Android 如何通过 SD 卡中的 Intent 打开 PDF

How to open a PDF via Intent from SD card

提问by Mike T

I'm trying to launch an Intentto open a pdf inside my assets folder in my app. I've read dozens of posts but am still stuck. Apparently I need to copy the pdf to the sd card first then launch an Intent. It still doesn't work.

我正在尝试启动Intent以在我的应用程序中的资产文件夹中打开 pdf。我已经阅读了数十篇文章，但仍然卡住了。显然我需要先将 pdf 复制到 SD 卡，然后启动Intent. 它仍然不起作用。

I think the problem is the Intentlaunching so I'm simply trying to open a file "example.pdf" that I copied onto the SD card using this code:

我认为问题在于Intent启动，所以我只是尝试打开一个文件“example.pdf”，我使用以下代码将其复制到 SD 卡上：

Log.w("IR", "TRYING TO RENDER: " + Environment.getExternalStorageDirectory().getAbsolutePath()+"/example.pdf");
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.parse(Environment.getExternalStorageDirectory().getAbsolutePath()+"/example.pdf"), "application/pdf");
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

try {
    startActivity(intent);
    Log.e("IR", "No exception");
} 
catch (ActivityNotFoundException e) {
    Log.e("IR", "error: " + e.getMessage());
    Toast.makeText(InvestorRelations.this, 
        "No Application Available to View PDF", 
        Toast.LENGTH_SHORT).show();
}

This is my LogCat output.

这是我的 LogCat 输出。

05-10 10:35:10.950: W/IR(4508): TRYING TO RENDER: /mnt/sdcard/example.pdf
05-10 10:35:10.960: E/IR(4508): No exception

Except when this code is run, I get the following Toast (not produced by my app)

除非运行此代码，否则我会得到以下 Toast（不是由我的应用程序生成的）

"Not a supported document type"

“不是受支持的文档类型”

But I can open the document manually through the PDF viewing app installed. Any help would be hugely appreciated.

但我可以通过安装的 PDF 查看应用程序手动打开文档。任何帮助将不胜感激。

回答by user370305

Try this code, display pdf file From /sdcard

试试这个代码，显示来自 /sdcard 的 pdf 文件

File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/example.pdf");
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file), "application/pdf");
intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
startActivity(intent);

回答by Kapil Rajput

For Android Nougat and above version of android some more work have to be done otherwise app will not able to open .pdffile. We have to set a temporary permission to URIusing FileProvider

对于 Android Nougat 及以上版本的 android，还需要做一些工作，否则应用程序将无法打开.pdf文件。我们必须设置一个临时权限才能URI使用FileProvider

 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
   File file=new File(mFilePath);
   Uri uri = FileProvider.getUriForFile(this, getPackageName() + ".provider", file);
   intent = new Intent(Intent.ACTION_VIEW);
   intent.setData(uri);
   intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
   startActivity(intent);
   } else {
   intent = new Intent(Intent.ACTION_VIEW);
   intent.setDataAndType(Uri.parse(mFilePath), "application/pdf");
   intent = Intent.createChooser(intent, "Open File");
   intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
   startActivity(intent);
   }

回答by Deepshikha Puri

Download source code from here (Open pdf file from sdcard in android programmatically)

从这里下载源代码（以编程方式从 android 中的 sdcard 打开 pdf 文件）

Add this dependency:

添加此依赖项：

compile ‘com.github.barteksc:android-pdf-viewer:2.0.3'

activity_main.xml:

活动_main.xml：

<?xml version=”1.0″ encoding=”utf-8″?>
<RelativeLayout xmlns:android=”http://schemas.android.com/apk/res/android&#8221;
xmlns:tools=”http://schemas.android.com/tools&#8221;
android:id=”@+id/activity_main”
android:layout_width=”match_parent”
android:layout_height=”match_parent”
android:background=”#efefef”>

<ListView
android:layout_width=”match_parent”
android:id=”@+id/lv_pdf”
android:divider=”#efefef”
android:layout_marginLeft=”10dp”
android:layout_marginRight=”10dp”
android:layout_marginTop=”10dp”
android:layout_marginBottom=”10dp”
android:dividerHeight=”5dp”
android:layout_height=”wrap_content”>

</ListView>
</RelativeLayout>

MainActivity.java:

主活动.java：

package com.pdffilefromsdcard;

import android.Manifest;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Environment;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

public class MainActivity extends AppCompatActivity {

ListView lv_pdf;
public static ArrayList<File> fileList = new ArrayList<File>();
PDFAdapter obj_adapter;
public static int REQUEST_PERMISSIONS = 1;
boolean boolean_permission;
File dir;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();

