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[英]How can i open PDF file from SdCard in my Application programmatically but not in device installed PDFViewer?
[英]Open a selected file (image, pdf, …) programmatically from my Android Application?
我正在開發一個 Android 應用程序,它應該能夠打開特定文件夾中的選定文件。
我已經嘗試過這個,但是在選擇了我想要打開它的應用程序后,我收到了這條消息:
不可能加載
在嘗試了很多線程 1和線程 2 之后,我使用這些代碼行來做到這一點:
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.parse("/mnt/sdcard/xxx/xxx/Pictures/xxx.jpg"), "image/*");
myContext.startActivity(intent);
我怎么能弄明白呢?
試試下面的代碼。 我正在使用此代碼打開 PDF 文件。 您也可以將它用於其他文件。
File file = new File(Environment.getExternalStorageDirectory(),
"Report.pdf");
Uri path = Uri.fromFile(file);
Intent pdfOpenintent = new Intent(Intent.ACTION_VIEW);
pdfOpenintent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
pdfOpenintent.setDataAndType(path, "application/pdf");
try {
startActivity(pdfOpenintent);
}
catch (ActivityNotFoundException e) {
}
如果要打開文件,可以更改setDataAndType(path, "application/pdf")
。 如果你想以相同的意圖打開不同的文件,你可以使用Intent.createChooser(intent, "Open in...");
. 有關更多信息,請查看如何使用多個操作創建意圖。
使用此代碼,它幫助我打開所有類型的文件......
private void openFile(File url) {
try {
Uri uri = Uri.fromFile(url);
Intent intent = new Intent(Intent.ACTION_VIEW);
if (url.toString().contains(".doc") || url.toString().contains(".docx")) {
// Word document
intent.setDataAndType(uri, "application/msword");
} else if (url.toString().contains(".pdf")) {
// PDF file
intent.setDataAndType(uri, "application/pdf");
} else if (url.toString().contains(".ppt") || url.toString().contains(".pptx")) {
// Powerpoint file
intent.setDataAndType(uri, "application/vnd.ms-powerpoint");
} else if (url.toString().contains(".xls") || url.toString().contains(".xlsx")) {
// Excel file
intent.setDataAndType(uri, "application/vnd.ms-excel");
} else if (url.toString().contains(".zip")) {
// ZIP file
intent.setDataAndType(uri, "application/zip");
} else if (url.toString().contains(".rar")){
// RAR file
intent.setDataAndType(uri, "application/x-rar-compressed");
} else if (url.toString().contains(".rtf")) {
// RTF file
intent.setDataAndType(uri, "application/rtf");
} else if (url.toString().contains(".wav") || url.toString().contains(".mp3")) {
// WAV audio file
intent.setDataAndType(uri, "audio/x-wav");
} else if (url.toString().contains(".gif")) {
// GIF file
intent.setDataAndType(uri, "image/gif");
} else if (url.toString().contains(".jpg") || url.toString().contains(".jpeg") || url.toString().contains(".png")) {
// JPG file
intent.setDataAndType(uri, "image/jpeg");
} else if (url.toString().contains(".txt")) {
// Text file
intent.setDataAndType(uri, "text/plain");
} else if (url.toString().contains(".3gp") || url.toString().contains(".mpg") ||
url.toString().contains(".mpeg") || url.toString().contains(".mpe") || url.toString().contains(".mp4") || url.toString().contains(".avi")) {
// Video files
intent.setDataAndType(uri, "video/*");
} else {
intent.setDataAndType(uri, "*/*");
}
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
} catch (ActivityNotFoundException e) {
Toast.makeText(context, "No application found which can open the file", Toast.LENGTH_SHORT).show();
}
}
從這里下載源代碼( https://deepshikhapuri.wordpress.com/2017/04/24/open-pdf-file-from-sdcard-in-android-programmatically/ )
活動_main.xml:
<?xml version=”1.0″ encoding=”utf-8″?>
<RelativeLayout xmlns:android=”http://schemas.android.com/apk/res/android”
xmlns:tools=”http://schemas.android.com/tools”
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>
主活動.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();
}
}
}
}
活動_pdf.xml:
<?xml version=”1.0″ encoding=”utf-8″?>
<LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android”
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:
package 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 + “-“);
}
}
}
}
謝謝!
