CheckBox初识

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效果
这里写图片描述

布局

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_check_box"    android:layout_width="match_parent"    android:orientation="vertical"    android:layout_height="match_parent"    tools:context="com.axnet.buju0711.CheckBoxActivity">    <CheckBox        android:id="@+id/cB1"        android:layout_height="wrap_content"        android:layout_width="wrap_content"        android:text="篮球"        />    <CheckBox        android:id="@+id/cB2"        android:layout_height="wrap_content"        android:layout_width="wrap_content"        android:text="足球"        />    <CheckBox        android:id="@+id/cB3"        android:layout_height="wrap_content"        android:layout_width="wrap_content"        android:text="羽毛球"        />    <CheckBox        android:id="@+id/cB4"        android:layout_height="wrap_content"        android:layout_width="wrap_content"        android:text="冰球"        />    <Button        android:id="@+id/bt1"        android:layout_height="wrap_content"        android:layout_width="match_parent"        android:text="button"        android:textAllCaps="false"        />    <TextView        android:id="@+id/tv1"        android:layout_height="wrap_content"        android:layout_width="wrap_content"        /></LinearLayout>

代码

public class CheckBoxActivity extends AppCompatActivity {    private TextView tv1;    private CheckBox mCheckBox1;    private CheckBox mCheckBox2;    private CheckBox mCheckBox3;    private CheckBox mCheckBox4;    private Button bt1;    //    保存被选中的文本内容    Map<Integer,String>checkItems;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_check_box);        checkItems=new HashMap<>();        tv1=(TextView)findViewById(R.id.tv1);        bt1=(Button)findViewById(R.id.bt1) ;        mCheckBox1=(CheckBox)findViewById(R.id.cB1);        mCheckBox2=(CheckBox)findViewById(R.id.cB2);        mCheckBox3=(CheckBox)findViewById(R.id.cB3);        mCheckBox4=(CheckBox)findViewById(R.id.cB4);        mCheckBox1.setOnCheckedChangeListener(MyListener);        mCheckBox2.setOnCheckedChangeListener(MyListener);        mCheckBox3.setOnCheckedChangeListener(MyListener);        mCheckBox4.setOnCheckedChangeListener(MyListener);        bt1.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //遍历集合                String items="";                for(Integer key:checkItems.keySet()){                    //拼接字符串                    items+=checkItems.get(key);                }                tv1.setText(items);            }        });    }    CompoundButton.OnCheckedChangeListener MyListener=new CompoundButton.OnCheckedChangeListener() {        @Override        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {            if(isChecked==true){                //保存键值对                checkItems.put(buttonView.getId(),buttonView.getText().toString() );            }else if(isChecked==false){                checkItems.remove(buttonView.getId());            }        }    };}

重点内容
创建集合存储数据

    Map<Integer,String>checkItems;    checkItems=new HashMap<>();

 CompoundButton.OnCheckedChangeListener MyListener=new CompoundButton.OnCheckedChangeListener() {        @Override        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {            if(isChecked==true){                //保存键值对                checkItems.put(buttonView.getId(),buttonView.getText().toString() );            }else if(isChecked==false){                checkItems.remove(buttonView.getId());            }        }    };

   bt1.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //遍历集合                String items="";                for(Integer key:checkItems.keySet()){                    //拼接字符串                    items+=checkItems.get(key);                }                tv1.setText(items);            }        });

自定义一个匿名内部类

  CompoundButton.OnCheckedChangeListener MyListener=new CompoundButton.OnCheckedChangeListener() {        @Override        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {            if(isChecked==true){                //保存键值对                checkItems.put(buttonView.getId(),buttonView.getText().toString() );            }else if(isChecked==false){                checkItems.remove(buttonView.getId());            }        }    };

剩下几个checkBox复用这个内部类

 mCheckBox1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {                if(isChecked==true){                    //保存键值对                    checkItems.put(buttonView.getId(),buttonView.getText().toString() );                }else if(isChecked==false){                    checkItems.remove(buttonView.getId());                }            }        });        mCheckBox2.setOnCheckedChangeListener(MyListener);        mCheckBox3.setOnCheckedChangeListener(MyListener);        mCheckBox4.setOnCheckedChangeListener(MyListener);

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