设备重启后设置警报(Set alarms after device was restarted)

为什么我的警报在设备重启后没有响铃？我将警报的时间插入SQLite数据库并在设备重启后再次设置警报，但这似乎不起作用。我可以做些什么来让我的闹钟响铃？ mySQLiteHelper.class：

public class mySQLiteHelper extends SQLiteOpenHelper { // All Static variables // Database Version public static final int DATABASE_VERSION = 2; // Database Name private static final String DATABASE_NAME = "alarms.db"; // Contacts table name private static final String TABLE_ALARMS = "alarms"; // Contacts Table Columns names private static final String KEY_ID = "id"; private static final String KEY_ALARM = "alarm"; private static final String KEY_NAME = "name"; public mySQLiteHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); } // Creating Tables"create table alarms (" //+ "id integer primary key," // + "alarm text," // + "name text," // added a ',' // + "alarmname text" + ");" @Override public void onCreate(SQLiteDatabase db) { String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_ALARMS + "(" + KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_ALARM + " TEXT, " + KEY_NAME + " TEXT" + ")"; //String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_ALARMS + "(" // + KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_ALARM + " TEXT, " // + KEY_NAME + " TEXT, UNIQUE ("+KEY_NAME+") ON CONFLICT REPLACE" + ")"; db.execSQL(CREATE_CONTACTS_TABLE); } // Upgrading database @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { // Drop older table if existed db.execSQL("DROP TABLE IF EXISTS " + TABLE_ALARMS); // Create tables again onCreate(db); } /** * All CRUD(Create, Read, Update, Delete) Operations"," + alarm.getName() +,name */ // Adding new contact void addAlarm(Alarm alarm) { SQLiteDatabase db = this.getWritableDatabase(); String sql = "INSERT or replace " + "INTO alarms (alarm,"+KEY_NAME+") " + "VALUES("+ alarm.getAlarm() + ",'" + alarm.getName() + "')"; //String sql = // "INSERT or replace INTO alarms (alarm,alarmname) VALUES("+ alarm.getAlarm() + ",'" + alarm.getName() + "')" ; db.execSQL(sql); db.close(); // Closing database connection } // Getting single contact String getAlarm(String alarmname) { String query = "Select * FROM " + TABLE_ALARMS + " WHERE " + KEY_NAME + " = \"" + alarmname + "\""; SQLiteDatabase db = this.getReadableDatabase(); Cursor cursor = db.rawQuery(query, null); if (cursor.getCount()>0) cursor.moveToFirst(); String alarm = cursor.getString(cursor.getColumnIndex(KEY_ALARM)); cursor.close(); // return contact return alarm; } // Deleting single contact public void deleteAlarm() { SQLiteDatabase db = this.getWritableDatabase(); //db.delete(TABLE_ALARMS, KEY_ID + " = ?",Alarm alarm // new String[] { String.valueOf(alarm.getID()) }); db.execSQL("delete from " + TABLE_ALARMS); db.close(); } // Getting contacts Count public int getAlarmsCount() { String countQuery = "SELECT * FROM " + TABLE_ALARMS; SQLiteDatabase db = this.getReadableDatabase(); Cursor cursor = db.rawQuery(countQuery, null); int i = cursor.getCount(); cursor.close(); // return count return i; } }

和Alarm.class：

public class Alarm { //private variables int _id; String _name; String _alarm; // Empty constructor public Alarm(String alarm,String alarmname){ this._alarm = alarm; this._name = alarmname; } // constructor public Alarm(int id, String name, String alarm){ this._id = id; this._name = name; this._alarm = alarm; } // constructor public Alarm(String alarm){ this._alarm = alarm; } // getting ID public int getID(){ return this._id; } // getting name public String getName(){ return this._name; } // getting phone number public String getAlarm(){ return this._alarm; } }

这就是我调用addAlarm（）的方法：

Calendar calendar1 = Calendar.getInstance(); calendar1.set(Calendar.MINUTE, timePicker1.getCurrentMinute()); calendar1.set(Calendar.HOUR_OF_DAY,timePicker1.getCurrentHour()); String alarm1 = Long.toString(calendar1.getTimeInMillis()); mySQLiteHelper mySQLiteHelper = new mySQLiteHelper(MainActivity2.this); mySQLiteHelper.deleteAlarm(); mySQLiteHelper.addAlarm(new Alarm(alarm1,"alarm1"));

和MyReceiver2.class：

public class MyReceiver2 extends BroadcastReceiver { public MyReceiver2() { } @Override public void onReceive(Context context, Intent intent) { if (intent.getAction().equals(Intent.ACTION_BOOT_COMPLETED)){ //context.startService(new Intent(context, MyService.class)); AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE); Intent intent1 = new Intent(context,StartReceiver.class); PendingIntent pi = PendingIntent.getBroadcast(context,0,intent1,0); mySQLiteHelper mySQLiteHelper = new mySQLiteHelper(context); String alarm1 = mySQLiteHelper.getAlarm("alarm1"); long alarm2 = Long.parseLong(alarm1); am.set(AlarmManager.RTC,alarm3,pi); } } }

