Android实现在线预览office文档的示例详解

package com.example.officedocpreview;
 
import android.Manifest;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.*;
import android.view.View;
import android.webkit.*;
import android.widget.*;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import com.tencent.smtt.sdk.TbsReaderView;
 
import java.io.File;
impjsort java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
 
public class MainActivity extends AppCompatActivity {
 
    private static final int REQ_STORAGE = 1001;
    private WebView webView;
    private TbsReaderView tbsView;
    private FrameLayout container;
    private String remoteDocUrl = "https://example.com/test.docx";
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        webView    = findViewById(R.id.web_view);
        tbsView    = findViewById(R.id.tbs_view);
        container  = findVChina编程iewById(R.id.tbs_container);
 
        findViewById(R.id.btn_web_preview).setOnClickListener(v -> previewWithWeb());
        findViewById(R.id.btn_tbs_preview).setOnClickListener(v -> previewWithTbs());
    }
 
    /** 方案一：WebView + Office Online */
    private void previewWithWeb() {
        webView.setVisibility(View.VISIBLE);
        container.setVisibility(View.GONE);
 
        WebSettings ws = webView.getSettings();
        ws.setJavaScriptEnabled(true);
        ws.setBuiltInZoomControls(true);
        ws.setDisplayZoomControls(false);
        ws.setDomStorageEnabled(true);
 
        String urlEncoded = Uri.encode(remoteDocUrl);
        String previewUrl = "https://view.officeapps.live.com/op/view.aspx?src=" + urlEncoded;
        webView.loadUrl(previewUrl);
    }
 
    /** 方案二：TBS SDK 预览，需要存储权限 */
    private void previewWithTbs() {
        webView.setVisibility(View.GONE);
        container.setVisibility(View.VISIBLE);
        if (ContextCompat.checkSelfPermission(this,
            Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this,
                new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQ_STORAGE);
        } else {
            downloadAndOpenWithTbs(remoteDocUrl);
        }
    }
 
    @Override
    public void onRequestPermissionsResult(int req,
        @NonNull String[] perms, @NonNull int[] grantResults) {
        if (req == REQ_STORAGE && grantResults.length>0
            && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            downloadAndOpenWithTbs(remoteDocUrl);
        } else {
            Toast.makeText(this, "存储权限被拒绝", Toast.LENGTH_SHORT).show();
        }
    }
 
    /** 下载到本地后用 TbsReaderView 打开 */
    private void downloadAndOpenWithTbs(String urlStr) {
        new Thread(() -> {
            try {
                URL url = new URL(urlStr);
                HttpURLConnection conn =
                    (HttpURLConnection) url.openConnection();
                conn.connect();
                InputStream is = conn.getInputStream();
                File file = new File(getExternalFilesDir(null), "temp.docx");
                FileOutputStream fos = new FileOutputStream(file);
                byte[] buf = new byte[4096];
                int len;
                while ((len = is.read(buf))>0) fos.write(buf,0,len);
                fos.close();
                isphp.close();
 
                runOnUiThread(() -> openFileInTbs(file.getAbsolutePath()));
            } catch (Exception e) {
                e.printStackTrace();
                runOnUiThread(() ->
                    Toast.makeText(this, "下载失败", Toast.LENGTH_SHORT).show());
            }
        }).start();
    }
 
    private void openFileInTbs(String filePath) {
        Bundle params = new Bundle();
        params.putString(TbsReaderView.KEY_FILE_PATH, filePath);
        params.putString(TbsReaderView.KEY_TEMP_PATH,
            getExternalFilesDir(null).getPath());
        boolean ok = tbsView.preOpen(getFileType(filePath), false);
        if (ok) {
            tbsView.openFile(params);
        } else {
            Toast.makeText(this, "TBS 内核未加载或不支持", Toast.LENGTH_SHORT).show();
        }
    }
 
    private String getFileType(String path) {
        if (path == null || !path.contains(".")) return "";
        return path.substring(path.lastIndexOf('.') + 1);
    }
 
   编程China编程 @Override
    protected void onDestroy() {
        super.onDestroy();
        tbsView.onStop();
    }
}

<!-- AndroidManifest.xml —— 声明 INTERNET 与读写权限，并注册 TbsReaderView 权限 -->
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.officedocpreview">
  <uses-permission android:name="android.permission.INTERNET"/>
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
  <application
      android:allowBackup="true"
      android:label="OfficePreview"
      android:icon="@mipmap/ic_launcher"
      android:theme="@style/Theme.AppCompat.Light.NoActionBar">
    <activity android:name=".MainActivity">
      <intent-filter>
        <action android:name="android.intent.action.MAIN"/>
        <category android:name="android.intent.category.LAUNCHER"/>
      </intent-filter>
    </activity>
  </application>
</manifest>

​​​​​​​<!-- activity_main.xml —— 同时包含 WebView 与 TbsReaderView -->
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
 
  <!-- WebView 方式预览 -->
  <WebView
      android:id="@+id/web_view"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:visibility="gone"/>
 
  <!-- TBS SDK 方式预览 -->
  <FrameLayout
      android:id="@+id/tbs_container"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:visibility="gone">
    <com.tencent.smtt.sdk.TbsReaderView
        android:id="@+id/tbs_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
  </FrameLayout>
 
  <!-- 底部按钮 -->
  <LinearLayout
      android:layout_gravity="bottom|center_horizontal"
      android:orientation="horizontal"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:padding="16dp">
    <Button
        android:id="@+id/btn_web_preview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Web 预览"/>
    <Button
        android:id="@+id/btn_tbs_preview"
        android:layout_marginStart="16dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TBS 预览"/>
  </LinearLayout>
</FrameLayout>