}

private void init() {

lv_pdf = (ListView) findViewById(R.id.lv_pdf);
dir = new File(Environment.getExternalStorageDirectory().getAbsolutePath());
fn_permission();
lv_pdf.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Intent intent = new Intent(getApplicationContext(), PdfActivity.class);
intent.putExtra(“position”, i);
startActivity(intent);

Log.e(“Position”, i + “”);
}
});
}

public ArrayList<File> getfile(File dir) {
File listFile[] = dir.listFiles();
if (listFile != null && listFile.length > 0) {
for (int i = 0; i < listFile.length; i++) {

if (listFile[i].isDirectory()) {
getfile(listFile[i]);

} else {

boolean booleanpdf = false;
if (listFile[i].getName().endsWith(“.pdf”)) {

for (int j = 0; j < fileList.size(); j++) {
if (fileList.get(j).getName().equals(listFile[i].getName())) {
booleanpdf = true;
} else {

}
}

if (booleanpdf) {
booleanpdf = false;
} else {
fileList.add(listFile[i]);

}
}
}
}
}
return fileList;
}
private void fn_permission() {
if ((ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)) {

if ((ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, android.Manifest.permission.READ_EXTERNAL_STORAGE))) {
} else {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{android.Manifest.permission.READ_EXTERNAL_STORAGE},
REQUEST_PERMISSIONS);

}
} else {
boolean_permission = true;

getfile(dir);

obj_adapter = new PDFAdapter(getApplicationContext(), fileList);
lv_pdf.setAdapter(obj_adapter);

}
}

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == REQUEST_PERMISSIONS) {

if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

boolean_permission = true;
getfile(dir);

obj_adapter = new PDFAdapter(getApplicationContext(), fileList);
lv_pdf.setAdapter(obj_adapter);

} else {
Toast.makeText(getApplicationContext(), “Please allow the permission”, Toast.LENGTH_LONG).show();

}
}
}

}

activity_pdf.xml:

活动_pdf.xml：

<?xml version=”1.0″ encoding=”utf-8″?>
<LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android&#8221;
android:layout_width=”match_parent”
android:background=”#ffffff”
android:layout_height=”match_parent”
android:orientation=”vertical”>

<com.github.barteksc.pdfviewer.PDFView
android:id=”@+id/pdfView”
android:layout_margin=”10dp”
android:layout_width=”match_parent”
android:layout_height=”match_parent” />
</LinearLayout>

PdfActivity.java:

pdfActivity.java：

package com.pdffilefromsdcard;

包 com.pdffilefromsdcard;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

import com.github.barteksc.pdfviewer.PDFView;
import com.github.barteksc.pdfviewer.listener.OnLoadCompleteListener;
import com.github.barteksc.pdfviewer.listener.OnPageChangeListener;
import com.github.barteksc.pdfviewer.scroll.DefaultScrollHandle;
import com.shockwave.pdfium.PdfDocument;

import java.io.File;
import java.util.List;

public class PdfActivity extends AppCompatActivity implements OnPageChangeListener,OnLoadCompleteListener {

PDFView pdfView;
Integer pageNumber = 0;
String pdfFileName;
String TAG=”PdfActivity”;
int position=-1;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pdf);
init();
}

private void init(){
pdfView= (PDFView)findViewById(R.id.pdfView);
position = getIntent().getIntExtra(“position”,-1);
displayFromSdcard();
}

private void displayFromSdcard() {
pdfFileName = MainActivity.fileList.get(position).getName();

pdfView.fromFile(MainActivity.fileList.get(position))
.defaultPage(pageNumber)
.enableSwipe(true)

.swipeHorizontal(false)
.onPageChange(this)
.enableAnnotationRendering(true)
.onLoad(this)
.scrollHandle(new DefaultScrollHandle(this))
.load();
}
@Override
public void onPageChanged(int page, int pageCount) {
pageNumber = page;
setTitle(String.format(“%s %s / %s”, pdfFileName, page + 1, pageCount));
}
@Override
public void loadComplete(int nbPages) {
PdfDocument.Meta meta = pdfView.getDocumentMeta();
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 + “-“);
}
}
}
}

Thanks!

谢谢！

回答by artkoenig

The accepted answer is outdated now. Use FileProviderfor file sharing.

接受的答案现在已经过时了。使用FileProvider进行文件共享。

回答by Blundell

It may have something to do with the fact that files in the assets folder get compressed.

这可能与资产文件夹中的文件被压缩有关。

Try moving it to your res/raw/folder.

尝试将其移动到您的res/raw/文件夹。

More info: https://stackoverflow.com/a/4432804/413127

更多信息：https: //stackoverflow.com/a/4432804/413127

回答by Paolo Colombo

This code allow to pickup a pdf file from your SD card

此代码允许从您的 SD 卡中提取 pdf 文件

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("application/pdf");
startActivityForResult(intent, 200);