Методические указания по выполнению лабораторных работ по дисциплине «программирование мобильных устройств»
if (addToBackStack) replaceTransaction .addToBackStack(key); replaceTransaction .commit(); } public boolean
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15.-Metod LR Programmirovanie-mobil nyh-ustroistv 09.03.02 2021
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(addToBackStack) replaceTransaction .addToBackStack(key); replaceTransaction .commit(); } public boolean returnToBackStack(String stackKey, boolean inclusive) { return getSupportFragmentManager() .popBackStackImmediate(stackKey, inclusive ? FragmentManager. POP_BACK_STACK_INCLUSIVE : 0); } public Bus getBus() { return bus ; } } 75 Листинг BaseFragment.java package ru.omgtu.myapplication; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.view.View; import com.squareup.otto.Bus; import butterknife.ButterKnife; public class BaseFragment extends Fragment { private Bus bus ; @Override public void onCreate(@Nullable Bundle savedInstanceState) { super .onCreate(savedInstanceState); } @Override public void onStart() { super .onStart(); bus = ((BaseActivity) getActivity()).getBus(); bus .register( this ); } @Override public void onStop() { super .onStop(); bus .unregister( this ); } @Override public void onDestroy() { super .onDestroy(); } @Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { super .onViewCreated(view, savedInstanceState); ButterKnife. bind ( this , view); } 76 @Override public void onDestroyView() { super .onDestroyView(); ButterKnife. unbind ( this ); } public BaseActivity getBaseActivity() { return (BaseActivity) getActivity(); } public Bus getBus() { return bus ; } } Листинг MainActivity.java package ru.omgtu.myapplication; import android.content.Intent; import android.os.Bundle; import com.squareup.otto.Subscribe; public class MainActivity extends BaseActivity { @Override protected void onStop() { super .onStop(); } @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout. activity_main ); if (savedInstanceState == null ) getSupportFragmentManager().beginTransaction().add(R.id. container , new HW7MenuFragment()).commit(); } @Subscribe public void onOpenSaveInSharedPreferencesFragmentEvent(OpenSaveInSharedP referencesFragmentEvent event) { } 78 replaceFragment( new SaveInSharedPreferencesFragment(), true ); @Subscribe public void onOpenSaveInFileFragmentEvent(OpenSaveInFileFragmentEvent event) { replaceFragment( new SaveInFileFragment(), true ); } } Листинг HW7MenuFragment.java package ru.omgtu.myapplication; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import butterknife.ButterKnife; import butterknife.OnClick; public class HW7MenuFragment extends BaseFragment { public HW7MenuFragment() { // Required empty public constructor } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout. fragment_hw7_menu , container, false ); ButterKnife. bind ( this , view); return view; } @Override public void onDestroyView() { super .onDestroyView(); ButterKnife. unbind ( this ); } 78 @OnClick(R.id. save_in_shared_preferences_button ) public void onSaveInSharedPreferencesButtonClick() { getBus().post( new OpenSaveInSharedPreferencesFragmentEvent()); } @OnClick(R.id. save_in_file_button ) public void onSaveInFileButtonClick() { getBus().post( new OpenSaveInFileFragmentEvent()); } @OnClick(R.id. phone_book_button ) public void onPhoneBookButtonClick() { getBus().post( new OpenPhoneBookFragmentEvent()); } } Листинг SaveInSharedPreferencesFragment.java package ru.omgtu.myapplication; import android.content.Context; import android.content.SharedPreferences; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.EditText; import butterknife.Bind; import butterknife.ButterKnife; public class SaveInSharedPreferencesFragment extends BaseFragment { public static final String APP_PREFERENCES = "myPreferences" ; public static final String APP_PREFERENCES_TEXT = "Text" ; SharedPreferences sharedPreferences ; @Bind(R.id. edit_text_for_save ) EditText editTextForSave ; 83 public SaveInSharedPreferencesFragment() { // Required empty public constructor } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout. fragment_save_text , container, false ); ButterKnife. bind ( this , view); sharedPreferences = getContext().getSharedPreferences( APP_PREFERENCES , Context. MODE_PRIVATE ); return view; } @Override public void onDestroyView() { super .onDestroyView(); ButterKnife. unbind ( this ); } @Override public void onPause() { super .onPause(); SharedPreferences.Editor editor = sharedPreferences .edit(); editor.putString( APP_PREFERENCES_TEXT , editTextForSave .getText().toString()); editor.apply(); } @Override public void onResume() { super .onResume(); if ( sharedPreferences .contains( APP_PREFERENCES_TEXT )) { editTextForSave .setText( sharedPreferences .getString( APP_PREFER ENCES_TEXT , "" )); } } 84 } Листинг SaveInFileFragment.java package ru.omgtu.myapplication; import android.content.Context; import android.os.Bundle; import android.os.Environment; import android.support.v4.app.Fragment; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.EditText; import android.widget.Toast; import ru.omgtu.myapplication.R; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.OutputStreamWriter; import butterknife.Bind; import butterknife.ButterKnife; public class SaveInFileFragment extends BaseFragment { public static final String FILE_NAME = "fileForSaveText.txt" ; File file ; @Bind(R.id. edit_text_for_save ) EditText editTextForSave ; public SaveInFileFragment() { // Required empty public constructor } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment View view = inflater.inflate(R.layout. fragment_save_text , container, false ); ButterKnife. bind ( this , view); return view; } @Override 85 public void onDestroyView() { super .onDestroyView(); ButterKnife. unbind ( this ); } @Override public void onPause() { super .onPause(); try { OutputStream outputStream = getContext().openFileOutput( FILE_NAME , Context. MODE_PRIVATE ); OutputStreamWriter osw = new OutputStreamWriter(outputStream); osw.write( editTextForSave .getText().toString()); osw.close(); outputStream.close(); } catch (Throwable t) { Toast. makeText (getContext(), "Exception: " + t.toString(), Toast. LENGTH_LONG ).show(); } } @Override public void onResume() { super .onResume(); try { InputStream inputStream = getContext().openFileInput( FILE_NAME ); InputStreamReader isr = new InputStreamReader(inputStream); BufferedReader reader = new BufferedReader(isr); editTextForSave .setText(reader.readLine()); reader.close(); isr.close(); inputStream.close(); } catch (Throwable t) { Toast. makeText (getContext(), "Exception: " + t.toString(), Toast. LENGTH_LONG ).show(); } } } 86 |