Android 的CompoundButton（抽象类按钮）、StringBuffer（字符串变量）「建议收藏」

public class MainActivity extends AppCompatActivity { 
   
//1.定义不同类型的变量
    public CheckBox chb1, chb2, chb3, chb4, chb5, chb6, chb7, chb8, chb9, chb10, chb11;
    public Button btn1;
    public StringBuffer buffer;   //注意：buffer变量为StringBuffer类型（它的初始化方法也不同，下面会有注释）
    @Override
    protected void onCreate(Bundle savedInstanceState) { 
   
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //2.获取CheckBox控件
        chb1 = findViewById(R.id.chb1);
        chb2 = findViewById(R.id.chb2);
        chb3 = findViewById(R.id.chb3);
        chb4 = findViewById(R.id.chb4);
        chb5 = findViewById(R.id.chb5);
        chb6 = findViewById(R.id.chb6);
        chb7 = findViewById(R.id.chb7);
        chb8 = findViewById(R.id.chb8);
        chb9 = findViewById(R.id.chb9);
        chb10 = findViewById(R.id.chb10);
        chb11 = findViewById(R.id.chb11);
        //添加CompoundButton的“勾选状态变化监听器”（OnCheckedChangeListener），其中listener为监听器名称
        CompoundButton.OnCheckedChangeListener listener = new CompoundButton.OnCheckedChangeListener() { 
   
            @Override
            //监听器的onCheckedChanged事件
            public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) { 
   
                buffer = new StringBuffer();                //初始化buffer字符串变量
                if (chb1.isChecked()){ 
                         //如果chb1被选中
     //获取chb1的Text，利用 buffer的append方法，将字符串追加到 buffer变量中去，以下的判断逻辑，于此相同，不再赘述。
                   buffer.append(chb1.getText().toString()+" "); 
                }
                if (chb2.isChecked()){ 
   
                    buffer.append(chb2.getText().toString()+" ");
                }
                if (chb3.isChecked()){ 
   
                    buffer.append(chb3.getText().toString()+" ");
                }
                if (chb4.isChecked()){ 
   
                    buffer.append(chb4.getText().toString()+" ");
                }
                if (chb5.isChecked()){ 
   
                    buffer.append(chb5.getText().toString()+" ");
                }
                if (chb6.isChecked()){ 
   
                    buffer.append(chb6.getText().toString()+" ");
                }
                if (chb7.isChecked()){ 
   
                    buffer.append(chb7.getText().toString()+" ");
                }
                if (chb8.isChecked()){ 
   
                    buffer.append(chb8.getText().toString()+" ");
                }
                if (chb9.isChecked()){ 
   
                    buffer.append(chb9.getText().toString()+" ");
                }
                if (chb10.isChecked()){ 
   
                    buffer.append(chb10.getText().toString()+" ");
                }
                if (chb11.isChecked()){ 
   
                    buffer.append(chb11.getText().toString()+" ");
                }
                Toast.makeText(MainActivity.this, "您选中的是：" + buffer, Toast.LENGTH_SHORT).show();
            }
        };
        //为其余CheckBox的setOnCheckedChangeListener监视器设置相同的监听器名称(listener)，以实现抽象类按钮CompoundButton对其的监听。
        chb1.setOnCheckedChangeListener(listener);
        chb2.setOnCheckedChangeListener(listener);
        chb3.setOnCheckedChangeListener(listener);
        chb4.setOnCheckedChangeListener(listener);
        chb5.setOnCheckedChangeListener(listener);
        chb6.setOnCheckedChangeListener(listener);
        chb7.setOnCheckedChangeListener(listener);
        chb8.setOnCheckedChangeListener(listener);
        chb9.setOnCheckedChangeListener(listener);
        chb10.setOnCheckedChangeListener(listener);
        chb11.setOnCheckedChangeListener(listener);
    }
}