我想制作闹钟应用。我遇到了一个问题：重新启动设备后，我没有得到任何警报。然后我问到如何解决这个问题，答案是：我应该创建一个数据库，并将所有警报保存在那里，并在重新启动比较警报之后。如果当前时间少于当前时间，则报警＆＃39;我应该设置一个新的闹钟。好吧，我做了这个并且出错了。请帮我解决。
java.lang.ArrayIndexOutOfBoundsException: length=2; index=2
at com.example.amadey.myapplication.MainActivity2$1.onClick(MainActivity2.java:52)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
输入闹钟：
AlarmsDataSource datasource = new AlarmsDataSource(this);
datasource.open();
Alarms alarm = null;
Long[] alarms = new Long[] { rt,calendar1.getTimeInMillis() };
alarm = datasource.createComment(alarms[1]);
alarm = datasource.createComment(alarms[2]);
Alarms.class：
public class Alarms {
private long id;
private String alarms;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getAlarms() {
return alarms;
}
public void setAlarms(String alarms) {
this.alarms = alarms;
}
}
AlarmsDataSource.class
public class AlarmsDataSource {
private SQLiteDatabase database;
private MySQLiteHelper dbHelper;
private String[] allColumns = { MySQLiteHelper.COLUMN_ID,
MySQLiteHelper.COLUMN_ALARM };
public AlarmsDataSource(Context context) {
dbHelper = new MySQLiteHelper(context);
}
public void open() throws SQLException {
database = dbHelper.getWritableDatabase();
}
public void close() {
dbHelper.close();
}
public Alarms createComment(Long alarm) {
ContentValues values = new ContentValues();
values.put(MySQLiteHelper.COLUMN_ALARM, alarm);
long insertId = database.insert(MySQLiteHelper.TABLE_ALARMS, null,
values);
Cursor cursor = database.query(MySQLiteHelper.TABLE_ALARMS,
allColumns, MySQLiteHelper.COLUMN_ID + " = " + insertId, null,
null, null, null);
cursor.moveToFirst();
Alarms newAlarms = cursorToAlarm(cursor);
cursor.close();
return newAlarms;
}
/*public List<Comment> getAllComments() {
List<Comment> comments = new ArrayList<Comment>();
Cursor cursor = database.query(MySQLiteHelper.TABLE_COMMENTS,
allColumns, null, null, null, null, null);
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
Comment comment = cursorToComment(cursor);
comments.add(comment);
cursor.moveToNext();
}
// make sure to close the cursor
cursor.close();
return comments;
}*/
private Alarms cursorToAlarm(Cursor cursor) {
Alarms alarms = new Alarms();
alarms.setId(cursor.getLong(0));
return alarms;
}
}
MySQLiteHelper.class：
public class MySQLiteHelper extends SQLiteOpenHelper {
public static final String TABLE_ALARMS = "alarms";
public static final String COLUMN_ID = "_id";
public static final String COLUMN_ALARM = "alarm";
private static final String DB_PATH = "/DATA/data/db1/databases/";
private static final String DATABASE_NAME = "alarms.db";
private static final int DATABASE_VERSION = 1;
// Database creation sql statement
private static final String DATABASE_CREATE = "create table "
+ TABLE_ALARMS + "(" + COLUMN_ID
+ " integer primary key autoincrement, " + COLUMN_ALARM
+ " text not null);";
public MySQLiteHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase database) {
database.execSQL(DATABASE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public void openDataBase() throws SQLException {
//Open the database
String myPath = DB_PATH + DATABASE_NAME;
SQLiteDatabase myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}
}
这是我检索警报的方式：
public class MyReceiver extends BroadcastReceiver {
MySQLiteHelper mySQLiteHelper;
public String COLUMN_ID = MySQLiteHelper.COLUMN_ID;
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(Intent.ACTION_BOOT_COMPLETED)){
//context.startService(new Intent(context, MyService.class));
mySQLiteHelper = new MySQLiteHelper(context);
mySQLiteHelper.openDataBase();
getData(context); //this is the method to query
mySQLiteHelper.close();
}
}
public void getData(Context context) {
final String TABLE_NAME = MySQLiteHelper.TABLE_ALARMS;
String selectQuery = "SELECT * FROM " + TABLE_NAME;
SQLiteDatabase db = mySQLiteHelper.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, new String[]{COLUMN_ID});
Long[] data = null;
Intent intent = new Intent(context,MyReceiver1.class);
Intent intent1 = new Intent(context,MyReceiver2.class);
PendingIntent pi = PendingIntent.getBroadcast(context,0,intent,0);
PendingIntent pi1 = PendingIntent.getBroadcast(context,0,intent1,0);
if (cursor.moveToFirst()) {
do {
int keyRowIdColumnIndex = cursor.getColumnIndex(COLUMN_ID);
data[keyRowIdColumnIndex] = cursor.getLong(keyRowIdColumnIndex);
}while (cursor.moveToNext());
}
AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
if (data[1]>System.currentTimeMillis()){
am.set(AlarmManager.RTC,data[1],pi);
am.set(AlarmManager.RTC,data[2],pi1);
}else if(data[2]>System.currentTimeMillis() && data[1]<System.currentTimeMillis()){
am.set(AlarmManager.RTC,data[2],pi1);
context.startService(new Intent(context, MyService2.class));
}
cursor.close();
}
}
帮助我，请求!!!!!!!!!
答案 0 :(得分：0)
尝试：
alarm = datasource.createComment(alarms[0]);
alarm = datasource.createComment(alarms[1]);
见这里：https://www.cs.umd.edu/~clin/MoreJava/Container/arr-length.html