Android Studio：读取文本文件，并在弹出窗口中显示

Question

I'm creating an app that contains a "Tip of the Day" feature. This is essentially a pop-up, activated by a button. It currently has filler text right now, but I am trying to create a way in which a text file (stored in src/main/assets) is read, and an individual line is displayed in the pop-up. How can I do this? These lines in the text file are individualized by the return key. I will find a way to display unique tips each time the button is clicked, but I will get to that part later.

Here is the code for the pop-up itself:

public class homeFragmentDialog extends Activity {

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    AlertDialog.Builder builder1 = new AlertDialog.Builder(this);
    builder1.setMessage("Filler text.");
    builder1.setCancelable(true);

    builder1.setPositiveButton(
            "Close",
            new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    dialog.cancel();
                }
            });

    AlertDialog alert11 = builder1.create();
    alert11.show();

}
}

And just in case, here is the fragment file which holds the button that activates the previous activity:

public class homeFragment extends Fragment {

View rootView;

private Button button0;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    rootView = inflater.inflate(R.layout.fragment_home, container, false);

    button0 = (Button) rootView.findViewById(R.id.buttonDialog);
    button0.setOnClickListener(new View.OnClickListener() {


        @Override
        public void onClick(View v) {
            Intent intent = new Intent(getActivity(), homeFragmentDialog.class);
            startActivity(intent);
        }


    });

    return rootView;

}

}

Answer 1

This should be enough for you to fetch the information from the text file in the assets folder as String.

If you have problems with this short code snippet this one should be way more extensive.

Once you got the text as a String object you should be able to add it inside your setMessage function to display it.

Answer 2

You can use getAssets() if you access to a Context:

try {
    InputStream inputStream = getAssets().open("textfile.txt");
    builder1.setMessage(convertStreamToString(inputStream));
} catch (IOException e){
    // Log exception
}

Where convertStreamToString() came from Pavel Repin's answer :

static String convertStreamToString(java.io.InputStream is) {
    java.util.Scanner s = new java.util.Scanner(is).useDelimiter("\\A");
    return s.hasNext() ? s.next() : "";
}

Or you can read the ammount of bytes you want(in your case one line).

EDIT:

Instead of convertStreamToString(), you can use this method to get a single line:

static String getLineFromStream(java.io.InputStream is, int linePos){
    BufferedReader br = new BufferedReader(new InputStreamReader(is));

    String line = null;
    try {
        for (int i = 0; i <= linePos; i++) {
            line = br.readLine();
        }
    } catch (IOException e){
        // Handle exception here (or you can throw)
    }

    return line;
}