中发光的Android触摸屏幕时?
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22-09-2019 - |
题
当我触摸徘徊无论在屏幕点将发光(只是象一个闪光或光亮性)一段时间。怎么做?任何示例或想法??我要实现把上的按钮。什么时候我触摸屏幕就会发光一段时间,然后按钮会出现在那里我碰到了点。
解决方案
您将不得不创建一个自定义视图和覆盖的onTouchEvent和借鉴。这里是一个非常简单的例子。可以参考一个自定义视图中的XML布局如果使用包名称即com.test.CustomView。
public class CustomView extends ImageView{
public CustomView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public CustomView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CustomView(Context context) {
super(context);
}
boolean drawGlow = false;
//this is the pixel coordinates of the screen
float glowX = 0;
float glowY = 0;
//this is the radius of the circle we are drawing
float radius = 20;
//this is the paint object which specifies the color and alpha level
//of the circle we draw
Paint paint = new Paint();
{
paint.setAntiAlias(true);
paint.setColor(Color.WHITE);
paint.setAlpha(50);
};
@Override
public void draw(Canvas canvas){
super.draw(canvas);
if(drawGlow)
canvas.drawCircle(glowX, glowY, radius, paint);
}
@Override
public boolean onTouchEvent(MotionEvent event){
if(event.getAction() == MotionEvent.ACTION_DOWN){
drawGlow = true;
}else if(event.getAction() == MotionEvent.ACTION_UP)
drawGlow = false;
glowX = event.getX();
glowY = event.getY();
this.invalidate();
return true;
}
}
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