[英]How do I go about adding images to a bitmap in Android Studio?
我希望能夠在位圖上添加“興趣點”,例如可以單擊以顯示信息的google map pin。
我只需要知道如何將圖釘添加到空間中並將其保持在位圖的正確點上(我可以在位圖上平移和縮放)
抱歉,我是Android Studio的新手,在此先感謝您! :)
您可以在位圖上繪制一個對象,並實現觸摸回調,以驗證是否確實按下了標記。 這是一個簡單的例子:
<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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