        public void onClick(View v) {

        }
    };