Question

我的项目上有一个资产文件，文件包含html代码现在我想通过字符串在Bellow代码上获取这些代码所以请帮助我我如何在Bellow代码中的字符串中读取资产文件

public class StartPage {

      final String FILENAME = data();

    private static final String HEAD_1 = "<!DOCTYPE html><html xmlns=\"http://www.w3.org/1999/xhtml\">"
            + "<head>"
            + "<meta content=\"en-us\" http-equiv=\"Content-Language\" />"
            + "<meta content=\"text/html; charset=utf-8\" http-equiv=\"Content-Type\" />"
            + "<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no\">"
            + "<title>";


    @NonNull
    public static File getStartPageFile(@NonNull Application application) {
        return new File(application.getFilesDir(), FILENAME);
    }

    @NonNull private final String mTitle;

    @Inject Application mApp;
    @Inject SearchEngineProvider mSearchEngineProvider;

    public StartPage() {
        BrowserApp.getAppComponent().inject(this);
        mTitle = mApp.getString(R.string.home);
    }

    @NonNull
    public Single<String> getHomepage() {
        return Single.create(new SingleAction<String>() {
            @Override
            public void onSubscribe(@NonNull SingleSubscriber<String> subscriber) {

                StringBuilder homepageBuilder = new StringBuilder(HEAD_1 + mTitle );

                BaseSearchEngine currentSearchEngine = mSearchEngineProvider.getCurrentSearchEngine();

                String icon = currentSearchEngine.getIconUrl();
                String searchUrl = currentSearchEngine.getQueryUrl();

                homepageBuilder.append(icon);

                homepageBuilder.append(searchUrl);


                File homepage = getStartPageFile(mApp);
                FileWriter hWriter = null;
                try {
                    //noinspection IOResourceOpenedButNotSafelyClosed
                    hWriter = new FileWriter(homepage, false);
                    hWriter.write(homepageBuilder.toString());
                } catch (IOException e) {
                    e.printStackTrace();
                } finally {
                    Utils.close(hWriter);
                }

                subscriber.onItem(Constants.FILE + homepage);

            }
        });
     private String data(){
        InputStream inputStream = getAsseet().openRawResource(R.raw.database);
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();

        int i;
        try {
            i = inputStream.read();
            while (i != -1)
            {
                byteArrayOutputStream.write(i);
                i = inputStream.read();
            }
            inputStream.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return byteArrayOutputStream.toString();
    }
 }

}

我在这里尝试阅读资产文件，但这里给出错误（不能解析方法getAsset（））所以请通过编写代码来帮助我谢谢奥斯曼

Answer 1

getAssets()是类Context的方法。在“活动”中，您只能调用getAssets()，因为它被视为this.getAssets()，而活动是Context的子类。这就是为什么你可以在Activty中调用它的原因。由于您的班级不是Context的子类，因此您无法在班级中调用getAssets()或this.getAssets()，因为没有此类方法。

所以现在你必须得到一些Context才能打电话给getAssets()。您有Application mApp;的实例，它是Context的子类以及Activty。所以你可以致电mApp.getAssets()

Answer 2

请使用以下代码。希望这会奏效！

String convertedString = loadJSONFromAsset(context,"myfile.html");
Log.d("converstion" ,"converted string" + convertedString ); // it will print the entire file as string.

public String loadJSONFromAsset(Context context,String fileName) {
        String json = null;
        try {
            InputStream is = context.getAssets().open("foldername/" + fileName);
            int size = is.available();
            byte[] buffer = new byte[size];
            is.read(buffer);
            is.close();
            json = new String(buffer, "UTF-8");
        } catch (IOException ex) {
            ex.printStackTrace();
            return null;
        }
        return json;
    }

在非Activity类android中读取资产文件

2 个答案: