intent setFlags错误

Question

出了什么问题，确实标记为红色？

这是我的意图

public void onBackPressed() {
    super.onBackPressed();
    Intent i = new Intent(this, MainActivity.class);
    i.setFlags(268468224);
    startActivity(i);
    finish();
    finishAffinity();
    System.exit(0);
 }}

i.setFlags（268468224）标记为红色，任何解决方案？

Answer 1

Android Intent setFlags（）有@Retention（RetentionPolicy.SOURCE）注释。这就是为什么你的行i.setFlags（268468224）;标记为红色，因为违反了规则。

  /**
     * Set special flags controlling how this intent is handled.  Most values
     * here depend on the type of component being executed by the Intent,
     * specifically the FLAG_ACTIVITY_* flags are all for use with
     * {@link Context#startActivity Context.startActivity()} and the
     * FLAG_RECEIVER_* flags are all for use with
     * {@link Context#sendBroadcast(Intent) Context.sendBroadcast()}.
     *
     * <p>See the
     * <a href="{@docRoot}guide/topics/fundamentals/tasks-and-back-stack.html">Tasks and Back
     * Stack</a> documentation for important information on how some of these options impact
     * the behavior of your application.
     *
     * @param flags The desired flags.
     * @return Returns the same Intent object, for chaining multiple calls
     * into a single statement.
     * @see #getFlags
     * @see #addFlags
     * @see #removeFlags
     */
    public @NonNull Intent setFlags(@Flags int flags) {
        mFlags = flags;
        return this;
    }

 @Retention(RetentionPolicy.SOURCE)
    public @interface Flags {}

    /** @hide */
    @IntDef(flag = true, prefix = { "FLAG_" }, value = {
            FLAG_FROM_BACKGROUND,
            FLAG_DEBUG_LOG_RESOLUTION,
            FLAG_EXCLUDE_STOPPED_PACKAGES,
            FLAG_INCLUDE_STOPPED_PACKAGES,
            FLAG_DEBUG_TRIAGED_MISSING,
            FLAG_IGNORE_EPHEMERAL,
            FLAG_ACTIVITY_NO_HISTORY,
            FLAG_ACTIVITY_SINGLE_TOP,
            FLAG_ACTIVITY_NEW_TASK,
            FLAG_ACTIVITY_MULTIPLE_TASK,
            FLAG_ACTIVITY_CLEAR_TOP,
            FLAG_ACTIVITY_FORWARD_RESULT,
            FLAG_ACTIVITY_PREVIOUS_IS_TOP,
            FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS,
            FLAG_ACTIVITY_BROUGHT_TO_FRONT,
            FLAG_ACTIVITY_RESET_TASK_IF_NEEDED,
            FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY,
            FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET,
            FLAG_ACTIVITY_NEW_DOCUMENT,
            FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET,
            FLAG_ACTIVITY_NO_USER_ACTION,
            FLAG_ACTIVITY_REORDER_TO_FRONT,
            FLAG_ACTIVITY_NO_ANIMATION,
            FLAG_ACTIVITY_CLEAR_TASK,
            FLAG_ACTIVITY_TASK_ON_HOME,
            FLAG_ACTIVITY_RETAIN_IN_RECENTS,
            FLAG_ACTIVITY_LAUNCH_ADJACENT,
            FLAG_RECEIVER_REGISTERED_ONLY,
            FLAG_RECEIVER_REPLACE_PENDING,
            FLAG_RECEIVER_FOREGROUND,
            FLAG_RECEIVER_NO_ABORT,
            FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT,
            FLAG_RECEIVER_BOOT_UPGRADE,
            FLAG_RECEIVER_INCLUDE_BACKGROUND,
            FLAG_RECEIVER_EXCLUDE_BACKGROUND,
            FLAG_RECEIVER_FROM_SHELL,
            FLAG_RECEIVER_VISIBLE_TO_INSTANT_APPS,
    })

Answer 2

只有这对夫妇才能给我们带来结果：

Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_CLEAR_TASK

0x10008000 （即268468224）