你的android我怎么更新视图,包括自定义图形? [英] android how do I update the view to include a custom graphic?
问题描述
我发现这真的很有用code,让我扩展和移动位图,我一直试图找到一种方法,在我的应用程序使用此code。我真的不明白这个类所使用的方式(自学Java的codeR,所以我可以在这里失去了一些基础知识)。基本上,我希望能够开拓库,并挑选可以通过此code使用的文件。我可以做这一切与标准的ImageView但有一个ImageView的我无法缩放/移动。
的主类,它简单地使用touchexampleview类将图像放在屏幕上,并touchexampleview类包含加载默认的图像一行。
米康= context.getResources()getDrawable(R.drawable.ic_launcher)。
我可以工作,如何在课堂上改变这一点,但我希望能够动态地做到这一点,是用户驱动。
下面是主类。
公共类TouchExampleActivity延伸活动{
/ **当第一次创建活动调用。 * /
@覆盖
公共无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState); TouchExampleView视图=新TouchExampleView(本); view.setLayoutParams(新ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT)); 的setContentView(视图); }
}
和touchexampleview类
公共类TouchExampleView扩展视图{
私人可绘制米康;
私人浮动mPosX;
私人浮动mPosY; 私人VersionedGestureDetector mDetector;
私人浮动mScaleFactor = 1.F; 公共TouchExampleView(上下文的背景下){
这(背景下,NULL,0);
} 公共TouchExampleView(上下文的背景下,ATTRS的AttributeSet){
这(背景下,ATTRS,0);
} 公共TouchExampleView(上下文的背景下,ATTRS的AttributeSet,诠释defStyle){
超(背景下,ATTRS,defStyle); 米康= context.getResources()getDrawable(R.drawable.ic_launcher)。
mIcon.setBounds(0,0,mIcon.getIntrinsicWidth(),mIcon.getIntrinsicHeight()); mDetector = VersionedGestureDetector.newInstance(上下文,新GestureCallback());
} @覆盖
公共布尔onTouchEvent(MotionEvent EV){
mDetector.onTouchEvent(EV);
返回true;
} @覆盖
公共无效的onDraw(帆布油画){
super.onDraw(画布); canvas.save();
canvas.translate(mPosX,mPosY);
canvas.scale(mScaleFactor,mScaleFactor);
mIcon.draw(画布);
canvas.restore();
} 私有类GestureCallback实现VersionedGestureDetector.OnGestureListener {
公共ondrag当无效(DX浮动,浮动DY){
mPosX + = DX;
mPosY + =颐;
无效();
} 公共无效onScale(浮动比例因子){
mScaleFactor * =比例因子; //不要让对象获取过小或过大。
mScaleFactor = Math.max(0.1F,Math.min(mScaleFactor,5.0F)); 无效();
}
}
}
我不知道,但是这是你在找什么?
imageSpot.setImageResource(R.drawable.myImage);
I found this really useful code that allows me to scale and move a bitmap and I've been trying to find a way to use this code in my app. I don't really understand the way the class is being used (self taught java coder, so I may be missing some basics here). I basically want to be able to open up gallery and pick a file which can be used by this code. I can do all this with a standard ImageView but with an ImageView I'm unable to scale/move.
The main class, and it simply uses the touchexampleview class to place the image on screen, and the touchexampleview class contains a line which loads a default image.
mIcon = context.getResources().getDrawable(R.drawable.ic_launcher);
I could work out how to change this in the class but I want to be able to do this dynamically and be user driven.
Here is the main class.
public class TouchExampleActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
TouchExampleView view = new TouchExampleView(this);
view.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT));
setContentView(view);
}
}
and the touchexampleview class
public class TouchExampleView extends View {
private Drawable mIcon;
private float mPosX;
private float mPosY;
private VersionedGestureDetector mDetector;
private float mScaleFactor = 1.f;
public TouchExampleView(Context context) {
this(context, null, 0);
}
public TouchExampleView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public TouchExampleView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mIcon = context.getResources().getDrawable(R.drawable.ic_launcher);
mIcon.setBounds(0, 0, mIcon.getIntrinsicWidth(), mIcon.getIntrinsicHeight());
mDetector = VersionedGestureDetector.newInstance(context, new GestureCallback());
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
mDetector.onTouchEvent(ev);
return true;
}
@Override
public void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.save();
canvas.translate(mPosX, mPosY);
canvas.scale(mScaleFactor, mScaleFactor);
mIcon.draw(canvas);
canvas.restore();
}
private class GestureCallback implements VersionedGestureDetector.OnGestureListener {
public void onDrag(float dx, float dy) {
mPosX += dx;
mPosY += dy;
invalidate();
}
public void onScale(float scaleFactor) {
mScaleFactor *= scaleFactor;
// Don't let the object get too small or too large.
mScaleFactor = Math.max(0.1f, Math.min(mScaleFactor, 5.0f));
invalidate();
}
}
}
I am not sure, but is this what you are looking for?
imageSpot.setImageResource(R.drawable.myImage);
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