我已经创建了一个应用程序并将sqlite数据库添加到我的应用程序中，但是该应用程序没有将数据保存到sqlite数据库中，但是为什么呢？ 我在这里发布代码。如果您在我的代码中遇到任何错误，请帮助我解决。 如果您需要我的应用程序的更多代码，请发表评论。.我将在此处发布代码。 我将感谢你...
HomeLatestAdapter
LatestVideoAdapter.java
public class LatestVideoAdapter extends RecyclerView.Adapter<LatestVideoAdapter.ItemRowHolder> {
private ArrayList<ItemMostView> dataList;
private Context mContext;
private DatabaseHelper databaseHelper;
private InterstitialAd mInterstitial;
private int AD_COUNT = 0;
public LatestVideoAdapter(Context context, ArrayList<ItemMostView> dataList) {
this.dataList = dataList;
this.mContext = context;
databaseHelper = new DatabaseHelper(mContext);
}
@Override
public ItemRowHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_most_view_item, parent, false);
return new ItemRowHolder(v);
}
@Override
public void onBindViewHolder(final ItemRowHolder holder, final int position) {
final ItemMostView singleItem = dataList.get(position);
holder.text.setText(singleItem.getVideoName());
holder.txt_cat_name.setText(singleItem.getCategoryName());
holder.txt_time.setText(singleItem.getDuration());
holder.text_view.setText(JsonUtils.Format(Integer.parseInt(singleItem.getViewC())));
if (singleItem.getType().equals("local")) {
Picasso.with(mContext).load(singleItem.getImageUrl()).into(holder.image);
} else if (singleItem.getType().equals("server_url")) {
Picasso.with(mContext).load(singleItem.getImageUrl()).into(holder.image);
} else if (singleItem.getType().equals("youtube")) {
Picasso.with(mContext).load(Constant.YOUTUBE_IMAGE_FRONT + singleItem.getVideoId() + Constant.YOUTUBE_IMAGE_BACK).into(holder.image);
}
holder.lyt_parent.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Constant.LATEST_IDD = singleItem.getId();
if (Constant.SAVE_ADS_FULL_ON_OFF.equals("true")) {
AD_COUNT++;
if (AD_COUNT == Integer.parseInt(Constant.SAVE_ADS_CLICK)) {
AD_COUNT = 0;
mInterstitial = new InterstitialAd(mContext);
mInterstitial.setAdUnitId(Constant.SAVE_ADS_FULL_ID);
AdRequest adRequest;
if (JsonUtils.personalization_ad) {
adRequest = new AdRequest.Builder()
.build();
} else {
Bundle extras = new Bundle();
extras.putString("npa", "1");
adRequest = new AdRequest.Builder()
.addNetworkExtrasBundle(AdMobAdapter.class, extras)
.build();
}
mInterstitial.loadAd(adRequest);
mInterstitial.setAdListener(new AdListener() {
@Override
public void onAdLoaded() {
// TODO Auto-generated method stub
super.onAdLoaded();
if (mInterstitial.isLoaded()) {
mInterstitial.show();
}
}
public void onAdClosed() {
Intent intent_single = new Intent(mContext, ActivityVideoDetails.class);
mContext.startActivity(intent_single);
}
@Override
public void onAdFailedToLoad(int errorCode) {
Intent intent_single = new Intent(mContext, ActivityVideoDetails.class);
mContext.startActivity(intent_single);
}
});
} else {
Intent intent_single = new Intent(mContext, ActivityVideoDetails.class);
mContext.startActivity(intent_single);
}
} else {
Intent intent_single = new Intent(mContext, ActivityVideoDetails.class);
mContext.startActivity(intent_single);
}
}
});
if (databaseHelper.getFavouriteById(singleItem.getId())) {
holder.floating_fav.setImageResource(R.drawable.ic_fav_hov);
} else {
holder.floating_fav.setImageResource(R.drawable.ic_fav);
}
holder.floating_fav.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ContentValues fav_list = new ContentValues();
if (databaseHelper.getFavouriteById(singleItem.getId())) {
databaseHelper.removeFavouriteById(singleItem.getId());
holder.floating_fav.setImageResource(R.drawable.ic_fav);
Toast.makeText(mContext, mContext.getString(R.string.favourite_remove), Toast.LENGTH_SHORT).show();
} else {
fav_list.put(DatabaseHelper.KEY_ID, singleItem.getId());
fav_list.put(DatabaseHelper.KEY_TITLE, singleItem.getVideoName());
fav_list.put(DatabaseHelper.KEY_IMAGE, singleItem.getImageUrl());
fav_list.put(DatabaseHelper.KEY_VIEW, singleItem.getViewC());
fav_list.put(DatabaseHelper.KEY_TYPE, singleItem.getType());
fav_list.put(DatabaseHelper.KEY_PID, singleItem.getVideoId());
fav_list.put(DatabaseHelper.KEY_TIME, singleItem.getDuration());
fav_list.put(DatabaseHelper.KEY_CNAME, singleItem.getCategoryName());
databaseHelper.addFavourite(DatabaseHelper.TABLE_FAVOURITE_NAME, fav_list, null);
holder.floating_fav.setImageResource(R.drawable.ic_fav_hov);
Toast.makeText(mContext, mContext.getString(R.string.favourite_add), Toast.LENGTH_SHORT).show();
}
}
});
}
@Override
public int getItemCount() {
return (null != dataList ? dataList.size() : 0);
}
public class ItemRowHolder extends RecyclerView.ViewHolder {
public ImageView image;
public TextView text, txt_cat_name, txt_time, text_view;
public LinearLayout lyt_parent;
FloatingActionButton floating_fav;
public ItemRowHolder(View itemView) {
super(itemView);
image = itemView.findViewById(R.id.image);
text = itemView.findViewById(R.id.text);
lyt_parent = itemView.findViewById(R.id.rootLayout);
txt_cat_name = itemView.findViewById(R.id.text_category);
txt_time = itemView.findViewById(R.id.text_time);
text_view = itemView.findViewById(R.id.text_view);
floating_fav = itemView.findViewById(R.id.floating_fav);
}
}
}
DatabaseHelper.java
public class DatabaseHelper extends SQLiteOpenHelper {
public static final int DATABASE_VERSION = 1;
public static final String DATABASE_NAME = "favoritevideo.db";
public static final String TABLE_FAVOURITE_NAME = "favourite";
public static final String KEY_ID = "id";
public static final String KEY_TITLE = "title";
public static final String KEY_IMAGE = "image";
public static final String KEY_VIEW = "rate";
public static final String KEY_TYPE = "type";
public static final String KEY_PID = "playid";
public static final String KEY_TIME = "time";
public static final String KEY_CNAME = "cname";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_FAVOURITE_TABLE = "CREATE TABLE " + TABLE_FAVOURITE_NAME + "("
+ KEY_ID + " INTEGER,"
+ KEY_TITLE + " TEXT,"
+ KEY_IMAGE + " TEXT,"
+ KEY_VIEW + " TEXT,"
+ KEY_TYPE + " TEXT,"
+ KEY_PID + " TEXT,"
+ KEY_TIME + " TEXT,"
+ KEY_CNAME + " TEXT"
+ ")";
db.execSQL(CREATE_FAVOURITE_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_FAVOURITE_NAME);
// Create tables again
onCreate(db);
}
public boolean getFavouriteById(String story_id) {
boolean count = false;
SQLiteDatabase db = this.getWritableDatabase();
String[] args = new String[]{story_id};
Cursor cursor = db.rawQuery("SELECT id FROM favourite WHERE id=? ", args);
if (cursor.moveToFirst()) {
count = true;
}
cursor.close();
db.close();
return count;
}
public void removeFavouriteById(String _id) {
SQLiteDatabase db = this.getWritableDatabase();
db.execSQL("DELETE FROM favourite " + " WHERE " + KEY_ID + " = " + _id);
db.close();
}
public long addFavourite(String TableName, ContentValues contentvalues, String s1) {
SQLiteDatabase db = this.getWritableDatabase();
return db.insert(TableName, s1, contentvalues);
}
public ArrayList<ItemMostView> getFavourite() {
ArrayList<ItemMostView> chapterList = new ArrayList<>();
String selectQuery = "SELECT * FROM "
+ TABLE_FAVOURITE_NAME;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
if (cursor.moveToFirst()) {
do {
ItemMostView contact = new ItemMostView();
contact.setId(cursor.getString(cursor.getColumnIndexOrThrow(KEY_ID)));
