java 禁用 OnClickListener Android
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Disable OnClickListener Android
提问by Phoenix
I have an OnClickListeneron an image in my app. It allows the user to skip to a different part of the app if desired. The way the app runs, they can only use it 3 times.
OnClickListener我的应用程序中有一个图像。如果需要，它允许用户跳到应用程序的不同部分。该应用程序的运行方式，他们只能使用 3 次。
My issue is, I want to get fancy pants. So I added an R.anim.fade_outanimation to make the image fade out after all 3 times were used. I am using a counter decreased by one in another method.
我的问题是，我想要一条漂亮的裤子。所以我添加了一个R.anim.fade_out动画，使图像在使用 3 次后淡出。我正在使用以另一种方法减一的计数器。
The issue is, when the original method is recalled, it throws a Null Reference Exceptionbecause it can't find the image to set the OnClickListener. I tried wrapping it in an If/Else Ifstatement:
问题是，当调用原始方法时，它抛出 aNull Reference Exception因为它找不到图像来设置OnClickListener. 我试着把它包装在一个If/Else If声明中：
if(skipsAllowed > 0){
skipButton.setOnClickListener(new OnClickListener(){
public void onClick(View v){
if(skipsAllowed > 0){
try {
skippedPage();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
});
}else if(skipsAllowed == 0){
skipFadeOut = AnimationUtils.loadAnimation(null, android.R.anim.fade_out);
skipButton.startAnimation(skipFadeOut);
}
This still didn't work. Any ideas on how to stop this?
这仍然没有奏效。关于如何阻止这种情况的任何想法？
I instantiate the ImageViewat the start of every new call to this Activity, should I be placing that inside my If/ElseIf?
我ImageView在每次新调用 this 时实例化Activity，我应该把它放在我的If/ElseIf 中吗？
回答by msysmilu
Simple: skipButton.setOnClickListener(null)
简单的： skipButton.setOnClickListener(null)
回答by Androiderson
If skipsAllowed == 0unregister onClickListener
如果skipsAllowed == 0注销onClickListener
See Remove an onclick listener
By the way, you should review your code, we usually set a click listeneronly once.
顺便说一句，你应该检查你的代码中，我们通常可以设置一个点击监听，只有一次。
回答by RicardoM
You are getting an exception because you are passing null contextto loadAnimation.
您收到异常，因为您将空上下文传递给loadAnimation.
You can get application context with :
getApplicationContext()
您可以通过以下方式获取应用程序上下文：
getApplicationContext()
And after animation start you should set you button to INVISIBLEto completely hide the skip button.
动画开始后，您应该将按钮设置为INVISIBLE以完全隐藏跳过按钮。
Animation skipFadeOut = AnimationUtils.loadAnimation(getApplicationContext(), android.R.anim.fade_out);
skipButton.startAnimation(skipFadeOut);
skipButton.setVisibility(View.INVISIBLE);
