我正在努力解决这个错误:
08-08 11:42:53.179:E / AndroidRuntime(20288):引起:java.lang.InstantiationException:无法实例化类com.example.localnotificationtest.ReminderService; 没有空的构造函数
我不明白为什么会出现这个错误。
我试图在特定的时间出现通知,并在搜索一段时间后,我发现这个旧的计算器问题。我尝试了一切,但我的代码给出了错误。
请帮我解决这个问题。
这是我的MainActivity代码:
public class MainActivity extends Activity {
int mHour, mMinute;
ReminderService reminderService;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
reminderService = new ReminderService("ReminderService");
TimePickerDialog dialog = new TimePickerDialog(this, mTimeSetListener, mHour, mMinute, false);
dialog.show();
}
TimePickerDialog.OnTimeSetListener mTimeSetListener = new OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker v, int hourOfDay, int minute) {
mHour = hourOfDay;
mMinute = minute;
AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
Calendar c = Calendar.getInstance();
c.set(Calendar.YEAR, Calendar.YEAR);
c.set(Calendar.MONTH, Calendar.MONTH);
c.set(Calendar.DAY_OF_MONTH, Calendar.DAY_OF_MONTH);
c.set(Calendar.HOUR_OF_DAY, mHour);
c.set(Calendar.MINUTE, mMinute);
c.set(Calendar.SECOND, 0);
long timeInMills = c.getTimeInMillis();
Intent intent = new Intent(MainActivity.this, ReminderService.class);
PendingIntent pendingIntent = PendingIntent.getService(MainActivity.this, 0, intent, 0);
alarmManager.set(AlarmManager.RTC, timeInMills, pendingIntent);
}
};
}
这是我的ReminderService代码:
public class ReminderService extends IntentService {
public ReminderService(String name) {
super(name);
// TODO Auto-generated constructor stub
}
@Override
protected void onHandleIntent(Intent intent) {
Intent notificationIntent = new Intent(this, MainActivity.class);
PendingIntent contentIntent = PendingIntent.getActivity(this, 1, notificationIntent, PendingIntent.FLAG_CANCEL_CURRENT);
NotificationManager nm = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
Notification.Builder builder = new Notification.Builder(this);
builder.setContentIntent(contentIntent)
.setSmallIcon(R.drawable.ic_launcher)
.setTicker("Local Notification Ticker")
.setWhen(System.currentTimeMillis())
.setAutoCancel(true)
.setContentTitle("Local Notification")
.setContentText("This is content text.");
Notification n = builder.getNotification();
nm.notify(1, n);
}
}
这里是我的manifest.xml:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.localnotificationtest"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="15" />
<application
android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" >
<activity android:name=".MainActivity" android:label="@string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name="ReminderService"></service>
</application>
</manifest>
我不知道我哪里错了。我是否缺少一些代码?
发布于 2018-04-20 15:50:49
你需要为你的类添加一个空的构造函数,即不带任何参数的构造函数:
public ReminderService() {
super("ReminderService");
}
从说明文件:
将name
被用来命名工作线程。
发布于 2018-04-20 16:45:33
如果你的服务声明为一个内部类/嵌套类,你还需要使这个类是静态的
没有这个,即使你的构造函数是正确的,你也会得到错误
https://stackoverflow.com/questions/-100003948
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