Android读取行文本文件

Question

I have a text file which contains all five-letter words in Turkish. From there, I want to draw a random word. AssetManager screen printing on all of the word, but somehow I did not drop a single word. How can I use a loop?

I would be glad if you can help.

Source:

public class MainActivity extends Activity {

    Button degistir;
    TextView kelime;
    EditText ykelime;
    Random rnd =new Random();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        degistir=(Button)findViewById(R.id.btngiris);
        kelime=(TextView)findViewById(R.id.kelime);
        ykelime=(EditText)findViewById(R.id.giris);

        AssetManager assetManager = getAssets();

        // To load text file
        InputStream input;
        try {
            input = assetManager.open("5HarfliKelimeler.txt");

            int size = input.available();
            byte[] buffer = new byte[size];
            input.read(buffer);
            input.close();

            // byte buffer into a string
            String text = new String(buffer);

            int sayi=rnd.nextInt(text.length());

            kelime.setText(text);
        } 
        catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        degistir.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                kelime.setText(ykelime.getText());
                ykelime.setText(null);
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
}

Answer 1

firstly, if your file content won't be changed, then you have to count max line number and write it as constant:

private String getRandomLine() {
        final int FILE_MAX_LINE_INDEX = 5000;//if your file has 5000 lines, and it's content never be changed
        Random rnd = new Random();
        final int lineIndex = rnd.nextInt(FILE_MAX_LINE_INDEX);
        try {
            LineNumberReader lnr = new LineNumberReader(new InputStreamReader(getAssets().open("5HarfliKelimeler.txt")));
            String s;
            while ((s = lnr.readLine()) != null) {
                if (lnr.getLineNumber() == lineIndex) {
                    lnr.close();
                    return s;
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "";
    }

or, if your content may be changed, and you don't know how many lines will be in file:

private String getRandomLine() {
        List<String> fiveLetterWords = new ArrayList<String>(5000);
        try {
            LineNumberReader lnr = new LineNumberReader(new InputStreamReader(getAssets().open("5HarfliKelimeler.txt")));
            String s;
            while ((s = lnr.readLine()) != null) {
                fiveLetterWords.add(s);
            }
            lnr.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        Random rnd = new Random();
        return fiveLetterWords.get(rnd.nextInt(fiveLetterWords.size()));
    }

Answer 2

Read file line by line and get all words to a list.( How to read line by line | check here )

Then, specify a random index for each button click. Finally, display the word from the list with generated index. ( Index range must be from 0 to size of your list )

-- I edited your code without any editor. --

    public class MainActivity extends Activity {

            Button degistir;

             TextView kelime;

            EditText ykelime;
            List<String> wordList=null;

            @Override
            protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_main);

                degistir=(Button)findViewById(R.id.btngiris);
                kelime=(TextView)findViewById(R.id.kelime);
                ykelime=(EditText)findViewById(R.id.giris);

                AssetManager assetManager = getAssets();

                // To load text file
                InputStream input;
                try {
                    input = assetManager.open("5HarfliKelimeler.txt");
                    wordList= new ArrayList<String>();

       BufferedReader reader = new BufferedReader(new InputStreamReader(input , charset.forName("UTF-8")));

                    String line = "";



                        while ((line = reader.readLine()) != null) {
                           wordList.add(line);
                        }





                } 
                catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }


                degistir.setOnClickListener(new OnClickListener(){

                    @Override
                    public void onClick(View arg0) {
                        // TODO Auto-generated method stub
                        if(wordList!=null){
                         Random rnd =new Random();
                         Integer generatedIndex = rnd.nextInt(wordList.size());                    
                         String selectedWord=wordList.get(generatedIndex);
                         kelime.setText(selectedWord);
                         // ykelime.setText(null);
                        }
                          else{
                          //DISPLAY MSG ETC.
                         }
                    }

                });
            }
            @Override
            public boolean onCreateOptionsMenu(Menu menu) {
                getMenuInflater().inflate(R.menu.main, menu);

                return true;
            }

        }