如何修复 android java 中的 sqliteException
how to fix sqliteException in android java
我试图将值插入到数据库和内容提供者中，但使用内容提供者得到空 sqlite exception.Before class 我的数据被添加到数据库中，没有任何 problem.after 尝试内容提供商即时通讯异常。我也不知道是否为内容提供者插入了值.....
在 SpecificActivity class 中，我需要使用由 LoadImageAsyncTask class 返回的可绘制对象，但我在那里得到空值...
帮我解决这些问题..
public class FeedReaderContract {
public static class FeedEntry implements BaseColumns {
public static final String TABLE_NAME = "entry";
public static final String _ID = BaseColumns._ID;
public static final String COLUMN_NAME_TITLE = "title";
public static final String COLUMN_NAME_CONTENT = "content";
public static final String COLUMN_NAME_IMAGE = "image";
public static final String COLUMN_NAME_CHANNEL = "channel";
}
}
public class FeedReaderDbHelper extends SQLiteOpenHelper {
public static final int DATABASE_VERSION = 1;
public static final String DATABASE_NAME = "FeedReader.db";
Context context;
public Context getContext() {
return context;
}
private static final String SQL_CREATE_ENTRIES =
"CREATE TABLE " + FeedReaderContract.FeedEntry.TABLE_NAME + " (" +
FeedReaderContract.FeedEntry._ID + " INTEGER PRIMARY KEY, " +
FeedReaderContract.FeedEntry.COLUMN_NAME_TITLE + " TEXT, " +
FeedReaderContract.FeedEntry.COLUMN_NAME_CONTENT + " TEXT, " +
FeedReaderContract.FeedEntry.COLUMN_NAME_CHANNEL + " TEXT, " +
FeedReaderContract.FeedEntry.COLUMN_NAME_IMAGE + " TEXT); ";
private static final String SQL_DELETE_ENTRIES =
"DROP TABLE IF EXISTS " + FeedReaderContract.FeedEntry.TABLE_NAME;
public FeedReaderDbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
this.context = context;
}
public void onCreate(SQLiteDatabase db) {
NewsFeedProvider.db = db;
db.execSQL(SQL_CREATE_ENTRIES);
Log.e("sql db", "created");
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL(SQL_DELETE_ENTRIES);
onCreate(db);
}
public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + FeedReaderContract.FeedEntry.TABLE_NAME);
onCreate(db);
}
public void getData(long id) {
try {
Log.e("entered", "getdata");
SQLiteDatabase db = getReadableDatabase();
Cursor cursor = db.query(FeedReaderContract.FeedEntry.TABLE_NAME, new String[] {
FeedReaderContract.FeedEntry._ID, FeedReaderContract.FeedEntry.COLUMN_NAME_TITLE, FeedReaderContract.FeedEntry.COLUMN_NAME_CHANNEL, FeedReaderContract.FeedEntry.COLUMN_NAME_CONTENT, FeedReaderContract.FeedEntry.COLUMN_NAME_IMAGE
}, FeedReaderContract.FeedEntry._ID + "=?", new String[] {
String.valueOf(id)
}, null, null, null, null);
ArrayList < NewsReport > newsReports = new ArrayList < > ();
List itemIds = new ArrayList < > ();
while (cursor.moveToNext()) {
newsReports.add(new NewsReport(cursor.getString(cursor.getColumnIndex(FeedReaderContract.FeedEntry.COLUMN_NAME_TITLE)),
cursor.getString(cursor.getColumnIndex(FeedReaderContract.FeedEntry.COLUMN_NAME_CHANNEL)),
cursor.getString(cursor.getColumnIndex(FeedReaderContract.FeedEntry.COLUMN_NAME_CONTENT)),
cursor.getString(cursor.getColumnIndex(FeedReaderContract.FeedEntry.COLUMN_NAME_IMAGE))));
long itemId = cursor.getLong(
cursor.getColumnIndexOrThrow(FeedReaderContract.FeedEntry._ID));
itemIds.add(itemId);
Log.e("id", "" + itemId);
}
cursor.close();
Log.e("newsreportsize", "dbhelper" + newsReports.size());
if (newsReports.size() != 0) {
for (int i = 0; i < newsReports.size(); i++) {
Log.e("news pic", "" + newsReports.get(i).getPic());
Log.e("news title", "" + newsReports.get(i).getTitle());
Log.e("news content", "" + newsReports.get(i).getContent());
Log.e("news chanel", "" + newsReports.get(i).getNewsChannel());
}
}
} catch (Exception ex) {
Log.e("exception req data", "" + ex);
}
}
}
public class LoadImageAsyncTask extends AsyncTask < String, Void, Drawable > {
private Drawable drawable;
String imageUrl;
private Drawable image;
@Override
protected Drawable doInBackground(String...strings) {
try {
InputStream is = (InputStream) new URL(imageUrl).getContent();
Drawable d = Drawable.createFromStream(is, "src name");
Log.e("drwable", "" + d);
} catch (Exception e) {
Log.e("Specific Activity", "Converting drawable" + e);
}
return drawable;
}
@Override
protected void onPostExecute(Drawable drawableImage) {
super.onPostExecute(drawableImage);
setImage(drawableImage);
}
public void setImage(Drawable drawable) {
new SpecificNewsReportActivity().drawable = drawable;
Log.e("set image", "" + drawable);
this.drawable = drawable;
}
public Drawable getImage() {
Log.e("get image", "" + drawable);
return drawable;
}
}
