Andorid实现pdf批注、笔记demo

1、兴建andorid项目

2、导入pdf包

implementation ‘com.lonelypluto:pdf-viewer:1.0.5’

1、创建页面和java类

1.1创建OutlineAdapter

package com.example.myapplication.adapter;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.artifex.mupdfdemo.OutlineItem;
import com.example.myapplication.R;

/**
 * @Description: 文件目录adapter
 * @author: ZhangYW
 * @time: 2019/1/22 11:17
 */
public class OutlineAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    private Context mContext;
    private OutlineItem mList[];

    public OutlineAdapter(Context context, OutlineItem mList[]){
        this.mContext = context;
        this.mList = mList;

    }
    /**
     * 渲染具体的ViewHolder
     * @param parent ViewHolder的容器
     * @param viewType 一个标志，我们根据该标志可以实现渲染不同类型的ViewHolder
     * @return
     */
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(mContext).inflate(R.layout.outline_item,parent,false);
        return new OutlineViewHolder(itemView);
    }
    /**
     * 绑定ViewHolder的数据。
     * @param holder
     * @param position 数据源list的下标
     */
    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
        OutlineItem bean = mList[position];
        if (null == bean)
            return;
        OutlineViewHolder viewHolder = (OutlineViewHolder) holder;

        int level = bean.level;
        if (level > 8) level = 8;
        String space = "";
        for (int i=0; i<level;i++)
            space += "   ";
        String text = space + bean.title;

        viewHolder.tv_title.setText(text);
        viewHolder.tv_page.setText(String.valueOf(bean.page+1));
    }

    @Override
    public int getItemCount() {
        return mList.length;
    }
    public static class OutlineViewHolder extends  RecyclerView.ViewHolder{
        public TextView tv_title;
        public TextView tv_page;

        public OutlineViewHolder(View itemView){
            super(itemView);
            tv_title = (TextView) itemView.findViewById(R.id.outline_item_title);
            tv_page = (TextView) itemView.findViewById(R.id.outline_item_page);
        }
    }

}

1.2创建OutlineAdapter的outline_item.xml页面

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:clickable="true"
	android:focusable="true"
	android:background="?selectableItemBackground"
	>

	<TextView
		android:id="@+id/outline_item_title"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
		android:layout_alignParentStart="true"
		android:layout_toStartOf="@+id/outline_item_page"
		android:maxLines="1"
		android:layout_centerVertical="true"
		android:paddingStart="8dp"
		android:text=""
		android:textColor="@color/rv_item_line_tv"
		android:textSize="18sp"
		/>

	<TextView
		android:id="@+id/outline_item_page"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_alignBaseline="@+id/outline_item_title"
		android:layout_alignBottom="@+id/outline_item_title"
		android:layout_alignParentEnd="true"
		android:paddingEnd="8dp"
		android:text=""
		android:textColor="@color/rv_item_line_tv"
		android:textSize="18sp" />

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:layout_below="@+id/outline_item_title"
        android:layout_marginTop="10dp"
        android:background="@color/rv_item_line_bg"
        />
</RelativeLayout>

1.3创建OnRecyclerItemClickListener

package com.example.myapplication.widget;

import android.support.v4.view.GestureDetectorCompat;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;

/**
 * RecyclerView监听事件
 */

public abstract class OnRecyclerItemClickListener implements RecyclerView.OnItemTouchListener {
    private GestureDetectorCompat mGestureDetector;
    private RecyclerView recyclerView;

    public OnRecyclerItemClickListener(RecyclerView recyclerView) {
        this.recyclerView = recyclerView;
        mGestureDetector = new GestureDetectorCompat(recyclerView.getContext(), new ItemTouchHelperGestureListener());
    }

    @Override
    public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
        mGestureDetector.onTouchEvent(e);
        return false;
    }

    @Override
    public void onTouchEvent(RecyclerView rv, MotionEvent e) {
        mGestureDetector.onTouchEvent(e);
    }

    @Override
    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
    }

    private class ItemTouchHelperGestureListener extends GestureDetector.SimpleOnGestureListener {
        @Override
        public boolean onSingleTapUp(MotionEvent e) {
            View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
            if (child != null) {
                RecyclerView.ViewHolder vh = recyclerView.getChildViewHolder(child);
                onItemClick(vh);
            }
            return true;
        }

