Android 拖动ImageView时侦听容器边缘
我有一个比它所显示的容器大的图像。图像可在容器内拖动,当前可在容器内的任何位置拖动。我希望在图像顶部与容器顶部匹配时停止拖动图像 我的代码:Android 拖动ImageView时侦听容器边缘,android,android-layout,position,Android,Android Layout,Position,我有一个比它所显示的容器大的图像。图像可在容器内拖动,当前可在容器内的任何位置拖动。我希望在图像顶部与容器顶部匹配时停止拖动图像 我的代码: @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fra
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
frame = (ViewGroup) rootView.findViewById(R.id.frame1);
imageView = (ImageView) rootView.findViewById(R.id.imageView1);
imageView.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
final int X = (int) event.getRawX();
final int Y = (int) event.getRawY();
LayoutParams layoutParams = (LayoutParams) imageView.getLayoutParams();
Log.d("Alert", imageView.getId() + " pressed");
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
RelativeLayout.LayoutParams lParams = (RelativeLayout.LayoutParams) imageView.getLayoutParams();
_xDelta = X - lParams.leftMargin;
_yDelta = Y - lParams.topMargin;
break;
case MotionEvent.ACTION_UP:
//Do Nothing
break;
case MotionEvent.ACTION_POINTER_DOWN:
//Do Nothing
break;
case MotionEvent.ACTION_POINTER_UP:
//Do Nothing
break;
case MotionEvent.ACTION_MOVE:
layoutParams = (RelativeLayout.LayoutParams) imageView.getLayoutParams();
layoutParams.leftMargin = X - _xDelta;
layoutParams.topMargin = Y - _yDelta;
v.setLayoutParams(layoutParams);
break;
}
frame.invalidate();
return true;
}
});
return rootView;
}
}
<RelativeLayout
android:id="@+id/frame1"
android:layout_width="wrap_content"
android:layout_height="130dp"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:background="#000" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:scaleType="matrix"
android:src="@drawable/image1" />
</RelativeLayout>
@覆盖
创建视图上的公共视图(布局、充气机、视图组容器、,
Bundle savedInstanceState){
视图根视图=充气机。充气(R.layout.fragment_main,容器,
假);
frame=(ViewGroup)rootView.findviewbyd(R.id.frame1);
imageView=(imageView)rootView.findViewById(R.id.imageView1);
setOnTouchListener(新的OnTouchListener(){
@凌驾
公共布尔onTouch(视图v,运动事件){
final int X=(int)event.getRawX();
final int Y=(int)event.getRawY();
LayoutParams LayoutParams=(LayoutParams)imageView.getLayoutParams();
Log.d(“警报”,imageView.getId()+“按下”);
开关(event.getAction()&MotionEvent.ACTION\u掩码){
case MotionEvent.ACTION\u DOWN:
RelativeLayout.LayoutParams lParams=(RelativeLayout.LayoutParams)imageView.getLayoutParams();
_xDelta=X-lParams.leftMargin;
_yDelta=Y-lParams.topMargin;
打破
case MotionEvent.ACTION\u UP:
//无所事事
打破
case MotionEvent.ACTION\u指针\u向下:
//无所事事
打破
case MotionEvent.ACTION\u指针\u向上:
//无所事事
打破
case MotionEvent.ACTION\u移动:
layoutParams=(RelativeLayout.layoutParams)imageView.getLayoutParams();
layoutParams.leftMargin=X-xDelta;
layoutParams.topMargin=Y-_yDelta;
v、 setLayoutParams(layoutParams);
打破
}
frame.invalidate();
返回true;
}
});
返回rootView;
}
}
我想阻止图像被拖到超出其容器边界的地方。例如,图像顶部应被拖到不超过布局容器顶部的地方。经过几天的代码修补,我终于找到了解决问题的有效方法。我将在这里发布代码
View frame;
ImageView imageView;
//stores position of finger during drag operation
private int _xDelta;
private int _yDelta;
//Stores the boundaries of the Frame
private int frameWidth;
private int frameHeight;
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
frame = (View) rootView.findViewById(R.id.frame1);
imageView = (ImageView) rootView.findViewById(R.id.imageView1);
//Get frame width and height once it has been drawn.
frame.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
// set global variables
frameWidth = getView().getWidth();
frameHeight = getView().getHeight();
//Log.e("Framewidth", "" + frameWidth);
Log.e("FrameHeight", "" + frameHeight);
}
});
//ontouch listener that controls the Drag functionality of the keyboard.
