Android实现查看预览PDF文件功能

冷不防 2022-12-08 04:41 764阅读 0赞

最近公司要求项目中增加资料库, 能在线查看pdf格式的文件, 且只能查看不能下载，在github搜索,后找到了合适的第三方框架PdfViewPager.

效果图：

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xvbmd4dWFuemhpZ3U_size_16_color_FFFFFF_t_70_pic_center]

实现步骤：

1、导入依赖包

implementation 'org.xutils:xutils:3.5.0'
    implementation  'es.voghdev.pdfviewpager:library:1.0.3'

如果你用到了了PhotoView或者commit451，因为他们之间有重复的包冲突，所以需要改为：

implementation 'org.xutils:xutils:3.5.0'
        implementation('es.voghdev.pdfviewpager:library:1.0.3') {
        
            exclude group: 'com.commit451', module: 'PhotoView'
        }

2、权限

<uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

3、XML文件：

<?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">
    
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:background="@color/colorBlue">
    
    
            <ImageView
                android:id="@+id/htdetail_back"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:padding="15dp"
                android:src="@mipmap/layout_back" />
    
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_centerInParent="true"
                android:gravity="center"
                android:text="PDF查看"
                android:textColor="@color/white"
                android:textSize="18sp" />
    
        </RelativeLayout>
    
        <View
            android:layout_width="match_parent"
            android:layout_height="0.1dp"
            android:background="@color/gray" />
    
        <RelativeLayout
            android:id="@+id/remote_pdf_root"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
    
            <es.voghdev.pdfviewpager.library.PDFViewPager
                android:id="@+id/pdfViewPager"
                android:layout_width="match_parent"
                android:layout_height="match_parent" />
    
        </RelativeLayout>
    
        <ProgressBar
            android:id="@+id/pb_bar"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:layout_marginTop="150dp"
            android:layout_gravity="center" />
    
    </LinearLayout>

4、Activity代码：

public class MainActivity extends AppCompatActivity implements DownloadFile.Listener {
        
        private RemotePDFViewPager remotePDFViewPager;
        private PDFPagerAdapter adapter;
        private ImageView contractBack;
        private RelativeLayout remotePdfRoot;
        private ProgressBar pbBar;
    
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
        
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            initView();
            initData();
            initListener();
        }
    
        private void initView() {
        
            contractBack = findViewById(R.id.htdetail_back);
            remotePdfRoot = findViewById(R.id.remote_pdf_root);
            pbBar = findViewById(R.id.pb_bar);
    
            remotePdfRoot.setVisibility(View.GONE);
        }
    
        private void initData() {
        
            //pdf链接
            String url = "https://css4.pub/2015/textbook/somatosensory.pdf";
            setDownloadListener(url);
        }
    
        private void initListener() {
        
            contractBack.setOnClickListener(new View.OnClickListener() {
        
                @Override
                public void onClick(View view) {
        
                    finish();
                }
            });
        }
    
        /*设置监听*/
        protected void setDownloadListener(String url) {
        
            final DownloadFile.Listener listener = this;
            remotePDFViewPager = new RemotePDFViewPager(this, url, listener);
            remotePDFViewPager.setId(R.id.pdfViewPager);
        }
    
        /*加载成功调用*/
        @Override
        public void onSuccess(String url, String destinationPath) {
        
            pbBar.setVisibility(View.GONE);
            remotePdfRoot.setVisibility(View.VISIBLE);
    
            adapter = new PDFPagerAdapter(this, FileUtil.extractFileNameFromURL(url));
            remotePDFViewPager.setAdapter(adapter);
            updateLayout();
        }
    
        /*更新视图*/
        private void updateLayout() {
        
            remotePdfRoot.removeAllViewsInLayout();
            remotePdfRoot.addView(remotePDFViewPager, LinearLayout.LayoutParams.MATCH_PARENT,
                    LinearLayout.LayoutParams.WRAP_CONTENT);
        }
    
        /*加载失败调用*/
        @Override
        public void onFailure(Exception e) {
        
            pbBar.setVisibility(View.GONE);
            ToastUtil.showToast(this, "数据加载错误");
        }
    
        @Override
        public void onProgressUpdate(int progress, int total) {
        
    
        }
    }

需要Demo的童鞋关注底部公众号并回复：“PdfDemo” 即可获取哦.

--------------------

小编整理了一份Android电子书籍，需要的童鞋关注底部公众号(longxuanzhigu)回复：“e\_books” 即可获取哦！  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xvbmd4dWFuemhpZ3U_size_16_color_FFFFFF_t_70_pic_center 1]

以下是公众号(longxuanzhigu)，之后发布的文章会同步到该公众号，方便交流学习Android知识，欢迎关注：

![在这里插入图片描述][20200917175554388.png_pic_center]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xvbmd4dWFuemhpZ3U_size_16_color_FFFFFF_t_70_pic_center]: /images/20221123/43c8497e97e943d883c14acbdff30a19.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xvbmd4dWFuemhpZ3U_size_16_color_FFFFFF_t_70_pic_center 1]: /images/20221123/423c0b3605fa47488937c3ddc1f39528.png
[20200917175554388.png_pic_center]: /images/20221123/e7a5c25c02984e34a00290ea199da69c.png