public class NewsFeedProvider extends ContentProvider {
static final String PROVIDER_NAME = "com.example.newsreport";
static final String URL = "content://" + PROVIDER_NAME + "/newsfeed";
static final Uri CONTENT_URL = Uri.parse(URL);
static final int uriCode = 1;
static String newsTitle;
static String newsContent;
static String newsImage;
static String newsChannel;
static final UriMatcher uriMatcher;
private FeedReaderDbHelper dbHelper;
private static HashMap < String, String > values;
public static SQLiteDatabase db;
static {
uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
uriMatcher.addURI(PROVIDER_NAME, "newsfeed", uriCode);
}
@Override
public boolean onCreate() {
dbHelper = new FeedReaderDbHelper(getContext());
return true;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
queryBuilder.setTables(FeedReaderContract.FeedEntry.TABLE_NAME);
switch (uriMatcher.match(uri)) {
case uriCode:
queryBuilder.setProjectionMap(values);
break;
default:
throw new IllegalArgumentException("Unknown URI" + uri);
}
//Cursor cursor=queryBuilder.query(dbHelper.getReadableDatabase(),projection,selection,selectionArgs,null,null,sortOrder);
Cursor cursor = dbHelper.getReadableDatabase().query(FeedReaderContract.FeedEntry.TABLE_NAME, projection, FeedReaderContract.FeedEntry.COLUMN_NAME_TITLE + "= ?", selectionArgs, null, null, sortOrder);
cursor.setNotificationUri(getContext().getContentResolver(), uri);
return cursor;
}
@Override
public String getType(Uri uri) {
switch (uriMatcher.match(uri)) {
case uriCode:
return "vnd.android.cursor.dir/newsfeed";
default:
throw new IllegalArgumentException("Unsupported URI" + uri);
}
}
@Override
public Uri insert(Uri uri, ContentValues contentValues) {
SQLiteDatabase db = dbHelper.getWritableDatabase();
long rowId = db.insert(FeedReaderContract.FeedEntry.TABLE_NAME, null, contentValues);
if (rowId > 0) {
Uri _uri = ContentUris.withAppendedId(CONTENT_URL, rowId);
getContext().getContentResolver().notifyChange(_uri, null);
Log.e("insert", "feedreader" + contentValues);
return _uri;
} else {
Toast.makeText(getContext(), "Row insert failed", Toast.LENGTH_SHORT).show();
return null;
}
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
int rowsDeleted = 0;
SQLiteDatabase db = dbHelper.getWritableDatabase();
switch (uriMatcher.match(uri)) {
case uriCode:
rowsDeleted = db.delete(FeedReaderContract.FeedEntry.TABLE_NAME, selection, selectionArgs);
break;
default:
throw new IllegalArgumentException("Unknown URI" + uri);
}
getContext().getContentResolver().notifyChange(uri, null);
return rowsDeleted;
}
@Override
public int update(Uri uri, ContentValues contentValues, String selection, String[] selectionArgs) {
int rowsUpdated = 0;
SQLiteDatabase db = dbHelper.getWritableDatabase();
switch (uriMatcher.match(uri)) {
case uriCode:
rowsUpdated = db.delete(FeedReaderContract.FeedEntry.TABLE_NAME, selection, selectionArgs);
break;
default:
throw new IllegalArgumentException("Unknown URI" + uri);
}
getContext().getContentResolver().notifyChange(uri, null);
return rowsUpdated;
}
}
public class NewsReportActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks < ArrayList < NewsReport >> {
ProgressBar progressBar;
FeedReaderDbHelper dbHelper;
SQLiteDatabase db;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.recycler_view);
dbHelper = new FeedReaderDbHelper(this);
db = dbHelper.getWritableDatabase();
Log.e("application", "" + dbHelper);
Intent intent = getIntent();
if (intent.hasExtra("exception")) {
TextView connectionTextView = (TextView) findViewById(R.id.no_connection_text_view);
connectionTextView.setText("There is no internet connection!!!");
} else {
Log.e("no exception", "entered else");
}
getSupportLoaderManager().initLoader(0, null, this);
}
@NonNull
@Override
public Loader < ArrayList < NewsReport >> onCreateLoader(int id, @Nullable Bundle args) {
NewsReportLoader newsReportLoader = new NewsReportLoader(this);
newsReportLoader.forceLoad();
progressBar = (ProgressBar) findViewById(R.id.progress_bar);
progressBar.setVisibility(View.VISIBLE);
return newsReportLoader;
}
@Override
public void onLoadFinished(@NonNull Loader < ArrayList < NewsReport >> loader, ArrayList < NewsReport > data) {
try {
Log.e("data", "" + data.size());
NewsReportAdapter adapter = new NewsReportAdapter(this, data);
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
progressBar.setVisibility(View.INVISIBLE);
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
DividerItemDecoration mDividerItemDecoration = new DividerItemDecoration(recyclerView.getContext(),
new LinearLayoutManager(this).getOrientation());
recyclerView.addItemDecoration(mDividerItemDecoration);
if (dbHelper != null) {
Log.e("dbhelper", "notnull");
db = dbHelper.getWritableDatabase();
if (db != null) {
Log.e("db", "notnull");
for (int i = 0; i < data.size(); i++) {
ContentValues values = new ContentValues();
NewsReport newsReport = data.get(i);
values.put(FeedReaderContract.FeedEntry.COLUMN_NAME_TITLE, newsReport.getTitle());
values.put(FeedReaderContract.FeedEntry.COLUMN_NAME_CONTENT, newsReport.getContent());
values.put(FeedReaderContract.FeedEntry.COLUMN_NAME_CHANNEL, newsReport.getNewsChannel());
values.put(FeedReaderContract.FeedEntry.COLUMN_NAME_IMAGE, newsReport.getPic());
values.put(NewsFeedProvider.newsTitle, newsReport.getTitle());
values.put(NewsFeedProvider.newsContent, newsReport.getContent());
values.put(NewsFeedProvider.newsChannel, newsReport.getNewsChannel());
values.put(NewsFeedProvider.newsImage, newsReport.getPic());
try {
Uri uri = getApplicationContext().getContentResolver().insert(NewsFeedProvider.CONTENT_URL, values);
} catch (Exception ex) {
Log.e("exception in resolver" + getContentResolver(), "" + ex);
}
long newRowId = db.insert(FeedReaderContract.FeedEntry.TABLE_NAME, null, values);
Log.e("new row id", "" + newRowId);
dbHelper.getData(newRowId);
}
} else
Log.e("db", "null");
} else {
Log.e("dbhelper", "null");
}
// db.execSQL("delete from "+ FeedReaderContract.FeedEntry.TABLE_NAME);
} catch (Exception ex) {
Log.e("newsactivity", "" + FeedReaderContract.FeedEntry.TABLE_NAME.length());
Log.e("onloadfinished", "" + ex);
Log.e("datahelper", "" + dbHelper.getReadableDatabase().rawQuery("SELECT * FROM " + FeedReaderContract.FeedEntry.TABLE_NAME, null));
}
}
@Override
public void onLoaderReset(@NonNull Loader < ArrayList < NewsReport >> loader) {
}
}
public class SpecificNewsReportActivity extends AppCompatActivity {
private TextView contentTextView, titleTextView;
public ImageView imageView;
private Intent intent;
public Drawable drawable;
private String imageUrl;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_specific_news_report);
ActionBar actionBar = this.getSupportActionBar();
if (actionBar != null) {
actionBar.setDisplayHomeAsUpEnabled(true);
}
intent = getIntent();
LoadImageAsyncTask task = new LoadImageAsyncTask();
AsyncTask < String, Void, Drawable > d = task.execute();
try {
drawable = d.get();
} catch (ExecutionException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
imageUrl = getIntent().getStringExtra("image");
Log.e("drawable specific", "" + drawable);
drawable = new LoadImageAsyncTask().getImage();
contentTextView = (TextView) findViewById(R.id.specific_news_report_content_text_view);
titleTextView = (TextView) findViewById(R.id.specific_news_report_title_text_view);
imageView = (ImageView) findViewById(R.id.specific_news_report_image_view);
contentTextView.setText(intent.getStringExtra("content"));
titleTextView.setText(intent.getStringExtra("title"));
try {
if (drawable != null) {
imageView.setImageDrawable(drawable);
} else {
Log.e("returned drawable", "null");
}
} catch (Exception ex) {
Log.e("enna exception", "" + ex);
}
}
@Override
public boolean onOptionsItemSelected(@NonNull MenuItem item) {
int id = item.getItemId();
if (id == android.R.id.home) {
Intent intent = NavUtils.getParentActivityIntent(this);
NavUtils.navigateUpTo(this, intent);
}
return super.onOptionsItemSelected(item);
}
}
堆栈跟踪
2019-07-29 13:57:20.172 24098-24098/com.example.newsreport E/SQLiteLog: (1) near "null": syntax error
2019-07-29 13:57:20.177 24098-24098/com.example.newsreport E/SQLiteDatabase: Error inserting channel=News18.com null=https://images.news18.com/ibnlive/uploads/2019/07/yediyurappa-1.jpg image=https://images.news18.com/ibnlive/uploads/2019/07/yediyurappa-1.jpg title=Karnataka Assembly Trust Vote LIVE: Yediyurappa Wins Floor Test, Speaker Ramesh Kumar Resigns - News18 content=Eleven Congress MLAs and three JDS lawmakers faced the axe from the Speaker in addition to the three disqualified earlier, bringing down the majority mark to 104, one less than the current strength of 105 of the BJP, which also enjoys the support of an Indepe… [+3489 chars]
android.database.sqlite.SQLiteException: near "null": syntax error (code 1 SQLITE_ERROR): , while compiling: INSERT INTO entry(channel,null,image,title,content) VALUES (?,?,?,?,?)
