大家好我正在构建一个具有timepicker的android应用程序。我想要的是我想在用户点击两次保存按钮时更新数据库。请指导我如何做到这一点。现在我的应用程序崩溃了，因为没有更新数据库。
TimeTable.java
public class Monday extends FragmentActivity implements TimePickerFragment.TimePickerDialogListener {
EditText et1, et2, et3;
TextView tvm;
LinearLayout llm;
int fhour, fmin, thour, tmin, j;
private int cnt = 0;
View vi[] = new View[100];
TimeTableDbHelper db;
String txt,fmeridien,tmeridien,ftime,ttime;
private static final int START_TIME_PICKER_ID = 1;
private static final int END_TIME_PICKER_ID = 2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent = getIntent();
setContentView(R.layout.activity_monday);
tvm = (TextView) findViewById(R.id.tvm);
llm = (LinearLayout) findViewById(R.id.llm);
db = new TimeTableDbHelper(this);
cnt = db.check("timetableM");
if (cnt > 0) {
int i;
for (i = 0; i < cnt; i++) {
LinearLayout mn = (LinearLayout) findViewById(R.id.llm);
View view = getLayoutInflater().inflate(R.layout.activity_timepicker, mn, false);
vi[i] = view;
mn.addView(view);
et1 = (EditText) vi[i].findViewById(R.id.txtTime);
et1.setText(db.rd1(i,1));
//Log.i("Monday", "Database read" + db.read(2) + db.read(3));
et2 = (EditText) vi[i].findViewById(R.id.txtTime2);
et2.setText(db.rd1(i,2));
//Log.i("Monday", "Database read" + db.read(4) + db.read(5));
et3 = (EditText) vi[i].findViewById(R.id.txtSet);
et3.setText(db.rd1(i,3));
}
j = i;
} else {
j = 0;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_monday, 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
return super.onOptionsItemSelected(item);
}
public void setTime(View v) {
LinearLayout main = (LinearLayout) findViewById(R.id.llm);
View view = getLayoutInflater().inflate(R.layout.activity_timepicker, main, false);
view.setTag(j);
main.addView(view);
vi[j] = view;
}
public void setTime2(View v) {
DialogFragment newFragment = TimePickerFragment.newInstance(START_TIME_PICKER_ID);
newFragment.show(getFragmentManager(), "timePicker");
}
public void setTime3(View v) {
DialogFragment newFragment = TimePickerFragment.newInstance(END_TIME_PICKER_ID);
newFragment.show(getFragmentManager(), "timePicker");
}
@Override
public void onTimeSet(int id, TimePicker view, int hourOfDay, int minute) {
Log.i("TimePicker", "Time picker set from id " + id + "!");
if (id == START_TIME_PICKER_ID) {
et1 = (EditText) vi[j].findViewById(R.id.txtTime);
fmin = minute;
if(hourOfDay <= 12) {
fhour = hourOfDay;
fmeridien = "AM";
} else {
fhour = hourOfDay-12;
fmeridien = "PM";
}
ftime =fhour + ":" + fmin + fmeridien;
et1.setText(ftime);
} else {
et2 = (EditText) vi[j].findViewById(R.id.txtTime2);
tmin = minute;
if(hourOfDay < 12) {
thour = hourOfDay;
tmeridien = "AM";
} else {
thour = hourOfDay-12;
tmeridien = "PM";
}
ttime = thour + ":" + tmin +tmeridien;
et2.setText(ttime);
}
}
public void Save(View v)
{
int position = (int) v.getTag();
if(position<j);
else {
et3 = (EditText) vi[j].findViewById(R.id.txtSet);
txt = et3.getText().toString();
Log.i("Position", "Value is " + position);
db.write1(j, ftime, ttime, txt);
Toast.makeText(this, "Successfully saved", Toast.LENGTH_LONG).show();
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
Calendar c = Calendar.getInstance();
c.setFirstDayOfWeek(Calendar.MONDAY);
int day = c.get(Calendar.DAY_OF_WEEK);
int value;
if(fmeridien=="AM") value=0;
else value=1;
c.set(Calendar.DAY_OF_WEEK,day);
c.set(Calendar.AM_PM, value);
c.set(Calendar.HOUR, fhour);
c.set(Calendar.MINUTE, fmin);
c.set(Calendar.SECOND,0);
Intent i = new Intent("com.example.annu.sheduler.DisplayNotification");
//---assign an ID of 1---
i.putExtra("NotifID", j);
i.putExtra("text",txt);
PendingIntent displayIntent = PendingIntent.getActivity(
getBaseContext(), j, i, 0);
j++;
//---sets the alarm to trigger---
alarmManager.set(AlarmManager.RTC_WAKEUP,
