android widget 之CheckBox

CheckBox 是一种多选按钮，用户可以在一组选项中选择多个。CheckBox也是Android中最常用的组件。

 

<?xml version = "1.0" encoding = "utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent">

    <TextView android:text = "你希望能够做你的红颜知己的女人："

         android:layout_width="fill_parent"

         android:layout_height="wrap_content"/>

    <CheckBox android:text="杨贵妃" android:id="@+id/checkbox1"

         android:layout_width="fill_parent"

         android:layout_height="wrap_content"/>

    <CheckBox android:text="貂蝉" android:id="@+id/checkbox2"

         android:layout_width="fill_parent"

         android:layout_height="wrap_content"/>

    <CheckBox android:text="西施" android:id="@+id/checkbox3"

         android:layout_width="fill_parent"

         android:layout_height="wrap_content"/>

    <CheckBox android:text="王昭君" android:id="@+id/checkbox4"

         android:layout_width="fill_parent"

         android:layout_height="wrap_content"/>

    <Button android:id="@+id/btnGetCheckValue"

         android:layout_width="fill_parent"

         android:layout_height="wrap_content"

         android:text="获取选择的值"/>

</LinearLayout>

 

 

CheckBox 通过isChecked方法来确定是否选中。

 

CheckBox 支持OnClickListener 以及OnCheckedChangeListener:

 

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.checkbox);

       

        final CheckBox cb1 = (CheckBox)findViewById(R.id.checkbox1);

        final CheckBox cb2 = (CheckBox)findViewById(R.id.checkbox2);

        final CheckBox cb3 = (CheckBox)findViewById(R.id.checkbox3);

        final CheckBox cb4 = (CheckBox)findViewById(R.id.checkbox4);

        final CheckBox[] cbs= new CheckBox[]{cb1,cb2,cb3,cb4};

        Button btnGetCheckValue = (Button)findViewById(R.id.btnGetCheckValue);

        btnGetCheckValue.setOnClickListener(new View.OnClickListener() {

           

            public void onClick(View v) {

                String text = "你选择的红颜知己有：";

                for(CheckBox cb : cbs){

                    if(cb.isChecked()){

                        text += cb.getText()+",";

                    }

                }

                setTitle(text);

            }

        });

        for(final CheckBox cb: cbs){

            cb.setOnClickListener(new View.OnClickListener() {

                public void onClick(View v) {

                    System.out.println(cb.getText());

                }

            });

            cb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

                    if(isChecked){

                        setTitle("你选了" +cb.getText());

                        Toast.makeText(getApplicationContext(), "you selected "+buttonView.getText().toString(), Toast.LENGTH_SHORT).show();

 

                    }

                }

            });

        }

    }