contact.setVideoName(cursor.getString(cursor.getColumnIndexOrThrow(KEY_TITLE)));
contact.setImageUrl(cursor.getString(cursor.getColumnIndexOrThrow(KEY_IMAGE)));
contact.setViewC(cursor.getString(cursor.getColumnIndexOrThrow(KEY_VIEW)));
contact.setType(cursor.getString(cursor.getColumnIndexOrThrow(KEY_TYPE)));
contact.setVideoId(cursor.getString(cursor.getColumnIndexOrThrow(KEY_PID)));
contact.setDuration(cursor.getString(cursor.getColumnIndexOrThrow(KEY_TIME)));
contact.setCategoryName(cursor.getString(cursor.getColumnIndexOrThrow(KEY_CNAME)));
chapterList.add(contact);
} while (cursor.moveToNext());
}
cursor.close();
db.close();
return chapterList;
}
}
latestDatabaseHelper.java
public class latestDatabaseHelper extends SQLiteOpenHelper {
public static final int DATABASE_VERSION = 1;
public static final String DATABASE_NAME = "latest.db";
public static final String TABLE_FAVOURITE_NAME = "latestvideo";
public static final String KEY_ID = "id";
public static final String KEY_AUTO_ID = "auto_id";
public static final String KEY_TITLE = "title";
public static final String KEY_IMAGE = "image";
public static final String KEY_VIEW = "rate";
public static final String KEY_TYPE = "type";
public static final String KEY_PID = "playid";
public static final String KEY_TIME = "time";
public static final String KEY_CNAME = "cname";
public latestDatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_FAVOURITE_TABLE = "CREATE TABLE " + TABLE_FAVOURITE_NAME + "("
+ KEY_ID + " INTEGER,"
+ KEY_AUTO_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
+ KEY_TITLE + " TEXT,"
+ KEY_IMAGE + " TEXT,"
+ KEY_VIEW + " TEXT,"
+ KEY_TYPE + " TEXT,"
+ KEY_PID + " TEXT,"
+ KEY_TIME + " TEXT,"
+ KEY_CNAME + " TEXT"
+ ")";
db.execSQL(CREATE_FAVOURITE_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_FAVOURITE_NAME);
// Create tables again
onCreate(db);
}
public boolean getFavouriteByIdRecent(String story_id) {
boolean count = false;
SQLiteDatabase db = this.getWritableDatabase();
String[] args = new String[]{story_id};
Cursor cursor = db.rawQuery("SELECT id FROM recentfavourite WHERE id=? ", args);
if (cursor.moveToFirst()) {
count = true;
}
cursor.close();
db.close();
return count;
}
public void removeFavouriteByIdRecent(String _id) {
SQLiteDatabase db = this.getWritableDatabase();
db.execSQL("DELETE FROM recentfavourite " + " WHERE " + KEY_ID + " = " + _id);
db.close();
}
public long addFavouriteRecent(String TableName, ContentValues contentvalues, String s1) {
SQLiteDatabase db = this.getWritableDatabase();
return db.insert(TableName, s1, contentvalues);
}
public ArrayList<ItemMostView> getFavouriteRecent() {
ArrayList<ItemMostView> chapterList = new ArrayList<>();
String selectQuery = "SELECT * FROM "
+ TABLE_FAVOURITE_NAME +" ORDER BY auto_id DESC";
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
if (cursor.moveToFirst()) {
do {
ItemMostView contact = new ItemMostView();
contact.setId(cursor.getString(cursor.getColumnIndexOrThrow(KEY_ID)));
contact.setVideoName(cursor.getString(cursor.getColumnIndexOrThrow(KEY_TITLE)));
contact.setImageUrl(cursor.getString(cursor.getColumnIndexOrThrow(KEY_IMAGE)));
contact.setViewC(cursor.getString(cursor.getColumnIndexOrThrow(KEY_VIEW)));
contact.setType(cursor.getString(cursor.getColumnIndexOrThrow(KEY_TYPE)));
contact.setVideoId(cursor.getString(cursor.getColumnIndexOrThrow(KEY_PID)));
contact.setDuration(cursor.getString(cursor.getColumnIndexOrThrow(KEY_TIME)));
contact.setCategoryName(cursor.getString(cursor.getColumnIndexOrThrow(KEY_CNAME)));
chapterList.add(contact);
} while (cursor.moveToNext());
