当我启动应用程序时，它会正确加载所有电影海报。当我点击海报时，它应该启动DetailActivity并显示我选择的海报。然而，我点击的每张海报都显示相同的海报。
MainActivityFragment
/**
* A placeholder fragment containing a simple view.
*/
public class MainActivityFragment extends Fragment implements LoaderManager.LoaderCallbacks<Cursor>{
private static final int MOVIE_LOADER = 0;
private final String LOG_TAG = MainActivityFragment.class.getSimpleName();
private static final String[] MOVIE_COLUMNS = {
MovieContract.MovieEntry.TABLE_NAME + "." + MovieContract.MovieEntry._ID,
MovieContract.MovieEntry.COLUMN_MOVIE_POSTER
};
static final int COL_MOVIE_ID = 0;
static final int COL_MOVIE_URL = 1;
private MovieAdapter mMovieAdapter;
public MainActivityFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
mMovieAdapter = new MovieAdapter(getActivity(),null,0);
final View rootView = inflater.inflate(R.layout.fragment_main, container, false);
GridView gridView = (GridView) rootView.findViewById(R.id.movieposter_image_gridview);
gridView.setAdapter(mMovieAdapter);
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l){
Cursor cursor = (Cursor)adapterView.getItemAtPosition(position);
if(cursor != null){
Intent intent = new Intent(getActivity(), DetailActivity.class)
.setData(MovieContract.MovieEntry.CONTENT_URI);
startActivity(intent);
Log.d("DEBUG", "Selected item position " + position + ", with id: " + l);
}
}
});
return rootView;
}
@Override
public void onActivityCreated(Bundle savedInstanceState){
getLoaderManager().initLoader(MOVIE_LOADER, null, this);
super.onActivityCreated(savedInstanceState);
}
private void updateApplication() {
FetchMovieTask movieTask = new FetchMovieTask(getActivity());
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
String sortBy = prefs.getString(getString(R.string.pref_sort_by_key),
getString(R.string.pref_popular_default));
movieTask.execute(sortBy);
}
@Override
public void onStart() {
super.onStart();
updateApplication();
}
@Override
public Loader<Cursor> onCreateLoader(int i, Bundle bundle){
Uri movieUri = MovieContract.MovieEntry.CONTENT_URI;
return new CursorLoader(getActivity(),
movieUri,
MOVIE_COLUMNS,
null,
null,
null);
}
@Override
public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor){
mMovieAdapter.swapCursor(cursor);
}
@Override
public void onLoaderReset(Loader<Cursor> cursorLoader){
mMovieAdapter.swapCursor(null);
}
}
DetailActivity
public class DetailActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new DetailFragment())
.commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.detail, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
startActivity(new Intent(this, SettingsActivity.class));
return true;
}
return super.onOptionsItemSelected(item);
}
public static class DetailFragment extends Fragment implements LoaderCallbacks<Cursor> {
private final String LOG_TAG = DetailFragment.class.getSimpleName();
private static final String Movie_SHARE_HASHTAG = " #MovieApp";
private ShareActionProvider mShareActionProvider;
private String mMovie;
ImageView poster;
private static final int DETAIL_LOADER = 0;
private final String[] DETAIL_COLUMNS = {
MovieContract.MovieEntry.TABLE_NAME + "." + MovieContract.MovieEntry._ID,
MovieContract.MovieEntry.COLUMN_MOVIE_POSTER
};
private static final int COL_MOVIE_ID = 0;
private static final int COL_MOVIE_POSTER = 1;
public DetailFragment() {
setHasOptionsMenu(true);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_detail, container, false);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
getLoaderManager().initLoader(DETAIL_LOADER, null, this);
super.onActivityCreated(savedInstanceState);
}
@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
Log.v(LOG_TAG, "In onCreateLoader");
Intent intent = getActivity().getIntent();
if (intent == null) {
return null;
}
return new CursorLoader(
getActivity(),
intent.getData(),
DETAIL_COLUMNS,
null,
null,
null
);
}
@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
Log.v(LOG_TAG, "In onLoadFinished");
if (!data.moveToFirst()) {
return;
}
String posterURL = data.getString(COL_MOVIE_POSTER);
final String POSTERIMAGE_BASE_URL = "http://image.tmdb.org/t/p/";
final String POSTERIMAGE_SIZE = "w500";
poster = (ImageView) getView().findViewById(R.id.detailActivity_image_view);
final String POSTERIMAGE_URL = POSTERIMAGE_BASE_URL + POSTERIMAGE_SIZE + posterURL;
Picasso.with(this.getActivity()).load(POSTERIMAGE_URL).into(poster);
Log.v(LOG_TAG, "Poster Urls: " + POSTERIMAGE_URL);
}
@Override
public void onLoaderReset(Loader<Cursor> loader) {