imageView.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
//get x and y cords of the user touch
final int X = (int) event.getRawX();
final int Y = (int) event.getRawY();
LayoutParams layoutParams = (LayoutParams) imageView.getLayoutParams();
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
RelativeLayout.LayoutParams lParams = (RelativeLayout.LayoutParams) imageView.getLayoutParams();
_xDelta = X - lParams.leftMargin;
_yDelta = Y - lParams.topMargin;
break;
case MotionEvent.ACTION_UP:
//Do Nothing
break;
case MotionEvent.ACTION_POINTER_DOWN:
//Do Nothing
break;
case MotionEvent.ACTION_POINTER_UP:
//Do Nothing
break;
case MotionEvent.ACTION_MOVE:
layoutParams = (RelativeLayout.LayoutParams) imageView.getLayoutParams();
Log.e("Test", "" + imageView.getX() + " , " + imageView.getY());
layoutParams.leftMargin = X - _xDelta;
layoutParams.topMargin = Y - _yDelta;
//stops the outer edges of the image from being dragged past the
//frames outer edges.
if(((int)layoutParams.topMargin) >= 1) {
layoutParams.topMargin = 0;
if(((int)layoutParams.leftMargin) >= 1){
layoutParams.leftMargin = 0;
}else if(((int)layoutParams.leftMargin) <= -291){
layoutParams.leftMargin = -290;
}
} else if(((int)layoutParams.topMargin) <= -70) {
layoutParams.topMargin = -68;
if(((int)layoutParams.leftMargin) >= 1){
layoutParams.leftMargin = 0;
}else if(((int)layoutParams.leftMargin) <= -291){
layoutParams.leftMargin = -290;
}
} else if(((int)layoutParams.leftMargin) >= 1){
layoutParams.leftMargin = 0;
} else if(((int)layoutParams.leftMargin) <= -291) {
layoutParams.leftMargin = -290;
}
v.setLayoutParams(layoutParams);
break;
}
frame.invalidate();
return true;
}
});
return rootView;
}
}
视图框架;
图像视图图像视图;
//在拖动操作期间存储手指的位置
私人国际电信公司;
私人国际酒店;
//存储框架的边界
私有整数帧宽度;
私有整数帧高度;
公共占位符片段(){
}
@凌驾
创建视图上的公共视图(布局、充气机、视图组容器、,
Bundle savedInstanceState){
视图根视图=充气机。充气(R.layout.fragment_main,容器,
假);
frame=(视图)rootView.findviewbyd(R.id.frame1);
imageView=(imageView)rootView.findViewById(R.id.imageView1);
//绘制帧后,获取帧的宽度和高度。
frame.getViewTreeObserver().addOnGlobalLayoutListener(新ViewTreeObserver.OnGlobalLayoutListener()){
@凌驾
公共图书馆{
//设置全局变量
frameWidth=getView().getWidth();
frameHeight=getView().getHeight();
//Log.e(“Framewidth”,“Framewidth+Framewidth”);
Log.e(“帧高”、“帧高”);
}
});
//控制键盘拖动功能的ontouch侦听器。
setOnTouchListener(新的OnTouchListener(){
@凌驾
公共布尔onTouch(视图v,运动事件){
//获取用户触摸屏的x线和y线
final int X=(int)event.getRawX();
final int Y=(int)event.getRawY();
LayoutParams LayoutParams=(LayoutParams)imageView.getLayoutParams();
开关(event.getAction()&MotionEvent.ACTION\u掩码){
case MotionEvent.ACTION\u DOWN:
RelativeLayout.LayoutParams lParams=(RelativeLayout.LayoutParams)imageView.getLayoutParams();
_xDelta=X-lParams.leftMargin;
_yDelta=Y-lParams.topMargin;
打破
case MotionEvent.ACTION\u UP:
//无所事事
打破
case MotionEvent.ACTION\u指针\u向下:
//无所事事
打破
case MotionEvent.ACTION\u指针\u向上:
//无所事事
打破
case MotionEvent.ACTION\u移动:
layoutParams=(RelativeLayout.layoutParams)imageView.getLayoutParams();
Log.e(“Test”、“+imageView.getX()+”、“+imageView.getY());
layoutParams.leftMargin=X-xDelta;
layoutParams.topMargin=Y-_yDelta;
//阻止将图像的外边缘拖过
//框架外部边缘。
如果(((int)layoutParams.topMargin)>=1){
layoutParams.topMargin=0;
如果(((int)layoutParams.leftMargin)>=1){
layoutParams.leftMargin=0;
}else if(((int)layoutParams.leftMargin)