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:903)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:514)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1562)
at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1433)
at com.example.newsreport.NewsFeedProvider.insert(NewsFeedProvider.java:78)
at android.content.ContentProvider$Transport.insert(ContentProvider.java:265)
at android.content.ContentResolver.insert(ContentResolver.java:1587)
at com.example.newsreport.NewsReportActivity.onLoadFinished(NewsReportActivity.java:96)
at com.example.newsreport.NewsReportActivity.onLoadFinished(NewsReportActivity.java:29)
at androidx.loader.app.LoaderManagerImpl$LoaderObserver.onChanged(LoaderManagerImpl.java:250)
at androidx.lifecycle.LiveData.considerNotify(LiveData.java:113)
at androidx.lifecycle.LiveData.dispatchingValue(LiveData.java:131)
at androidx.lifecycle.LiveData.setValue(LiveData.java:289)
at androidx.lifecycle.MutableLiveData.setValue(MutableLiveData.java:33)
at androidx.loader.app.LoaderManagerImpl$LoaderInfo.setValue(LoaderManagerImpl.java:189)
at androidx.loader.app.LoaderManagerImpl$LoaderInfo.onLoadComplete(LoaderManagerImpl.java:174)
at androidx.loader.content.Loader.deliverResult(Loader.java:132)
at androidx.loader.content.AsyncTaskLoader.dispatchOnLoadComplete(AsyncTaskLoader.java:258)
at androidx.loader.content.AsyncTaskLoader$LoadTask.onPostExecute(AsyncTaskLoader.java:83)
at androidx.loader.content.ModernAsyncTask.finish(ModernAsyncTask.java:490)
at androidx.loader.content.ModernAsyncTask$InternalHandler.handleMessage(ModernAsyncTask.java:507)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
2019-07-29 13:57:20.218 24098-24098/com.example.newsreport E/SQLiteLog: (1) near "null": syntax error
2019-07-29 13:57:20.220 24098-24098/com.example.newsreport E/SQLiteDatabase: Error inserting channel=News18.com null=https://images.news18.com/ibnlive/uploads/2019/07/yediyurappa-1.jpg image=https://images.news18.com/ibnlive/uploads/2019/07/yediyurappa-1.jpg title=Karnataka Assembly Trust Vote LIVE: Yediyurappa Wins Floor Test, Speaker Ramesh Kumar Resigns - News18 content=Eleven Congress MLAs and three JDS lawmakers faced the axe from the Speaker in addition to the three disqualified earlier, bringing down the majority mark to 104, one less than the current strength of 105 of the BJP, which also enjoys the support of an Indepe… [+3489 chars]
android.database.sqlite.SQLiteException: near "null": syntax error (code 1 SQLITE_ERROR): , while compiling: INSERT INTO entry(channel,null,image,title,content) VALUES (?,?,?,?,?)
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:903)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:514)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1562)
at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1433)
at com.example.newsreport.NewsReportActivity.onLoadFinished(NewsReportActivity.java:102)
at com.example.newsreport.NewsReportActivity.onLoadFinished(NewsReportActivity.java:29)
at androidx.loader.app.LoaderManagerImpl$LoaderObserver.onChanged(LoaderManagerImpl.java:250)
at androidx.lifecycle.LiveData.considerNotify(LiveData.java:113)
我需要使用从 loadimageasynctask 返回的 drawable
我需要将所有数据以及内容提供商存储在数据库中
在 table 中有 4 列和主键。
当你插入一个新行时，你为 ContentValues 对象提供了值，但你为每一列做了两次：
values.put(FeedReaderContract.FeedEntry.COLUMN_NAME_TITLE, newsReport.getTitle());
values.put(FeedReaderContract.FeedEntry.COLUMN_NAME_CONTENT, newsReport.getContent());
values.put(FeedReaderContract.FeedEntry.COLUMN_NAME_CHANNEL, newsReport.getNewsChannel());
values.put(FeedReaderContract.FeedEntry.COLUMN_NAME_IMAGE, newsReport.getPic());
values.put(NewsFeedProvider.newsTitle, newsReport.getTitle());
values.put(NewsFeedProvider.newsContent, newsReport.getContent());
values.put(NewsFeedProvider.newsChannel, newsReport.getNewsChannel());
values.put(NewsFeedProvider.newsImage, newsReport.getPic());
为什么？
我怀疑其中之一：
NewsFeedProvider.newsTitle
NewsFeedProvider.newsContent
NewsFeedProvider.newsChannel
NewsFeedProvider.newsImage
returns null.
