Java 如果SQLite中的值为null,则跳过插入
在插入到Android SQLite数据库时,我想跳过用户未填充的值。 但我得到了空指针异常 在我的DBHelper类中,我尝试了“…NOTNULL”和NOTNOTULL选项,但我认为这不是解决方案Java 如果SQLite中的值为null,则跳过插入,java,android,sqlite,Java,Android,Sqlite,在插入到Android SQLite数据库时,我想跳过用户未填充的值。 但我得到了空指针异常 在我的DBHelper类中,我尝试了“…NOTNULL”和NOTNOTULL选项,但我认为这不是解决方案 public void addToDb(View view) { SharedPreferences sharedPreferences = getSharedPreferences("entry",0); float lastlatitude = sharedPreferenc
public void addToDb(View view) {
SharedPreferences sharedPreferences = getSharedPreferences("entry",0);
float lastlatitude = sharedPreferences.getFloat("latitude",0f);
float lastlongitude = sharedPreferences.getFloat("longitude",0f);
if (mTitleInput.getText().length() == 0 ||
mEntryInput.getText().length() == 0) {
return;
}
try {
Date a = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("EEE, MMM d, ''yy");
String o = sdf.format(a);
title = mTitleInput.getText().toString();
entry = mEntryInput.getText().toString();
dateStr = o;
image = getApplicationContext().getFilesDir().getAbsolutePath() + String.valueOf(System.currentTimeMillis()) + ".jpg";
rating = mRatingBar.getRating();
latitude = lastlatitude;
longitude = lastlongitude;
} catch (NumberFormatException ex) {
Log.e(LOG_TAG, "Failed to parse party size text to number: " + ex.getMessage());
}
// Add to mDb
addNewEntry(title, entry, dateStr, image, rating, latitude, longitude);
//clear UI text fields
mTitleInput.getText().clear();
mEntryInput.getText().clear();
}
编辑1:Stacktrace
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.aok.secretdiarywithlock, PID: 29148
java.lang.NullPointerException: Attempt to invoke virtual method 'long android.database.sqlite.SQLiteDatabase.insert(java.lang.String, java.lang.String, android.content.ContentValues)' on a null object reference
at com.aok.secretdiarywithlock.CreateEntry.addNewEntry(CreateEntry.java:157)
at com.aok.secretdiarywithlock.CreateEntry.addToDb(CreateEntry.java:139)
at com.aok.secretdiarywithlock.CreateEntry$1.onClick(CreateEntry.java:93)
at android.view.View.performClick(View.java:6597)
at android.view.View.performClickInternal(View.java:6574)
at android.view.View.access$3100(View.java:778)
at android.view.View$PerformClick.run(View.java:25885)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
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)
编辑2:错误代码
private long addNewEntry(String title, String entry, String date, String image, Float rate, Float latitude, Float longitude){
ContentValues cv = new ContentValues();
cv.put(EntryContract.EntryEntry.COLUMN_TITLE,title);
cv.put(EntryContract.EntryEntry.COLUMN_TEXT,entry);
cv.put(EntryContract.EntryEntry.COLUMN_DATE,date);
cv.put(EntryContract.EntryEntry.COLUMN_IMAGE,image);
cv.put(EntryContract.EntryEntry.COLUMN_TEXT,entry);
cv.put(EntryContract.EntryEntry.COLUMN_RATING,rate);
cv.put(EntryContract.EntryEntry.COLUMN_LOCATION_LAT,latitude);
cv.put(EntryContract.EntryEntry.COLUMN_LOCATION_LONG,longitude);
// Next line is throwing error
return mDb.insert(EntryContract.EntryEntry.TABLE_NAME, null, cv);
}
嗨,例如,你必须检查它们是否为空
dateStr = o == null ? "" : o;
这将检查
o
是否为空,如果为空,则将dateStr设置为空,否则将使用o。您可以将其用于所有变量。您可以发布stacktrace以及获取空值的行号吗?如果值为null
只需传递空string
就可以发布addNewEntry
方法,这就是空指针异常所在的位置错误在哪一行?你能提供代码吗?