Android生成PDF文件

本文主要是操作如何将选取的图片生成一个PDF文件
/**转换的PDF的质量*/private final int QualityHigh = 1;private final int QualityMiddle = 2;private final int QualitySmall = 3;private List imageArr=new ArrayList<>;private String fileName;private int quality = QualityMiddle;private String UserBean user;@OnClick(R.id.btn_generate)@Overridepublic void onClick(View v) {    super.onClick(v);    switch (v.getId()) {        case R.id.btn_generate:            fileName = etFileName.getText().toString().trim();            File[] files = new File(user.getUserFileSubPath() + "/" + FilePath.PDF).listFiles();            for (File f : files) {                if (f.getName().startsWith(fileName)) {                    showToast("文件已存在");                    return;                }            }            generate();            break;    }}/**PDF转换*/  private void generate(){        Observable.just(imageArr)                .compose(this.>bindUntilEvent(ActivityEvent.DESTROY))                .observeOn(Schedulers.computation())                .map(new Function, PdfDocument>() {                    @Override                    public PdfDocument apply(List localImageBeans) throws Exception {                        // create a new document                        PdfDocument document = new PdfDocument();                        for (int i = 0; i < localImageBeans.size(); i++) {                            LocalImageBean bean = localImageBeans.get(i);                            // crate a page description                            BitmapFactory.Options options = new BitmapFactory.Options();                            options.inPreferredConfig = Bitmap.Config.RGB_565;                            float scale;                            switch (quality) {                                case QualityMiddle://                                            options.inPreferredConfig = Bitmap.Config.ARGB_4444;                                    scale = 0.75f;                                    break;                                case QualitySmall://                                            options.inPreferredConfig = Bitmap.Config.RGB_565;                                    scale = 0.5f;                                    break;                                default://                                            options.inPreferredConfig = Bitmap.Config.ARGB_8888;                                    scale = 1f;                                    break;                            }                            int screenW = (int) (Utils.getScreenWidth(getImplContext()) * scale);                            int screenH = (int) (Utils.getScreenHeight(getImplContext()) * scale);                            if (bean.getRotating() % 180 != 0) {                                //当前是否横向                                int temp = screenW;                                screenW = screenH;                                screenH = temp;                            }                            PdfDocument.PageInfo pageInfo = new PdfDocument.PageInfo.Builder(                                    screenW,                                    screenH,                                    i).create();                            // start a page                            PdfDocument.Page page = document.startPage(pageInfo);                            // draw something on the page                            WeakReference wfb = new WeakReference<>(BitmapFactory.decodeFile(bean.getRawPath(), options));                            Bitmap bitmap = wfb.get();                            Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);                            int bitmapW = (int) (bitmap.getWidth() * scale);                            int bitmapH = (int) (bitmap.getHeight() * scale);                            Matrix matrix = new Matrix();                            matrix.postRotate(bean.getRotating());                            WeakReference nwfb = new WeakReference<>(Bitmap.createScaledBitmap(bitmap, bitmapW, bitmapH, false));                            if (bean.getRotating() % 180 != 0) {                                int temp = bitmapW;                                bitmapW = bitmapH;                                bitmapH = temp;                            }                            Bitmap newBM = nwfb.get();                            Rect dst = new Rect(0, 0, bitmapW, bitmapH);                            page.getCanvas().drawBitmap(newBM, null, dst, paint);                            bitmap.recycle();                            wfb.clear();                            newBM.recycle();                            nwfb.clear();                            document.finishPage(page);                        }                        // write the document content                        OutputStream out = new FileOutputStream(user.getUserFileSubPath() + "/" + FilePath.PDF + "/" + user.getFileName(fileName, "pdf"));                        document.writeTo(out);                        out.close();                        document.close();                        //close the document                        return document;                    }                })                .observeOn(AndroidSchedulers.mainThread())                .subscribe(new Observer() {                    @Override                    public void onSubscribe(Disposable d) {                        showLoading();                    }                    @Override                    public void onNext(PdfDocument pdfDocument) {                    }                    @Override                    public void onError(Throwable e) {                        hideLoading();                        LogUtils.e(e);                    }                    @Override                    public void onComplete() {                        showToast("添加成功");                        hideLoading();                        finish();                    }                });    }
调用上述代码即可转换成PDF,imageArr是选中的要生成PDF的图片集合，UserBean是用户的实体类
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