ClipboardManager OnPrimaryClipChangedListener被称为两次每个副本 [英] ClipboardManager OnPrimaryClipChangedListener is called twice for every copy

问题描述

当我将文本复制到剪贴板onPrimaryClipChanged方法被调用了两次。任何想法，为什么？

When I copy text to the clipboard onPrimaryClipChanged method is called twice. Any ideas why?

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main, menu);
    final ClipboardManager cliboardManager = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);

    cliboardManager
            .addPrimaryClipChangedListener(new OnPrimaryClipChangedListener() {

                @Override
                public void onPrimaryClipChanged() {
                    ClipData clipData = cliboardManager.getPrimaryClip();
                    System.out
                            .println("********** clip changed, clipData: "
                                    + clipData.getItemAt(0));
                }
            });
    return true;
}

测试案例： 复制从英国广播公司网站上的文字继续将导致以下输出：

Test case: Copying the text "continue" from the BBC web site will result in the following output:

继续

继续

但是，如果我调试程序我可以看到clipData对象值：

But if I debug the program I can see that the clipData object has value:

ClipData {text / plain的【T：继续}}

ClipData { text/plain {T:continue } }

第一次onPrimaryClipChanged（）被调用以及

the first time onPrimaryClipChanged() is called and

ClipData {text / plain的英国广播公司 - 首页{T：继续}}

ClipData { text/plain "BBC - Homepage" {T:continue } }

onPrimaryClipChanged在下一次（）被调用。

the next time onPrimaryClipChanged() is called.

所以基本上在第一时间ClipDesc​​ription是{text / plain的}，第二次是ClipDesc​​ription {text / plain的英国广播公司 - 主页}（即包括网页的标题）

So basically the first time ClipDescription is { text/plain } and the second time is ClipDescription { text/plain "BBC - Homepage" } (i.e including the title of the web page)

推荐答案

我想你没有注册多个监听器，我不能说这是错误，你仍然可以变通办法。尝试是这样的：

I assume you didn't register multiple listeners, I can't say it is bug, you still you can workaround it. Try something like this:

   String mPreviousText = "";

   cliboardManager
                .addPrimaryClipChangedListener(new OnPrimaryClipChangedListener() {

                    @Override
                    public void onPrimaryClipChanged() {
                        ClipData clipData = cliboardManager.getPrimaryClip();
                        System.out
                                .println("********** clip changed, clipData: "
                                        + clipData.getItemAt(0));
                         ClipData.Item item = clipData.getItemAt(0);
                         if(mPreviousText.equals(item.getText()) return;
                         else{
                            /// do something
                            mPrevousText = item.getText();
                         }
                    }
                });

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