Вы можете просмотреть PDF-файл в проекте Android по-разному.Я опишу некоторые из них здесь -
1.Использование библиотеки: Шаги ниже: Установка Добавить в build.gradle : implementation 'com.github.barteksc:android-pdf-viewer:2.8.2' ProGuard Если вы используете ProGuard, добавьте следующее правило в файл конфигурации proguard:-keep class com.shockwave.** Включить PDFView в макет <com.github.barteksc.pdfviewer.PDFView
android:id="@+id/pdfView"
android:layout_width="match_parent"
android:layout_height="match_parent"/>Дополнительная ссылка здесь 2.Загрузить PDF-URL в веб-просмотр:
webview = (WebView)findViewById(R.id.webview);
progressbar = (ProgressBar) findViewById(R.id.progressbar);
webview.getSettings().setJavaScriptEnabled(true);
String filename = file_url_with_name;
webview.loadUrl(file_url + filename);
webview.setWebViewClient(new WebViewClient() {
public void onPageFinished(WebView view, String url) {
// do your stuff here
progressbar.setVisibility(View.GONE);
}
});
3.Вручную показать файл PDF в Imageview
// Example for creating manual PDF viewer into imageview used butterknife view binding<br/>
public class PdfRenderActivity extends AppCompatActivity {
@BindView(R.id.pdf_image) ImageView imageViewPdf;
@BindView(R.id.button_pre_doc) FloatingActionButton prePageButton;
@BindView(R.id.button_next_doc) FloatingActionButton nextPageButton;
private static final String FILENAME = "report.pdf";
private int pageIndex;
private PdfRenderer pdfRenderer;
private PdfRenderer.Page currentPage;
private ParcelFileDescriptor parcelFileDescriptor;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pdf_render);
ButterKnife.bind(this);
pageIndex = 0;
}
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
@Override
protected void onStart() {
super.onStart();
try {
openRenderer(getApplicationContext());
showPage(pageIndex);
} catch (IOException e) {
e.printStackTrace();
}
}
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
@Override
public void onStop() {
try {
closeRenderer();
} catch (IOException e) {
e.printStackTrace();
}
super.onStop();
}
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
@OnClick(R.id.button_pre_doc)
public void onPreviousDocClick(){
showPage(currentPage.getIndex() - 1);
}
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
@OnClick(R.id.button_next_doc)
public void onNextDocClick(){
showPage(currentPage.getIndex() + 1);
}
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private void openRenderer(Context context) throws IOException {
// In this sample, we read a PDF from the assets directory.
File file = new File(context.getCacheDir(), FILENAME);
if (!file.exists()) {
// Since PdfRenderer cannot handle the compressed asset file directly, we copy it into
// the cache directory.
InputStream asset = context.getAssets().open(FILENAME);
FileOutputStream output = new FileOutputStream(file);
final byte[] buffer = new byte[1024];
int size;
while ((size = asset.read(buffer)) != -1) {
output.write(buffer, 0, size);
}
asset.close();
output.close();
}
parcelFileDescriptor = ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);
// This is the PdfRenderer we use to render the PDF.
if (parcelFileDescriptor != null) {
pdfRenderer = new PdfRenderer(parcelFileDescriptor);
}
}
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private void closeRenderer() throws IOException {
if (null != currentPage) {
currentPage.close();
}
pdfRenderer.close();
parcelFileDescriptor.close();
}
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private void showPage(int index) {
if (pdfRenderer.getPageCount() <= index) {
return;
}
// Make sure to close the current page before opening another one.
if (null != currentPage) {
currentPage.close();
}
// Use `openPage` to open a specific page in PDF.
currentPage = pdfRenderer.openPage(index);
// Important: the destination bitmap must be ARGB (not RGB).
Bitmap bitmap = Bitmap.createBitmap(currentPage.getWidth(), currentPage.getHeight(),
Bitmap.Config.ARGB_8888);
// Here, we render the page onto the Bitmap.
// To render a portion of the page, use the second and third parameter. Pass nulls to get
// the default result.
// Pass either RENDER_MODE_FOR_DISPLAY or RENDER_MODE_FOR_PRINT for the last parameter.
currentPage.render(bitmap, null, null, PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY);
// We are ready to show the Bitmap to user.
imageViewPdf.setImageBitmap(bitmap);
updateUi();
}
/**
* Updates the state of 2 control buttons in response to the current page index.
*/
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private void updateUi() {
int index = currentPage.getIndex();
int pageCount = pdfRenderer.getPageCount();
prePageButton.setEnabled(0 != index);
nextPageButton.setEnabled(index + 1 < pageCount);
}
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
public int getPageCount() {
return pdfRenderer.getPageCount();
}
}
Документ здесь