Movie ListView Fragment Movie Info Fragment
我所拥有的是一个拥有电影数据库的应用程序，在我的第一个标签片段中，我有一个列表视图，其中包含我数据库中的所有电影。我想要它，所以当我点击列表视图中的电影时，它会抓取电影的数据库ID并移动到显示电影信息的下一个标签。
主要活动（保存我的标签视图寻呼机的活动）
public class MainActivity extends AppCompatActivity {
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setOffscreenPageLimit(1);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG).setAction("Action", null).show();
}
});
}
@Override
public boolean onCreateOptionsMenu (Menu menu){
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected (MenuItem item){
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public static class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new FragmentMain();
case 1:
return new FragmentManuallyAddMovie();
case 2:
return new FragmentAddInternetMovie();
}
return null;
}
@Override
public int getCount() {
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "MOVIES";
case 1:
return "ADD";
case 2:
return "SEARCH";
}
return null;
}
}
public static class PlaceholderFragment extends Fragment {
private static final String ARG_SECTION_NUMBER = "section_number";
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
}
FragmentMain（电影数据库以列表视图显示的位置）
public class FragmentMain extends Fragment implements AdapterView.OnItemClickListener, AdapterView.OnItemLongClickListener, View.OnClickListener {
private MoviesDBHandler handler;
private SimpleCursorAdapter adapter;
private ListView lvMovies;
public FragmentMain() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_main, container, false);
handler = new MoviesDBHandler(this.getActivity());
v.findViewById(R.id.btn_delete_all_movies).setOnClickListener(this);
lvMovies = (ListView) v.findViewById(R.id.lv_movies);
lvMovies.setEmptyView(v.findViewById(R.id.tv_instructionsa));
lvMovies.setOnItemClickListener(this);
lvMovies.setOnItemLongClickListener(this);
return v;
}
@Override
public void onResume() {
super.onResume();
String[] from = {MoviesDBHelper.MOVIES_TITLE, MoviesDBHelper.MOVIES_GENRE, MoviesDBHelper.MOVIES_YEAR, MoviesDBHelper.MOVIES_PLOT, MoviesDBHelper.MOVIES_RATING, MoviesDBHelper.MOVIES_RUNTIME, MoviesDBHelper.MOVIES_IMAGE_URL};
int[] to = {R.id.tv_title, R.id.tv_genre, R.id.tv_year, R.id.tv_plot, R.id.tv_rating, R.id.tv_runtime, R.id.img_movie_poster};
adapter = new SimpleCursorAdapter(this.getActivity(), R.layout.movie_list_item, handler.getMovies(), from, to, CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
adapter.setViewBinder(new SimpleCursorAdapter.ViewBinder() {
@Override
public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
if(columnIndex == cursor.getColumnIndex(MoviesDBHelper.MOVIES_IMAGE_URL)) {
DatabaseDownloadImage task = new DatabaseDownloadImage((ImageView) view);
task.execute(cursor.getString(columnIndex));
return true;
}
return false;
}
});
lvMovies.setAdapter(adapter);
}
public class DatabaseDownloadImage extends AsyncTask<String, Integer, Bitmap> {
private ImageView imageView;
public DatabaseDownloadImage(ImageView imageView) {
this.imageView = imageView;
}
@Override
protected Bitmap doInBackground(String... params) {
String address = params[0];
HttpURLConnection connection = null;
Bitmap b = null;
try {
URL url = new URL(address);
connection = (HttpURLConnection) url.openConnection();
if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
return null;
}
else {
b = BitmapFactory.decodeStream(connection.getInputStream());
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return b;
}
protected void onPostExecute(Bitmap bitmap) {
if (bitmap == null) {
return;
}
imageView.setImageBitmap(Bitmap.createScaledBitmap(bitmap, 120, 180, false));
}
}
@Override
public void onClick(View v) {
switch (v.getId()) {
//Delete all movies from database
case R.id.btn_delete_all_movies:
AlertDialog deleteMovieDialog = new AlertDialog.Builder(this.getActivity()).create();
deleteMovieDialog.setTitle("Delete All Movies?");
deleteMovieDialog.setIcon(R.drawable.ic_delete);
deleteMovieDialog.setButton(DialogInterface.BUTTON_POSITIVE, "No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
deleteMovieDialog.setButton(DialogInterface.BUTTON_NEGATIVE, "Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
handler.deleteAllMovies();
adapter.changeCursor(handler.getMovies());
}
});
deleteMovieDialog.show();
break;
}
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, final long id) {
AlertDialog deleteMovieDialog = new AlertDialog.Builder(this.getActivity()).create();
deleteMovieDialog.setTitle("Delete Movie?");
deleteMovieDialog.setIcon(R.drawable.ic_delete);
deleteMovieDialog.setButton(DialogInterface.BUTTON_POSITIVE, "No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
deleteMovieDialog.setButton(DialogInterface.BUTTON_NEGATIVE, "Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
handler.deleteMovie(id);
adapter.changeCursor(handler.getMovies());
}
});
deleteMovieDialog.show();
return true;
}
}
答案 0 :(得分：0)
所有片段到片段的通信都是通过关联的方式完成的 活动。两个碎片永远不应该直接沟通。
http://developer.android.com/intl/es/training/basics/fragments/communicating.html
您可以使用您在第一个片段中更改的MainActivity中的静态变量传递这两个片段，并在第二个片段中获取此变量的内容。
更新
创建Movie.class，以保存一部电影的所有数据：
public class Movie() {
String title;
String genre;
int year;
String plot;
int rating;
int runtime;
String img;
public Movie(String title, String genre, int year, String plot, int rating, int runtime, String img) {
this.title=title;
this.genre=genre;
this.year=year;
this.plot=plot;
this.rating=rating;
this.runtime=runtime;
this.img=img;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title=title;
}
//The same for the other variables
}
并在您的MainActivity中创建一个Movie的静态变量：
public static Movie movie;
在onClick方法中保存电影的数据：
MainActivity.movie=new Movie(title, genre, year,plot,rating,runtime,img);
并将电影放入第二个片段：
String title=MainActivity.movie.getTitle();
String genre=MainActivity.movie.getGenre();
...