如何旗活动只有一个实例在Android的？ [英] How to flag only 1 instance of activity in android?

问题描述

在我的Andr​​oid应用程序，我有一个按钮，点击后会打开另一个活动。的问题是，用户能保持迅速该按钮多次攻丝和它将打开很多这些新的活动。我怎么能强迫它，以便只有一个这些活动都可以在同一时间开？

In my android app, I have a button that when clicked opens another activity. The problem is that the user could keep tapping on that button for many times quickly and it would open a lot of those new activities. How can I force it so that only one of those activities can be open at a time?

我想避免办大事像禁用按钮，或将载入画面，

I want to avoid doing big things like disabling buttons or putting loading screens,

推荐答案

如果该情况是因为你描述的那么简单，你可以启动使用的 FLAG_ACTIVITY_SINGLE_TOP 。将prevent新实例被创建，如果有一个已经被证明。粗例如：

If the scenario is as simple as you describe, you can launch the Activity with FLAG_ACTIVITY_SINGLE_TOP. That will prevent new instances from being created if one has already been shown. A crude example:

btn.setOnClickListener(new OnClickListener()
{
    @Override
    public void onClick(View v) {
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                Intent intent = new Intent(MainActivity.this, CalledActivity.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
                startActivity(intent);
            }
        }, 1000);
    }
});

速效pressing上的按钮将创建 CalledActivity 很多情况下没有意图的标志。

Rapid-pressing on the button will create many instances of CalledActivity without the Intent flag.

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