如何将一个layout 设置成view的背景颜色

f分为三步:

1.编写布局文件

如: gradient_background.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="@dimen/leanback_control_panel_shadow_width"
    android:layout_height="@dimen/leanback_control_panel_shadow_height"
    android:orientation="vertical">

    <View
        android:layout_width="match_parent"
        android:layout_height="@dimen/leanback_control_panel_shadow_top_transparent_height"
        android:background="@android:color/transparent"
        />
    <View
        android:layout_width="match_parent"
        android:layout_weight="1"
        android:background="@drawable/gradient_background"
        android:layout_height="0dp"/>

    <View
        android:layout_width="match_parent"
        android:layout_height="@dimen/leanback_control_panel_shadow_bottom_shadow_height"
        android:background="#B3000000"
        />
</LinearLayout>

2.加载layout 

LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View layout = inflater.inflate(R.layout.gradient_background, null);

3.将布局文件转换成Bitmap

private Drawable getDrawableOfView(View view) {
        ViewGroup.LayoutParams layoutParams = view.getLayoutParams();
        int widthMeasureSpec = View.MeasureSpec.makeMeasureSpec(layoutParams.width, View.MeasureSpec.EXACTLY);
        int heightMeasureSpec = View.MeasureSpec.makeMeasureSpec(layoutParams.height, View.MeasureSpec.EXACTLY);
        view.measure(widthMeasureSpec, heightMeasureSpec);
        view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
        Bitmap bitmap = Bitmap.createBitmap(view.getMeasuredWidth(), view.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        view.draw(canvas);
        return new BitmapDrawable(getResources(), bitmap);
    }

4.将Drawable 设置为targetView 的背景

mBackgroundView.setBackground(getDrawableOfView(layout));