二维码-clipboard的使用

说明

原生的二维码使用了clipboard的功能.

代码ClipboardInterface.java

/* * Copyright (C) 2012 ZXing authors * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package com.google.zxing.client.android.clipboard;import android.content.ClipData;import android.content.ClipboardManager;import android.content.Context;import android.util.Log;/** * Abstraction over the {@link ClipboardManager} API that manages copying and pasting. */public final class ClipboardInterface {    private static final String TAG = ClipboardInterface.class.getSimpleName();    private ClipboardInterface() {    }    public static CharSequence getText(Context context) {        ClipboardManager clipboard = getManager(context);        ClipData clip = clipboard.getPrimaryClip();        return hasText(context) ? clip.getItemAt(0).coerceToText(context) : null;    }    public static void setText(CharSequence text, Context context) {        if (text != null) {            try {                getManager(context).setPrimaryClip(ClipData.newPlainText(null, text));            } catch (NullPointerException | IllegalStateException e) {                // Have seen this in the wild, bizarrely                Log.w(TAG, "Clipboard bug", e);            }        }    }    public static boolean hasText(Context context) {        ClipboardManager clipboard = getManager(context);        ClipData clip = clipboard.getPrimaryClip();        return clip != null && clip.getItemCount() > 0;    }    private static ClipboardManager getManager(Context context) {        return (ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);    }}