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android 的xml模板标识android, app, tools 分别指的是什么?

` <TextView

    android:id="@+id/textView"
    android:layout_width="400dp"
    android:layout_height="328dp"
    android:layout_marginTop="1dp"
    android:layout_marginBottom="20dp"
    app:layout_constraintBottom_toTopOf="@+id/editText"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.98"
    tools:ignore="MissingConstraints"
    tools:layout_editor_absoluteX="-1dp" />`

例如, 这个textview里面,开始的 android, app, tools 分别代表什么意义呢?


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