用int代替String，節省記憶體
阿新 • • 發佈：2018-12-31
僅作個人記錄
看到Android Activity.H用了一種巧妙的方法節省記憶體
public static final int LAUNCH_ACTIVITY = 100; public static final int PAUSE_ACTIVITY = 101; public static final int PAUSE_ACTIVITY_FINISHING= 102; public static final int STOP_ACTIVITY_SHOW = 103; public static final int STOP_ACTIVITY_HIDE典型的時間換空間，真的棒，這是從原始碼中學到的好技巧= 104; public static final int SHOW_WINDOW = 105; public static final int HIDE_WINDOW = 106; public static final int RESUME_ACTIVITY = 107; public static final int SEND_RESULT = 108; public static final int DESTROY_ACTIVITY = 109; public static final intBIND_APPLICATION = 110; public static final int EXIT_APPLICATION = 111; public static final int NEW_INTENT = 112; public static final int RECEIVER = 113; public static final int CREATE_SERVICE = 114; public static final int SERVICE_ARGS = 115; public static final int STOP_SERVICE = 116; public static final int CONFIGURATION_CHANGED = 118; public static final int CLEAN_UP_CONTEXT = 119; public static final int GC_WHEN_IDLE = 120; public static final int BIND_SERVICE = 121; public static final int UNBIND_SERVICE = 122; public static final int DUMP_SERVICE = 123; public static final int LOW_MEMORY = 124; public static final int ACTIVITY_CONFIGURATION_CHANGED = 125; public static final int RELAUNCH_ACTIVITY = 126; public static final int PROFILER_CONTROL = 127; public static final int CREATE_BACKUP_AGENT = 128; public static final int DESTROY_BACKUP_AGENT = 129; public static final int SUICIDE = 130; public static final int REMOVE_PROVIDER = 131; public static final int ENABLE_JIT = 132; public static final int DISPATCH_PACKAGE_BROADCAST = 133; public static final int SCHEDULE_CRASH = 134; public static final int DUMP_HEAP = 135; public static final int DUMP_ACTIVITY = 136; public static final int SLEEPING = 137; public static final int SET_CORE_SETTINGS = 138; public static final int UPDATE_PACKAGE_COMPATIBILITY_INFO = 139; public static final int TRIM_MEMORY = 140; public static final int DUMP_PROVIDER = 141; public static final int UNSTABLE_PROVIDER_DIED = 142; public static final int REQUEST_ASSIST_CONTEXT_EXTRAS = 143; public static final int TRANSLUCENT_CONVERSION_COMPLETE = 144; public static final int INSTALL_PROVIDER = 145; public static final int ON_NEW_ACTIVITY_OPTIONS = 146; public static final int CANCEL_VISIBLE_BEHIND = 147; public static final int BACKGROUND_VISIBLE_BEHIND_CHANGED = 148; public static final int ENTER_ANIMATION_COMPLETE = 149; public static final int START_BINDER_TRACKING = 150; public static final int STOP_BINDER_TRACKING_AND_DUMP = 151; public static final int MULTI_WINDOW_MODE_CHANGED = 152; public static final int PICTURE_IN_PICTURE_MODE_CHANGED = 153; public static final int LOCAL_VOICE_INTERACTION_STARTED = 154; public static final int ATTACH_AGENT = 155; public static final int APPLICATION_INFO_CHANGED = 156; public static final int ACTIVITY_MOVED_TO_DISPLAY = 157; String codeToString(int code) { if (DEBUG_MESSAGES) { switch (code) { case LAUNCH_ACTIVITY: return "LAUNCH_ACTIVITY"; case PAUSE_ACTIVITY: return "PAUSE_ACTIVITY"; case PAUSE_ACTIVITY_FINISHING: return "PAUSE_ACTIVITY_FINISHING"; case STOP_ACTIVITY_SHOW: return "STOP_ACTIVITY_SHOW"; case STOP_ACTIVITY_HIDE: return "STOP_ACTIVITY_HIDE"; case SHOW_WINDOW: return "SHOW_WINDOW"; case HIDE_WINDOW: return "HIDE_WINDOW"; case RESUME_ACTIVITY: return "RESUME_ACTIVITY"; case SEND_RESULT: return "SEND_RESULT"; case DESTROY_ACTIVITY: return "DESTROY_ACTIVITY"; case BIND_APPLICATION: return "BIND_APPLICATION"; case EXIT_APPLICATION: return "EXIT_APPLICATION"; case NEW_INTENT: return "NEW_INTENT"; case RECEIVER: return "RECEIVER"; case CREATE_SERVICE: return "CREATE_SERVICE"; case SERVICE_ARGS: return "SERVICE_ARGS"; case STOP_SERVICE: return "STOP_SERVICE"; case CONFIGURATION_CHANGED: return "CONFIGURATION_CHANGED"; case CLEAN_UP_CONTEXT: return "CLEAN_UP_CONTEXT"; case GC_WHEN_IDLE: return "GC_WHEN_IDLE"; case BIND_SERVICE: return "BIND_SERVICE"; case UNBIND_SERVICE: return "UNBIND_SERVICE"; case DUMP_SERVICE: return "DUMP_SERVICE"; case LOW_MEMORY: return "LOW_MEMORY"; case ACTIVITY_CONFIGURATION_CHANGED: return "ACTIVITY_CONFIGURATION_CHANGED"; case ACTIVITY_MOVED_TO_DISPLAY: return "ACTIVITY_MOVED_TO_DISPLAY"; case RELAUNCH_ACTIVITY: return "RELAUNCH_ACTIVITY"; case PROFILER_CONTROL: return "PROFILER_CONTROL"; case CREATE_BACKUP_AGENT: return "CREATE_BACKUP_AGENT"; case DESTROY_BACKUP_AGENT: return "DESTROY_BACKUP_AGENT"; case SUICIDE: return "SUICIDE"; case REMOVE_PROVIDER: return "REMOVE_PROVIDER"; case ENABLE_JIT: return "ENABLE_JIT"; case DISPATCH_PACKAGE_BROADCAST: return "DISPATCH_PACKAGE_BROADCAST"; case SCHEDULE_CRASH: return "SCHEDULE_CRASH"; case DUMP_HEAP: return "DUMP_HEAP"; case DUMP_ACTIVITY: return "DUMP_ACTIVITY"; case SLEEPING: return "SLEEPING"; case SET_CORE_SETTINGS: return "SET_CORE_SETTINGS"; case UPDATE_PACKAGE_COMPATIBILITY_INFO: return "UPDATE_PACKAGE_COMPATIBILITY_INFO"; case TRIM_MEMORY: return "TRIM_MEMORY"; case DUMP_PROVIDER: return "DUMP_PROVIDER"; case UNSTABLE_PROVIDER_DIED: return "UNSTABLE_PROVIDER_DIED"; case REQUEST_ASSIST_CONTEXT_EXTRAS: return "REQUEST_ASSIST_CONTEXT_EXTRAS"; case TRANSLUCENT_CONVERSION_COMPLETE: return "TRANSLUCENT_CONVERSION_COMPLETE"; case INSTALL_PROVIDER: return "INSTALL_PROVIDER"; case ON_NEW_ACTIVITY_OPTIONS: return "ON_NEW_ACTIVITY_OPTIONS"; case CANCEL_VISIBLE_BEHIND: return "CANCEL_VISIBLE_BEHIND"; case BACKGROUND_VISIBLE_BEHIND_CHANGED: return "BACKGROUND_VISIBLE_BEHIND_CHANGED"; case ENTER_ANIMATION_COMPLETE: return "ENTER_ANIMATION_COMPLETE"; case MULTI_WINDOW_MODE_CHANGED: return "MULTI_WINDOW_MODE_CHANGED"; case PICTURE_IN_PICTURE_MODE_CHANGED: return "PICTURE_IN_PICTURE_MODE_CHANGED"; case LOCAL_VOICE_INTERACTION_STARTED: return "LOCAL_VOICE_INTERACTION_STARTED"; case ATTACH_AGENT: return "ATTACH_AGENT"; case APPLICATION_INFO_CHANGED: return "APPLICATION_INFO_CHANGED"; } } return Integer.toString(code); }