文件读写权限

自己研究了一下，具体做法是在AndroidManifest文件中添加一行代码，

\<uses-permission android:name="android.permission.INTERNET" /\>

添加的地方如下图：![] (39A6BB2C18370B586E27D1FD9FCCB8ED.jpg)

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

     \<!-- 开启网络访问权限 --\>
     \<uses-permission android:name="android.permission.INTERNET"\>
     \</uses-permission\>

     \<!-- 允许访问网络状态的权限 --\>
     \<uses-permission android:name="android.permission.ACCESS\_NETWORK\_STATE"/\>

     \<!-- 允许访问wifi状态的权限 --\>
     \<uses-permission android:name="android.permission.ACCESS\_WIFI\_STATE"/\>

     \<!-- 允许修改网络状态的权限 --\>
     \<uses-permission android:name="android.permission.CHANGE\_NETWORK\_STATE"\>
     \</uses-permission\>

     \<!-- 允许修改wifi状态的权限 --\>
     \<uses-permission android:name="android.permission.CHANGE\_WIFI\_STATE"/\>

     \<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/Theme.MyJava"\>

     \<activity
     android:name=".MainActivity"
     android:label="@string/app\_name"
     android:theme="@style/Theme.MyJava.NoActionBar"\>
     \<intent-filter\>
     \<action android:name="android.intent.action.MAIN" /\>

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

    \</manifest\>

1 静态修改： AndroidManifest中添加SD卡读写的权限

> \<uses-permission android:name="android.permission.WRITE\_EXTERNAL\_STORAGE"/\>
> 
> \<uses-permission android:name="android.permission.READ\_EXTERNAL\_STORAGE"/\>

2 动态修改：java判断并获取权限

> private static final int REQUEST\_EXTERNAL\_STORAGE = 1;
> 
> private static String[] PERMISSIONS\_STORAGE = {
> 
> "android.permission.READ\_EXTERNAL\_STORAGE",
> 
> "android.permission.WRITE\_EXTERNAL\_STORAGE" };
> 
> public static void verifyStoragePermissions(Activity activity) {
> 
> try {
> 
> //检测是否有写的权限
> 
> int permission = ActivityCompat.checkSelfPermission(activity,
> 
> "android.permission.WRITE\_EXTERNAL\_STORAGE");
> 
> if (permission != PackageManager.PERMISSION\_GRANTED) {
> 
> // 没有写的权限，去申请写的权限，会弹出对话框
> 
> ActivityCompat.requestPermissions(activity, PERMISSIONS\_STORAGE,REQUEST\_EXTERNAL\_STORAGE);
> 
> }
> 
> } catch (Exception e) {
> 
> e.printStackTrace();
> 
> }
> 
> }

作者：山猪cn 来源：简书 著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。