Android文档预览

package com.damaiaolai.mall.activity.add;

import android.app.DownloadManager;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.os.Environment;
import android.os.Handler;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import com.blankj.utilcode.util.SPStaticUtils;
import com.blankj.utilcode.util.ScreenUtils;
import com.damaiaolai.mall.R;
import com.damaiaolai.mall.utils.HnUserUtil;
import com.damaiaolai.mall.utils.UploadDownloadUtils;
import com.facebook.common.time.CurrentThreadTimeClock;
import com.hn.library.base.BaseActivity;
import com.hn.library.http.UploadFileResponseModel;
import com.tencent.mm.opensdk.utils.Log;
import com.tencent.smtt.sdk.WebView;
import com.tencent.smtt.sdk.WebViewClient;
import com.ycbjie.webviewlib.FileReaderView;
import com.ycbjie.webviewlib.X5WebView;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class FileShowActivity extends BaseActivity {


    @BindView(R.id.web_view)
    X5WebView webView;
    @BindView(R.id.share)
    ImageView share;
    @BindView(R.id.file_show_img)
    ImageView fileShowImg;
    @BindView(R.id.file_show_filename)
    TextView fileShowFilename;
    @BindView(R.id.filereaderview)
    FileReaderView filereaderview;

    @Override
    public int getContentViewId() {
        return R.layout.activity_file_show;
    }


    @Override
    public void onCreateNew(Bundle savedInstanceState) {

        setShowTitleBar(false);
        fileShowImg.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                finish();
            }
        });
        final String filename = SPStaticUtils.getString("filename");
        final String fileName = SPStaticUtils.getString("fileName");
        fileShowFilename.setText(fileName);
        Log.d("TAG",fileName+"============="+filename);
        final String absolutePath = getFilesDir().getAbsolutePath();
        new Thread(new Runnable() {
            @Override
            public void run() {
                UploadDownloadUtils.getInstance().deleteFile(absolutePath);
                UploadDownloadUtils.getInstance().downloadDocument(absolutePath,fileName,filename);
            }
        }).start();
        new CountDownTimer(1000,1000){
            @Override
            public void onTick(long l) {

            }
            @Override
            public void onFinish() {
                List<String> localPic = UploadDownloadUtils.getLocalPic(absolutePath);
                Log.d("file====",localPic.toString());
                String s = localPic.get(0);
                filereaderview.show(s);
            }
        }.start();
        
/*        //webView.loadUrl(filename);                    //加载web资源
//webView.loadUrl("file:///android_asset/example.html");       //加载本地资源
//这个时候发现一个问题，启动应用后，自动的打开了系统内置的浏览器，解决这个问题需要为webview设置 WebViewClient，并重写方法：
        webView.setWebViewClient(new WebViewClient() {
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
                //返回值是true的时候控制去WebView打开，为false调用系统浏览器或第三方浏览器
                return true;
            }
            //还可以重写其他的方法
        });*/

        share.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent textIntent = new Intent(Intent.ACTION_SEND);
                textIntent.setType("text/plain");
                textIntent.putExtra(Intent.EXTRA_TEXT, fileName + "\n" + filename);
                startActivity(Intent.createChooser(textIntent, "分享"));
            }
        });
    }


    @Override
    public void getInitData() {

    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // TODO: add setContentView(...) invocation
        ButterKnife.bind(this);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        filereaderview.stop();

    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".activity.add.FileShowActivity">
    <RelativeLayout
        android:layout_width="match_parent"
        android:background="@color/white"
        android:layout_height="wrap_content">
        <ImageView
            android:id="@+id/file_show_img"
            android:layout_width="22dp"
            android:layout_height="22dp"
            android:src="@drawable/back_k"
            android:layout_marginTop="13dp"
            android:layout_marginLeft="20dp"
            />

        <TextView
            android:id="@+id/file_show_filename"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="文件名字"
            android:gravity="center"
            android:textColor="@color/black"
            android:textSize="17sp"
            android:layout_marginTop="9dp"
            android:layout_marginBottom="20dp"
            />

        <ImageView
            android:layout_width="25dp"
            android:layout_height="25dp"
            android:src="@drawable/goods_details_share"
            android:id="@+id/share"
            android:layout_alignParentRight="true"
            android:layout_marginRight="20dp"
            android:textColor="@color/black"
            android:layout_marginTop="11dp"
            />

    </RelativeLayout>

    <com.ycbjie.webviewlib.FileReaderView
        android:id="@+id/filereaderview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
    <com.ycbjie.webviewlib.X5WebView
        android:id="@+id/web_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="gone"
        android:scrollbarSize="3dp" />


</LinearLayout>

UploadDownloadUtils下载工具类如下：

package com.damaiaolai.mall.utils;

import android.annotation.SuppressLint;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.util.Log;

import com.blankj.utilcode.util.LogUtils;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import io.reactivex.annotations.NonNull;
import okhttp3.Call;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.ResponseBody;