}
}
}
MovieAdapter
public class MovieAdapter extends CursorAdapter {
private final String LOG_TAG = MovieAdapter.class.getSimpleName();
public MovieAdapter(Context context, Cursor c, int flags){
super(context,c,flags);
}
private String convertCursorRowToUXFormat(Cursor cursor){
String poster = cursor.getString(MainActivityFragment.COL_MOVIE_URL);
return poster;
}
@Override
public View newView(Context context,Cursor cursor,ViewGroup parent){
View view = LayoutInflater.from(context).inflate(R.layout.poster_image, parent, false);
return view;
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
final String POSTERIMAGE_BASE_URL = "http://image.tmdb.org/t/p/";
final String POSTERIMAGE_SIZE = "w500";
ImageView posterImage = (ImageView)view;
final String POSTERIMAGE_URL = POSTERIMAGE_BASE_URL + POSTERIMAGE_SIZE + convertCursorRowToUXFormat(cursor);
Picasso.with(context).load(POSTERIMAGE_URL).into(posterImage);
Log.v(LOG_TAG, "Poster Urls: " + POSTERIMAGE_URL);
}
}
FetchMovieTask
public class FetchMovieTask extends AsyncTask<String, Void, Void> {
private final String LOG_TAG = FetchMovieTask.class.getSimpleName();
private final Context mContext;
public FetchMovieTask(Context context) {
mContext = context;
}
private boolean DEBUG = true;
private void getMovieDataJSON(String movieJSONStr)
throws JSONException {
final String MDB_RESULT = "results";
final String MDB_POSTER = "poster_path";
final String MDB_MOVIE_TITLE = "original_title";
final String MDB_MOVIE_PLOT = "overview";
final String MDB_MOVIE_RATING = "popularity";
final String MDB_RELEASE_DATE = "release_date";
try {
JSONObject movieJSON = new JSONObject(movieJSONStr);
JSONArray movieArray = movieJSON.getJSONArray(MDB_RESULT);
Vector<ContentValues> cVVector = new Vector<>(movieArray.length());
for (int i = 0; i < movieArray.length(); i++) {
String poster;
String title;
String plot;
String rating;
String releaseDate;
//Get theJSON object representing the movie
JSONObject movieDetail = movieArray.getJSONObject(i);
poster = movieDetail.getString(MDB_POSTER);
title = movieDetail.getString(MDB_MOVIE_TITLE);
plot = movieDetail.getString(MDB_MOVIE_PLOT);
rating = movieDetail.getString(MDB_MOVIE_RATING);
releaseDate = movieDetail.getString(MDB_RELEASE_DATE);
ContentValues movieDetailValues = new ContentValues();
movieDetailValues.put(MovieContract.MovieEntry.COLUMN_MOVIE_NAME, title);
movieDetailValues.put(MovieContract.MovieEntry.COLUMN_MOVIE_POSTER, poster);
movieDetailValues.put(MovieContract.MovieEntry.COLUMN_MOVIE_PLOT, plot);
movieDetailValues.put(MovieContract.MovieEntry.COLUMN_MOVIE_RATING, rating);
movieDetailValues.put(MovieContract.MovieEntry.COLUMN_MOVIE_REDATE, releaseDate);
cVVector.add(movieDetailValues);
}
int inserted = 0;
if (cVVector.size() > 0) {
ContentValues[] cvArray = new ContentValues[cVVector.size()];
cVVector.toArray(cvArray);
inserted = mContext.getContentResolver().bulkInsert(MovieContract.MovieEntry.CONTENT_URI, cvArray);
}
Log.d(LOG_TAG, "FetchMovieTask Complete. " + inserted + " Inserted");
} catch (JSONException e) {
Log.e(LOG_TAG, e.getMessage(), e);
e.printStackTrace();
}
}
@Override
protected Void doInBackground (String...params){
if (params.length == 0) {
return null;
}
HttpURLConnection urlConnection = null;
BufferedReader reader = null;
String movieJSONStr = null;
try {
final String MOVIE_BASE_URL = "http://api.themoviedb.org/3/movie";
Uri builtUri = Uri.parse(MOVIE_BASE_URL).buildUpon()
.appendPath(params[0])
.appendQueryParameter("api_key", BuildConfig.MOVIE_API_KEY)
.build();
URL url = new URL(builtUri.toString());
Log.v(LOG_TAG, "Built URI " + builtUri.toString());
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.connect();
InputStream inputStream = urlConnection.getInputStream();
StringBuffer buffer = new StringBuffer();
if (inputStream == null) {
return null;
}
reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = reader.readLine()) != null) {
buffer.append(line + "\n");
}
if (buffer.length() == 0) {
return null;
}
movieJSONStr = buffer.toString();
getMovieDataJSON(movieJSONStr);
} catch (IOException e) {
Log.e(LOG_TAG, "Error ", e);
}
catch(JSONException e){
Log.e(LOG_TAG, e.getMessage(), e);
e.printStackTrace();
} finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
if (reader != null) {
try {
reader.close();
} catch (final IOException e) {
Log.e(LOG_TAG, "Error closing stream", e);
}
}
}
return null;
}
}
答案 0 :(得分：0)
您需要根据COL_MOVIE_POSTER的网格视图中点击的项目更新DetailActivity中的变量MainActivityFragment。