Android：在外部存储中创建新文件时，权限被拒绝

Question

I am trying to write a file to the external storage location on Android. Here is my code :

String state = Environment.getExternalStorageState();

if(Environment.MEDIA_MOUNTED.equals(state)) {
     saveState= true;
     File pPath= Environment.getExternalStorageDirectory();

     if(!pPath.exists()) {
          boolean bReturn= pPath.mkdirs();
          Log.d(TAG, "mkdirs returned: " + bReturn);
     }
     try {
          File pFile= new File(pPath, "output.pcm");
          pFile.createNewFile();
          outputLocation= pFile.getAbsolutePath().toString();
     } catch (IOException e) {
          Log.d(TAG, "Could not create file: " + e.toString());
          saveState= false;
     }
} // end if we can read/write to the external storage

The call to createNewFile() returns "Could not create file: java.io.IOException: Permission denied"

I have the android.permission.WRITE_EXTERNAL_STORAGE in my manifest file. There seems to be a ton of questions about this problem, and this solved most of them, but I am still having this issue. Here is part of the manifest:

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="company.example.sample"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="10" />
    <permission android:name="android.permission.RECORD_AUDIO"></permission>
    <permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"></permission>
    <permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></permission>

Any ideas?

Answer 1

Replace your <permission> elements with <uses-permission> elements:

<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

<permission> defines a new permission; <uses-permission> indicates you want to hold a permission.