Unity Android（七） Unity Android10读写权限

PS：Android10读取权限发生了变化，即使应用权限里有读写权限可能也无法进行读写，主要是

需要 android:requestLegacyExternalStorage="true"

//AndroidManifest.xml中

读写文件需要在AndroidManifest.xml中增加权限

动态申请权限如下：

package com.example.myapplication;

import static android.content.pm.PackageManager.PERMISSION_GRANTED;

import androidx.appcompat.app.AppCompatActivity;

import android.Manifest;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.provider.Settings;
import android.util.Log;

import com.unity3d.player.UnityPlayerActivity;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class MainActivity extends UnityPlayerActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);
    }
    

    //动态申请权限
    public   boolean requestPermission() {
        
        boolean isGranted = true;
        if (android.os.Build.VERSION.SDK_INT >= 23) {
            if (this.checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) != PERMISSION_GRANTED) {
                //如果没有写sd卡权限
                isGranted = false;
            }
            if (!isGranted) {
                
                this.requestPermissions(
                        new String[]{
                                Manifest.permission.READ_EXTERNAL_STORAGE,
                                Manifest.permission.WRITE_EXTERNAL_STORAGE
                        },
                        200);
            }
        }
        return isGranted;
    }

    //创建文件-测试方法
    public void CreatFile()
    {
        //Environment.getExternalStoragePublicDirectory("").toString()  //"/storage/emulated/0"
        String filePath = "/storage/emulated/0/Android/text33.txt";
        File file = new File(filePath);
        try {
            if(!file.exists())
                file.createNewFile();
            FileOutputStream fos1 = new FileOutputStream(filePath);
            String content="测试33";
            fos1.write(content.getBytes());
            fos1.flush();
            fos1.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


}

AndroidManifest.xml

如果不太懂UnityPlayerActivity或打包aar请参考我的文章

Unity里调用如下：

//创建文件
 string filepath = "/storage/emulated/0/Android/text33.txt";
        button2.onClick.AddListener(() =>
        {
            AndroidJavaClass ajc = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
            AndroidJavaObject jcontext = ajc.GetStatic("currentActivity");
            jcontext.Call("CreatFile", filepath);
            
        });



//请求权限
button4.onClick.AddListener(() =>
        {
            AndroidJavaClass ajc = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
            AndroidJavaObject jcontext = ajc.GetStatic("currentActivity");
            bool result= jcontext.Call("checkPermission");
            Debug.LogError("请求权限:"+ result);
        });


//读取文件

 byte[] byt=File.ReadAllBytes(filepath);
 String str=File.ReadAllText(filepath);

附：Unity2019开始可以直接从Unity里请求权限，调用方式如下。亲测可用

using UnityEngine.Android;






Permission.RequestUserPermission("android.permission.WRITE_EXTERNAL_STORAGE");

AndroidManifest.xml里也需要声明一下权限清单

参考文章：

1. https://blog.csdn.net/msn465780/article/details/119057483 android 关于requestLegacyExternalStorage的使用

2. https://blog.csdn.net/u012539700/article/details/114930137?Android R(11)文件读写适配