        @Override
        public void onLongPress(MotionEvent e) {
            View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
            if (child != null) {
                RecyclerView.ViewHolder vh = recyclerView.getChildViewHolder(child);
                onItemLongClick(vh);
            }
        }
    }

    public abstract void onItemClick(RecyclerView.ViewHolder vh);

    public abstract void onItemLongClick(RecyclerView.ViewHolder vh);
}

1.4创建OutlineActivity

package com.example.myapplication.activity;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

import com.artifex.mupdfdemo.OutlineActivityData;
import com.artifex.mupdfdemo.OutlineItem;
import com.example.myapplication.R;
import com.example.myapplication.adapter.OutlineAdapter;
import com.example.myapplication.widget.OnRecyclerItemClickListener;

/**
 * @Description: 目录
 * @author: ZhangYW
 * @time: 2019/3/8 10:29
 */
public class OutlineActivity extends AppCompatActivity {

    private RecyclerView recyclerView;
    private OutlineAdapter adapter;
    private OutlineItem mItems[];
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_outline);

        initData();
        initView();
        setListener();
    }

    /**
     * 初始化数据
     */
    private void initData(){
        mItems = OutlineActivityData.get().items;
    }

    /**
     * 初始化布局
     */
    private void initView(){
        adapter = new OutlineAdapter(this,mItems);
        recyclerView = (RecyclerView)findViewById(R.id.outline_rv);
        recyclerView.setHasFixedSize(true);
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);//HORIZONTAL 水平
        recyclerView.setLayoutManager(linearLayoutManager);
        recyclerView.setAdapter(adapter);
    }

    /**
     * 设置点击事件
     */
    private void setListener(){
        recyclerView.addOnItemTouchListener(new OnRecyclerItemClickListener(recyclerView) {
            @Override
            public void onItemClick(RecyclerView.ViewHolder vh) {
                OutlineActivityData.get().position = vh.getLayoutPosition();
                setResult(mItems[vh.getLayoutPosition()].page);
                finish();
            }

            @Override
            public void onItemLongClick(RecyclerView.ViewHolder vh) {

            }
        });
    }
}

1.5创建OutlineActivity的activity_outline.xml页面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.artifex.mupdfdemo.activity.OutlineActivity">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/outline_rv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />
</LinearLayout>

1.6创建AllPDFActivity

package com.example.myapplication.activity;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ViewAnimator;

import com.artifex.mupdfdemo.Annotation;
import com.artifex.mupdfdemo.Hit;
import com.artifex.mupdfdemo.MuPDFAlert;
import com.artifex.mupdfdemo.MuPDFCore;
import com.artifex.mupdfdemo.MuPDFPageAdapter;
import com.artifex.mupdfdemo.MuPDFReaderView;
import com.artifex.mupdfdemo.MuPDFReaderViewListener;
import com.artifex.mupdfdemo.MuPDFView;
import com.artifex.mupdfdemo.OutlineActivityData;
import com.artifex.mupdfdemo.OutlineItem;
import com.artifex.mupdfdemo.ReaderView;
import com.artifex.mupdfdemo.SavePdf;
import com.artifex.mupdfdemo.SearchTask;
import com.artifex.mupdfdemo.SearchTaskResult;
import com.artifex.mupdfdemo.widget.VDHDeepLayout;
import com.example.myapplication.R;
import com.lonelypluto.pdflibrary.utils.SharedPreferencesUtil;

import java.util.concurrent.Executor;

public class AllPDFActivity extends AppCompatActivity {
    private static final String TAG = AllPDFActivity.class.getSimpleName();
    private final int OUTLINE_REQUEST = 0;
    private String filePath = Environment.getExternalStorageDirectory() + "/pdf_t1.pdf"; // 文件路径
//    private String filePath = Environment.getExternalStorageDirectory() + "/t"; // 文件路径
    private String fileName;// 文件名

    private AlertDialog.Builder mAlertBuilder;
    static private AlertDialog.Builder gAlertBuilder;

    private MuPDFCore muPDFCore;// 加载mupdf.so文件

    private MuPDFReaderView muPDFReaderView;// 显示pdf的view

    private boolean mAlertsActive = false;
    private AsyncTask<Void, Void, MuPDFAlert> mAlertTask;
    private AlertDialog mAlertDialog;

