快速解决安卓7.0系统写入SD卡权限失败的问题
如图所示,在mainfest文件中声明了SD卡的读和写权限,仍旧报错:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>
安卓23.0版本以上,不仅仅要设置上面的权限,还要在对SD卡有读写操作的地方授权,下面是公共类:
import android.Manifest; import android.app.Activity; import android.content.pm.PackageManager; import android.support.v4.app.ActivityCompat; public class PermisionUtils { // 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); } } }
然后直接在需要授权的地方调用:
verifyStoragePermissions(this);
this指的是当前的Activity,程序运行会出现以下结果:
点击ALLOW之后,程序获取SD卡读写权限,就算你把代码里的
verifyStoragePermissions(this);语句删了,只要不卸载应用程序,权限就仍然存在。
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