AndroidStudio如何访问data/themes/0/descriptions.xml并且截取文件中的内容

Question

AndroidStudio中如何成功访问data/themes/0/descriptions.xml且询问用户给予全部文件访问权限并且截取两个之间的文本

Answer 1

以下回复参考：皆我百晓生、券券喵儿等免费微信小程序作答:

要在Android Studio中访问data/themes/0/descriptions.xml文件并截取其中的内容，你需要执行以下步骤：

1. 首先，确保你的应用具有读取外部存储的权限。在AndroidManifest.xml文件中添加以下权限：

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

1. 请求运行时权限。在你的Activity或Fragment中，检查是否已经获得了读取外部存储的权限。如果没有，请求用户授权：

private static final int REQUEST_READ_EXTERNAL_STORAGE = 1;

private void requestReadExternalStoragePermission() {
    if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)
            != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(this,
                new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                REQUEST_READ_EXTERNAL_STORAGE);
    } else {
        readDescriptionsFile();
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    if (requestCode == REQUEST_READ_EXTERNAL_STORAGE) {
        if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            readDescriptionsFile();
        } else {
            Toast.makeText(this, "需要读取外部存储权限", Toast.LENGTH_SHORT).show();
        }
    }
}

1. 读取descriptions.xml文件并截取其中的内容。你可以使用XmlPullParser来解析XML文件：

private void readDescriptionsFile() {
    try {
        File file = new File(Environment.getExternalStorageDirectory(), "data/themes/0/descriptions.xml");
        XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
        XmlPullParser parser = factory.newPullParser();
        InputStream inputStream = new FileInputStream(file);
        parser.setInput(inputStream, null);

        StringBuilder titleBuilder = new StringBuilder();
        StringBuilder titleCnBuilder = new StringBuilder();
        StringBuilder authorBuilder = new StringBuilder();

        int eventType = parser.getEventType();
        while (eventType != XmlPullParser.END_DOCUMENT) {
            String tagName = parser.getName();
            switch (eventType) {
                case XmlPullParser.START_TAG:
                    if (tagName.equals("title")) {
                        titleBuilder.append(parser.nextText());
                    } else if (tagName.equals("title-cn")) {
                        titleCnBuilder.append(parser.nextText());
                    } else if (tagName.equals("author")) {
                        authorBuilder.append(parser.nextText());
                    }
                    break;
            }
            eventType = parser.next();
        }

        String title = titleBuilder.toString().trim();
        String titleCn = titleCnBuilder.toString().trim();
        String author = authorBuilder.toString().trim();

        // 在这里处理截取到的文本内容，例如显示在TextView中
        TextView titleTextView = findViewById(R.id.titleTextView);
        TextView titleCnTextView = findViewById(R.id.titleCnTextView);
        TextView authorTextView = findViewById(R.id.authorTextView);

        titleTextView.setText(title);
        titleCnTextView.setText(titleCn);
        authorTextView.setText(author);

    } catch (IOException | XmlPullParserException e) {
        e.printStackTrace();
    }
}

1. 在适当的时机调用requestReadExternalStoragePermission()方法，例如在onCreate()方法中或者在用户点击某个按钮时。