    // tools
    private ViewAnimator mTopBarSwitcher;// 工具栏动画
    private ImageButton mLinkButton;// 超链接
    private ImageButton mOutlineButton;// 目录
    private ImageButton mSearchButton;// 搜索
    private ImageButton mAnnotButton;// 注释
    // tools 搜索框
    private EditText mSearchText;// 搜索内容输入框
    private ImageButton mSearchBack;// 搜索内容上一个
    private ImageButton mSearchFwd;// 搜索内容下一个
    // tools 注释类型
    private TextView mAnnotTypeText;// 注释类型
    // tools 底部布局
    private TextView mPageNumberView;// 页数
    private SeekBar mPageSlider;// 底部拖动条

    private int mPageSliderRes;// 拖动条的个数
    private boolean mButtonsVisible;// 是否显示工具栏
    private TopBarMode mTopBarMode = TopBarMode.Main;// 工具栏类型
    private AcceptMode mAcceptMode;// 工具栏注释类型

    private SearchTask mSearchTask;// 搜索线程
    private boolean mLinkHighlight = false;// 是否高亮显示


    private Button btn_change_hv;// 切换横竖显示
    private boolean ischangeHV = false;// 横竖切换
    private Button btn_linkhighlightcolor;// 设置超链接颜色
    private Button btn_searchtextcolor;// 设置搜索文字颜色
    private Button btn_paintcolor;// 设置画笔颜色
    private Button btn_paintstrokewidth;// 设置画笔粗细

    private Button btn_sign;// 电子签章
    private Button btn_save;// 保存
    private VDHDeepLayout vdhDeepLayout;
    private ImageView iv_sign;

    private ImageView iv_test;

    private SavePdfTask savePdfTask;
    /*
     * 用于存储的异步,并上传更新
     * */
    class SavePdfTask extends AsyncTask {

        SavePdf savePdf;
        public SavePdfTask(SavePdf savePdf) {
            this.savePdf = savePdf;
        }

        @Override
        protected Object doInBackground(Object[] params) {
            savePdf.addText();
            return null;
        }

        @Override
        protected void onPostExecute(Object o) {
            Log.e(TAG, "存储完成");
            try {


            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_all_pdf);

        initView();
    }

    private void initView() {
        SharedPreferencesUtil.init(getApplication());

        muPDFReaderView = (MuPDFReaderView)findViewById(R.id.open_pdf_mupdfreaderview);

        initToolsView();

        mAlertBuilder  = new AlertDialog.Builder(this);
        //  keep a static copy of this that other classes can use
        gAlertBuilder = mAlertBuilder;

        String path = filePath;

        // 通过MuPDFCore打开pdf文件
        muPDFCore = openFile(path);
        // 搜索设为空
        SearchTaskResult.set(null);
        // 判断如果core为空，提示不能打开文件
        if (muPDFCore == null) {
            AlertDialog alert = mAlertBuilder.create();
            alert.setTitle(com.lonelypluto.pdflibrary.R.string.cannot_open_document);
            alert.setButton(AlertDialog.BUTTON_POSITIVE, getString(com.lonelypluto.pdflibrary.R.string.dismiss),
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            finish();
                        }
                    });
            alert.setOnCancelListener(new DialogInterface.OnCancelListener() {

                @Override
                public void onCancel(DialogInterface dialog) {
                    finish();
                }
            });
            alert.show();
            return;
        }

        createUI();

        //切换横竖显示
        btn_change_hv = (Button)findViewById(R.id.btn_change_hv);
        btn_change_hv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (ischangeHV) {
                    muPDFReaderView.setHorizontalScrolling(ischangeHV);
                    btn_change_hv.setText("横");
                    ischangeHV = false;
                } else {
                    muPDFReaderView.setHorizontalScrolling(ischangeHV);
                    btn_change_hv.setText("竖");
                    ischangeHV = true;
                }
            }
        });

        // 改变超链接颜色
        btn_linkhighlightcolor = (Button)findViewById(R.id.btn_linkhighlightcolor);
        btn_linkhighlightcolor.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setLinkHighlightColor(ContextCompat.getColor(AllPDFActivity.this, com.lonelypluto.pdflibrary.R.color.link_bg));
            }
        });

        // 改变搜索文字颜色
        btn_searchtextcolor = (Button)findViewById(R.id.btn_searchtextcolor);
        btn_searchtextcolor.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setSearchTextColor(ContextCompat.getColor(AllPDFActivity.this, com.lonelypluto.pdflibrary.R.color.search_bg));
            }
        });

