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我有一个大于显示容器的图像。图像在容器内可拖动,目前它可以在容器中的任何位置拖动。我想停止图像的顶部与容器顶部匹配时被拖动。在拖动ImageView时侦听容器边缘
我的代码:
@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>
我想阻止正在进一步拖累比例如容器的图像的顶部边框的图片应不超过布局容器的顶部被拖进。