BringToFront在协调器布局中不起作用

bringToFront()为我工作android.support.design.widget.CoordinatorLayout.我的环境:

Android Studio 1.5.1

设备:摩托罗拉与Android 4.1.2(API 16)

activity_main.xml中:

MainActivity.java:

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

    TextView textView = (TextView) findViewById(R.id.textView);
    textView.bringToFront();
}

以下是截图:

同 textView.bringToFront();

没有 textView.bringToFront();

   /**
     * Change the view's z order in the tree, so it's on top of other sibling
     * views. This ordering change may affect layout, if the parent container
     * uses an order-dependent layout scheme (e.g., LinearLayout). Prior
     * to {@link android.os.Build.VERSION_CODES#KITKAT} this
     * method should be followed by calls to {@link #requestLayout()} and
     * {@link View#invalidate()} on the view's parent to force the parent to redraw
     * with the new child ordering.
     *
     * @see ViewGroup#bringChildToFront(View)
     */
    public void bringToFront() {
        if (mParent != null) {
            mParent.bringChildToFront(this);
        }
    }

根据这个你可能会错过这一行:

((View)myView.getParent()).requestLayout();

它会工作,检查出来.!

在KITKAT之前,此方法之后应该在视图的父级上调用requestLayout()和invalidate(),以强制父级使用新的子级排序重绘.

必须在视图的父级上调用这些方法.您在视图本身上调用它们.

这应该工作.

tvLevel.bringToFront();
tvLevel.getParent().requestLayout();
tvLevel.getParent().invalidate();

bringToFront()为我工作android.support.design.widget.CoordinatorLayout.我的环境:

Android Studio 1.5.1

设备:摩托罗拉与Android 4.1.2(API 16)

activity_main.xml中:

MainActivity.java:

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

    TextView textView = (TextView) findViewById(R.id.textView);
    textView.bringToFront();
}

以下是截图:

同 textView.bringToFront();

没有 textView.bringToFront();