protected?void?onCreate(Bundle?savedInstanceState)?{ ????super.onCreate(savedInstanceState); ????setContentView(R.layout.secondactivity); ????read?=?(CheckBox)?findViewById(R.id.read); ????sport?=?(CheckBox)?findViewById(R.id.sport); ????think?=?(CheckBox)?findViewById(R.id.think); ????MyCheckBox?myCheckBox?=?new?MyCheckBox(); ????read.setOnCheckedChangeListener(myCheckBox); ????sport.setOnCheckedChangeListener(myCheckBox); ????think.setOnCheckedChangeListener(myCheckBox); } class?MyCheckBox?implements?CompoundButton.OnCheckedChangeListener{ ????@Override ????public?void?onCheckedChanged(CompoundButton?compoundButton,?boolean?b)?{ ????????CheckBox?checkBox?=?(CheckBox)?compoundButton; ????????switch?(checkBox.getId()){ ????????????case?R.id.read: ????????????????Toast.makeText(MainActivity.this,"你選擇了讀書選項"+b,Toast.LENGTH_SHORT).show(); ????????????case?R.id.sport: ????????????????Toast.makeText(MainActivity.this,"你選擇了運動選項"+b,Toast.LENGTH_SHORT).show(); ????????????case?R.id.think: ????????????????Toast.makeText(MainActivity.this,?"你選擇了發呆選項"+b,?Toast.LENGTH_SHORT).show(); ????????} ????} }3個checkbox，添加了checkedchang事件。我發現，case里面，沒有添加break的情況下第一個read被點擊了，會依次彈出 “你選擇了讀書選項true“+”你選擇了運動選項true”+“你選擇了發呆選true”而點第二個sport，則會彈出”你選擇了運動選項true”+“你選擇了發呆選true”點最后一個think則只彈出一個“你選擇了發呆選true”相當于，點擊前面的按鈕，則后面全都會彈出來出來，這是為什么？