[Android] CheckBox 勾選按鈕

CheckBox checkBox;

checkBox=(CheckBox)findViewById(R.id.checkBox);
checkBox.setOnCheckedChangeListener(this);

示範

XML

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
    tools:context=".MainActivity">

    <CheckBox
        android:id="@+id/checkBox"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:text="CheckBox"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/t1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>

JAVA

public class MainActivity extends AppCompatActivity implements CompoundButton.OnCheckedChangeListener {
CheckBox checkBox;
TextView t1;
    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        t1=(TextView)findViewById(R.id.t1);
checkBox=(CheckBox)findViewById(R.id.checkBox);
checkBox.setOnCheckedChangeListener(this);

    }

    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if(checkBox.isChecked()==true){
            t1.setText("True");
        }
        if(checkBox.isChecked()==false){
            t1.setText("False");
        }
    }
}