所以删除这些行：
values.put(NewsFeedProvider.newsTitle, newsReport.getTitle());
values.put(NewsFeedProvider.newsContent, newsReport.getContent());
values.put(NewsFeedProvider.newsChannel, newsReport.getNewsChannel());
values.put(NewsFeedProvider.newsImage, newsReport.getPic());
不需要它们。
列的值由前 4 行设置。
我试图将值插入到数据库和内容提供者中，但使用内容提供者得到空 sqlite exception.Before class 我的数据被添加到数据库中，没有任何 problem.after 尝试内容提供商即时通讯异常。我也不知道是否为内容提供者插入了值..... 在 SpecificActivity class 中，我需要使用由 LoadImageAsyncTask class 返回的可绘制对象，但我在那里得到空值... 帮我解决这些问题..
public class FeedReaderContract {
public static class FeedEntry implements BaseColumns {
public static final String TABLE_NAME = "entry";
public static final String _ID = BaseColumns._ID;
public static final String COLUMN_NAME_TITLE = "title";
public static final String COLUMN_NAME_CONTENT = "content";
public static final String COLUMN_NAME_IMAGE = "image";
public static final String COLUMN_NAME_CHANNEL = "channel";
}
}
public class FeedReaderDbHelper extends SQLiteOpenHelper {
public static final int DATABASE_VERSION = 1;
public static final String DATABASE_NAME = "FeedReader.db";
Context context;
public Context getContext() {
return context;
}
private static final String SQL_CREATE_ENTRIES =
"CREATE TABLE " + FeedReaderContract.FeedEntry.TABLE_NAME + " (" +
FeedReaderContract.FeedEntry._ID + " INTEGER PRIMARY KEY, " +
FeedReaderContract.FeedEntry.COLUMN_NAME_TITLE + " TEXT, " +
FeedReaderContract.FeedEntry.COLUMN_NAME_CONTENT + " TEXT, " +
FeedReaderContract.FeedEntry.COLUMN_NAME_CHANNEL + " TEXT, " +
FeedReaderContract.FeedEntry.COLUMN_NAME_IMAGE + " TEXT); ";
private static final String SQL_DELETE_ENTRIES =
"DROP TABLE IF EXISTS " + FeedReaderContract.FeedEntry.TABLE_NAME;
public FeedReaderDbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
this.context = context;
}
public void onCreate(SQLiteDatabase db) {
NewsFeedProvider.db = db;
db.execSQL(SQL_CREATE_ENTRIES);
Log.e("sql db", "created");
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL(SQL_DELETE_ENTRIES);
onCreate(db);
}
public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + FeedReaderContract.FeedEntry.TABLE_NAME);
onCreate(db);
}
public void getData(long id) {
try {
Log.e("entered", "getdata");
SQLiteDatabase db = getReadableDatabase();
Cursor cursor = db.query(FeedReaderContract.FeedEntry.TABLE_NAME, new String[] {
FeedReaderContract.FeedEntry._ID, FeedReaderContract.FeedEntry.COLUMN_NAME_TITLE, FeedReaderContract.FeedEntry.COLUMN_NAME_CHANNEL, FeedReaderContract.FeedEntry.COLUMN_NAME_CONTENT, FeedReaderContract.FeedEntry.COLUMN_NAME_IMAGE
}, FeedReaderContract.FeedEntry._ID + "=?", new String[] {
String.valueOf(id)
}, null, null, null, null);
ArrayList < NewsReport > newsReports = new ArrayList < > ();
List itemIds = new ArrayList < > ();
while (cursor.moveToNext()) {
newsReports.add(new NewsReport(cursor.getString(cursor.getColumnIndex(FeedReaderContract.FeedEntry.COLUMN_NAME_TITLE)),
cursor.getString(cursor.getColumnIndex(FeedReaderContract.FeedEntry.COLUMN_NAME_CHANNEL)),
cursor.getString(cursor.getColumnIndex(FeedReaderContract.FeedEntry.COLUMN_NAME_CONTENT)),
cursor.getString(cursor.getColumnIndex(FeedReaderContract.FeedEntry.COLUMN_NAME_IMAGE))));
long itemId = cursor.getLong(
cursor.getColumnIndexOrThrow(FeedReaderContract.FeedEntry._ID));
itemIds.add(itemId);
Log.e("id", "" + itemId);
}
cursor.close();
Log.e("newsreportsize", "dbhelper" + newsReports.size());
if (newsReports.size() != 0) {
for (int i = 0; i < newsReports.size(); i++) {
Log.e("news pic", "" + newsReports.get(i).getPic());
Log.e("news title", "" + newsReports.get(i).getTitle());
Log.e("news content", "" + newsReports.get(i).getContent());
Log.e("news chanel", "" + newsReports.get(i).getNewsChannel());
}
}
} catch (Exception ex) {
Log.e("exception req data", "" + ex);
}
}
}
public class LoadImageAsyncTask extends AsyncTask < String, Void, Drawable > {
private Drawable drawable;
String imageUrl;
private Drawable image;
@Override
protected Drawable doInBackground(String...strings) {
try {
InputStream is = (InputStream) new URL(imageUrl).getContent();
Drawable d = Drawable.createFromStream(is, "src name");
Log.e("drwable", "" + d);
} catch (Exception e) {
Log.e("Specific Activity", "Converting drawable" + e);
}
return drawable;
}
@Override
protected void onPostExecute(Drawable drawableImage) {
super.onPostExecute(drawableImage);
setImage(drawableImage);
}
public void setImage(Drawable drawable) {
new SpecificNewsReportActivity().drawable = drawable;
Log.e("set image", "" + drawable);
