我将于茫茫人海中访我唯一灵魂之伴侣；得之，我幸；不得，我命，如此而已。——徐志摩

安卓请求文件授权

在AndroidManifest.xml中加上

<!-- 往SDCard写入数据权限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<!-- 从SDCard读入数据权限 -->
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

image-20201023205450636

在启动的activity声明

//读写权限
public static String[] PERMISSIONS_STORAGE = {
        Manifest.permission.READ_EXTERNAL_STORAGE,
        Manifest.permission.WRITE_EXTERNAL_STORAGE};
//请求状态码
public static int REQUEST_PERMISSION_CODE = 1;

在下方onCreate里加上

if (Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP) {
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(this, PERMISSIONS_STORAGE, REQUEST_PERMISSION_CODE);
    }
}

最后重写onRequestPermissionsResult方法

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (requestCode == REQUEST_PERMISSION_CODE) {
        for (int i = 0; i < permissions.length; i++) {
            Log.i("MainActivity", "申请的权限为：" + permissions[i] + ",申请结果：" + grantResults[i]);
        }
    }
}

image-20201023205341141