3.26

CheckBox(复选框)：

复选框，即可以同时选中多个选项，至于获得选中的值，同样有两种方式： 1.为每个CheckBox添加事件：setOnCheckedChangeListener 2.弄一个按钮，在点击后，对每个checkbox进行判断:isChecked()；

代码示例：

public class MainActivity extends AppCompatActivity implements View.OnClickListener,CompoundButton.OnCheckedChangeListener{

    private CheckBox cb_one;
    private CheckBox cb_two;
    private CheckBox cb_three;
    private Button btn_send;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        cb_one = (CheckBox) findViewById(R.id.cb_one);
        cb_two = (CheckBox) findViewById(R.id.cb_two);
        cb_three = (CheckBox) findViewById(R.id.cb_three);
        btn_send = (Button) findViewById(R.id.btn_send);

        cb_one.setOnCheckedChangeListener(this);
        cb_two.setOnCheckedChangeListener(this);
        cb_three.setOnCheckedChangeListener(this);
        btn_send.setOnClickListener(this);

    }

    @Override
    public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
       if(compoundButton.isChecked()) Toast.makeText(this,compoundButton.getText().toString(),Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onClick(View view) {
        String choose = "";
        if(cb_one.isChecked())choose += cb_one.getText().toString() + "";
        if(cb_two.isChecked())choose += cb_two.getText().toString() + "";
        if(cb_three.isChecked())choose += cb_three.getText().toString() + "";
        Toast.makeText(this,choose,Toast.LENGTH_SHORT).show();
    }
}