为 Android 的 Google 地图标记使用 xml 布局 [英] Using an xml Layout for a Google Map Marker for Android

问题描述

I want to use a layout and not a drawable for my marker I am using with Google Maps Api 2 for an Android app.

Like this:

  Marker m = googleMap
                        .addMarker(new MarkerOptions()
                                .position(LOC)
                                .snippet(user)
                                .title(name)
                                .icon(BitmapDescriptorFactory.fromResource(R.layout.map_marker)));

However, it seems this is only designed for use from drawable folder.

I simply what an image with a background where I can change colors based on marker type. This is the layout I want to use:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="50dp"
    android:layout_height="50dp"
    android:background="#222"
    android:id="@+id/llMarker">

    <ImageView
        android:id="@+id/ivMarker"
        android:layout_marginTop="5dp"
        android:layout_width="40dp"
        android:layout_height="40dp" />

</LinearLayout>

Pretty basic. How can I use this as a marker? (or at least replicate the end result that I am going for?)

The documents say you can use this:

fromResource (int resourceId)

So I assumed a layout might work.

UPDATE:

I have taken the concept from answer below and reworked some things; this still is not working; no errors. Just will not show image.

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

        m = googleMap
                .addMarker(new MarkerOptions()
                        .position(LOC)
                        .snippet(user)
                        .title(name)
                        .icon(BitmapDescriptorFactory.fromBitmap(loadBitmapFromView(v))));

// method

  public static Bitmap loadBitmapFromView(View v) {

        if (v.getMeasuredHeight() <= 0) {
            v.measure(WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT);
            Bitmap b = Bitmap.createBitmap(v.getMeasuredWidth(), v.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
            Canvas c = new Canvas(b);
            v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());
            v.draw(c);
            return b;
        }
        return null;
    }

解决方案

You cannot directly use a layout with BitmapDescriptorFactory.fromResource():

Creates a BitmapDescriptor using the resource id of an image.

However, you could draw the layout into a bitmap, and then use that. You'd need to:

• Inflate the layout from xml (with a LayoutInflater).
• Change whatever properties you want (e.g. background color).
• Render this layout into a Bitmap, via Canvas, for example as described here.
• Pass this bitmap into BitmapDescriptorFactory.fromBitmap().

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