android 监听状态栏被下拉

要监听Android设备的状态栏是否被下拉，可以使用以下代码：

public class MyBroadcastReceiver extends BroadcastReceiver {

    private static final String SYSTEM_DIALOG_REASON_KEY = "reason";
    private static final String SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS = "globalactions";
    private static final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";
    private static final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";

    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (action != null && action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
            String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);
            if (reason != null) {
                if (reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) {
                    // Home键被按下
                } else if (reason.equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) {
                    // 最近任务键被按下
                } else if (reason.equals(SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS)) {
                    // 电源键菜单被按下
                } else if (reason.equals("statusbar")) {
                    // 状态栏被下拉
                }
            }
        }
    }
}

在AndroidManifest.xml文件中注册广播接收器：

<receiver android:name=".MyBroadcastReceiver">
    <intent-filter>
        <action android:name="android.intent.action.CLOSE_SYSTEM_DIALOGS" />
    </intent-filter>
</receiver>

这样就能监听到状态栏是否被下拉了。