问题
I have a layout resource like this and a I want to inflate it with the layout width and height:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="75px"
android:layout_height="25px">
<TextView
android:id="@+id/drawable_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:text="Name" />
<TextView
android:id="@+id/drawable_description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@id/drawable_name"
android:layout_alignParentLeft="true"
android:gravity="center_horizontal"
android:layout_below="@+id/drawable_name"
android:text="Some Text" />
</RelativeLayout>
The View could be anything, and I'm converting it to Bitmap.
private Bitmap getBitmap(View v){
v.measure(MeasureSpec.makeMeasureSpec(mDrawableWidth, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(mDrawableHeight, MeasureSpec.EXACTLY));
v.layout(0, 0, mDrawableWidth, mDrawableHeight);
Bitmap returnedBitmap = Bitmap.createBitmap(mDrawableWidth, mDrawableHeight,Bitmap.Config.ARGB_8888);
Canvas c=new Canvas(returnedBitmap);
v.draw(c);
return returnedBitmap;
}
Until now, I have the Width and Height hardcoded and I want to be able to do it programatically, accessing the layout_width
and layout_height
.
Is there any way to achieve this?
If there's another way of inflating the view with this values without specifying them in the measure, please let me know.
If I create a Custom View, is there any chance of specifying the fixed width and height?
回答1:
This example should work. Might take some tweaking to get it perfect, depending on your needs, but give it a shot:
//Get a bitmap from a layout resource. Inflates it into a discarded LinearLayout
//so that the LayoutParams are preserved
public static Bitmap getLayoutBitmap (Context c, int layoutRes, int maxWidth, int maxHeight) {
View view = LayoutInflater.from(c).inflate(layoutRes, new LinearLayout(c), false);
return getViewBitmap(view, maxWidth, maxHeight);
}
public static Bitmap getViewBitmap (View v, int maxWidth, int maxHeight) {
ViewGroup.LayoutParams vParams = v.getLayoutParams();
//If the View hasn't been attached to a layout, or had LayoutParams set
//return null, or handle this case however you want
if (vParams == null) {
return null;
}
int wSpec = measureSpecFromDimension(vParams.width, maxWidth);
int hSpec = measureSpecFromDimension(vParams.height, maxHeight);
v.measure(wSpec, hSpec);
final int width = v.getMeasuredWidth();
final int height = v.getMeasuredHeight();
//Cannot make a zero-width or zero-height bitmap
if (width == 0 || height == 0) {
return null;
}
v.layout(0, 0, width, height);
Bitmap result = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(result);
v.draw(canvas);
return result;
}
private static int measureSpecFromDimension (int dimension, int maxDimension) {
switch (dimension) {
case ViewGroup.LayoutParams.MATCH_PARENT:
return View.MeasureSpec.makeMeasureSpec(maxDimension, View.MeasureSpec.EXACTLY);
case ViewGroup.LayoutParams.WRAP_CONTENT:
return View.MeasureSpec.makeMeasureSpec(maxDimension, View.MeasureSpec.AT_MOST);
default:
return View.MeasureSpec.makeMeasureSpec(dimension, View.MeasureSpec.EXACTLY);
}
}
回答2:
One option is to define constants for layout_width
and layout_height
in the form of attributes and access them programatically in getBitmap
.
来源:https://stackoverflow.com/questions/18565226/programmatically-inflate-view-with-pre-defined-measures