API level22下SD卡写入读取权限

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SDK min 18 , compile with 25,运行在22的 AVD下,虽然在manifest文件下写了权限

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

但是实际运行中仍然被拒绝:提示

open failed: EACCES (Permission denied)

需要在使用权限之前询问:

 // Storage Permissions    private static final int REQUEST_EXTERNAL_STORAGE = 1;    private static String[] PERMISSIONS_STORAGE = {            Manifest.permission.READ_EXTERNAL_STORAGE,            Manifest.permission.WRITE_EXTERNAL_STORAGE    };    /**     * Checks if the app has permission to write to device storage     *     * If the app does not has permission then the user will be prompted to grant permissions     *     * @param activity     */    public static void verifyStoragePermissions(Activity activity) {        // Check if we have write permission        int permission = ActivityCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE);        if (permission != PackageManager.PERMISSION_GRANTED) {            // We don't have permission so prompt the user            ActivityCompat.requestPermissions(                    activity,                    PERMISSIONS_STORAGE,                    REQUEST_EXTERNAL_STORAGE            );        }    }

在使用前调用verifyStoragePermission方法,暂时解决了. (在stackoverflow看到的解决方法之一,使用有效)

2017 .1.11

实际上就这三行代码

 int code = checkSelfPermission("android.permission.READ_CONTACTS");        if(code!= PackageManager.PERMISSION_GRANTED)            requestPermissions(new String[]{"android.permission.READ_CONTACTS"},1);

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