android 动态获取权限2， 便利 文件夹里的文件

第一步 最重要了， build.gradle 里 修改
targetSdk 29 不改不行啊

    <!-- 网络权限 -->
    <uses-permission android:name="android.permission.INTERNET" /> <!-- 写入外部存储权限 -->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <!-- 读取外部存储权限 -->
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
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  <provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="com.baiwen.www.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths" />
        </provider>
    </application>
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file_paths.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <paths>
        <external-path
            name="mypdf"
            path="mypdf/" />
    </paths>
</resources>
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requestMyPermissions();

/***
     * 动态申请  读写权限-------------------------------------

     * 版权声明：本文为CSDN博主「路过独木桥！！」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
     * 原文链接：https://blog.csdn.net/wq892373445/article/details/104427185/
     */

    private void requestMyPermissions() {

        if (ContextCompat.checkSelfPermission(this,
                Manifest.permission.WRITE_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED) {
            //没有授权，编写申请权限代码
            ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 100);
        } else {
            Log.d("tag", "requestMyPermissions: 有写SD权限");
        }
        if (ContextCompat.checkSelfPermission(this,
                Manifest.permission.READ_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED) {
            //没有授权，编写申请权限代码
            ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 100);
        } else {
            Log.d("tag", "requestMyPermissions: 有读SD权限");
        }
    }
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