java.io.filenotfoundexeption：/storage/sdcard/app.apk打開失敗EACCES（拒絕）

Question

我想從我的應用程序到外部存儲的去包複製我的APK文件：

級副本：

在mainactivity裏面clicklistener我的方法的

package com.pfe.bls; 

import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.nio.channels.FileChannel; 

import android.os.Environment; 

public class Copyapk { 
    public static void copy() throws IOException { 
     String baseDir = Environment.getExternalStorageDirectory().getAbsolutePath(); 
     String fileName = "app.apk"; 
     FileInputStream inStream = new FileInputStream("/data/data/com.pfe.bls/app.apk"); 
     FileOutputStream outStream = new FileOutputStream(baseDir + File.separator + fileName); 
     FileChannel inChannel = inStream.getChannel(); 
     FileChannel outChannel = outStream.getChannel(); 
     inChannel.transferTo(0, inChannel.size(), outChannel); 
     inStream.close(); 
     outStream.close(); 
    } 

} 

L'APPEL：

：

btn_createApp.setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View v) { 
    try { 
        Copyapk.copy(); 
       } catch (IOException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 
      } 
     }); 

在Android清單權限

<uses-permission android:name="android.permissions.WRITE_EXTERNAL_STORAGE" /> 
    <uses-permission android:name="android.permission.INTERNET" /> 
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> 
    <uses-permission android:name="com.android.vending.BILLING" /> 
    <uses-permission android:name="android.permission.MOUNT_FORMAT_FILESYSTEMS" /> 

Answer 1

您的數據文件夾存儲在哪裏？ 它在外部存儲或應用程序存儲中。從應用程序存儲目錄訪問它，你應該使用使用以下

PackageManager m = getPackageManager(); 
String s = getPackageName(); 
try { 
    PackageInfo p = m.getPackageInfo(s, 0); 
    s = p.applicationInfo.dataDir; 
    } catch (NameNotFoundException e) { 
    Log.w("yourtag", "Error not found ", e); 
    }