}
cursor.close();
db.close();
return chapterList;
}
}
LatestVideoFragment.java
public class LatestVideoFragment extends Fragment {
private static final String SubCatId = "ID";
String selectedSubCatId;
ArrayList<ItemMostView> mListItem;
public RecyclerView recyclerView;
LatestVideoAdapter LatestVideoAdapter;
latestDatabaseHelper latestDatabaseHelper;
TextView textView;
private ProgressBar progressBar;
int page = 1;
public static LatestVideoFragment newInstance(String SCatId) {
LatestVideoFragment f = new LatestVideoFragment();
Bundle args = new Bundle();
args.putString(SubCatId, SCatId);
f.setArguments(args);
return f;
}
@Override
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_latest_video, container, false);
selectedSubCatId = getArguments().getString(SubCatId);
mListItem = new ArrayList<>();
latestDatabaseHelper = new latestDatabaseHelper(requireActivity());
progressBar = rootView.findViewById(R.id.progressBar);
recyclerView = rootView.findViewById(R.id.rv_video);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new GridLayoutManager(getActivity(), 1));
ItemOffsetDecoration itemDecoration = new ItemOffsetDecoration(requireActivity(), R.dimen.item_offset);
recyclerView.addItemDecoration(itemDecoration);
if (JsonUtils.isNetworkAvailable(requireActivity())) {
new getSubCat().execute(Constant.CATEGORY_ITEM_URL + selectedSubCatId + "&page=" + page);
Log.e("yes", "yes");
}
return rootView;
}
@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
if (isVisibleToUser) {
Log.e("yes", "yes");
} else {
Log.e("yes", "no");
}
}
private class getSubCat extends AsyncTask<String, Void, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
progressBar.setVisibility(View.VISIBLE);
recyclerView.setVisibility(View.GONE);
}
@Override
protected String doInBackground(String... params) {
return JsonUtils.getJSONString(params[0]);
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
progressBar.setVisibility(View.GONE);
recyclerView.setVisibility(View.VISIBLE);
if (null == result || result.length() == 0) {
showToast(getString(R.string.no_data));
} else {
try {
JSONObject mainJson = new JSONObject(result);
JSONArray jsonArray = mainJson.getJSONArray(Constant.CATEGORY_ARRAY_NAME);
JSONObject objJson;
for (int i = 0; i < jsonArray.length(); i++) {
objJson = jsonArray.getJSONObject(i);
ItemMostView objItem = new ItemMostView();
objItem.setId(objJson.getString(Constant.LATEST_ID));
objItem.setCategoryId(objJson.getString(Constant.LATEST_CATID));
objItem.setCategoryName(objJson.getString(Constant.LATEST_CAT_NAME));
objItem.setVideoUrl(objJson.getString(Constant.LATEST_VIDEO_URL));
objItem.setVideoId(objJson.getString(Constant.LATEST_VIDEO_ID));
objItem.setVideoName(objJson.getString(Constant.LATEST_VIDEO_NAME));
objItem.setDuration(objJson.getString(Constant.LATEST_VIDEO_DURATION));
objItem.setDescription(objJson.getString(Constant.LATEST_VIDEO_DESCRIPTION));
objItem.setImageUrl(objJson.getString(Constant.LATEST_IMAGE_URL));
objItem.setType(objJson.getString(Constant.LATEST_TYPE));
objItem.setViewC(objJson.getString(Constant.LATEST_VIEW));
mListItem.add(objItem);
}
} catch (JSONException e) {
e.printStackTrace();
}
displayData();
}
}
}
@Override
public void onResume() {
super.onResume();
mListItem = latestDatabaseHelper.getFavouriteRecent();
displayData();
}
private void displayData() {
if (getActivity() != null) {
LatestVideoAdapter = new LatestVideoAdapter(getActivity(), mListItem);
recyclerView.setAdapter(LatestVideoAdapter);
}
}
public void showToast(String msg) {
Toast.makeText(getActivity(), msg, Toast.LENGTH_LONG).show();
}
}