Android 插件式打开PDF文件

#### 网上有很多使用pdfium项目做pdf功能,结果加入到自己项目中导致自己的apk大了20M左右,下面按照QQ加载3M左右插件的思路做了一个pdf插件 ### 简单流程 打开pdf→检查是否安装插件 →未安装→下载安装插件→使用插件打开pdf →安装过→使用插件打开pdf  ### 项目根目录有个123.pdf的测试文件 拷到手机根目录 如下路径 private String path = "/storage/emulated/0/123.pdf"; adb command adb push /Volumes/Data/DownloadData/123.pdf /sdcard ### 360插件 [https://github.com/DroidPluginTeam/DroidPlugin](https://github.com/DroidPluginTeam/DroidPlugin) ### pdf项目 [https://github.com/barteksc/AndroidPdfViewer](https://github.com/barteksc/AndroidPdfViewer) (直接项目打包apk)打成apk插件之前把PDFViewActivity修改获取intent得到文件路径,如下, if (getIntent() != null) { String key = getIntent().getStringExtra("key"); if (TextUtils.isEmpty(key)) { Toast.makeText(this, "key没有", 1000).show(); } else { Toast.makeText(this, key, 1000).show(); displayFromUri(new File(key)); } } 调用插件 PackageManager pm = mContext.getPackageManager(); Intent intent = pm.getLaunchIntentForPackage(item.packageInfo.packageName); intent.putExtra("key", mPath); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); ((Activity) mContext).startActivity(intent); 注意 直接打包AndroidPdfViewer项目apk将会有20M左右! 原因:AndroidPdfViewer中compile 'com.github.barteksc:pdfium-android:1.6.0'的项目中的so库非常大! libmodpdfium.so(4M多) jnipdfium(100k多) 然后他又添加了全平台的so库x86_64,x86,mips,arm64-v8a,armeabi,armeabi-v7a 导致项目20M左右!  解决办法: 打包AndroidPdfViewer项目的时候 配置 defaultConfig { ndk { abiFilters "armeabi"//, "armeabi-v7a", "arm64-v8a",x86_64,x86,mips } } 分别过滤只要x86,arm,mips等平台的6个apk插件包 将6个插件包放到服务端 这时下载插件的是时候只需要下载对应Android手机对应CPU的apk插件就好,就能达到QQ加载pdf插件3M左右大小的水平 为了方便测试兼容大部分手机,目前打的插件包是 "armeabi", "armeabi-v7a", "arm64-v8a"三个平台的插件,此时插件大小10M左右 PDFViewActivity完整如下 @EActivity(R.layout.activity_main) @OptionsMenu(R.menu.options) public class PDFViewActivity extends AppCompatActivity implements OnPageChangeListener, OnLoadCompleteListener { private static final String TAG = PDFViewActivity.class.getSimpleName(); private final static int REQUEST_CODE = 42; public static final int PERMISSION_CODE = 42042; public static final int PERMISSION_CODE_1 = 42043; public static final String SAMPLE_FILE = "sample.pdf"; public static final String READ_EXTERNAL_STORAGE = "android.permission.READ_EXTERNAL_STORAGE"; @ViewById PDFView pdfView; @NonConfigurationInstance Uri uri; @NonConfigurationInstance Integer pageNumber = 0; String pdfFileName; @OptionsItem(R.id.pickFile) void pickFile() { int permissionCheck = ContextCompat.checkSelfPermission(this, READ_EXTERNAL_STORAGE); if (permissionCheck != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions( this, new String[]{READ_EXTERNAL_STORAGE}, PERMISSION_CODE ); return; } launchPicker(); } void launchPicker() { Intent intent = new Intent(Intent.ACTION_GET_CONTENT); intent.setType("application/pdf"); try { startActivityForResult(intent, REQUEST_CODE); } catch (ActivityNotFoundException e) { //alert user that file manager not working Toast.makeText(this, R.string.toast_pick_file_error, Toast.LENGTH_SHORT).show(); } } @AfterViews void afterViews() { int permissionCheck = ContextCompat.checkSelfPermission(this, READ_EXTERNAL_STORAGE); if (permissionCheck != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions( this, new String[]{READ_EXTERNAL_STORAGE}, PERMISSION_CODE_1 ); Toast.makeText(this, "允许后才能查看您的文档哟", 1000).show(); return; } if (getIntent() != null) { String key = getIntent().getStringExtra("key"); // key = "/storage/emulated/0/aaaa.pdf"; if (TextUtils.isEmpty(key)) { Toast.makeText(this, "key没有", 1000).show(); } else { Toast.makeText(this, key, 1000).show(); displayFromUri(new File(key)); } } // if (uri != null) { // displayFromUri(uri); // } else { // displayFromAsset(SAMPLE_FILE); // } setTitle(pdfFileName); } private void displayFromAsset(String assetFileName) { pdfFileName = assetFileName; pdfView.fromAsset(SAMPLE_FILE) .defaultPage(pageNumber) .onPageChange(this) .enableAnnotationRendering(true) .onLoad(this) .scrollHandle(new DefaultScrollHandle(this)) .load(); } private void displayFromUri(Uri uri) { pdfFileName = getFileName(uri); pdfView.fromUri(uri) .defaultPage(pageNumber) .onPageChange(this) .enableAnnotationRendering(true) .onLoad(this) .scrollHandle(new DefaultScrollHandle(this)) .load(); } private void displayFromUri(File file) { pdfFileName = file.getName(); pdfView.fromFile(file) .defaultPage(pageNumber) .onPageChange(this) .enableAnnotationRendering(true) .onLoad(this) .scrollHandle(new DefaultScrollHandle(this)) .load(); } @OnActivityResult(REQUEST_CODE) public void onResult(int resultCode, Intent intent) { if (resultCode == RESULT_OK) { uri = intent.getData(); displayFromUri(uri); } } @Override public void onPageChanged(int page, int pageCount) { pageNumber = page; setTitle(String.format("%s %s / %s", pdfFileName, page + 1, pageCount)); } public String getFileName(Uri uri) { String result = null; if (uri.getScheme().equals("content")) { Cursor cursor = getContentResolver().query(uri, null, null, null, null); try { if (cursor != null && cursor.moveToFirst()) { result = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME)); } } finally { if (cursor != null) { cursor.close(); } } } if (result == null) { result = uri.getLastPathSegment(); } return result; } @Override public void loadComplete(int nbPages) { PdfDocument.Meta meta = pdfView.getDocumentMeta(); Log.e(TAG, "title = " + meta.getTitle()); Log.e(TAG, "author = " + meta.getAuthor()); Log.e(TAG, "su