Android 自定义 ViewGroup

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public class Workspace extends ViewGroup {
	// 省略了构造方法
	@Override
	protected 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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public class MainActivity extends Activity{
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.workspace);
	}
}

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