UI组件之复选框CheckBox

xml代码：

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="请选择喜欢的水果："
        android:textSize="23dp"
        />
    <TextView
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"/>
    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/cb_banana"
        android:text="香蕉"/>
    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/cb_apple"
        android:text="苹果"/>
    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/cb_snowPear"
        android:text="雪梨"/>
       
</LinearLayout>
    <Button
        android:id="@+id/btn_Submit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="提交"/>
</LinearLayout>

Activity代码：

public class MainActivity extends AppCompatActivity {

    private CheckBox cbBanana;
    private CheckBox cbApple;
    private CheckBox cbSnowPear;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        cbBanana = findViewById(R.id.cb_banana);
        cbApple = findViewById(R.id.cb_apple);
        cbSnowPear = findViewById(R.id.cb_snowPear);

        Button btnSubmit  = findViewById(R.id.btn_Submit);
        btnSubmit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String text ="";
                if(!cbBanana.isChecked()&&!cbApple.isChecked()&&!cbSnowPear.isChecked()){
                    Toast.makeText(MainActivity.this,"你未进行选择",Toast.LENGTH_LONG).show();
                }
                else {
                    if(cbBanana.isChecked()){
                        text+= cbBanana.getText().toString();
                    }
                    if(cbApple.isChecked()){
                        text+=cbApple.getText().toString();
                    }
                    if(cbSnowPear.isChecked()){
                        text+=cbSnowPear.getText().toString();

                    }
                    Toast.makeText(MainActivity.this,"你选择了"+text,Toast.LENGTH_LONG).show();
                }
            }
        });
    }
}

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