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

[2017/11/20]

增加abi判断,下载对应cpu的插件包

pdf插件包只做了简单的混淆缩小体积 3m左右

[2017/07/24]

增加插件升级功能

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

pdf项目

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, "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();
        }
    }
}

}