小编Jul*_*edo的帖子

我有一个带有媒体播放器的流媒体音频（来自服务器）。当我关闭屏幕并且系统进入睡眠模式时它起作用，但几分钟后手机停止音乐。当手机连接到电源（USB 电缆）时，不会发生这种情况。因此，系统必须由于电源管理或内存管理而使应用程序崩溃。

服务等级：

public class MyService extends Service {\n\n    PowerManager powerManager;\n    PowerManager.WakeLock wakeLock;\n    WifiManager.WifiLock wifiLock;\n\n    private MediaPlayer mediaPlayer;\n    @Nullable\n    @Override\n    public IBinder onBind(Intent intent) {\n       return null;\n    }\n\n    @Override\n    public int onStartCommand(Intent intent, int flags, int startId) {\n\n        powerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);\n        wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "My Lock");\n        wifiLock = ((WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE)).createWifiLock(WifiManager.WIFI_MODE_FULL, "mylock");\n\n    wakeLock.acquire();\n    wifiLock.acquire();\n\n        mediaPlayer = new MediaPlayer();\n mediaPlayer.setWakeMode(getApplicationContext(), PowerManager.PARTIAL_WAKE_LOCK);\n\n        mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);\n\n        try {\n            mediaPlayer.setDataSource("http://mediacontrol.jargon.com.ar:8168/;");\n        } catch (IOException e) {\n            e.printStackTrace();\n        }\n\n\n        mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {\n            @Override\n            public void onPrepared(MediaPlayer …

如果我在表上定义 Clob 数据类型但未指定字节大小，那么大小是变量还是会与该数据类型的最大变量数一起保存？

 CREATE TABLE "NOTIFICATIONS" 
   (    "ID" NUMBER(19,0) NOT NULL ENABLE, 
    "RECIPIENTS" VARCHAR2(255 BYTE) DEFAULT 'both' NOT NULL ENABLE, 
    "AGE_FROM" NUMBER(10,0), 
    "AGE_TO" NUMBER(10,0), 
    "MESSAGE_TITLE" VARCHAR2(4000 BYTE) NOT NULL ENABLE, 
    "MESSAGE_BODY" CLOB, 
    "ATTACHMENT_TYPE" VARCHAR2(255 BYTE) DEFAULT 'none' NOT NULL ENABLE, 
    "NOTIFICATION_DATE_FROM" DATE NOT NULL ENABLE, 
    "NOTIFICATION_DATE_TO" DATE NOT NULL ENABLE, 
    "CREATED_AT" TIMESTAMP (6), 
    "UPDATED_AT" TIMESTAMP (6), 
    "DELETED_AT" TIMESTAMP (6), 
) ;

正如您所看到的，MESSAGE_BODY 是 clob 类型，但没有可变大小。您可能会发现有时会存储 25,000 字节的字符串，有时会存储 4,000 字节，甚至可能会存储 100,000 字节。