一个简单的自定义view， 可以随意拖动一个view
视频上传不了 。。。。。。 你就看动没动吧！
package com.example.missliproject.view;
/**
* @author lwh
* @description :
* @date 2021/3/19.
*/
import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.missliproject.R;
public class DragView extends FrameLayout {
private float mStartX;
private float mStartY;
private int rawX;
private int rawY;
private int lastX;
private int lastY;
private int pHeight;
private int pWidth;
private long mLastTime;
private ViewGroup parent;
private ImageView iv_close;
private TextView iv_pic;
private OnDragViewClickListener dragViewClickListener;
private boolean flag = false;
public void SetClickListener(OnDragViewClickListener dragViewClickListener) {
this.dragViewClickListener = dragViewClickListener;
}
public DragView(Context context) {
this(context, null);
}
public DragView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public DragView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
LayoutInflater inflater = LayoutInflater.from(context);
View view = inflater.inflate(R.layout.layout_dragview, this);
iv_close = view.findViewById(R.id.iv_close);
iv_pic = view.findViewById(R.id.iv_pic);
}
//判断是否触摸view
private boolean isTouchInView(ImageView view, float xAxis, float yAxis) {
if (view == null) {
return false;
}
int[] location = new int[2];
view.getLocationOnScreen(location);//以屏幕为原点当前这个view的坐标
int left = location[0];//获取当前Imagview的横坐标（在屏幕中的）
int top = location[1];//获取当前Imagview的纵坐标（在屏幕中的）
int right = left + view.getMeasuredWidth();//这是view右边的坐标
int bottom = top + view.getMeasuredHeight();//这个view下边的坐标
if (yAxis >= top && yAxis <= bottom && xAxis >= left
&& xAxis <= right) {
return true;
}
return false;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
//获取相对屏幕的坐标，即以屏幕左上角为原点
rawX = (int) event.getRawX();
rawY = (int) event.getRawY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: //捕获手指触摸按下动作
//获取相对View的坐标，即以此View左上角为原点
mStartX = event.getRawX();
mStartY = event.getRawY();
if (isTouchInView(iv_close, rawX, rawY)) {
flag = true;
}
mLastTime = System.currentTimeMillis();
lastX = rawX;//记录按下去x的坐标
lastY = rawY;//记录按下去y的坐标
if (getParent() != null) {
parent = (ViewGroup) getParent();
pHeight = parent.getHeight();
pWidth = parent.getWidth();
}
break;
case MotionEvent.ACTION_MOVE: //捕获手指触摸移动动作
int dx = rawX - lastX;//横轴变化的距离
int dy = rawY - lastY;//纵轴变化的距离
float x = getX() + dx;//
float y = getY() + dy;
//判断是否到边界
x = x < 0 ? 0 : x > pWidth - getWidth() ? pWidth - getWidth() : x;
y = getY() < 0 ? 0 : getY() + getHeight() > pHeight ? pHeight - getHeight() : y;
setX(x);
setY(y);
lastX = rawX;
lastY = rawY;
break;
case MotionEvent.ACTION_UP: //捕获手指触摸离开动作
if (System.currentTimeMillis() - mLastTime < 800) {
if (Math.abs(mStartX - event.getRawX()) < 10.0 && Math.abs(mStartY - event.getRawY()) < 10.0) {
//处理点击的事件
if (flag) {
dragViewClickListener.onDragViewListener("delete", "");
} else
dragViewClickListener.onDragViewListener("pic", "");
}
}
flag = false;
break;
}
return true;
}
public interface OnDragViewClickListener {
void onDragViewListener(String name, String context);
}
}
<com.example.missliproject.view.DragView
android:id="@+id/drag_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
drag_view = findViewById(R.id.drag_view);
drag_view.SetClickListener(new DragView.OnDragViewClickListener() {
@Override
public void onDragViewListener(String name, String context) {
if(name.equals("delete")){
Toast.makeText(HomeActivity.this, "删除", Toast.LENGTH_SHORT).show();
}
if(name.equals("pic")){
Toast.makeText(HomeActivity.this, "图片", Toast.LENGTH_SHORT).show();
}
}
});
就这。。。