我正在创建一个 android 应用程序。我必须在其中下载和查看 pdf 文件。当我在模拟器中运行我的应用程序时，如果我选择下载它是空闲的，如果我选择查看它会被重定向到 adobe reader 但它显示“文档路径无效”。我错过了什么？
Screen8.java
package com.example.library;
import java.io.File;
import java.io.IOException;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
public class Screen8 extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_screen8);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.screen8, menu);
return true;
}
public void download(View v)
{
new DownloadFile().execute("http://maven.apache.org/maven-1.x/maven.pdf", "maven.pdf");
}
public void view(View v)
{
File pdfFile = new File(Environment.getExternalStorageDirectory() + "/testthreepdf/" + "maven.pdf"); // -> filename = maven.pdf
Uri path = Uri.fromFile(pdfFile);
Intent pdfIntent = new Intent(Intent.ACTION_VIEW);
pdfIntent.setDataAndType(path, "application/pdf");
pdfIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
try{
startActivity(pdfIntent);
}catch(ActivityNotFoundException e){
Toast.makeText(Screen8.this, "No Application available to view PDF", Toast.LENGTH_SHORT).show();
}
}
private class DownloadFile extends AsyncTask<String, Void, Void>{
@Override
protected Void doInBackground(String... strings) {
String fileUrl = strings[0]; // -> http://maven.apache.org/maven-1.x/maven.pdf
String fileName = strings[1]; // -> maven.pdf
String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
File folder = new File(extStorageDirectory, "testthreepdf");
folder.mkdir();
File pdfFile = new File(folder, fileName);
try{
pdfFile.createNewFile();
}catch (IOException e){
e.printStackTrace();
}
FileDownloder.downloadFile(fileUrl, pdfFile);
return null;
}
}
}
文件下载器.java
package com.example.library;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class FileDownloder {
private static final int MEGABYTE = 1024 * 1024;
public static void downloadFile(String fileUrl, File directory){
try {
URL url = new URL(fileUrl);
HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection();
//urlConnection.setRequestMethod("GET");
//urlConnection.setDoOutput(true);
urlConnection.connect();
InputStream inputStream = urlConnection.getInputStream();
FileOutputStream fileOutputStream = new FileOutputStream(directory);
int totalSize = urlConnection.getContentLength();
byte[] buffer = new byte[MEGABYTE];
int bufferLength = 0;
while((bufferLength = inputStream.read(buffer))>0 ){
fileOutputStream.write(buffer, 0, bufferLength);
}
fileOutputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
安卓 list .xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.library"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" >
</uses-permission>
<uses-permission android:name="android.permission.READ_PHONE_STATE" >
</uses-permission>
<uses-sdk
android:minSdkVersion="17"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/icon"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".Screen1"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Screen2"
android:label="@string/title_activity_screen2"
android:parentActivityName=".Screen1" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.
library.Screen1" />
</activity>
<activity
android:name=".Screen3"
android:label="@string/title_activity_screen3"
android:parentActivityName=".Screen2" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.library.Screen2" />
</activity>
<activity
android:name=".Second"
android:label="@string/title_activity_second" >
</activity>
<activity
android:name=".Screen4"
android:label="@string/title_activity_screen4"
android:parentActivityName=".Screen3" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.library.Screen3" />
</activity>
<activity
android:name=".Screen5"
android:label="@string/title_activity_screen5"
android:parentActivityName=".Screen4"
android:screenOrientation="portrait" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.library.Screen4" />
</activity>
<activity
android:name=".Screen6"
android:label="@string/title_activity_screen6" >
</activity>
<activity
android:name=".Screen7"
android:label="@string/title_activity_screen7" >
</activity>
<activity
android:name=".Screen5ii"
android:label="@string/title_activity_screen5ii" >
</activity>
<activity
android:name=".Screen5iii"
android:label="@string/title_activity_screen5iii" >
</activity>
<activity
android:name=".Screen5iv"
android:label="@string/title_activity_screen5iv" >
</activity>
<activity
android:name=".Screen8"
android:label="@string/title_activity_screen8" >
</activity>
<activity
android:name=".FileDownloader"
