小编use*_*190的帖子

一周中的几天,我遇到了填充旋转器的问题.

layout xml:

<Spinner 
    android:id="@+id/week_spinner"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:drawSelectorOnTop="true"/>

strings.xml中

<resources>
  <string-array name="days_of_week">
    <item>Monday</item>
    <item>Tuesday</item>
    <item>Wednesday</item>
    <item>Thursday</item>
    <item>Friday</item>
  </string-array>
</resources>

Java的:

public class AddModule extends Activity {
    Spinner day;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        day = (Spinner)findViewById(R.id.week_spinner);

        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.days_of_week, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        day.setAdapter(adapter);
        setContentView(R.layout.activity_add_module);
    }
}

这是导致应用程序崩溃的setAdapter行.我收到以下错误

11-05 21:24:31.235: W/dalvikvm(867): threadid=1: thread exiting with uncaught exception (group=0x40a9a228) 
11-05 21:24:31.245: E/AndroidRuntime(867): FATAL EXCEPTION: main 
11-05 21:24:31.245: E/AndroidRuntime(867): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cathal.timetable/com.cathal.timetable.AddModule}: java.lang.NullPointerException 
11-05 21:24:31.245: E/AndroidRuntime(867):  at …

我想将我的应用程序发送到睡眠状态,然后在设定的时间将其唤醒.我让它睡觉但不醒来.

这设置了唤醒锁:

private void setWakeLock(){
    System.out.println("wakelock");
    PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
    wl = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK |
            PowerManager.ACQUIRE_CAUSES_WAKEUP
            | PowerManager.ON_AFTER_RELEASE, "DoNotDimScreen");
    wl.acquire();
}

这会为唤醒/睡眠时间设置警报:

private void setWakeSleep(){
    java.util.Calendar c = java.util.Calendar.getInstance();
    c.set(java.util.Calendar.HOUR_OF_DAY, 17);
    c.set(java.util.Calendar.MINUTE, 53);
    c.set(java.util.Calendar.MILLISECOND, 0);
    Intent sleepIntent = new Intent("SLEEP_INTENT");
    PendingIntent sleepPendingIntent = PendingIntent.getBroadcast(this, 0, sleepIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
    alarmManager.set(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), sleepPendingIntent);

    c.set(java.util.Calendar.HOUR_OF_DAY, 18);
    c.set(java.util.Calendar.MINUTE, 14);
    c.set(java.util.Calendar.MILLISECOND, 0);
    Intent wakeIntent = new Intent("WAKE_INTENT");
    PendingIntent wakePendingIntent = PendingIntent.getBroadcast(this, 0, wakeIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    AlarmManager alarmManager2 = (AlarmManager) getSystemService(ALARM_SERVICE);
    alarmManager2.set(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), wakePendingIntent); …