this.drawable = drawable;
}
public Drawable getImage() {
Log.e("get image", "" + drawable);
return drawable;
}
}
public class NewsFeedProvider extends ContentProvider {
static final String PROVIDER_NAME = "com.example.newsreport";
static final String URL = "content://" + PROVIDER_NAME + "/newsfeed";
static final Uri CONTENT_URL = Uri.parse(URL);
static final int uriCode = 1;
static String newsTitle;
static String newsContent;
static String newsImage;
static String newsChannel;
static final UriMatcher uriMatcher;
private FeedReaderDbHelper dbHelper;
private static HashMap < String, String > values;
public static SQLiteDatabase db;
static {
uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
uriMatcher.addURI(PROVIDER_NAME, "newsfeed", uriCode);
}
@Override
public boolean onCreate() {
dbHelper = new FeedReaderDbHelper(getContext());
return true;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
queryBuilder.setTables(FeedReaderContract.FeedEntry.TABLE_NAME);
switch (uriMatcher.match(uri)) {
case uriCode:
queryBuilder.setProjectionMap(values);
break;
default:
throw new IllegalArgumentException("Unknown URI" + uri);
}
//Cursor cursor=queryBuilder.query(dbHelper.getReadableDatabase(),projection,selection,selectionArgs,null,null,sortOrder);
Cursor cursor = dbHelper.getReadableDatabase().query(FeedReaderContract.FeedEntry.TABLE_NAME, projection, FeedReaderContract.FeedEntry.COLUMN_NAME_TITLE + "= ?", selectionArgs, null, null, sortOrder);
cursor.setNotificationUri(getContext().getContentResolver(), uri);
return cursor;
}
@Override
public String getType(Uri uri) {
switch (uriMatcher.match(uri)) {
case uriCode:
return "vnd.android.cursor.dir/newsfeed";
default:
throw new IllegalArgumentException("Unsupported URI" + uri);
}
}
@Override
public Uri insert(Uri uri, ContentValues contentValues) {
SQLiteDatabase db = dbHelper.getWritableDatabase();
long rowId = db.insert(FeedReaderContract.FeedEntry.TABLE_NAME, null, contentValues);
if (rowId > 0) {
Uri _uri = ContentUris.withAppendedId(CONTENT_URL, rowId);
getContext().getContentResolver().notifyChange(_uri, null);
Log.e("insert", "feedreader" + contentValues);
return _uri;
} else {
Toast.makeText(getContext(), "Row insert failed", Toast.LENGTH_SHORT).show();
return null;
}
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
int rowsDeleted = 0;
SQLiteDatabase db = dbHelper.getWritableDatabase();
switch (uriMatcher.match(uri)) {
case uriCode:
rowsDeleted = db.delete(FeedReaderContract.FeedEntry.TABLE_NAME, selection, selectionArgs);
break;
default:
throw new IllegalArgumentException("Unknown URI" + uri);
}
getContext().getContentResolver().notifyChange(uri, null);
return rowsDeleted;
}
@Override
public int update(Uri uri, ContentValues contentValues, String selection, String[] selectionArgs) {
int rowsUpdated = 0;
SQLiteDatabase db = dbHelper.getWritableDatabase();
switch (uriMatcher.match(uri)) {
case uriCode:
rowsUpdated = db.delete(FeedReaderContract.FeedEntry.TABLE_NAME, selection, selectionArgs);
break;
default:
throw new IllegalArgumentException("Unknown URI" + uri);
}
getContext().getContentResolver().notifyChange(uri, null);
return rowsUpdated;
}
}
public class NewsReportActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks < ArrayList < NewsReport >> {
ProgressBar progressBar;
FeedReaderDbHelper dbHelper;
SQLiteDatabase db;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.recycler_view);
dbHelper = new FeedReaderDbHelper(this);
db = dbHelper.getWritableDatabase();
Log.e("application", "" + dbHelper);
Intent intent = getIntent();
if (intent.hasExtra("exception")) {
TextView connectionTextView = (TextView) findViewById(R.id.no_connection_text_view);
connectionTextView.setText("There is no internet connection!!!");
} else {
Log.e("no exception", "entered else");
}
getSupportLoaderManager().initLoader(0, null, this);
}
@NonNull
@Override
public Loader < ArrayList < NewsReport >> onCreateLoader(int id, @Nullable Bundle args) {
NewsReportLoader newsReportLoader = new NewsReportLoader(this);
newsReportLoader.forceLoad();
progressBar = (ProgressBar) findViewById(R.id.progress_bar);
progressBar.setVisibility(View.VISIBLE);
return newsReportLoader;
}
@Override
public void onLoadFinished(@NonNull Loader < ArrayList < NewsReport >> loader, ArrayList < NewsReport > data) {
try {
Log.e("data", "" + data.size());
NewsReportAdapter adapter = new NewsReportAdapter(this, data);
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
progressBar.setVisibility(View.INVISIBLE);
