如何修复此代码中的弃用警告?或者,还有其他的选择吗?
Handler().postDelayed({
context?.let {
//code
}
}, 3000)
如何修复此代码中的弃用警告?或者,还有其他的选择吗?
Handler().postDelayed({
context?.let {
//code
}
}, 3000)
当前回答
如果你使用变量作为处理程序和可运行的,然后像这样使用它。
private Handler handler;
private Runnable runnable;
handler = new Handler(Looper.getMainLooper());
handler.postDelayed(runnable = () -> {
// Do delayed stuff here
handler.postDelayed(runnable, 1000);
}, delay);
你还需要删除onDestroy()中的回调
@Override
public void onDestroy() {
super.onDestroy();
if (handler != null) {
handler.removeCallbacks(runnable);
}
}
其他回答
根据文档(https://developer.android.com/reference/android/os/Handler#Handler()):
Implicitly choosing a Looper during Handler construction can lead to bugs where operations are silently lost (if the Handler is not expecting new tasks and quits), crashes (if a handler is sometimes created on a thread without a Looper active), or race conditions, where the thread a handler is associated with is not what the author anticipated. Instead, use an Executor or specify the Looper explicitly, using Looper#getMainLooper, {link android.view.View#getHandler}, or similar. If the implicit thread local behavior is required for compatibility, use new Handler(Looper.myLooper()) to make it clear to readers.
我们应该停止使用没有Looper的构造函数,而是指定一个Looper。
我通常用这个
代码:
Handler(Looper.myLooper() ?: return).postDelayed({
// Code what do you want
}, 3000)
截图:
我有三个解决方案:
显式地指定Looper: 处理程序(Looper.getMainLooper ()) .postDelayed ({ / /代码 },持续时间) 指定隐式线程本地行为: 处理程序(Looper.myLooper () ! !) .postDelayed ({ / /代码 },持续时间) 使用线程: 线程({ 尝试{ thread . sleep (3000) } catch (e:异常){ 把e } / /代码 }).start ()
Handler()和Handler(Handler.)回调回调)构造函数已弃用。因为这可能会导致bug和崩溃。显式使用Executor或Looper。
对于Java
Handler handler = new Handler(Looper.getMainLooper());
handler.postDelayed(new Runnable() {
@Override
public void run() {
//do your work here
}
}, 1000);
Java的答案
我写了一个容易使用的方法。您可以在项目中直接使用此方法。delayTimeMillis可以是2000,这意味着该代码将在2秒后运行。
private void runJobWithDelay(int delayTimeMillis){
new Handler(Looper.getMainLooper()).postDelayed(new Runnable() {
@Override
public void run() {
//todo: you can call your method what you want.
}
}, delayTimeMillis);
}