[英]How do I go about adding images to a bitmap in Android Studio?
我希望能够在位图上添加“兴趣点”,例如可以单击以显示信息的google map pin。
我只需要知道如何将图钉添加到空间中并将其保持在位图的正确点上(我可以在位图上平移和缩放)
抱歉,我是Android Studio的新手,在此先感谢您! :)
您可以在位图上绘制一个对象,并实现触摸回调,以验证是否确实按下了标记。 这是一个简单的例子:
<com.myproject.RedImageView
android:id="@+id/imageView"
android:layout_width="300dp"
android:layout_height="300dp"
android:layout_centerHorizontal="true"
android:layout_centerInParent="true"
android:layout_centerVertical="true"
android:background="@android:color/holo_red_dark" />
package com.myproject;
public class RedImageView extends View {
private Paint mPaint;
private Rect mRect;
public RedImageView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
//Draw a small white rectangle on top of our red ImageView
private void init() {
mPaint = new Paint();
mPaint.setColor(Color.WHITE);
mRect = new Rect(20, 20, 120, 120);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawRect(mRect, mPaint);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
//Simple touch gesture has started
if (event.getAction() == MotionEvent.ACTION_DOWN) {
int x = (int) event.getX();
int y = (int) event.getY();
//Match touch coordinates vs "Point of Interest" aka small white rectangle
if (mRect.contains(x, y)) {
Snackbar.make(this, "Clicked white", Snackbar.LENGTH_SHORT).show();
}
}
return super.onTouchEvent(event);
}
}
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