如何从VectorDrawable获取位图 [英] How to get a Bitmap from VectorDrawable
问题描述
我仍在尝试解决几天前以来遇到的问题,但仍然没有找到解决方案.但是,我要逐步到达那里.现在我遇到了另一个障碍.
I'm still trying to solve the problem I've had since a couple of days ago and I still have not found a solution. However, I am getting there step by step. Now I have run into another roadblock.
我试图获取Bitmap.getpixel(int x, int y)
以返回用户使用OnTouchListener
触摸过的内容的Color
.馅饼是VectorDrawable
资源,vectordrawable.xml
我不需要对像素数据做任何事情,我只需要对其进行测试.所以我做了一个TextView
,它将吐出被触摸的Color
.
I am trying to get Bitmap.getpixel(int x, int y)
to return the Color
of what the user has touched using OnTouchListener
. The pie is a VectorDrawable
resource, vectordrawable.xml
I don't need to do anything with the pixel data yet, I just need to test it. So I made a TextView
that will spit out the Color
touched.
public class MainActivity extends AppCompatActivity {
ImageView imageView;
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = (ImageView) findViewById(R.id.imageView);
textView = (TextView) findViewById(R.id.textView);
imageView.setOnTouchListener(imageViewOnTouchListener);
}
View.OnTouchListener imageViewOnTouchListener = new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent event) {
Drawable drawable = ((ImageView)view).getDrawable();
//Bitmap bitmap = BitmapFactory.decodeResource(imageView.getResources(),R.drawable.vectordrawable);
Bitmap bitmap = ((BitmapDrawable)drawable).getBitmap();
int x = (int)event.getX();
int y = (int)event.getY();
int pixel = bitmap.getPixel(x,y);
textView.setText("touched color: " + "#" + Integer.toHexString(pixel));
return true;
}
};
}
但是,当我触摸ImageView
并给出不幸的是..."消息并退出时,我的应用程序会遇到致命错误.在堆栈跟踪中,我找到了.
But my app encounters a fatal error as soon as I touch the ImageView
, gives the "Unfortunately,..." message and quits. In the stack trace, I found this.
java.lang.ClassCastException: android.graphics.drawable.VectorDrawable cannot be cast to android.graphics.drawable.BitmapDrawable
at com.skwear.colorthesaurus.MainActivity$1.onTouch(MainActivity.java:38)
第38行就是这个
Bitmap bitmap = ((BitmapDrawable)drawable).getBitmap();
我有点关注此.我究竟做错了什么?是因为它是VectorDrawable
.如何获得Color
?您可以看到我也尝试过BitmapFactory
来投射Drawable
.由于VectorDrawable
的API级别也是如此,因为它是像API 21一样添加的?
I kind of followed this. What am I doing wrong? Is it because it's a VectorDrawable
. What can I do to get the Color
? You can see that I have also tried BitmapFactory
to cast the Drawable
. Could it also be a problem with the API level of VectorDrawable
since it was added like API 21?
推荐答案
首先,您不能将VectorDrawable
强制转换为BitmapDrawable
.他们没有亲子关系.它们都是Drawable
类的直接子类.
First of all, you cannot cast VectorDrawable
to BitmapDrawable
. They don't have a parent-child relationship. They both are direct subclasses of Drawable
class.
现在,要从可绘制对象中获取位图,您将需要从可绘制元数据中创建一个Bitmap
.
Now, to get a bitmap from drawable, you will need to create a Bitmap
from the drawable metadata.
可能在单独的方法中是这样的
Probably something like this in a separate method,
try {
Bitmap 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;
} catch (OutOfMemoryError e) {
// Handle the error
return null;
}
我希望这会有所帮助.
这篇关于如何从VectorDrawable获取位图的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!