試試下面的代碼。
File file = new File(path); // path = your file path
lastSlash = file.toString().lastIndexOf('/');
if (lastSlash >= 0)
{
fileName = url.toString().substring(lastSlash + 1);
}
if (fileName.endsWith("pdf"))
{
mimeType = "application/pdf";
}
else
{
mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension
(MimeTypeMap.getFileExtensionFromUrl(path));
}
Uri uri_path = Uri.fromFile(file);
Intent intent = new Intent(android.content.Intent.ACTION_VIEW);
intent.putExtra(PATH, path);
intent.putExtra(MIMETYPE, mimeType);
intent.setType(mimeType);
intent.setDataAndType(uri_path, mimeType);
startActivity(intent);
試試這個,將此代碼添加到您的清單文件中
<provider
android:name="androidx.core.content.FileProvider"
android:authorities="${applicationId}.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/provider_paths"/>
</provider>
提供您的路徑類型 path.xml
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path name="external_files" path="."/>
</paths>
並將此代碼添加到您的功能中
File file = new File(tempPathNameFileString);
Intent viewPdf = new Intent(Intent.ACTION_VIEW);
viewPdf.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
Uri URI = FileProvider.getUriForFile(ReportsActivity.this, ReportsActivity.this.getApplicationContext().getPackageName() + ".provider", file);
viewPdf.setDataAndType(URI, "application/pdf");
viewPdf.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
ReportsActivity.this.startActivity(viewPdf);
您可以直接使用此代碼它將打開所有類型的文件
Intent sharingIntent = new Intent(Intent.ACTION_VIEW);
Uri screenshotUri = Uri.fromFile(your_file);
sharingIntent.setType("image/png");
sharingIntent.putExtra(Intent.EXTRA_STREAM, screenshotUri);
String type = MimeTypeMap.getSingleton().getMimeTypeFromExtension(MimeTypeMap.getFileExtensionFromUrl(screenshotUri.toString()));
sharingIntent.setDataAndType(screenshotUri, type == null ? "text/plain" : type);
startActivity(Intent.createChooser(sharingIntent, "Share using"));
你可以試試這個
File file = new File(filePath);
MimeTypeMap map = MimeTypeMap.getSingleton();
String ext = MimeTypeMap.getFileExtensionFromUrl(file.getName());
String type = map.getMimeTypeFromExtension(ext);
if (type == null)
type = "*/*";
Intent intent = new Intent(Intent.ACTION_VIEW);
Uri data = Uri.fromFile(file);
intent.setDataAndType(data, type);
startActivity(intent);
要以編程方式在 Android 中打開文件,您可以使用以下代碼:- 我們使用 File Provider 進行內部文件訪問。您還可以在此鏈接fileprovidr1 , file provider2 , file provider3 中查看有關 File Provider 的詳細信息。 創建一個 File Provider 並在 Manifest File 中定義。
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="com.packagename.app.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths">
</meta-data>
</provider>
在資源文件中定義file_path 。
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path
name="my_images"
path="Android/data/com.packagename.app/files/Pictures" />
<external-files-path name="vivalinkComProp" path="Android/data/com.vivalink.app/vivalinkComProp/docs"/>
<external-path
name="external"
path="." />
<external-files-path
name="external_files"
path="." />
<cache-path
name="cache"
path="." />
<external-cache-path
name="external_cache"
path="." />
<files-path
name="files"
path="." />
</paths>
定義視圖意圖
String directory_path = Environment.getExternalStorageDirectory().getPath() + "/MyFile/";
String targetPdf = directory_path + fileName + ".pdf";
File filePath = new File(targetPdf);
Intent intentShareFile = new Intent(Intent.ACTION_VIEW);
File fileWithinMyDir = new File(targetPdf);
Uri bmpUri = FileProvider.getUriForFile(activity, "com.packagename.app.fileprovider", filePath);
if (fileWithinMyDir.exists()) {
intentShareFile.setDataAndType(bmpUri,"application/pdf");
intentShareFile.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intentShareFile.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(Intent.createChooser(intentShareFile, "Open File Using..."));
}
您可以使用不同的方式在 android 中創建文件提供程序。 希望這會幫助你。
MimeTypeMap.getSingleton().getExtensionFromMimeType(file.getName());
可能,這是最簡單的解決方案。
https://developer.android.com/reference/android/webkit/MimeTypeMap
private void openFile(File file) {
Uri uri = Uri.fromFile(file);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(uri, MimeTypeMap.getSingleton().getExtensionFromMimeType(file.getName()));
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(Intent.createChooser(intent, "Open " + file.getName() + " with ..."));
}
您可以使用 getContentResolver().getType(uri) 獲取任何文件 MIME 類型:
protected static void openFile(Context context, Uri localUri){
Intent i = new Intent(Intent.ACTION_VIEW);
i.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
i.setDataAndType(localUri, context.getContentResolver().getType(localUri));
context.startActivity(i);
}
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