让按钮在每小时开始时可见？答案

【问题标题】：Make button visible at the start of every hour?让按钮在每小时开始时可见？
【发布时间】：2017-02-22 12:27:56
【问题描述】：

我的主要活动有一个按钮，可以打开一个表单活动，您可以在其中提交数据。提交数据后，按钮将消失。如何让它出现在一天中每个小时的开始？

例如，如果我在晚上 7:05 提交数据，则该按钮会一直消失到晚上 8:00。当我再次按下按钮提交数据时，按钮会消失，直到晚上 9:00，以此类推。

【问题讨论】：

试试 jobScheduler 或 AlarmManager

标签： java android android-studio

【解决方案1】：

当您提交数据时获取当前时间戳并将其存储在 sharedPref 中。当您开始活动时检查 sharedPref 并将其与设备的当前时间进行比较。

【讨论】：

【解决方案2】：

尝试使用后台服务并将通知间隔设置为 1 小时和单击按钮时启动服务，然后再启动该后台服务

BackgroundService.java

public class BackgroundService extends Service {

public static final int notify = 100000;  //interval between two services(Here Service run every 1 Minute)

private Timer mTimer = null;    //timer handling

Context context;

ScheduledExecutorService scheduleTaskExecutor;

View view;

Handler mHandler = new Handler();

/** indicates how to behave if the service is killed */
int mStartMode;

/** interface for clients that bind */
IBinder mBinder;

/** indicates whether onRebind should be used */
boolean mAllowRebind;

/** Called when the service is being created. */
@Override
public void onCreate() {
    super.onCreate();
    context = getApplicationContext();

    Toast.makeText(this, "Service is created", Toast.LENGTH_SHORT).show();

    if (mTimer != null) // Cancel if already existed
        mTimer.cancel();
    else
        mTimer = new Timer();   //recreate new
    mTimer.scheduleAtFixedRate(new TimeDisplay(), 0, notify);   //Schedule task
}

/** The service is starting, due to a call to startService() */
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    return super.onStartCommand(intent, flags, startId);

}

@Override
public IBinder onBind(Intent intent){
    return null;
}

/** Called when all clients have unbound with unbindService() */
@Override
public boolean onUnbind(Intent intent) {
    return mAllowRebind;
}

/** Called when a client is binding to the service with bindService()*/
@Override
public void onRebind(Intent intent) {

}

/** Called when The service is no longer used and is being destroyed */
@Override
public void onDestroy() {
    super.onDestroy();
    mTimer.cancel();    //For Cancel Timer
  Toast.makeText(this, "Service Destroyed", Toast.LENGTH_LONG).show();
}

//class TimeDisplay for handling task
class TimeDisplay extends TimerTask {
    @Override
    public void run() {
        // run on another thread
        mHandler.post(new Runnable() {
            @Override
            public void run() {
        // Toast.makeText(this, "Service Start",Toast.LENGTH_LONG).show();
            }
        });
    }
}

}

AndroidManifest.xml
<service android:name=".BackgroundService.KametSportsEventsService" android:enabled="true" />

//启动后台服务

startService(new Intent(getBaseContext(), BackgroundService.class));

//停止后台服务

stopService(new Intent(getBaseContext(), BackgroundService.class));

【讨论】：