从vector绘制获取位图
在我的应用程序中,我必须设置一个通知的大图标。 LargeIcon必须是一个位图,我的绘图是vector图像(Android中的新function,请参阅此链接 )问题是,当我尝试解码一个vector图像的资源,我得到一个空返回。
以下是代码示例:
if (BitmapFactory.decodeResource(arg0.getResources(), R.drawable.vector_menu_objectifs) == null) Log.d("ISNULL", "NULL"); else Log.d("ISNULL", "NOT NULL");
在这个示例中,当我用一个“普通”图像replaceR.drawable.vector_menu_objectifs,一个PNG为例,结果不是空(我得到正确的位图)是否有什么我失踪?
检查API:17,21,23
public static Bitmap getBitmapFromVectorDrawable(Context context, int drawableId) { Drawable drawable = ContextCompat.getDrawable(context, drawableId); if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) { drawable = (DrawableCompat.wrap(drawable)).mutate(); } Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(bitmap); drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight()); drawable.draw(canvas); return bitmap; }
更新:
项目gradle:
dependencies { classpath 'com.android.tools.build:gradle:2.2.0-alpha5' }
模块gradle:
android { compileSdkVersion 23 buildToolsVersion '23.0.3' defaultConfig { minSdkVersion 16 targetSdkVersion 23 vectorDrawables.useSupportLibrary = true } ... } ...
您可以使用以下方法:
@TargetApi(Build.VERSION_CODES.LOLLIPOP) private static Bitmap getBitmap(VectorDrawable vectorDrawable) { Bitmap bitmap = Bitmap.createBitmap(vectorDrawable.getIntrinsicWidth(), vectorDrawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(bitmap); vectorDrawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight()); vectorDrawable.draw(canvas); return bitmap; }
我有时把它们结合起来:
private static Bitmap getBitmap(Context context, int drawableId) { Drawable drawable = ContextCompat.getDrawable(context, drawableId); if (drawable instanceof BitmapDrawable) { return ((BitmapDrawable) drawable).getBitmap(); } else if (drawable instanceof VectorDrawable) { return getBitmap((VectorDrawable) drawable); } else { throw new IllegalArgumentException("unsupported drawable type"); } }
基于之前的答案,可以简化为像匹配VectorDrawable和BitmapDrawable,并至less与API 15兼容。
public static Bitmap getBitmapFromDrawable(Context context, @DrawableRes int drawableId) { Drawable drawable = ContextCompat.getDrawable(context, drawableId); if (drawable instanceof BitmapDrawable) { return ((BitmapDrawable) drawable).getBitmap(); } else if (drawable instanceof VectorDrawableCompat || drawable instanceof VectorDrawable) { Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(bitmap); drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight()); drawable.draw(canvas); return bitmap; } else { throw new IllegalArgumentException("unsupported drawable type"); } }
那么你必须添加你的gradle文件:
android { defaultConfig { vectorDrawables.useSupportLibrary = true } }
在前棒棒糖将使用VectorDrawableCompat和棒棒糖将使用VectorDrawable。
编辑
我在@ user3109468的评论之后编辑了条件