Question

为什么我的闹钟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

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.amadey.myapplication" >

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

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher1"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".Introduction"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".MainActivity"
        android:theme="@style/AppTheme" >
    </activity>
    <activity
        android:name=".MainActivity2"
        android:theme="@style/AppTheme" >
    </activity>

    <receiver
        android:name=".StartReceiver"
        android:enabled="true"
        android:exported="true" >
    </receiver>

    <service
        android:name=".MyService"
        android:enabled="true"
        android:exported="true" >
    </service>

    <receiver
        android:name=".MyReceiver"
        android:enabled="true"
        android:exported="true" >

    </receiver>

    <service
        android:name=".MyService2"
        android:enabled="true"
        android:exported="true" >
    </service>

    <receiver
        android:name=".MyReceiver2"
        android:enabled="true"
        android:exported="true" >
        <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED" />
    </intent-filter>
    </receiver>
</application>

</manifest>

谢谢。

Answer 1

因为在android中，如果您的设备被重新启动，清单文件中没有BOOT_COMPLETED权限的所有服务/接收器将不会重新启动。由于接收器和服务现在在重新启动后“死亡”，因此没有人可以监听您的“待处理意图”以进行警报，没有人发送新的待处理意图，而且在重新启动时，这些待处理意图也会被清除。简而言之，在清单中使用该权限并处理接收器中的restart-intent。

Answer 2

您需要做以下事情。

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？

如果您想从SD卡读取数据，则需要指定此权限。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

设备重启后设置警报

2 个答案: