Android的库中不支持PDF。有没有办法在Android应用程序中呈现PDF文件?
当前回答
没有办法在Android webview中预览pdf文档。如果你想预览base64 pdf。它需要第三方图书馆。
构建。Gradle
compile 'com.github.barteksc:android-pdf-viewer:2.7.0'
dialog_pdf_viewer
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:orientation="vertical">
<ImageView
android:id="@+id/dialog_pdf_viewer_close"
style="@style/ExitButtonImageViewStyle"
android:src="@drawable/popup_exit" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:background="@color/white"
android:orientation="vertical">
<com.github.barteksc.pdfviewer.PDFView
android:id="@+id/pdfView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
<View style="@style/HorizontalLine" />
<com.pozitron.commons.customviews.ButtonFont
android:id="@+id/dialog_pdf_viewer_button"
style="@style/ButtonPrimary2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="15dp"
android:text="@string/agreed" />
</LinearLayout>
DailogPDFViewer.java
public class DialogPdfViewer extends Dialog {
PDFView pdfView;
byte[] decodedString;
public interface OnDialogPdfViewerListener {
void onAgreeClick(DialogPdfViewer dialogFullEula);
void onCloseClick(DialogPdfViewer dialogFullEula);
}
public DialogPdfViewer(Context context, String base64, final DialogPdfViewer.OnDialogPdfViewerListener onDialogPdfViewerListener) {
super(context);
setContentView(R.layout.dialog_pdf_viewer);
findViewById(R.id.dialog_pdf_viewer_close).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
onDialogPdfViewerListener.onCloseClick(DialogPdfViewer.this);
}
});
findViewById(R.id.dialog_pdf_viewer_button).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
onDialogPdfViewerListener.onAgreeClick(DialogPdfViewer.this);
}
});
decodedString = Base64.decode(base64.toString(), Base64.DEFAULT);
pdfView = ((PDFView) findViewById(R.id.pdfView));
pdfView.fromBytes(decodedString).load();
setOnKeyListener(new OnKeyListener() {
@Override
public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN) {
onDialogPdfViewerListener.onCloseClick(DialogPdfViewer.this);
}
return true;
}
});
}
}
其他回答
为了给这一点增加一点光明，我将不得不使用Mozilla的pdf.js解决方案。下面是一个已经编写好的实现的链接:https://bitbucket.org/butelo/pdfviewer/。
以下是我在Android Activity中添加的编辑:
private String getInternalPDFURL(String interalPDFName){
return "file:///android_asset/pdfviewer/index.html?pdf=" + interalPDFName + ".pdf";
}
以下是我在pdffile.js中所做的编辑:
var url = '../' + getPDFURL();
function getPDFURL(){
var query = window.location.search.substring(1);
var vars = query.split("=");
var pdfPage = vars[1];
return pdfPage;
}
我终于能够修改butelo的代码，使用PDF .js打开Android文件系统中的任何PDF文件。代码可以在我的GitHub上找到
我所做的是修改pdffile.js读取HTML参数文件如下:
var url = getURLParameter('file');
function getURLParameter(name) {
return decodeURIComponent((new RegExp('[?|&]' + name + '=' + '([^&;]+?)(&|#|;|$)').exec(location.search)||[,""])[1].replace(/\+/g, '%20'))||null}
所以你需要做的就是像这样在index.html后面追加文件路径:
Uri path = Uri.parse(Environment.getExternalStorageDirectory().toString() + "/data/test.pdf");
webView.loadUrl("file:///android_asset/pdfviewer/index.html?file=" + path);
更新路径变量以指向Adroid文件系统中的有效PDF。
您可以通过导入使用一个简单的方法
implementation 'com.github.barteksc:android-pdf-viewer:2.8.2'
XML代码为
<com.github.barteksc.pdfviewer.PDFView
android:id="@+id/pdfv"
android:layout_width="match_parent"
android:layout_height="match_parent">
</com.github.barteksc.pdfviewer.PDFView>
只需声明并添加一个文件到资产文件夹并分配名称
PDFView pdfView=findViewById(R.id.pdfv);
pdfView.fromAsset("agl.pdf").load();
我有GoogleDrive选项的问题，有时它会无法加载文档和“com.github.barteksc:android-pdf-viewer:2.7.0”，虽然它的文档使它看起来很容易从链接加载文档，但我未能使它工作。它总是抛出一个FileNotFoundException异常，因此经过进一步研究，我了解到它下载pdf，因此您必须使它指向该文档，我发现这有点乏味。
你可以试试这个库。它非常容易使用，并且至今仍在维护，我不知道几年之后他们是否会停止更新它。它会缓存文档，你甚至不需要跟踪它的路径。
https://levelup.gitconnected.com/open-pdf-files-in-android-without-webviews-or-intents-3cc960752cca
我使用下面的代码使用Wi-Fi打开并打印PDF。我正在发送我的整个代码，我希望它是有用的。
public class MainActivity extends Activity {
int Result_code = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button mButton = (Button)findViewById(R.id.button1);
mButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
PrintManager printManager = (PrintManager)getSystemService(Context.PRINT_SERVICE);
String jobName = " Document";
printManager.print(jobName, pda, null);
}
});
}
public void openDocument(String name) {
Intent intent = new Intent(android.content.Intent.ACTION_VIEW);
File file = new File(name);
String extension = android.webkit.MimeTypeMap.getFileExtensionFromUrl(Uri.fromFile(file).toString());
String mimetype = android.webkit.MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
if (extension.equalsIgnoreCase("") || mimetype == null) {
// if there is no extension or there is no definite mimetype, still try to open the file
intent.setDataAndType(Uri.fromFile(file), "text/*");
}
else {
intent.setDataAndType(Uri.fromFile(file), mimetype);
}
// custom message for the intent
startActivityForResult((Intent.createChooser(intent, "Choose an Application:")), Result_code);
//startActivityForResult(intent, Result_code);
//Toast.makeText(getApplicationContext(),"There are no email clients installed.", Toast.LENGTH_SHORT).show();
}
@SuppressLint("NewApi")
PrintDocumentAdapter pda = new PrintDocumentAdapter(){
@Override
public void onWrite(PageRange[] pages, ParcelFileDescriptor destination, CancellationSignal cancellationSignal, WriteResultCallback callback){
InputStream input = null;
OutputStream output = null;
try {
String filename = Environment.getExternalStorageDirectory() + "/" + "Holiday.pdf";
File file = new File(filename);
input = new FileInputStream(file);
output = new FileOutputStream(destination.getFileDescriptor());
byte[] buf = new byte[1024];
int bytesRead;
while ((bytesRead = input.read(buf)) > 0) {
output.write(buf, 0, bytesRead);
}
callback.onWriteFinished(new PageRange[]{PageRange.ALL_PAGES});
}
catch (FileNotFoundException ee){
//Catch exception
}
catch (Exception e) {
//Catch exception
}
finally {
try {
input.close();
output.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
@Override
public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes, CancellationSignal cancellationSignal, LayoutResultCallback callback, Bundle extras){
if (cancellationSignal.isCanceled()) {
callback.onLayoutCancelled();
return;
}
// int pages = computePageCount(newAttributes);
PrintDocumentInfo pdi = new PrintDocumentInfo.Builder("Name of file").setContentType(PrintDocumentInfo.CONTENT_TYPE_DOCUMENT).build();
callback.onLayoutFinished(pdi, true);
}
};
}
