使用Android WebView和JS写入本地文件

I am working on an android app that should write to a local file on device. A simple txt file. But i want to do this via the web view + javascript feature. In my activity I have a button which points to a URL. When user taps it, it requests a json file. I want to write this blob to disk in the javascript part of the app itself. Is there a way to do this ?

我正在开发一个应该写入设备上本地文件的Android应用程序。一个简单的txt文件。但我想通过网络视图+ javascript功能这样做。在我的活动中,我有一个指向URL的按钮。当用户点击它时,它会请求一个json文件。我想在应用程序本身的javascript部分将此blob写入磁盘。有没有办法做到这一点 ?

1 个解决方案

#1

I'm not quite sure what you mean by the javascript part. If you are in an Android app, you should have access to a Context. If you have any Context, you can do IO:

我不太确定你的javascript部分是什么意思。如果您使用的是Android应用,则应该可以访问上下文。如果你有任何Context,你可以做IO:

private String read(String fn)
{
    try {
        FileInputStream mInput = {{CONTEXT}}.openFileInput(fn);
        byte[] data = new byte[128];
        mInput.read(data);
        mInput.close();
        String display = new String(data);
        return display.trim();
    } catch (IOException | NullPointerException e) {
        e.printStackTrace();
        return ERROR;
    }
}

private void write(String fn, String data)
{
    try {
        FileOutputStream mOutput = {{CONTEXT}}.openFileOutput(fn);
        mOutput.write(data.getBytes());
        mOutput.flush();
        mOutput.close();
    } catch (IOException | NullPointerException e) {
        e.printStackTrace();
    }
}