Android系统。(Android. Change margin of LinearLayout on runtime)

我试图通过使用接口和以下代码修改它的边距来移动LinearLayout视图：

@Override public void onListScroll(int offset) { tabBarOffset += offset; if (tabBarOffset < 0) tabBarOffset = 0; if (tabBarOffset > 50) tabBarOffset = 50; View tabBar = findViewById(R.id.movingTabBar); ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) tabBar.getLayoutParams(); params.topMargin = tabBarOffset; }

代码适用于第一次调用 - 创建活动时。但是，只要在之后调用代码块，就不会发生视图中的任何更改。我可以确认margin参数被多次改变，因为有三个事实：1）代码在启动时工作2）记录marginTop值总是给出新值（它正在改变）3）在层次结构视图中我可以看到新的保证金价值

所以我想我只需要调用一些方法来更新视图本身？让它重绘？或者我可能需要在UI线程上调用一些代码？因为此代码是从接口回调运行的。

I am trying to move a LinearLayout view by modifying it's margins using an interface and following code:

the code works with the first call -- when the activity is created. But whenever the code block is called after, no changes in the view are being happened. I can confirm that the margin parameter is trully being changed, because of three facts : 1) the code works on start up 2) logging the marginTop value always gives new values ( it is being changed) 3) in the Hierarchy View i could see the new margin value

so i am thinking i just have to call some method to update the view itself? to make it redraw? or may be i have to call some code on the UI thread? because this code is being run from interface callback.

最满意答案

试试这个：

@Override public void onListScroll(final int offset) { new Handler(Looper.getMainLooper()).post(new Runnable() { @Override public void run() { tabBarOffset += offset; if (tabBarOffset < 0) tabBarOffset = 0; if (tabBarOffset > 50) tabBarOffset = 50; ViewGroup tabBar = findViewById(R.id.movingTabBar); ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) tabBar.getLayoutParams(); params.topMargin = tabBarOffset; tabBar.requestLayout(); } }); }

try this:

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