        // 设置画笔颜色
        btn_paintcolor = (Button)findViewById(R.id.btn_set_paint_color);
        btn_paintcolor.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int c = ContextCompat.getColor(AllPDFActivity.this, com.lonelypluto.pdflibrary.R.color.rv_item_line_bg);
                Log.e(TAG, "color = " + c);
                setColor(c);
                setInkColor(0xFF0000FF);
            }
        });

        // 设置画笔粗细
        btn_paintstrokewidth = (Button)findViewById(R.id.btn_set_paint_strokewidth);
        btn_paintstrokewidth.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setPaintStrockWidth(20.0f);
            }
        });

        // 电子签章
        btn_sign = (Button)findViewById(R.id.btn_sign);
        btn_sign.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.e(TAG, "btn_sign");
                vdhDeepLayout.setVisibility(View.VISIBLE);
            }
        });

        // 保存
        btn_save = (Button)findViewById(R.id.btn_save);
        btn_save.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.e(TAG, "btn_save");
                String in_path = filePath;
                String out_path = in_path.substring(0, in_path.length() - 4) + "_t2.pdf";
                SavePdf savePdf = new SavePdf(in_path, out_path);
                savePdf.setScale(muPDFReaderView.getCurrentScale());
                savePdf.setPageNum(muPDFReaderView.getDisplayedViewIndex() + 1);

                savePdf.setWidthScale(1.0f * muPDFReaderView.getScaleX() / muPDFReaderView.getDisplayedView().getWidth());//计算宽偏移的百分比
                savePdf.setHeightScale(1.0f * muPDFReaderView.getScaleY() / muPDFReaderView.getDisplayedView().getHeight());//计算长偏移的百分比

                Log.e(TAG, "scaleX = " + muPDFReaderView.getScaleX() + "   " + muPDFReaderView.getDisplayedView().getWidth());
                savePdf.setWH(iv_sign.getX(), iv_sign.getY());
//                savePdf.setWidthScale(0);
//                savePdf.setHeightScale(0);

                //计算分辨率密度
                DisplayMetrics metric = new DisplayMetrics();
                getWindowManager().getDefaultDisplay().getMetrics(metric);

                float density = metric.density;
                savePdf.setDensity(density);

                Bitmap bitmap = getBitmap(AllPDFActivity.this, com.lonelypluto.pdflibrary.R.mipmap.ic_launcher);
                savePdf.setBitmap(bitmap);

//                Bitmap bitmap = Bitmap.createBitmap(vdhDeepLayout.getWidth(), vdhDeepLayout.getHeight(),
//                        Bitmap.Config.ARGB_8888);
//                Canvas canvas = new Canvas(bitmap);
//                vdhDeepLayout.draw(canvas);
//                savePdf.setBitmap(bitmap);

                Log.e(TAG, "iv_p = " + iv_sign.getX() + " " + iv_sign.getY());
                Log.e(TAG, "屏幕 = " + vdhDeepLayout.getWidth() + " " + vdhDeepLayout.getHeight());
                savePdfTask = new SavePdfTask(savePdf);
                savePdfTask.execute();
            }
        });

        vdhDeepLayout = (VDHDeepLayout)findViewById(R.id.VDHDeepLayout);
        iv_sign = (ImageView)findViewById(R.id.iv_sign);

        iv_test = (ImageView)findViewById(R.id.iv_test);
    }

    private static Bitmap getBitmap(Context context,int vectorDrawableId) {
        Bitmap bitmap=null;
        if (Build.VERSION.SDK_INT>Build.VERSION_CODES.LOLLIPOP){
            Drawable vectorDrawable = context.getDrawable(vectorDrawableId);
            bitmap = Bitmap.createBitmap(vectorDrawable.getIntrinsicWidth(),
                    vectorDrawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
            Canvas canvas = new Canvas(bitmap);
            vectorDrawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
            vectorDrawable.draw(canvas);
        }else {
            bitmap = BitmapFactory.decodeResource(context.getResources(), vectorDrawableId);
        }
        return bitmap;
    }

    public void setColor(int color) {
        int red = (color & 0xff0000) >> 16;
        int green = (color & 0x00ff00) >> 8;
        int blue = (color & 0x0000ff);
        Log.e(TAG, "r = " + red + " g = " + green + " b = " + blue);
    }

