我有一个AppCompat工具栏的应用程序,如下所示
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:layout_weight="0">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical">
<LinearLayout
android:id="@+id/toolbar_bg"
android:animateLayoutChanges="true"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="0dp"
android:gravity="right|center_vertical"
android:padding="0dp">
<TextView
android:animateLayoutChanges="true"
android:id="@+id/action_bar_restaurant_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="@dimen/restaurant_label_action_bar_margin_start"
android:layout_weight="1"
android:ellipsize="end"
android:gravity="left"
android:singleLine="true"
android:textColor="@color/white"
android:shadowDy="1"
android:shadowDx="1"
android:shadowRadius="1"
android:shadowColor="@color/black"
android:textSize="@dimen/restaurant_label_action_bar_font_size"
/>
<LinearLayout
android:focusable="true"
android:layout_weight="1"
android:animateLayoutChanges="true"
android:id="@+id/search_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginRight="14dp"
android:gravity="center_vertical"
android:background="@drawable/search_bg_focused"
android:orientation="horizontal">
<AutoCompleteTextView
android:id="@+id/search_view"
android:layout_width="0dp"
android:background="@color/transparent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center_vertical"
android:hint="@string/search"
android:imeOptions="actionSearch"
android:inputType="text"
android:maxLines="1"
android:paddingLeft="2dp"
android:paddingBottom="4dp"
android:shadowColor="@color/black"
android:shadowDx="1"
android:shadowDy="1"
android:shadowRadius="1"
android:singleLine="true"
android:textColor="#FFFFFFFF"
android:textColorHint="#FFFFFFFF"
style="@style/Base.Widget.AppCompat.EditText"
/>
<ImageView
android:id="@+id/search_clear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:paddingLeft="16dp"
android:paddingRight="0dp"
android:src="@drawable/abc_ic_clear_mtrl_alpha" />
</LinearLayout>
.
.
. (more content here but it has not effect)
. (I already tried removing them and had the same behavior)
.
.
</LinearLayout>
</android.support.v7.widget.Toolbar>
</LinearLayout>
然后,当用户使用以下代码在滚动视图中滚动时,我以编程方式更改背景颜色和Alpha:
public void updateActionBarBackground(int scrollY,int initialScroll) { float alphaRatio =((1f * scrollY) - (1f * initialScroll))/(1f * initialScroll);
int alpha = Math.min((int) Math.round(alphaRatio * MAX_ALPHA_VALUE), MAX_ALPHA_VALUE);
Drawable bg = getResources().getDrawable(R.drawable.actionbar_background);
Drawable bgStatus = getResources().getDrawable(R.drawable.statusbar_background);
bg.setAlpha(alpha);
bgStatus.setAlpha(alpha);
getSupportActionBar().setBackgroundDrawable(bg);
// The following part is not important it's a lib for navigation and status bar
tintManager.setStatusBarTintDrawable(bg);
tintManager.setNavigationBarAlpha(0);
}
给出背景&#34; drawable / actionbar_background.xml&#34;实际上如下:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
<solid android:color="#CC0000"></solid>
</shape>
我从这个工具栏的外观开始:
当我点击工具栏中任何可修改工具栏内容的内容时(例如显示搜索字段),我经常会遇到以下情况:
但是一旦我调用上面的方法(它重置了背景可绘制)并且工具栏的整个背景(可绘制)再次可见。
我在这里做错了什么?
这只是在我从ActionBar迁移到工具栏时才开始发生
Kitkat 4.4.x,Lollipop 5.0和5.1上的相同行为
有人建议:工具栏默认不重绘其背景可绘制
但是我怎么能强制它,而不是在每次更改后手动操作并看到这种闪烁效果?
答案 0 :(得分:0)
我刚刚在2个月后想出了解决方案!!
只是更改用于设置背景的方法,使其设置颜色而不是Background Drawable似乎解决了问题:
public void updateActionBarBackground(int scrollY, int initialScroll)
{
float alphaRatio = ((1f * scrollY) - (1f * initialScroll)) / (1f * initialScroll);
int alpha = Math.min((int) Math.round(alphaRatio * MAX_ALPHA_VALUE), MAX_ALPHA_VALUE);
Drawable bg = getResources().getDrawable(R.drawable.actionbar_background);
Drawable bgStatus = getResources().getDrawable(R.drawable.statusbar_background);
bg.setAlpha(alpha);
bgStatus.setAlpha(alpha);
toolbar.setBackgroundColor(getResources().getColor(R.color.medium_red));
toolbar.getBackground().setAlpha(alpha);
tintManager.setStatusBarTintDrawable(bg);
tintManager.setNavigationBarAlpha(0);
}