android:label="@string/title_activity_file_downloader" >
</activity>
</application>
</manifest>
Activity 屏幕8.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.library.Screen8" >
<Button
android:id="@+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="15dp"
android:text="download"
android:onClick="download" />
<Button
android:id="@+id/button2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/button1"
android:layout_marginTop="38dp"
android:text="view"
android:onClick="view" />
</RelativeLayout>
我的日志猫
03-21 03:55:53.492: W/System.err(1571): java.io.IOException: open failed: EACCES (Permission denied)
03-21 03:55:53.522: W/System.err(1571): at java.io.File.createNewFile(File.java:946)
03-21 03:55:53.532: W/System.err(1571): at com.example.library.Screen8$DownloadFile.doInBackground(Screen8.java:66)
03-21 03:55:53.552: W/System.err(1571): at com.example.library.Screen8$DownloadFile.doInBackground(Screen8.java:1)
03-21 03:55:53.572: W/System.err(1571): at android.os.AsyncTask$2.call(AsyncTask.java:288)
03-21 03:55:53.592: W/System.err(1571): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
03-21 03:55:53.592: W/System.err(1571): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
03-21 03:55:53.632: W/System.err(1571): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
03-21 03:55:53.642: W/System.err(1571): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
03-21 03:55:53.652: W/System.err(1571): at java.lang.Thread.run(Thread.java:841)
03-21 03:55:53.672: W/System.err(1571): Caused by: libcore.io.ErrnoException: open failed: EACCES (Permission denied)
03-21 03:55:53.702: W/System.err(1571): at libcore.io.Posix.open(Native Method)
03-21 03:55:53.712: W/System.err(1571): at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
03-21 03:55:53.732: W/System.err(1571): at java.io.File.createNewFile(File.java:939)
03-21 03:55:53.732: W/System.err(1571): ... 8 more
03-21 03:55:54.382: D/dalvikvm(1571): GC_FOR_ALLOC freed 268K, 8% free 4302K/4636K, paused 165ms, total 166ms
03-21 03:56:06.272: W/System.err(1571): java.io.FileNotFoundException: /storage/sdcard/testthreepdf/maven.pdf: open failed: EACCES (Permission denied)
03-21 03:56:06.292: W/System.err(1571): at libcore.io.IoBridge.open(IoBridge.java:409)
03-21 03:56:06.292: W/System.err(1571): at java.io.FileOutputStream.<init>(FileOutputStream.java:88)
03-21 03:56:06.302: W/System.err(1571): at java.io.FileOutputStream.<init>(FileOutputStream.java:73)
03-21 03:56:06.322: W/System.err(1571): at com.example.library.FileDownloder.downloadFile(FileDownloder.java:26)
03-21 03:56:06.322: W/System.err(1571): at com.example.library.Screen8$DownloadFile.doInBackground(Screen8.java:70)
03-21 03:56:06.332: W/System.err(1571): at com.example.library.Screen8$DownloadFile.doInBackground(Screen8.java:1)
03-21 03:56:06.332: W/System.err(1571): at android.os.AsyncTask$2.call(AsyncTask.java:288)
03-21 03:56:06.332: W/System.err(1571): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
03-21 03:56:06.332: W/System.err(1571): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
03-21 03:56:06.332: W/System.err(1571): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
03-21 03:56:06.372: W/System.err(1571): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
03-21 03:56:06.372: W/System.err(1571): at java.lang.Thread.run(Thread.java:841)
03-21 03:56:06.382: W/System.err(1571): Caused by: libcore.io.ErrnoException: open failed: EACCES (Permission denied)
03-21 03:56:06.412: W/System.err(1571): at libcore.io.Posix.open(Native Method)
03-21 03:56:06.412: W/System.err(1571): at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
03-21 03:56:06.422: W/System.err(1571): at libcore.io.IoBridge.open(IoBridge.java:393)
03-21 03:56:06.422: W/System.err(1571): ... 11 more
03-21 03:56:25.982: W/EGL_emulation(1571): eglSurfaceAttrib not implemented
最佳答案
对于 View，这应该对您有所帮助。
private void loadDocInReader(String doc) throws ActivityNotFoundException, Exception {
try {
Intent intent = new Intent();
intent.setPackage("com.adobe.reader");
intent.setDataAndType(Uri.parse(doc), "application/pdf");
startActivity(intent);
} catch (ActivityNotFoundException activityNotFoundException) {
activityNotFoundException.printStackTrace();
throw activityNotFoundException;
} catch (Exception otherException) {
otherException.printStackTrace();
throw otherException;
}
}
关于java - android模拟器中的文档路径无效错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29180130/