在使用webview开发的应用程序中访问手机存储

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

// 获取手机存储的根目录路径
String storagePath = Environment.getExternalStorageDirectory().getAbsolutePath();

// 在指定路径下创建文件夹
File folder = new File(storagePath + "/myFolder");
if (!folder.exists()) {
    folder.mkdirs();
}

// 在指定路径下创建文件
File file = new File(storagePath + "/myFolder/myFile.txt");
try {
    file.createNewFile();
} catch (IOException e) {
    e.printStackTrace();
}

// 读取文件内容
try {
    FileInputStream fis = new FileInputStream(file);
    InputStreamReader isr = new InputStreamReader(fis);
    BufferedReader br = new BufferedReader(isr);
    String line;
    StringBuilder content = new StringBuilder();
    while ((line = br.readLine()) != null) {
        content.append(line);
    }
    br.close();
    isr.close();
    fis.close();
    // 处理文件内容
} catch (IOException e) {
    e.printStackTrace();
}

// 写入文件内容
try {
    FileOutputStream fos = new FileOutputStream(file);
    OutputStreamWriter osw = new OutputStreamWriter(fos);
    BufferedWriter bw = new BufferedWriter(osw);
    bw.write("Hello, World!");
    bw.close();
    osw.close();
    fos.close();
} catch (IOException e) {
    e.printStackTrace();
}

// 加载手机存储中的HTML文件
String filePath = storagePath + "/myFolder/myFile.html";
webView.loadUrl("file://" + filePath);