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
DividerItemDecoration mDividerItemDecoration = new DividerItemDecoration(recyclerView.getContext(),
new LinearLayoutManager(this).getOrientation());
recyclerView.addItemDecoration(mDividerItemDecoration);
if (dbHelper != null) {
Log.e("dbhelper", "notnull");
db = dbHelper.getWritableDatabase();
if (db != null) {
Log.e("db", "notnull");
for (int i = 0; i < data.size(); i++) {
ContentValues values = new ContentValues();
NewsReport newsReport = data.get(i);
values.put(FeedReaderContract.FeedEntry.COLUMN_NAME_TITLE, newsReport.getTitle());
values.put(FeedReaderContract.FeedEntry.COLUMN_NAME_CONTENT, newsReport.getContent());
values.put(FeedReaderContract.FeedEntry.COLUMN_NAME_CHANNEL, newsReport.getNewsChannel());
values.put(FeedReaderContract.FeedEntry.COLUMN_NAME_IMAGE, newsReport.getPic());
values.put(NewsFeedProvider.newsTitle, newsReport.getTitle());
values.put(NewsFeedProvider.newsContent, newsReport.getContent());
values.put(NewsFeedProvider.newsChannel, newsReport.getNewsChannel());
values.put(NewsFeedProvider.newsImage, newsReport.getPic());
try {
Uri uri = getApplicationContext().getContentResolver().insert(NewsFeedProvider.CONTENT_URL, values);
} catch (Exception ex) {
Log.e("exception in resolver" + getContentResolver(), "" + ex);
}
long newRowId = db.insert(FeedReaderContract.FeedEntry.TABLE_NAME, null, values);
Log.e("new row id", "" + newRowId);
dbHelper.getData(newRowId);
}
} else
Log.e("db", "null");
} else {
Log.e("dbhelper", "null");
}
// db.execSQL("delete from "+ FeedReaderContract.FeedEntry.TABLE_NAME);
} catch (Exception ex) {
Log.e("newsactivity", "" + FeedReaderContract.FeedEntry.TABLE_NAME.length());
Log.e("onloadfinished", "" + ex);
Log.e("datahelper", "" + dbHelper.getReadableDatabase().rawQuery("SELECT * FROM " + FeedReaderContract.FeedEntry.TABLE_NAME, null));
}
}
@Override
public void onLoaderReset(@NonNull Loader < ArrayList < NewsReport >> loader) {
}
}
public class SpecificNewsReportActivity extends AppCompatActivity {
private TextView contentTextView, titleTextView;
public ImageView imageView;
private Intent intent;
public Drawable drawable;
private String imageUrl;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_specific_news_report);
ActionBar actionBar = this.getSupportActionBar();
if (actionBar != null) {
actionBar.setDisplayHomeAsUpEnabled(true);
}
intent = getIntent();
LoadImageAsyncTask task = new LoadImageAsyncTask();
AsyncTask < String, Void, Drawable > d = task.execute();
try {
drawable = d.get();
} catch (ExecutionException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
imageUrl = getIntent().getStringExtra("image");
Log.e("drawable specific", "" + drawable);
drawable = new LoadImageAsyncTask().getImage();
contentTextView = (TextView) findViewById(R.id.specific_news_report_content_text_view);
titleTextView = (TextView) findViewById(R.id.specific_news_report_title_text_view);
imageView = (ImageView) findViewById(R.id.specific_news_report_image_view);
contentTextView.setText(intent.getStringExtra("content"));
titleTextView.setText(intent.getStringExtra("title"));
try {
if (drawable != null) {
imageView.setImageDrawable(drawable);
} else {
Log.e("returned drawable", "null");
}
} catch (Exception ex) {
Log.e("enna exception", "" + ex);
}
}
@Override
public boolean onOptionsItemSelected(@NonNull MenuItem item) {
int id = item.getItemId();
if (id == android.R.id.home) {
Intent intent = NavUtils.getParentActivityIntent(this);
NavUtils.navigateUpTo(this, intent);
}
return super.onOptionsItemSelected(item);
}
}
堆栈跟踪
2019-07-29 13:57:20.172 24098-24098/com.example.newsreport E/SQLiteLog: (1) near "null": syntax error
2019-07-29 13:57:20.177 24098-24098/com.example.newsreport E/SQLiteDatabase: Error inserting channel=News18.com null=https://images.news18.com/ibnlive/uploads/2019/07/yediyurappa-1.jpg image=https://images.news18.com/ibnlive/uploads/2019/07/yediyurappa-1.jpg title=Karnataka Assembly Trust Vote LIVE: Yediyurappa Wins Floor Test, Speaker Ramesh Kumar Resigns - News18 content=Eleven Congress MLAs and three JDS lawmakers faced the axe from the Speaker in addition to the three disqualified earlier, bringing down the majority mark to 104, one less than the current strength of 105 of the BJP, which also enjoys the support of an Indepe… [+3489 chars]
android.database.sqlite.SQLiteException: near "null": syntax error (code 1 SQLITE_ERROR): , while compiling: INSERT INTO entry(channel,null,image,title,content) VALUES (?,?,?,?,?)