c.getTimeInMillis(), displayIntent);}
}
}
activity_monday.xml
<LinearLayout android:id="@+id/llm"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.annu.sheduler.Monday"
android:background="#ffffa751"
android:label="Monday">
<TextView
android:id="@+id/tvm"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="setTime"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="16dp"
android:text="Create a schedule"
android:textStyle="bold"
android:textSize="24sp"/>
</LinearLayout>
activity_timepicker.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="1">
<EditText
android:id="@+id/txtTime"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight=".30"
android:hint="From"
android:onClick="setTime2"/>
<EditText
android:id="@+id/txtTime2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight=".30"
android:hint="To"
android:onClick="setTime3"/>
<EditText
android:id="@+id/txtSet"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight=".40"
android:hint="Description!!!"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Save"
android:onClick="Save"
android:minHeight="0dp"
android:minWidth="20dp"/>
</LinearLayout>
TimeTableDbHelper.java
public class TimeTableDbHelper extends SQLiteOpenHelper {
public static final String TABLE_NAMEM = "timetableM";
public static final String COLUMN_NO1 = "c_no1";
public static final String COLUMN_FROM_TIME1 = "FTIME1";
public static final String COLUMN_TO_TIME1 = "TTIME1";
public static final String COLUMN_DESC1 = "Description1";
private static final int DATABASE_VERSION = 1;
static final String DATABASE_NAME = "TimeTable.db";
public TimeTableDbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
final String SQL_CREATE_TIME_TABLE1 = "CREATE TABLE " + TABLE_NAMEM + " (" +
COLUMN_NO1 + " INTEGER PRIMARY KEY, " +
COLUMN_FROM_TIME1 + " STRING NOT NULL," +
COLUMN_TO_TIME1 + " STRING NOT NULL," +
COLUMN_DESC1 + " TEXT NOT NULL" +
" );";
sqLiteDatabase.execSQL(SQL_CREATE_TIME_TABLE1);
}
@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int oldVersion, int newVersion) {
sqLiteDatabase.execSQL("DROP TABLE IF EXISTS " + TABLE_NAMEM);
onCreate(sqLiteDatabase);
}
public void write1(int column_no, String ftime, String ttime, String desc) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(COLUMN_NO1, column_no);
values.put(COLUMN_FROM_TIME1, ftime);
values.put(COLUMN_TO_TIME1, ttime);
values.put(COLUMN_DESC1, desc);
Boolean res = CheckIsDataAlreadyInDBorNot(TABLE_NAMEM, COLUMN_NO1, column_no);
if (res == false) db.insert(TABLE_NAMEM, null, values);
else db.update(TABLE_NAMEM, values, null, null);
db.close();
}
public int check(String tname) {
SQLiteDatabase db = this.getWritableDatabase();
String count = "SELECT count(*) FROM " + tname;
Cursor mcursor = db.rawQuery(count, null);
mcursor.moveToFirst();
int icount = mcursor.getInt(0);
return icount;
}
public String rd1(int c_no, int col) {
String selectQuery = "SELECT * FROM " + TABLE_NAMEM + " WHERE " + COLUMN_NO1 + " = " + c_no;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
String data = "";
if (cursor.moveToFirst()) {
// get the data into array,or class variable
do {
data = cursor.getString(col);
//Log.i("TimeTableDbHelper", "Value read " + cursor.getString(6));
} while (cursor.moveToNext());
}
db.close();
return data;
}
public boolean CheckIsDataAlreadyInDBorNot(String TableName,
String dbfield, int fieldValue) {
SQLiteDatabase db = this.getReadableDatabase();
String Query = "Select * from " + TableName + " where " + dbfield + " = " + fieldValue;
Cursor cursor = db.rawQuery(Query, null);
if (cursor.getCount() <= 0) {
cursor.close();
return false;
}
cursor.close();
return true;
}
}
答案 0 :(得分：0)
返回：
受影响的行数
所以你可以这样做：
if (db.update(TABLE_NAMEM, values, null, null) == 0)
db.insert(TABLE_NAMEM, null, values);
db.close();