标签：控件 int public parentView LayoutParams activity ImageView Android 拖拽
DragButton 可移动的VIew
import android.content.Context;
import android.support.v7.widget.AppCompatTextView;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.ViewGroup;
/**
* 可拖拽的view
*/
public class DragButton extends AppCompatTextView {
private int myWidth;
private int myHeight;
//父控件的宽高
private int parentWidth;
private int parentHeight;
//是否拖动
private boolean isDrag = false;
/**
* 父控件
*/
private ViewGroup parentView;
public boolean isDrag() {
return isDrag;
}
public DragButton(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
myWidth = getMeasuredWidth();
myHeight = getMeasuredHeight();
if (parentHeight == 0 || parentWidth == 0) {
parentView = (ViewGroup) getParent();
parentView.post(new Runnable() {
@Override
public void run() {
parentWidth = parentView.getMeasuredWidth();
parentHeight = parentView.getMeasuredHeight();
}
});
}
}
private float downX;
private float downY;
@Override
public boolean onTouchEvent(MotionEvent event) {
if (this.isEnabled()) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
isDrag = false;
downX = event.getX();
downY = event.getY();
break;
case MotionEvent.ACTION_MOVE:
final float xDistance = event.getX() - downX;
final float yDistance = event.getY() - downY;
int l, r, t, b;
//当水平或者垂直滑动距离大于10,才算拖动事件
if (Math.abs(xDistance) > 10 || Math.abs(yDistance) > 10) {
isDrag = true;
//在父控件中左边的位置 = 当前在父控件中的位置 - 内边距 + 拖动的距离
l = (int) (getLeft() - parentView.getPaddingLeft() + xDistance);
//在父控件中的右边位置 = 在左边的位置 + 自己的宽
r = l + myWidth;
t = (int) (getTop() - parentView.getPaddingTop() + yDistance);
b = t + myHeight;
if (l < 0) {
//如果左边的距离超出父控件的左边有效范围，那么这个值会是负数，
// 为了保证在父控件中的拖动，所以设为父控件的左边的起点（包括内边距）
l = parentView.getPaddingLeft();
r = l + myWidth;
} else if (r > (parentWidth - parentView.getPaddingRight())) {
r = parentWidth - parentView.getPaddingRight();
l = r - myWidth;
}
if (t < 0) {
t = parentView.getPaddingTop();
b = t + myHeight;
} else if (b > parentHeight - parentView.getPaddingBottom()) {
b = parentHeight - parentView.getPaddingBottom();
t = b - myHeight;
}
this.layout(l, t, r, b);
}
break;
case MotionEvent.ACTION_UP:
if (isDrag) {
//如果是拖动，就拦截点击事件
return false;
}
break;
}
return super.onTouchEvent(event);
}
return false;
}
}
DragButtonUtil 管理可拖拽View工具类
import android.app.Activity;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.FrameLayout;
import com.deppon.pdam.express.accept.R;
/**
* 管理DragButton工具类
*/
public class DragButtonUtil {
private static DragButton dragButton;
public static DragButton getDragButton(){
return dragButton;
}
public static void createDragButton(Activity activity,int gravity){
FrameLayout frameLayout = new FrameLayout(activity);
dragButton = new DragButton(activity,null);
FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams((int)activity.getResources().getDimension(R.dimen.x269),(int)activity.getResources().getDimension(R.dimen.y299));
//Gravity.BOTTOM | Gravity.RIGHT
lp.gravity = gravity;
lp.bottomMargin=139;
dragButton.setLayoutParams(lp);
frameLayout.addView(dragButton);
ViewGroup.LayoutParams params = new WindowManager.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.MATCH_PARENT);
activity.getWindow().addContentView(frameLayout,params);
}
/**
* 创建属于该activity的DragButton
* @param activity
* @return
*/
public static void createDragButton(Activity activity, int x, int y,int gravity){
FrameLayout frameLayout = new FrameLayout(activity);
dragButton = new DragButton(activity,null);
FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(x,y);
//Gravity.BOTTOM | Gravity.RIGHT
lp.gravity = gravity;
lp.bottomMargin=139;
dragButton.setLayoutParams(lp);
frameLayout.addView(dragButton);
ViewGroup.LayoutParams params = new WindowManager.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.MATCH_PARENT);
activity.getWindow().addContentView(frameLayout,params);
}
public static void hidedragButton(){
dragButton.setVisibility(View.GONE);
}
public static void showDragButton(){
dragButton.setVisibility(View.VISIBLE);
}
public static void destoryDragButton(){
dragButton=null;
}
}
使用案例
//传入显示的Activity 默认右下角
DragButtonUtil.createDragButton(getActivity(), Gravity.BOTTOM | Gravity.RIGHT);
//获取控件
DragButton scanV= DragButtonUtil.getDragButton();
//设置控件图片
scanV.setBackgroundResource(R.mipmap.fab_saomiao);
scanV.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.i("LOG"，“点击了”)；
}
});
标签：控件,int,public,parentView,LayoutParams,activity,ImageView,Android,拖拽 来源： https://www.cnblogs.com/lingsuiwang/p/14822161.html
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