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:903)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:514)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1562)
at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1433)
at com.example.newsreport.NewsFeedProvider.insert(NewsFeedProvider.java:78)
at android.content.ContentProvider$Transport.insert(ContentProvider.java:265)
at android.content.ContentResolver.insert(ContentResolver.java:1587)
at com.example.newsreport.NewsReportActivity.onLoadFinished(NewsReportActivity.java:96)
at com.example.newsreport.NewsReportActivity.onLoadFinished(NewsReportActivity.java:29)
at androidx.loader.app.LoaderManagerImpl$LoaderObserver.onChanged(LoaderManagerImpl.java:250)
at androidx.lifecycle.LiveData.considerNotify(LiveData.java:113)
at androidx.lifecycle.LiveData.dispatchingValue(LiveData.java:131)
at androidx.lifecycle.LiveData.setValue(LiveData.java:289)
at androidx.lifecycle.MutableLiveData.setValue(MutableLiveData.java:33)
at androidx.loader.app.LoaderManagerImpl$LoaderInfo.setValue(LoaderManagerImpl.java:189)
at androidx.loader.app.LoaderManagerImpl$LoaderInfo.onLoadComplete(LoaderManagerImpl.java:174)
at androidx.loader.content.Loader.deliverResult(Loader.java:132)
at androidx.loader.content.AsyncTaskLoader.dispatchOnLoadComplete(AsyncTaskLoader.java:258)
at androidx.loader.content.AsyncTaskLoader$LoadTask.onPostExecute(AsyncTaskLoader.java:83)
at androidx.loader.content.ModernAsyncTask.finish(ModernAsyncTask.java:490)
at androidx.loader.content.ModernAsyncTask$InternalHandler.handleMessage(ModernAsyncTask.java:507)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
2019-07-29 13:57:20.218 24098-24098/com.example.newsreport E/SQLiteLog: (1) near "null": syntax error
2019-07-29 13:57:20.220 24098-24098/com.example.newsreport E/SQLiteDatabase: Error inserting channel=News18.com null=https://images.news18.com/ibnlive/uploads/2019/07/yediyurappa-1.jpg image=https://images.news18.com/ibnlive/uploads/2019/07/yediyurappa-1.jpg title=Karnataka Assembly Trust Vote LIVE: Yediyurappa Wins Floor Test, Speaker Ramesh Kumar Resigns - News18 content=Eleven Congress MLAs and three JDS lawmakers faced the axe from the Speaker in addition to the three disqualified earlier, bringing down the majority mark to 104, one less than the current strength of 105 of the BJP, which also enjoys the support of an Indepe… [+3489 chars]
android.database.sqlite.SQLiteException: near "null": syntax error (code 1 SQLITE_ERROR): , while compiling: INSERT INTO entry(channel,null,image,title,content) VALUES (?,?,?,?,?)
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:903)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:514)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1562)
at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1433)
at com.example.newsreport.NewsReportActivity.onLoadFinished(NewsReportActivity.java:102)
at com.example.newsreport.NewsReportActivity.onLoadFinished(NewsReportActivity.java:29)
at androidx.loader.app.LoaderManagerImpl$LoaderObserver.onChanged(LoaderManagerImpl.java:250)
at androidx.lifecycle.LiveData.considerNotify(LiveData.java:113)
我需要使用从 loadimageasynctask 返回的 drawable 我需要将所有数据以及内容提供商存储在数据库中
在 table 中有 4 列和主键。
当你插入一个新行时，你为 ContentValues 对象提供了值，但你为每一列做了两次：
values.put(FeedReaderContract.FeedEntry.COLUMN_NAME_TITLE, newsReport.getTitle());
values.put(FeedReaderContract.FeedEntry.COLUMN_NAME_CONTENT, newsReport.getContent());
values.put(FeedReaderContract.FeedEntry.COLUMN_NAME_CHANNEL, newsReport.getNewsChannel());
values.put(FeedReaderContract.FeedEntry.COLUMN_NAME_IMAGE, newsReport.getPic());
values.put(NewsFeedProvider.newsTitle, newsReport.getTitle());
values.put(NewsFeedProvider.newsContent, newsReport.getContent());
values.put(NewsFeedProvider.newsChannel, newsReport.getNewsChannel());
values.put(NewsFeedProvider.newsImage, newsReport.getPic());
为什么？
我怀疑其中之一：
NewsFeedProvider.newsTitle
NewsFeedProvider.newsContent
NewsFeedProvider.newsChannel
NewsFeedProvider.newsImage
returns null.
所以删除这些行：
values.put(NewsFeedProvider.newsTitle, newsReport.getTitle());
values.put(NewsFeedProvider.newsContent, newsReport.getContent());
values.put(NewsFeedProvider.newsChannel, newsReport.getNewsChannel());
values.put(NewsFeedProvider.newsImage, newsReport.getPic());
不需要它们。
列的值由前 4 行设置。