还有我的AndroidManifest

谢谢。

why my alarms don't ring after device was restarted? I insert my alarms' times into SQLite database and set alarms again after device was restarted but this doesn't seem to be worked. What can I do to make my alarms ring at a time? mySQLiteHelper.class:

public class mySQLiteHelper extends SQLiteOpenHelper { // All Static variables // Database Version public static final int DATABASE_VERSION = 2; // Database Name private static final String DATABASE_NAME = "alarms.db"; // Contacts table name private static final String TABLE_ALARMS = "alarms"; // Contacts Table Columns names private static final String KEY_ID = "id"; private static final String KEY_ALARM = "alarm"; private static final String KEY_NAME = "name"; public mySQLiteHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); } // Creating Tables"create table alarms (" //+ "id integer primary key," // + "alarm text," // + "name text," // added a ',' // + "alarmname text" + ");" @Override public void onCreate(SQLiteDatabase db) { String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_ALARMS + "(" + KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_ALARM + " TEXT, " + KEY_NAME + " TEXT" + ")"; //String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_ALARMS + "(" // + KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_ALARM + " TEXT, " // + KEY_NAME + " TEXT, UNIQUE ("+KEY_NAME+") ON CONFLICT REPLACE" + ")"; db.execSQL(CREATE_CONTACTS_TABLE); } // Upgrading database @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { // Drop older table if existed db.execSQL("DROP TABLE IF EXISTS " + TABLE_ALARMS); // Create tables again onCreate(db); } /** * All CRUD(Create, Read, Update, Delete) Operations"," + alarm.getName() +,name */ // Adding new contact void addAlarm(Alarm alarm) { SQLiteDatabase db = this.getWritableDatabase(); String sql = "INSERT or replace " + "INTO alarms (alarm,"+KEY_NAME+") " + "VALUES("+ alarm.getAlarm() + ",'" + alarm.getName() + "')"; //String sql = // "INSERT or replace INTO alarms (alarm,alarmname) VALUES("+ alarm.getAlarm() + ",'" + alarm.getName() + "')" ; db.execSQL(sql); db.close(); // Closing database connection } // Getting single contact String getAlarm(String alarmname) { String query = "Select * FROM " + TABLE_ALARMS + " WHERE " + KEY_NAME + " = \"" + alarmname + "\""; SQLiteDatabase db = this.getReadableDatabase(); Cursor cursor = db.rawQuery(query, null); if (cursor.getCount()>0) cursor.moveToFirst(); String alarm = cursor.getString(cursor.getColumnIndex(KEY_ALARM)); cursor.close(); // return contact return alarm; } // Deleting single contact public void deleteAlarm() { SQLiteDatabase db = this.getWritableDatabase(); //db.delete(TABLE_ALARMS, KEY_ID + " = ?",Alarm alarm // new String[] { String.valueOf(alarm.getID()) }); db.execSQL("delete from " + TABLE_ALARMS); db.close(); } // Getting contacts Count public int getAlarmsCount() { String countQuery = "SELECT * FROM " + TABLE_ALARMS; SQLiteDatabase db = this.getReadableDatabase(); Cursor cursor = db.rawQuery(countQuery, null); int i = cursor.getCount(); cursor.close(); // return count return i; } }

And Alarm.class:

public class Alarm { //private variables int _id; String _name; String _alarm; // Empty constructor public Alarm(String alarm,String alarmname){ this._alarm = alarm; this._name = alarmname; } // constructor public Alarm(int id, String name, String alarm){ this._id = id; this._name = name; this._alarm = alarm; } // constructor public Alarm(String alarm){ this._alarm = alarm; } // getting ID public int getID(){ return this._id; } // getting name public String getName(){ return this._name; } // getting phone number public String getAlarm(){ return this._alarm; } }

This is how I call addAlarm():

Calendar calendar1 = Calendar.getInstance(); calendar1.set(Calendar.MINUTE, timePicker1.getCurrentMinute()); calendar1.set(Calendar.HOUR_OF_DAY,timePicker1.getCurrentHour()); String alarm1 = Long.toString(calendar1.getTimeInMillis()); mySQLiteHelper mySQLiteHelper = new mySQLiteHelper(MainActivity2.this); mySQLiteHelper.deleteAlarm(); mySQLiteHelper.addAlarm(new Alarm(alarm1,"alarm1"));

And MyReceiver2.class:

public class MyReceiver2 extends BroadcastReceiver { public MyReceiver2() { } @Override public void onReceive(Context context, Intent intent) { if (intent.getAction().equals(Intent.ACTION_BOOT_COMPLETED)){ //context.startService(new Intent(context, MyService.class)); AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE); Intent intent1 = new Intent(context,StartReceiver.class); PendingIntent pi = PendingIntent.getBroadcast(context,0,intent1,0); mySQLiteHelper mySQLiteHelper = new mySQLiteHelper(context); String alarm1 = mySQLiteHelper.getAlarm("alarm1"); long alarm2 = Long.parseLong(alarm1); am.set(AlarmManager.RTC,alarm3,pi); } } }

And also my AndroidManifest

Thank you.

最满意答案

你需要做以下事情。

添加以下权限。

<uses-permission android:name="android.permission.READ_PHONE_STATE" />

从接收器中删除构造函数。

但如果我将存储在SD卡上，我应该添加READ_EXTERNAL_STORAGE权限吗？

如果你想从SD卡读取数据，那么你需要指定这个权限。如果你只想在SD卡上写数据那么就没有必要了。在这种情况下，您需要WRITE_EXTERNAL_STORAGE权限

You need to do the following things.

add the folloing permission.

<uses-permission android:name="android.permission.READ_PHONE_STATE" />

remove the constructor from receiver.

But if my will be stored on the sd card I should add READ_EXTERNAL_STORAGE permission?

if you want to read data from sd-card then you need to specifiy this permission. if you only want to write data on sd-card then there is no need for that. in that case you need WRITE_EXTERNAL_STORAGE permission

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