Question

我正在尝试从searchView中删除下界线，但是findViewById方法始终会返回null

@Override
protected void onResume() {
    super.onResume();
    View view = mSearchView.findViewById(android.support.v7.appcompat.R.id.search_plate);
    view.setBackgroundColor(Color.TRANSPARENT);
}

Answer 1

在onCreate

中初始化SearchView

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    searchView = findViewById(R.id.search);
    View v = searchView.findViewById(android.support.v7.appcompat.R.id.search_plate);
    v.setBackgroundColor(Color.TRANSPARENT);

}

布局R.layout.activity_main

   <android.support.v7.widget.SearchView
    android:id="@+id/search"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:layout_marginEnd="8dp"
    android:layout_marginBottom="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

findViewById从searchView返回null

1 个答案: