按照老师原代码敲出来的依然没有权限依然报错

W/System.err: java.io.FileNotFoundException: /storage/sdcard0/info.text: open failed: EACCES (Permission denied)

得知6.0以上版本需要 重新获取动态权限

试了一下方法

https://blog.csdn.net/wuqingyou_w/article/details/60138807

此方法测试依然报错

又重新试了另一种方法

https://blog.csdn.net/qq_35649072/article/details/105440376

这两个方法依然提示报错

当前源码如下

 package ymbky.example.qqdemotest;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import android.app.Activity;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.nio.charset.StandardCharsets;

public class SDCardDemoActivity extends Activity implements View.OnClickListener{

    private static final String TAG1 = "SDCardDemoActivity";
    private Button mwriteDataBtn;

//    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();
//        }
//    }


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sdcard_demo);
//        verifyStoragePermissions(this);
        mwriteDataBtn= this.findViewById(R.id.write_data_2_sd_card_btn);
        mwriteDataBtn.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
       if (v==mwriteDataBtn){
           File filePath=new File("/storage/sdcard0");
           File file=new File(filePath,"info.text");
           try {

//               if (!file.exists()){
//               file.createNewFile();
//           }

               FileOutputStream fos=new FileOutputStream(file);
               fos.write(("LLLLLLLL").getBytes(StandardCharsets.UTF_8));
               fos.flush();
               fos.close();
               Log.d(TAG1,"写入成功");
           } catch (Exception e) {
               e.printStackTrace();
           }
       }
    }
}

我把自己添加的全部注释掉了，现在该怎么改才才能获得动态权限读取写入的功能

把 Androidmanifest 里面要修改的改成

<uses-permission-sdk-23 android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission-sdk-23 android:name="android.permission.READ_EXTERNAL_STORAGE"/>

依然不行