How to load a URL that is inside a . txt from the Web View?

Question

The thing is, I’m making an app that’s kind of webbrowser. In this app, I have a url written inside a . txt, and I need to load this URL into my Webview. Follow what I’ve already done:

NOTE: I can already load a URL in my Webview by specifying it in the apk code itself as you can see in the codes below.

activity_main.xml:

<WebView  xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/webview"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

<Button
    style="?android:attr/buttonStyleSmall"
    android:layout_width="50px"
    android:layout_height="50px"
    android:id="@+id/button"
    android:background="@drawable/engrenagem"
    android:layout_alignWithParentIfMissing="false"
    android:layout_alignParentBottom="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_margin="20px" />

Mainactivity.java:

package com.abacoti.awser;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;  ;
import android.view.WindowManager;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MainActivity extends AppCompatActivity {

    String webURL = "http://www.google.com/";
    WebView web;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_main);
        web = (WebView) findViewById(R.id.webview);
        if (savedInstanceState == null)
        {
            web.loadUrl(webURL);
        }
        WebSettings webSettings = web.getSettings();
        webSettings.setJavaScriptEnabled(true);
        web.setWebViewClient(new WebViewClient());
    }

    @Override
    protected void onSaveInstanceState(Bundle outState )
    {
        super.onSaveInstanceState(outState);
        web.saveState(outState);
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState)
    {
        super.onRestoreInstanceState(savedInstanceState);
        web.restoreState(savedInstanceState);
    }

    @Override
    public void onBackPressed() {
    }
}

Answer 1

If the URL is inside a TXT you will need to read this TXT first using, of course the file must contain only the URL.

Using this answer as the basis https://stackoverflow.com/a/12421888/1518921 you should do this (if the file is in SD):

File sdcard = Environment.getExternalStorageDirectory();

//Pega o arquivo de text
File file = new File(sdcard, "MEU_ARQUIVO_TXT_COM_A_URL.txt");

//Pra obter a string
StringBuilder text = new StringBuilder();

try {
    InputStreamReader isr = new InputStreamReader(new FileInputStream(file), "UTF8");
    BufferedReader in = new BufferedReader(isr);
    String line;

    while ((line = in.readLine()) != null) {
        text.append(line);
    }
    in.close();
} catch (IOException e) {
    Log.d("TAG", "Erro de leitura do arquivo");
}

web = (WebView) findViewById(R.id.webview);
web.loadUrl(text.toString());

If you are in the application’s Assets folder:

//Equivale ao android_asset/MEU_ARQUIVO_TXT_COM_A_URL.txt
InputStream inputStream = getAssets().open("MEU_ARQUIVO_TXT_COM_A_URL.txt");

//Pra obter a string
StringBuilder text = new StringBuilder();

try {
    InputStreamReader isr = new InputStreamReader(inputStream, "UTF8");
    BufferedReader in = new BufferedReader(isr);
    String line;

    while ((line = in.readLine()) != null) {
        text.append(line);
    }
    in.close();
} catch (IOException e) {
    Log.d("TAG", "Erro de leitura do arquivo");
}

web = (WebView) findViewById(R.id.webview);
web.loadUrl(text.toString());

The AP changed the meaning of the question, so I crossed off the previous answer, for any similar problem I recommend trying this answer /a/133955/3635

If the file is in the Assets folder you have to load it like this:

WebView view = new WebView(this);
view.loadUrl("file:///android_asset/foo.txt");
setContentView(view);

If you want to access other files you need to use:

• Returns the path of the first card (or other type of external storage):

   Environment.getExternalStorageDirectory().toString();
  

• Returns the system path (as Android is a linux you will probably have something like / and cannot save to most folders):

   Environment.getRootDirectory().toString();
  

Then the path must be something like:

String path = Environment.getExternalStorageDirectory().toString() + "/pasta/foo.txt";

WebView view = new WebView(this);
view.loadUrl(path);
setContentView(view);

Follows documentation:

• http://developer.android.com/intl/pt-br/tools/projects/index.html
• http://developer.android.com/intl/pt-br/reference/android/os/Environment.html