Android 自定义 ViewGroup

Android  /  houtizong 发布于 3年前   109

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public class Workspace extends ViewGroup {// 省略了构造方法@Overrideprotected void onLayout(boolean changed, int l, int t, int r, int b) {int childLeft = 0;final int count = getChildCount();for (int i = 0; i < count; i++) {final View child = getChildAt(i);if (child.getVisibility() != View.GONE) {final int childWidth = child.getMeasuredWidth();child.setVisibility(View.VISIBLE);child.measure(r - l, b - t); // 这个调用必须有，网上很多文章没有这个调用导致子控件始终无法显示。child.layout(childLeft, 0, childLeft + childWidth, child.getMeasuredHeight());childLeft += childWidth;}}}}

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<huadi.workspacedemo.Workspacexmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/workspace"android:layout_width="fill_parent"android:layout_height="fill_parent"android:scrollbars="horizontal"android:fadeScrollbars="true"><include android:id="@+id/cell1" layout="@layout/img_view" /><include android:id="@+id/cell2" layout="@layout/img_view" /></huadi.workspacedemo.Workspace>

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public class MainActivity extends Activity{@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.workspace);}}

有时间后编辑