更改ActionBar隐藏动画？

Question

默认情况下,在Android 3.0+中,当调用ActionBar.hide()/ show()时,条形图会以简短的淡入/淡出动画进行动画处理.

此列表中似乎没有与动画资源关联的XML样式属性.

有没有办法改变这个动画？在我的情况下,我只是想改变动画时间,但是也可以有滑动动画吗？

Answer 1

没有.

至少不在3.0,3.1或3.2中.如果您查看反编译的源代码,com.android.internal.app.ActionBarImpl您会发现动画是硬编码的.

例如,从3.2:

.method public hide()V
    .locals 8

    .prologue
    const/4 v5, 0x0

    const/4 v7, 0x0

    const/4 v6, 0x1

    .line 529
    iget-object v2, p0, Lcom/android/internal/app/ActionBarImpl;->mCurrentAnim:Landroid/animation/Animator;

    if-eqz v2, :cond_0

    .line 530
    iget-object v2, p0, Lcom/android/internal/app/ActionBarImpl;->mCurrentAnim:Landroid/animation/Animator;

    invoke-virtual {v2}, Landroid/animation/Animator;->end()V

    .line 532
    :cond_0
    iget-object v2, p0, Lcom/android/internal/app/ActionBarImpl;->mContainerView:Lcom/android/internal/widget/ActionBarContainer;

    invoke-virtual {v2}, Lcom/android/internal/widget/ActionBarContainer;->getVisibility()I

    move-result v2

    const/16 v3, 0x8

    if-ne v2, v3, :cond_1

    .line 553
    :goto_0
    return-void

    .line 536
    :cond_1
    iget-boolean v2, p0, Lcom/android/internal/app/ActionBarImpl;->mShowHideAnimationEnabled:Z

    if-eqz v2, :cond_3

    .line 537
    iget-object v2, p0, Lcom/android/internal/app/ActionBarImpl;->mContainerView:Lcom/android/internal/widget/ActionBarContainer;

    const/high16 v3, 0x3f80

    invoke-virtual {v2, v3}, Lcom/android/internal/widget/ActionBarContainer;->setAlpha(F)V

    .line 538
    iget-object v2, p0, Lcom/android/internal/app/ActionBarImpl;->mContainerView:Lcom/android/internal/widget/ActionBarContainer;

    invoke-virtual {v2, v6}, Lcom/android/internal/widget/ActionBarContainer;->setTransitioning(Z)V

    .line 539
    new-instance v0, Landroid/animation/AnimatorSet;

    invoke-direct {v0}, Landroid/animation/AnimatorSet;-><init>()V

    .line 540
    .local v0, anim:Landroid/animation/AnimatorSet;
    iget-object v2, p0, Lcom/android/internal/app/ActionBarImpl;->mContainerView:Lcom/android/internal/widget/ActionBarContainer;

    const-string v3, "alpha"

    new-array v4, v6, [F

    aput v5, v4, v7

    invoke-static {v2, v3, v4}, Landroid/animation/ObjectAnimator;->ofFloat(Ljava/lang/Object;Ljava/lang/String;[F)Landroid/animation/ObjectAnimator;

    move-result-object v2

    invoke-virtual {v0, v2}, Landroid/animation/AnimatorSet;->play(Landroid/animation/Animator;)Landroid/animation/AnimatorSet$Builder;

    move-result-object v1

    .line 541
    .local v1, b:Landroid/animation/AnimatorSet$Builder;
    iget-object v2, p0, Lcom/android/internal/app/ActionBarImpl;->mContentView:Landroid/view/View;

    if-eqz v2, :cond_2

    .line 542
    iget-object v2, p0, Lcom/android/internal/app/ActionBarImpl;->mContentView:Landroid/view/View;

    const-string/jumbo v3, "translationY"

    const/4 v4, 0x2

    new-array v4, v4, [F

    aput v5, v4, v7

    iget-object v5, p0, Lcom/android/internal/app/ActionBarImpl;->mContainerView:Lcom/android/internal/widget/ActionBarContainer;

    invoke-virtual {v5}, Lcom/android/internal/widget/ActionBarContainer;->getHeight()I

    move-result v5

    neg-int v5, v5

    int-to-float v5, v5

    aput v5, v4, v6

    invoke-static {v2, v3, v4}, Landroid/animation/ObjectAnimator;->ofFloat(Ljava/lang/Object;Ljava/lang/String;[F)Landroid/animation/ObjectAnimator;

    move-result-object v2

    invoke-virtual {v1, v2}, Landroid/animation/AnimatorSet$Builder;->with(Landroid/animation/Animator;)Landroid/animation/AnimatorSet$Builder;

    .line 544
    iget-object v2, p0, Lcom/android/internal/app/ActionBarImpl;->mContainerView:Lcom/android/internal/widget/ActionBarContainer;

    const-string/jumbo v3, "translationY"

    new-array v4, v6, [F

    iget-object v5, p0, Lcom/android/internal/app/ActionBarImpl;->mContainerView:Lcom/android/internal/widget/ActionBarContainer;

    invoke-virtual {v5}, Lcom/android/internal/widget/ActionBarContainer;->getHeight()I

    move-result v5

    neg-int v5, v5

    int-to-float v5, v5

    aput v5, v4, v7

    invoke-static {v2, v3, v4}, Landroid/animation/ObjectAnimator;->ofFloat(Ljava/lang/Object;Ljava/lang/String;[F)Landroid/animation/ObjectAnimator;

    move-result-object v2

    invoke-virtual {v1, v2}, Landroid/animation/AnimatorSet$Builder;->with(Landroid/animation/Animator;)Landroid/animation/AnimatorSet$Builder;

    .line 547
    :cond_2
    iget-object v2, p0, Lcom/android/internal/app/ActionBarImpl;->mHideListener:Landroid/animation/Animator$AnimatorListener;

    invoke-virtual {v0, v2}, Landroid/animation/AnimatorSet;->addListener(Landroid/animation/Animator$AnimatorListener;)V

    .line 548
    iput-object v0, p0, Lcom/android/internal/app/ActionBarImpl;->mCurrentAnim:Landroid/animation/Animator;

    .line 549
    invoke-virtual {v0}, Landroid/animation/AnimatorSet;->start()V

    goto :goto_0

    .line 551
    .end local v0           #anim:Landroid/animation/AnimatorSet;
    .end local v1           #b:Landroid/animation/AnimatorSet$Builder;
    :cond_3
    iget-object v2, p0, Lcom/android/internal/app/ActionBarImpl;->mHideListener:Landroid/animation/Animator$AnimatorListener;

    const/4 v3, 0x0

    invoke-interface {v2, v3}, Landroid/animation/Animator$AnimatorListener;->onAnimationEnd(Landroid/animation/Animator;)V

    goto :goto_0
.end method

UPDATE

ICS和JellyBean也是如此

Answer 2

用于禁用ActionBar动画的hack(通过检查源代码找到)可以通过内省来完成:

try
{
  getActionBar().getClass().getDeclaredMethod("setShowHideAnimationEnabled", boolean.class).invoke(getActionBar(), false);
}
catch (Exception exception)
{
  // Too bad, the animation will be run ;(
}

当然很难看,但这实际上是有效的,至少从Android v4.2开始.