/**
 * Uses Root access to enable and disable SystemUI.
 * @param enabled Decide whether to enable or disable.
 */
public void setSystemUIEnabled(boolean enabled){
    try {
        Process p = Runtime.getRuntime().exec("su");
        DataOutputStream os = new DataOutputStream(p.getOutputStream());
        os.writeBytes("pm " + (enabled ? "enable" : "disable") 
                + " com.android.systemui\n");
        os.writeBytes("exit\n");
        os.flush();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

工作正常.用法:

setSystemUIEnabled(true);  // Enable SystemUI
setSystemUIEnabled(false); // Disable SystemUI