华为手机读写SD卡，加了权限创建文件还是报错，求指导。在线等

[ijackson]

RT添加了权限，创建文件的时候还是报错，别的手机没有问题，现在手上的华为P9不行，具体如下：

添加的权限：
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />

----------------------
代码如下：
String state = Environment.getExternalStorageState();
if (state.equals(Environment.MEDIA_MOUNTED)) {
file = new File(saveDir, "temp.jpg");
file.delete();
File dir = new File(saveDir);
if(!dir.exists()) {
dir.mkdirs();
}
if (!file.exists()) {
try {
file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(ReportActivity.this, "照片创建失败!",
Toast.LENGTH_LONG).show();
return;
}
}
-------------------------
异常信息：
java.io.IOException: open failed: ENOENT (No such file or directory)
07-17 10:57:31.275 9327-9327/com.jackson.spdtreport W/System.err: at java.io.File.createNewFile(File.java:942)

[ijackson]

太感谢楼上了，这个问题终于解决了，跪谢！

[网易云捕]

华为P9是android 6.0 的== 在API23+以上也就是安卓6.0以上的，进行了权限管理 不止要在AndroidManifest.xml里面添加权限 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 还要在JAVA代码中运行时实时请求权限： // 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); } }

[a547694946]

引用 1 楼 crash163 的回复:

华为P9是android 6.0 的== 在API23+以上也就是安卓6.0以上的，进行了权限管理 不止要在AndroidManifest.xml里面添加权限 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 还要在JAVA代码中运行时实时请求权限： // 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); } }

解决了困扰很久的问题 非常感谢

[c小旭]

引用 1 楼 crash163 的回复:

华为P9是android 6.0 的== 在API23+以上也就是安卓6.0以上的，进行了权限管理 不止要在AndroidManifest.xml里面添加权限 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 还要在JAVA代码中运行时实时请求权限： // 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); } }

非常感谢，找了半天这个问题，终于解决了。

[神兽已失踪]

引用 1 楼 crash163 的回复:

华为P9是android 6.0 的== 在API23+以上也就是安卓6.0以上的，进行了权限管理 不止要在AndroidManifest.xml里面添加权限 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 还要在JAVA代码中运行时实时请求权限： // 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); } }

现在我用的华为n8 使用这个方法之后会弹出一个提示 第一次禁止之后 再次打开就永远不好使了 只能重新安装. 这要怎么解决啊

[神兽已失踪]

用这个方法之后应用会关闭,需要重新打开才可以.这可以解决吗

[Lucien0623]

但是我targetSdkVersion没有23+ 不是应该默认有这些权限的吗 不应该报错才对啊

[瓶子君i]

引用 1 楼 crash163 的回复:

华为P9是android 6.0 的== 在API23+以上也就是安卓6.0以上的，进行了权限管理 不止要在AndroidManifest.xml里面添加权限 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 还要在JAVA代码中运行时实时请求权限： // 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); } }

非常感谢，很有用；

[wzx12121]

怎么使用啊楼主