read file from assets

Question

public class Utils {
    public static List getMessages() {
        //File file = new File(\"file:///android_asset/helloworld.txt\");
        AssetMan         


        

Answer 1

one line solution for kotlin:

fun readFileText(fileName: String): String {
    return assets.open(fileName).bufferedReader().use { it.readText() }
}

Also you can use it as extension function everyWhere

fun Context.readTextFromAsset(fileName : String) : String{
     return assets.open(fileName).bufferedReader().use { 
     it.readText()}
}

Simply call in any context Class

context.readTextFromAsset("my file name")

Answer 2

It maybe too late but for the sake of others who look for the peachy answers :

public static String loadAssetFile(Context context, String fileName) {
    try {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(context.getAssets().open(fileName)));
        StringBuilder out= new StringBuilder();
        String eachline = bufferedReader.readLine();
        while (eachline != null) {
            out.append(eachline);
            eachline = bufferedReader.readLine();
        }
        return out.toString();
    } catch (IOException e) {
        Log.e("Load Asset File",e.toString());
    }
    return null;
}

Answer 3

cityfile.txt

   public void getCityStateFromLocal() {
        AssetManager am = getAssets();
        InputStream inputStream = null;
        try {
            inputStream = am.open("city_state.txt");
        } catch (IOException e) {
            e.printStackTrace();
        }
        ObjectMapper mapper = new ObjectMapper();
        Map<String, String[]> map = new HashMap<String, String[]>();
        try {
            map = mapper.readValue(getStringFromInputStream(inputStream), new TypeReference<Map<String, String[]>>() {
            });
        } catch (IOException e) {
            e.printStackTrace();
        }
        ConstantValues.arrayListStateName.clear();
        ConstantValues.arrayListCityByState.clear();
        if (map.size() > 0)
        {
            for (Map.Entry<String, String[]> e : map.entrySet()) {
                CityByState cityByState = new CityByState();
                String key = e.getKey();
                String[] value = e.getValue();
                ArrayList<String> s = new ArrayList<String>(Arrays.asList(value));
                ConstantValues.arrayListStateName.add(key);
                s.add(0,"Select City");
                cityByState.addValue(s);
                ConstantValues.arrayListCityByState.add(cityByState);
            }
        }
        ConstantValues.arrayListStateName.add(0,"Select States");
    }
 // Convert InputStream to String
    public String getStringFromInputStream(InputStream is) {
        BufferedReader br = null;
        StringBuilder sb = new StringBuilder();
        String line;
        try {
            br = new BufferedReader(new InputStreamReader(is));
            while ((line = br.readLine()) != null) {
                sb.append(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (br != null) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        return sb + "";

    }

Answer 4

If you use other any class other than Activity, you might want to do like,

BufferedReader bufferedReader = new BufferedReader(new InputStreamReader( YourApplication.getInstance().getAssets().open("text.txt"), "UTF-8"));

Answer 5

@HpTerm answer Kotlin version:

private fun getDataFromAssets(activity: Activity): String {

    var bufferedReader: BufferedReader? = null
    var data = ""

    try {
        bufferedReader = BufferedReader(
            InputStreamReader(
                activity?.assets?.open("Your_FILE.html"),
                "UTF-8"
            )
        )                  //use assets? directly if in activity

        var mLine:String? = bufferedReader.readLine()
        while (mLine != null) {
            data+= mLine
            mLine=bufferedReader.readLine()
        }

    } catch (e: Exception) {
        e.printStackTrace()
    } finally {
        try {
            bufferedReader?.close()
        } catch (e: Exception) {
            e.printStackTrace()
        }
    }
    return data
}

Answer 6

AssetManager assetManager = getAssets();
InputStream inputStream = null;
try {
    inputStream = assetManager.open("helloworld.txt");
}
catch (IOException e){
    Log.e("message: ",e.getMessage());
}