/**
 * Create by JiYaRuo on 2021/8/20.
 * Describe:
 */
public class UploadDownloadUtils {
    private static final String TAG = UploadDownloadUtils.class.getSimpleName();
    private static UploadDownloadUtils mInstance;
    public final static String DOCUMENT_PATH = Environment.getExternalStorageDirectory() + "/RecorderGuide/";

    private OnImageLoadListener mOnImageLoadListener;

    public UploadDownloadUtils() {
    }

    public void set0nImageLoadListener(OnImageLoadListener mOnImageLoadListener) {
        this.mOnImageLoadListener = mOnImageLoadListener;
    }

    public interface OnImageLoadListener {
        void onFileDownload(int type, float position, String filePath);
    }

    public static UploadDownloadUtils getInstance() {
        if (mInstance == null) {
            synchronized (UploadDownloadUtils.class) {
                if (mInstance == null) {
                    mInstance = new UploadDownloadUtils();
                }
            }
        }
        return mInstance;
    }

    /**
     * 下载文件
     *
     * @param path     下载路径
     * @param fileName 文件命名（加后缀名）
     * @param url      文件的url
     */
    public void downloadDocument(final String path, final String fileName, final String url) {
        new Thread(new Runnable() {
            @SuppressLint("NewApi")
            @Override
            public void run() {
                try {
                    OkHttpClient client = new OkHttpClient();
                    Request request = new Request
                            .Builder()
                            .url(url)//要访问的链接
                            .get()
                            .build();
                    Call call = client.newCall(request);
                    Response execute = call.execute();
                    //获取下载的内容输入流
                    ResponseBody body = execute.body();
                    InputStream inputStream = body.byteStream();
                    final long lengh = body.contentLength();
//                    LogUtils.i(TAG,"downloadDocument","文件大小=="+lengh);
                    // 文件保存到本地
                    File file1 = null;
                    file1 = new File(path);
                    if (!file1.exists())
                        file1.mkdirs();
//                    LogUtils.i(TAG,"downloadDocument","文件名称=="+fileName);
                    File file = new File(file1, fileName);
                    if (!file.exists()) {
                        file.createNewFile();
                    }
                    FileOutputStream outputStream = new FileOutputStream(file);
                    int lien = 0;
                    int losing = 0;
                    byte[] bytes = new byte[1024];
                    while ((lien = inputStream.read(bytes)) != -1) {
                        outputStream.write(bytes, 0, lien);
                        losing += lien;
                        final float i = losing * 1.0f / lengh;
                        if (i == 1.0) {
                            LogUtils.i(TAG, "downloadDocument", "下载完成" + fileName);
                            //Log.d("TAG","downloadDocument  下载完成"+fileName);
                        } else {
//                            LogUtils.i(TAG,"downloadDocument","下载进度=="+i);
                        }
                        Message message = mHandler.obtainMessage();
                        message.obj = i;
                        message.what = 6;
                        mHandler.sendMessage(message);
                    }
                    outputStream.flush();
                    inputStream.close();
                    outputStream.close();
                    Message message = mHandler.obtainMessage();
                    message.obj = file.getAbsolutePath();
                    message.what = 2;
                    mHandler.sendMessage(message);
                } catch (IOException e) {
                    e.printStackTrace();
                    mHandler.sendEmptyMessage(3);
                }
            }
        }).start();
    }

    Handler mHandler = new Handler() {
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case 2:
                    if (mOnImageLoadListener != null) {
                        String filePath = (String) msg.obj;
                        mOnImageLoadListener.onFileDownload(0, 1, filePath);
                    }
                    break;
                case 3:
                    if (mOnImageLoadListener != null) {
                        mOnImageLoadListener.onFileDownload(1, 0, "");
                    }
                    break;
                case 6:
                    if (mOnImageLoadListener != null) {
                        float position = (float) msg.obj;
                        mOnImageLoadListener.onFileDownload(3, position, "");
                    }
                    break;
            }
        }
    };

    /**
     * 获取文件夹下的文件
     */
    public static List<String> getLocalPic(String path) {
        List<String> mList = new ArrayList<>();
        File dir = new File(path);
        if (dir == null || !dir.exists() || !dir.isDirectory())
            return null;
        for (File file : dir.listFiles()) {
            if (file.isFile())
                mList.add(file.getPath());
        }
        return mList;
    }

    /**
     * 删除文件
     */
    public void deleteFile(String path) {
        File file = new File(path);
        deleteDirWihtFile(file);
    }
    /**
     * 删除文件
     *
     * @param dir
     */
    private void deleteDirWihtFile(File dir) {
        if (dir == null || !dir.exists() || !dir.isDirectory())
            return;
        for (File file : dir.listFiles()) {
            if (file.isFile())
                file.delete(); // 删除所有文件
            else if (file.isDirectory())
                deleteDirWihtFile(file); // 递规的方式删除文件夹
        }
    }
    /**
     * 销毁
     */
    public void onDestroy() {
        mOnImageLoadListener = null;
        mInstance = null;
    }
}

这里是用的github星比较多的一个YCwebview开源项目，这个里面集成了腾讯X5webview。切记下载操作必须在子线程，下载展示写一个延迟即可。