3
我有一個形象上我把一個彩色疊加,像這樣(的顏色從here拍攝):設置漸變背景通過編程
佈局/ list_item_view.xml
<View
android:id="@+id/image_cover_gradient"
android:layout_width="fill_parent"
android:layout_height="80dip"
android:layout_alignParentTop="true"
android:layout_marginTop="70dp"
android:background="@drawable/gradient_blue"
/>
繪製/ gradient_blue.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape>
<gradient
android:angle="90"
android:startColor="@color/CornflowerBlue"
android:endColor="@color/Transparent"
android:type="linear" />
</shape>
</item>
</selector>
這總是會產生一個藍色覆蓋層(CornflowerBlue),並且它按預期工作。
現在我試圖以編程方式執行此操作,並遵循一些stackoverflow答案(如this),但仍然無法使其工作。這裏是我的代碼:
private void setColor(int color){
View gradientCover = view.findViewById(R.id.image_cover_gradient);
// this FAILS because it's a StateListDrawable
//GradientDrawable coverGd = (GradientDrawable) gradientCover.getBackground();
//coverGd.setColor(color);
//this doesn't seem to work either (I don't see any effect on the image)
GradientDrawable drawable = new GradientDrawable(
Orientation.BOTTOM_TOP, new int[] { color, resources.getColor(R.color.Transparent)
});
StateListDrawable sld = new StateListDrawable();
sld.addState(new int[] { android.R.attr.startColor, android.R.attr.endColor}, drawable);
gradientCover.setBackground(sld);
}
感謝您的幫助。
擺脫StateListDrawable的,你需要的是GradientDrawable – pskink 2014-09-01 14:21:56