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

pdf项目

 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));
 }
 }

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);

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

@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, "subject = " + meta.getSubject());
 Log.e(TAG, "keywords = " + meta.getKeywords());
 Log.e(TAG, "creator = " + meta.getCreator());
 Log.e(TAG, "producer = " + meta.getProducer());
 Log.e(TAG, "creationDate = " + meta.getCreationDate());
 Log.e(TAG, "modDate = " + meta.getModDate());
 printBookmarksTree(pdfView.getTableOfContents(), "-");
}
public void printBookmarksTree(List<PdfDocument.Bookmark> tree, String sep) {
 for (PdfDocument.Bookmark b : tree) {
 Log.e(TAG, String.format("%s %s, p %d", sep, b.getTitle(), b.getPageIdx()));
 if (b.hasChildren()) {
 printBookmarksTree(b.getChildren(), sep + "-");
 }
 }
}
/**
 * Listener for response to user permission request
 *
 * @param requestCode Check that permission request code matches
 * @param permissions Permissions that requested
 * @param grantResults Whether permissions granted
 */
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[],
 @NonNull int[] grantResults) {
 if (requestCode == PERMISSION_CODE) {
 if (grantResults.length > 0
 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
 launchPicker();
 }
 } else if (requestCode == PERMISSION_CODE_1) {
 if (grantResults.length > 0
 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
 afterViews();
 }
 }
}
}