버튼을 클릭 할 때마다 GridView의 중력을 변경하려고하지만 전개시 응용 프로그램이 중단됩니다. GridView가 XML 레이아웃에서 선언되었을 때 이것이 왜 발생하는지 확신 할 수 없습니다. 널 객체 참조에 ')의 LayoutParams android.widget.GridView.getLayoutParams android.view.ViewGroup $ ('가상 메소드를 호출GridView 중력이 변경되지 않습니다
시도
sw600dp/activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:gravity="center"
android:orientation="vertical"
tools:context=".MainActivity">
<Button
android:id="@+id/btn_moveup"
android:text="move up"
android:background="@android:color/transparent"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:layout_gravity="top"
android:onClick="moveup_click"
/>
<GridView
android:id="@+id/abslistview_main"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:numColumns="auto_fit"
/>
<Button
android:id="@+id/btn_movedown"
android:text="move down"
android:background="@android:color/transparent"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:layout_gravity="bottom"
android:onClick="movedown_click"
/>
</LinearLayout>
MainActivity.java 공용 클래스 MainActivity는 활동 {
를 확장Activity mActivity;
private Button btnUp;
private Button btnDown;
private GridView gridMain;
private AbsListView absListView;
private ArrayAdapter<MainItem> adapter;
private ArrayList<MainItem> mainArrayList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
absListView = findViewById(R.id.abslistview_main);
settingData();
adapter = new AbsListViewAdapter(this, R.layout.item_abslistview, mainArrayList);
absListView.setAdapter(adapter);
}
private void settingData() {
mainArrayList = new ArrayList<>();
mainArrayList.add(new MainItem(R.drawable.ic_circle, getResources().getString(R.string.item_1)));
mainArrayList.add(new MainItem(R.drawable.ic_star, getResources().getString(R.string.item_2)));
mainArrayList.add(new MainItem(R.drawable.ic_square, getResources().getString(R.string.item_3)));
mainArrayList.add(new MainItem(R.drawable.ic_triangle, getResources().getString(R.string.item_4)));
mainArrayList.add(new MainItem(R.drawable.ic_rectangle, getResources().getString(R.string.item_5)));
mainArrayList.add(new MainItem(R.drawable.ic_crescent, getResources().getString(R.string.item_6)));
}
public void moveup_click(View view) {
LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) gridMain.getLayoutParams();
gridMain = findViewById(R.id.abslistview_main);
if (params.gravity == Gravity.BOTTOM) {
gridMain.setGravity(Gravity.CENTER_VERTICAL);
btnDown.setVisibility(View.VISIBLE);
} else if (params.gravity == Gravity.CENTER_VERTICAL) {
gridMain.setGravity(Gravity.TOP);
btnUp.setVisibility(View.GONE);
}
}
}