Android之不能静态注册的系统广播（5个）

在Android开发中，有些系统广播是不能在清单文件中静态注册的，只能通过registerReceiver方法进行动态注册（Android文档这样描述：You cannot receive this through components declared in manifests, only by explicitly registering for it with {@link Context#registerReceiver(BroadcastReceiver, IntentFilter) Context.registerReceiver()}.）

下面是几个常见的只能动态注册的广播：

1、当设备没有进行交互，屏幕关闭发送的广播：

public static final String ACTION_SCREEN_OFF = "android.intent.action.SCREEN_OFF";

Android官方文档如下定义：

    /**     * Broadcast Action: Sent when the device goes to sleep and becomes non-interactive.     * <p>     * For historical reasons, the name of this broadcast action refers to the power     * state of the screen but it is actually sent in response to changes in the     * overall interactive state of the device.     * </p><p>     * This broadcast is sent when the device becomes non-interactive which may have     * nothing to do with the screen turning off.  To determine the     * actual state of the screen, use {@link android.view.Display#getState}.     * </p><p>     * See {@link android.os.PowerManager#isInteractive} for details.     * </p>     * You <em>cannot</em> receive this through components declared in     * manifests, only by explicitly registering for it with     * {@link Context#registerReceiver(BroadcastReceiver, IntentFilter)     * Context.registerReceiver()}.     *     * <p class="note">This is a protected intent that can only be sent     * by the system.     */    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)    public static final String ACTION_SCREEN_OFF = "android.intent.action.SCREEN_OFF";

2、当设备进行互动但屏幕打开可能什么也没做发送的广播：

public static final String ACTION_SCREEN_ON = "android.intent.action.SCREEN_ON";

Android官方文档如下定义：

    /**     * Broadcast Action: Sent when the device wakes up and becomes interactive.     * <p>     * For historical reasons, the name of this broadcast action refers to the power     * state of the screen but it is actually sent in response to changes in the     * overall interactive state of the device.     * </p><p>     * This broadcast is sent when the device becomes interactive which may have     * nothing to do with the screen turning on.  To determine the     * actual state of the screen, use {@link android.view.Display#getState}.     * </p><p>     * See {@link android.os.PowerManager#isInteractive} for details.     * </p>     * You <em>cannot</em> receive this through components declared in     * manifests, only by explicitly registering for it with     * {@link Context#registerReceiver(BroadcastReceiver, IntentFilter)     * Context.registerReceiver()}.     *     * <p class="note">This is a protected intent that can only be sent     * by the system.     */    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)    public static final String ACTION_SCREEN_ON = "android.intent.action.SCREEN_ON";

3、当前时间已经改变，每分钟发送一次的广播：

public static final String ACTION_TIME_TICK = "android.intent.action.TIME_TICK";

Android官方文档如下定义：

    /**     * Broadcast Action: The current time has changed.  Sent every     * minute.  You <em>cannot</em> receive this through components declared     * in manifests, only by explicitly registering for it with     * {@link Context#registerReceiver(BroadcastReceiver, IntentFilter)     * Context.registerReceiver()}.     *     * <p class="note">This is a protected intent that can only be sent     * by the system.     */    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)    public static final String ACTION_TIME_TICK = "android.intent.action.TIME_TICK";

4、当前设备方向，区域设置等发生了变化。用户界面（视图层次）根据新的信息重建时发送的广播：

public static final String ACTION_TIME_TICK = "android.intent.action.TIME_TICK";

Android官方文档如下定义：

    /**     * Broadcast Action: The current device {@link android.content.res.Configuration}     * (orientation, locale, etc) has changed.  When such a change happens, the     * UIs (view hierarchy) will need to be rebuilt based on this new     * information; for the most part, applications don't need to worry about     * this, because the system will take care of stopping and restarting the     * application to make sure it sees the new changes.  Some system code that     * can not be restarted will need to watch for this action and handle it     * appropriately.     *     * <p class="note">     * You <em>cannot</em> receive this through components declared     * in manifests, only by explicitly registering for it with     * {@link Context#registerReceiver(BroadcastReceiver, IntentFilter)     * Context.registerReceiver()}.     *     * <p class="note">This is a protected intent that can only be sent     * by the system.     *     * @see android.content.res.Configuration     */    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)    public static final String ACTION_CONFIGURATION_CHANGED = "android.intent.action.CONFIGURATION_CHANGED";

5、当电池电量发生改变是发送的广播：

 public static final String ACTION_BATTERY_CHANGED = "android.intent.action.BATTERY_CHANGED";

Android官方文档如下定义：

    /**     * Broadcast Action:  This is a <em>sticky broadcast</em> containing the     * charging state, level, and other information about the battery.     * See {@link android.os.BatteryManager} for documentation on the     * contents of the Intent.     *     * <p class="note">     * You <em>cannot</em> receive this through components declared     * in manifests, only by explicitly registering for it with     * {@link Context#registerReceiver(BroadcastReceiver, IntentFilter)     * Context.registerReceiver()}.  See {@link #ACTION_BATTERY_LOW},     * {@link #ACTION_BATTERY_OKAY}, {@link #ACTION_POWER_CONNECTED},     * and {@link #ACTION_POWER_DISCONNECTED} for distinct battery-related     * broadcasts that are sent and can be received through manifest     * receivers.     *     * <p class="note">This is a protected intent that can only be sent     * by the system.     */    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)    public static final String ACTION_BATTERY_CHANGED = "android.intent.action.BATTERY_CHANGED";