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今天就跟大家聊聊有关怎么在Android中通过自定义View实现一个自动吸附功能，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。
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import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.animation.DecelerateInterpolator;
import android.widget.ImageView;
public class AdsorbentViews extends ImageView {
private int maxWidth;
private int maxHeight;
private int viewWidth;
private int viewHeight;
private float downx;
private float downy;
private Context mContext;
public CustomViews(Context context) {
this(context, null);
}
public CustomViews(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CustomViews(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mContext = context;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
DisplayMetrics outMetrics = new DisplayMetrics();
WindowManager windowManager = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
windowManager.getDefaultDisplay().getRealMetrics(outMetrics);
//屏幕的宽度
maxWidth = outMetrics.widthPixels;
//屏幕的高度
maxHeight = outMetrics.heightPixels;
/**
* 控件的宽高
*/
viewWidth = canvas.getWidth();
viewHeight = canvas.getHeight();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
clearAnimation();
downx = event.getX();
downy = event.getY();
return true;
case MotionEvent.ACTION_MOVE:
float moveX = event.getRawX() - downx;
float moveY = event.getRawY() - downy;
moveX = moveX < 0 ? 0 : (moveX + viewWidth > maxWidth) ? (maxWidth - viewWidth) : moveX;
moveY = moveY < 0 ? 0 : (moveY + viewHeight) > maxHeight ? (maxHeight - viewHeight) : moveY;
this.setY(moveY);
this.setX(moveX);
return true;
case MotionEvent.ACTION_UP:
//做吸附效果
float centerX = getX() + viewWidth / 2;
if (centerX > maxWidth/2){
//靠右吸附
animate().setInterpolator(new DecelerateInterpolator())
.setDuration(500)
.x(maxWidth-viewWidth)
.y(maxHeight-viewHeight)
.start();
}else {
animate().setInterpolator(new DecelerateInterpolator())
.setDuration(500)
.x(0)
.y(maxHeight-viewHeight)
.start();
}
return true;
default:
return super.onTouchEvent(event);
}
}
}看完上述内容，你们对怎么在Android中通过自定义View实现一个自动吸附功能有进一步的了解吗？如果还想了解更多知识或者相关内容，请关注创新互联行业资讯频道，感谢大家的支持。
