W/System.err: java.io.IOException: Berechtigung verweigert beim Schreiben der Datei

Question

Ich versuche, eine Datei zu erstellen, um die von AudioRecord gesammelten Daten zu speichern. Aber wenn ich das tue, Android Studio zeigt mir, dass:

04-09 21:23:47.665 28293-28293/com.example.gongk.testfmcwv3 W/art: Before 
    Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable 
04-09 21:23:47.845 28293-28293/com.example.gongk.testfmcwv3 W/System.err: java.io.IOException: Permission denied 
04-09 21:23:47.846 28293-28293/com.example.gongk.testfmcwv3 W/System.err:  at java.io.UnixFileSystem.createFileExclusively0(Native Method) 
04-09 21:23:47.846 28293-28293/com.example.gongk.testfmcwv3 W/System.err:  at java.io.UnixFileSystem.createFileExclusively(UnixFileSystem.java:280) 
04-09 21:23:47.846 28293-28293/com.example.gongk.testfmcwv3 W/System.err:  at java.io.File.createNewFile(File.java:948) 
04-09 21:23:47.846 28293-28293/com.example.gongk.testfmcwv3 W/System.err:  at com.example.gongk.testfmcwv3.MainActivity.init(MainActivity.java:82) 
04-09 21:23:47.846 28293-28293/com.example.gongk.testfmcwv3 W/System.err:  at com.example.gongk.testfmcwv3.MainActivity.onCreate(MainActivity.java:63) 
04-09 21:23:47.846 28293-28293/com.example.gongk.testfmcwv3 W/System.err:  at android.app.Activity.performCreate(Activity.java:6912) 
04-09 21:23:47.846 28293-28293/com.example.gongk.testfmcwv3 W/System.err:  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1126) 
04-09 21:23:47.846 28293-28293/com.example.gongk.testfmcwv3 W/System.err:  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2900) 
04-09 21:23:47.846 28293-28293/com.example.gongk.testfmcwv3 W/System.err:  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3008) 
04-09 21:23:47.846 28293-28293/com.example.gongk.testfmcwv3 W/System.err:  at android.app.ActivityThread.-wrap14(ActivityThread.java) 
04-09 21:23:47.846 28293-28293/com.example.gongk.testfmcwv3 W/System.err:  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1650) 
04-09 21:23:47.846 28293-28293/com.example.gongk.testfmcwv3 W/System.err:  at android.os.Handler.dispatchMessage(Handler.java:102) 
04-09 21:23:47.846 28293-28293/com.example.gongk.testfmcwv3 W/System.err:  at android.os.Looper.loop(Looper.java:154) 
04-09 21:23:47.846 28293-28293/com.example.gongk.testfmcwv3 W/System.err:  at android.app.ActivityThread.main(ActivityThread.java:6688) 
04-09 21:23:47.846 28293-28293/com.example.gongk.testfmcwv3 W/System.err:  at java.lang.reflect.Method.invoke(Native Method) 
04-09 21:23:47.846 28293-28293/com.example.gongk.testfmcwv3 W/System.err:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468) 
04-09 21:23:47.846 28293-28293/com.example.gongk.testfmcwv3 W/System.err:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358) 
04-09 21:23:47.866 28293-28300/com.example.gongk.testfmcwv3 W/art: Suspending all threads took: 5.158ms 

Mein AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.example.gongk.testfmcwv3"> 

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

    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:roundIcon="@mipmap/ic_launcher_round" 
     android:supportsRtl="true" 
     android:theme="@style/AppTheme"> 

     <activity android:name=".MainActivity"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 

    </application> 

</manifest> 

Java-Code:

file = new File(Environment.getExternalStorageDirectory(),"TestFMCWR"); 
     if (file.exists()) file.delete(); 
     try { 
      file.createNewFile(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 

Ich kann nicht erklären, warum die Erlaubnis ist nicht arbeiten.

Answer 1

die Sie interessieren,

private Context mContext=YourActivity.this; 

    private static final int REQUEST = 112; 


    if (Build.VERSION.SDK_INT >= 23) { 
     String[] PERMISSIONS = {android.Manifest.permission.READ_EXTERNAL_STORAGE,android.Manifest.permission.WRITE_EXTERNAL_STORAGE}; 
     if (!hasPermissions(mContext, PERMISSIONS)) { 
      ActivityCompat.requestPermissions((Activity) mContext, PERMISSIONS, REQUEST); 
     } else { 
      //do here 
     } 
    } else { 
     //do here 
    } 

get Berechtigungen Ergebnis

@Override 
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { 
     super.onRequestPermissionsResult(requestCode, permissions, grantResults); 
     switch (requestCode) { 
      case REQUEST: { 
       if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { 
         //do here 
       } else { 
        Toast.makeText(mContext, "The app was not allowed to read your store.", Toast.LENGTH_LONG).show(); 
       } 
      } 
     } 
    } 

Kontrollberechtigungen für Eibisch

private static boolean hasPermissions(Context context, String... permissions) { 
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && context != null && permissions != null) { 
      for (String permission : permissions) { 
       if (ActivityCompat.checkSelfPermission(context, permission) != PackageManager.PERMISSION_GRANTED) { 
        return false; 
       } 
      } 
     } 
     return true; 
    } 

Manifest

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