public?class?MainActivity?extends?Activity?implements?View.OnClickListener?{ ????private?Button?button; ????private?TextView?tv; ????@Override ????protected?void?onCreate(Bundle?savedInstanceState)?{ ????????super.onCreate(savedInstanceState); ????????setContentView(R.layout.activity_main); ????????button?=?(Button)findViewById(R.id.button); ????????tv?=?(TextView)findViewById(R.id.textView); ????????button.setOnClickListener(this); ????} ?????@Override ????public?void?onClick(View?v)?{ ????????int?vi?=?tv.getVisibility(); ????????if(vi?!=0) ????????{ ????????????tv.setVisibility(0); ????????} ????????else ????????????tv.setVisibility(4); ????} } public?class?MainActivity?extends?Activity{ ?private?Button?button; ????private?TextView?tv; ????@Override ????protected?void?onCreate(Bundle?savedInstanceState)?{ ????????super.onCreate(savedInstanceState); ????????setContentView(R.layout.activity_main); ????????button?=?(Button)findViewById(R.id.button); ????????tv?=?(TextView)findViewById(R.id.textView); ????????button.setOnClickListener(new?View.OnClickListener()?{ ????????????@Override ????????????public?void?onClick(View?v)?{ ????????????????int?vi?=?tv.getVisibility(); ????????????????if(vi?!=0) ????????????????{ ????????????????????tv.setVisibility(0); ????????????????} ????????????????else ????????????????????tv.setVisibility(4); ????????????} ????????}) ????} }前者是外部類監(jiān)聽， 后者是匿名內(nèi)部類嘛？