解决设置Android 23.0以上版本对SD卡的读写权限无效的问题（转载）
转载自：https://www.2cto.com/kf/201707/653938.html
解决设置Android 23.0以上版本对SD卡的读写权限无效的问题。对Android的SD卡进行读取权限设置时：
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<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE">
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission></uses-permission>
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结果报错：
依然提示没有权限，百度说是版本问题，23.0版本（笔者的版本是25.0）以上的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：
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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：
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//检测读写权限PermisionUtils.verifyStoragePermissions(this);
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程序运行的时候，会询问是否授权