使用getPrimaryClip()复制数据给定{text/plain {NULL}} [英] Copying data giving using getPrimaryClip() giving { text/plain {NULL} }

问题描述

使用ClipData时得到{ text/plain {NULL} }，但是如果使用不推荐使用的方法mClipboard.getText()，则效果很好.

I am getting { text/plain {NULL} } when I am using ClipData but if I use deprecated method mClipboard.getText() it is working just fine.

if (mClipboard.getPrimaryClipDescription().hasMimeType(ClipDescription.MIMETYPE_TEXT_PLAIN)) {
    ClipData clipData = mClipboard.getPrimaryClip();
    ClipData.Item item = clipData.getItemAt(0);
    Log.d(TAG, clipData.toString());
    Log.d(TAG, mClipboard.getText());
}

更新

问题存在于三星银河标签3中.

Issue exists in Samsung galaxy Tab 3.

推荐答案

未知的原因.因为它可以在我测试过的设备(S6 5.0)上运行.您可能需要查看不推荐使用的getText()方法的实现:

The reason of your problem is unknown. since it works on a device which I tested on (S6 5.0). You may want to look at the implementation of deprecated getText() method:

public CharSequence getText() {
    ClipData clip = getPrimaryClip();
    if (clip != null && clip.getItemCount() > 0) {
        return clip.getItemAt(0).coerceToText(mContext);
    }
    return null;
}

为了获取文本，它使用coerceToText()方法.根据此方法的说明:

In order to obtain the text It uses the method coerceToText() . according to description of this method:

     * Turn this item into text, regardless of the type of data it
     * actually contains.

因此，我认为不赞成使用getText()方法是出于性能方面的考虑或其他原因.

Therefore , I presume the deprecation of method getText() is due to a performance concern or something else.

无论如何.由于方法getText()使用未弃用的API，因此，作为解决方法，如果调用推荐的API返回null，则可以使用此方法的某些部分的源(特别是方法coerceToText()):

Anyway. Since method getText() uses API which is not deprecated, as a workaround you can use some part of the source of this method(specifically, method coerceToText() ) if calling recommended API returns null:

ClipboardManager mclipboard =(ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
boolean isTextPlain = mclipboard.getPrimaryClip().getDescription().hasMimeType(ClipDescription.MIMETYPE_TEXT_PLAIN);
    CharSequence text = null;
if (isTextPlain){
    ClipData clipData = mclipboard.getPrimaryClip();
    ClipData.Item item = clipData.getItemAt(0);
    if (  item!= null ){
        text = item.getText();
        if (text == null){
            // taken from source of clipData.getText() method
            text =  item.coerceToText(this);
        }
    }
}

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