java.io.FileNotFoundException: Permission denied 错误解决方法

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在android6.0以后，需要runtime权限：requestPermissions方法。

具体如下：

  private static final int REQUEST_EXTERNAL_STORAGE = 1;    private static String[] PERMISSIONS_STORAGE = {            Manifest.permission.READ_EXTERNAL_STORAGE,            Manifest.permission.WRITE_EXTERNAL_STORAGE    };

 //获取动态权限        int hasWriteContactsPermission = ContextCompat.checkSelfPermission(MainActivity.this,                Manifest.permission.READ_EXTERNAL_STORAGE);//android.manifest.xml        if (hasWriteContactsPermission != PackageManager.PERMISSION_GRANTED) {            if (!ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this,                    Manifest.permission.READ_EXTERNAL_STORAGE)) {                Log.d("yx","get permission");                ActivityCompat.requestPermissions(MainActivity.this,                        PERMISSIONS_STORAGE,                        REQUEST_EXTERNAL_STORAGE);            }            Log.d("yx","get permission2");            ActivityCompat.requestPermissions(MainActivity.this,                    PERMISSIONS_STORAGE,                    REQUEST_EXTERNAL_STORAGE);        }        Log.d("yx","wait for PERMISSION_GRANTED");        while (( ContextCompat.checkSelfPermission(MainActivity.this,                Manifest.permission.READ_EXTERNAL_STORAGE))!= PackageManager.PERMISSION_GRANTED) {        }       Log.d("yx","wait for PERMISSION_GRANTED finish");

还需要加入android-support-v4.jar库。就可以或许android6.0以上的SD卡权限了。

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