    /**
     * 初始化工具栏
     */
    private void initToolsView() {

        mTopBarSwitcher = (ViewAnimator) findViewById(R.id.switcher);
        mLinkButton = (ImageButton) findViewById(R.id.linkButton);
        mAnnotButton = (ImageButton) findViewById(R.id.reflowButton);
        mOutlineButton = (ImageButton) findViewById(R.id.outlineButton);
        mSearchButton = (ImageButton) findViewById(R.id.searchButton);

        mSearchText = (EditText) findViewById(R.id.searchText);
        mSearchBack = (ImageButton) findViewById(R.id.searchBack);
        mSearchFwd = (ImageButton) findViewById(R.id.searchForward);

        mAnnotTypeText = (TextView) findViewById(R.id.annotType);

        mPageNumberView = (TextView) findViewById(R.id.pageNumber);
        mPageSlider = (SeekBar) findViewById(R.id.pageSlider);

        mTopBarSwitcher.setVisibility(View.INVISIBLE);
        mPageNumberView.setVisibility(View.INVISIBLE);
        mPageSlider.setVisibility(View.INVISIBLE);
    }

    /**
     * 打开文件
     * @param path 文件路径
     * @return
     */
    private MuPDFCore openFile(String path) {
        int lastSlashPos = path.lastIndexOf('/');
        fileName = new String(lastSlashPos == -1
                ? path
                : path.substring(lastSlashPos + 1));
        Log.e(TAG, "filename = " + fileName);
        Log.e(TAG, "Trying to open " + path);
        try {
            muPDFCore = new MuPDFCore(this, path);
            // 新建：删除旧的目录数据
            OutlineActivityData.set(null);
        } catch (Exception e) {
            Log.e(TAG, "openFile catch:" + e.toString());
            return null;
        } catch (OutOfMemoryError e) {
            //  out of memory is not an Exception, so we catch it separately.
            Log.e(TAG, "openFile catch: OutOfMemoryError " + e.toString());
            return null;
        }
        return muPDFCore;
    }

    private void createUI() {
        if (muPDFCore == null)
            return;
        // Set up the page slider
        int smax = Math.max(muPDFCore.countPages() - 1, 1);
        mPageSliderRes = ((10 + smax - 1) / smax) * 2;

        // Now create the UI.
        // First create the document view

        muPDFReaderView.setListener(new MuPDFReaderViewListener() {
            @Override
            public void onMoveToChild(int i) {
                if (muPDFCore == null)
                    return;

                mPageNumberView.setText(String.format("%d / %d", i + 1,
                        muPDFCore.countPages()));
                mPageSlider.setMax((muPDFCore.countPages() - 1) * mPageSliderRes);
                mPageSlider.setProgress(i * mPageSliderRes);
            }

            @Override
            public void onTapMainDocArea() {
                if (!mButtonsVisible) {
                    showButtons();
                } else {
                    if (mTopBarMode == TopBarMode.Main)
                        hideButtons();
                }
            }

            @Override
            public void onDocMotion() {
                hideButtons();
            }

            @Override
            public void onHit(Hit item) {
                switch (mTopBarMode) {
                    case Annot:
                        if (item == Hit.Annotation) {
                            showButtons();
                            mTopBarMode = TopBarMode.Delete;
                            mTopBarSwitcher.setDisplayedChild(mTopBarMode.ordinal());
                        }
                        break;
                    case Delete:
                        mTopBarMode = TopBarMode.Annot;
                        mTopBarSwitcher.setDisplayedChild(mTopBarMode.ordinal());
                        // fall through
                    default:
                        // Not in annotation editing mode, but the pageview will
                        // still select and highlight hit annotations, so
                        // deselect just in case.
                        MuPDFView pageView = (MuPDFView) muPDFReaderView.getDisplayedView();
                        if (pageView != null)
                            pageView.deselectAnnotation();
                        break;
                }
            }
        });

        muPDFReaderView.setAdapter(new MuPDFPageAdapter(this, muPDFCore));
        // 设置view的背景色
        muPDFReaderView.setBackgroundColor(ContextCompat.getColor(this, com.lonelypluto.pdflibrary.R.color.muPDFReaderView_bg));

        mSearchTask = new SearchTask(this, muPDFCore) {
            &