更新 activity_main.xml
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@@ -7,6 +7,7 @@
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tools:context=".MainActivity">
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<TextView
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android:id="@+id/textView"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="Hello World!"
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@@ -15,4 +16,14 @@
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toTopOf="parent" />
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<Button
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android:id="@+id/myButton"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="Click Me"
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app:layout_constraintTop_toBottomOf="@id/textView"
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app:layout_constraintStart_toStartOf="@id/textView"
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app:layout_constraintEnd_toEndOf="@id/textView" />
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</androidx.constraintlayout.widget.ConstraintLayout>
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