W/System.err: java.io.FileNotFoundException: /mnt/sdcard/007.test: open failed: EACCES这个异常终于被我修复了

错误：

W/System.err: java.io.FileNotFoundException: /mnt/sdcard/007.test: open failed: EACCES (Permission denied)
W/System.err:     at libcore.io.IoBridge.open(IoBridge.java:496)
W/System.err:     at java.io.FileOutputStream.(FileOutputStream.java:235)
W/System.err:     at java.io.FileOutputStream.(FileOutputStream.java:157)
W/System.err:     at com.example.sdcardtest.MainActivity.save(MainActivity.java:41)
W/System.err:     at com.example.sdcardtest.MainActivity$1.onClick(MainActivity.java:32)
W/System.err:     at android.view.View.performClick(View.java:7284)
W/System.err:     at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1119)
W/System.err:     at android.view.View.performClickInternal(View.java:7258)
W/System.err:     at android.view.View.access$3600(View.java:831)
W/System.err:     at android.view.View$PerformClick.run(View.java:27948)
W/System.err:     at android.os.Handler.handleCallback(Handler.java:900)
W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:103)
W/System.err:     at android.os.Looper.loop(Looper.java:219)
W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:8401)
W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
W/System.err:     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1102)
W/System.err: Caused by: android.system.ErrnoException: open failed: EACCES (Permission denied)
W/System.err:     at libcore.io.Linux.open(Native Method)
W/System.err:     at libcore.io.ForwardingOs.open(ForwardingOs.java:167)
W/System.err:     at libcore.io.BlockGuardOs.open(BlockGuardOs.java:252)
W/System.err:     at libcore.io.ForwardingOs.open(ForwardingOs.java:167)
W/System.err:     at android.app.ActivityThread$AndroidOs.open(ActivityThread.java:8250)
W/System.err:     at libcore.io.IoBridge.open(IoBridge.java:482)
W/System.err:     ... 16 more

MainActivity代码：

package com.example.sdcardtest;import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;import java.io.BufferedOutputStream;
import java.io.BufferedWriter;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;public class MainActivity extends AppCompatActivity {private EditText edit;private Button mBtn;final String FILE_NAME = "/mnt/sdcard/007.test";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);edit =  findViewById(R.id.edit);mBtn = findViewById(R.id.btn);mBtn.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// 动态请求,设置请求码为1ActivityCompat.requestPermissions(MainActivity.this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},1);}});}@Overridepublic void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {super.onRequestPermissionsResult(requestCode, permissions, grantResults);if(requestCode == 1){for (int i = 0; i < permissions.length; i++) {if(grantResults[i] == PackageManager.PERMISSION_GRANTED){String input = edit.getText().toString();save(input);}else {Toast.makeText(this, "权限"+permissions[i]+"申请失败！！！", Toast.LENGTH_SHORT).show();}}}}public void save(String inputText) {FileOutputStream out = null;BufferedWriter writer = null;try {FileOutputStream fout = new FileOutputStream(FILE_NAME, true);BufferedOutputStream bout = new BufferedOutputStream(fout);bout.write(Integer.parseInt(inputText));bout.flush();bout.close();Toast.makeText(MainActivity.this,"保存成功！！！",Toast.LENGTH_LONG).show();} catch (IOException e) {e.printStackTrace();} finally {try {if (writer != null) {writer.close();}} catch (IOException e) {e.printStackTrace();}}}}

   在动态申请下，依然还是报错。让我非常苦恼！在网上找了好久好久，终于找到了解决办法。

就是在Manifest文件下的application下加入下面代码就解决了

android:requestLegacyExternalStorage="true"

参考文章：解决各版本安卓读写SD卡的问题-java.io.IOException: Operation not permitted问题_失落夏天的博客-CSDN博客_安卓11sd卡无法写入

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