Текст книги "Java Code"

Класс программы «Заметки» для android

public class Note extends AppCompatActivity {

EditText t;

    final int cleen=1,rec=2,allapps=3,exit=4;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_note);

        t=(EditText)findViewById(R.id.editText);

    }

    public void newNote(View view){

        writeFile(«n»+getDate()+"n"+t.getText().toString(),true);

    }

    void writeFile(String s,boolean b){

        if (!Environment.getExternalStorageState().equals(

                Environment.MEDIA_MOUNTED)) {

            Toast.makeText(getApplicationContext(),"Память недоступна", Toast.LENGTH_SHORT).show();

            return;

        }

        if («„.equals(t.getText().toString()))s=“n»+getDate()+"n"+"<пустая заметка>";

        File sdPath = Environment.getExternalStorageDirectory();

        sdPath = new File(sdPath.getAbsolutePath() + "/" + «MyNotesReester»);

        sdPath.mkdirs();

        File sdFile = new File(sdPath, «notes»);

        try {

            BufferedWriter bw = new BufferedWriter(new FileWriter(sdFile,b));

            bw.write(s);

            bw.close();

        } catch (IOException e) {

            e.printStackTrace();

            Toast.makeText(getApplicationContext(),"Произошла ошибка", Toast.LENGTH_SHORT).show();

            return;

        }

        if(!"".equals(t.getText().toString()))

            Toast.makeText(getApplicationContext(),"Заметка добавлена", Toast.LENGTH_SHORT).show();

        else

            Toast.makeText(getApplicationContext(),"Добавлена пустая заметка", Toast.LENGTH_SHORT).show();

        if (!b)Toast.makeText(getApplicationContext(),"Файл перезаписан",Toast.LENGTH_SHORT).show();

    }

    public void showNotes(View view){

         startActivity(new Intent(Note.this,Show.class));

    }

    private String getDate() {

        SimpleDateFormat dateFormat = new SimpleDateFormat(«dd.MM.yyyy HH:mm»);

        return dateFormat.format(new Date());

    }

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.notebook, menu);

        menu.add(0,cleen,0,"Очистить");

        menu.add(0,rec,0,"Перезаписать");

        menu.add(0,allapps,0,"Приложения");

        menu.add(0,exit,0,"ВЫХОД");

        return true;

    }

    public boolean onOptionsItemSelected(MenuItem item){

        switch (item.getItemId()){

            case cleen:

                t.setText("");

                break;

            case rec:

                writeFile(«n»+getDate()+"n"+t.getText().toString(),false);

                break;

            case allapps:

                try {

                    Intent intent = new Intent(Intent.ACTION_VIEW);

                    intent.setData(Uri.parse(«market://search?q=developer%20kalexal&hl=ru»));

                    startActivity(intent);

                }catch (Exception e){

                    Toast.makeText(getApplicationContext(),"Не найдено ни одного маркета", Toast.LENGTH_LONG).show();

                }

                break;

            case exit:

                finish();

                break;

        }

        return super.onOptionsItemSelected(item);

    }

}