Android 自定义LineLayout实现满屏任意拖动功能的示例代码
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2023-12-30 18:34:10
1.前言在开发中,会有需求实现控件在屏幕随意拖动,这就需要自定义view,然后在ontouchevent事件中,处理motionevent.action_move事件,然后通过坐标点传值给onlayo...
1.前言
在开发中,会有需求实现控件在屏幕随意拖动,这就需要自定义view,然后在ontouchevent事件中,处理motionevent.action_move事件,然后通过坐标点传值给onlayout方法,来实现控件的任意拖动,具体代码如下:
import android.content.context; import android.util.attributeset; import android.view.display; import android.view.motionevent; import android.view.windowmanager; import android.widget.linearlayout; public class draglinelayout extends linearlayout { private int mwidth; private int mheight; private int mscreenwidth; private int mscreenheight; private context mcontext; private onlocationlistener mlocationlistener;/*listen to the rect */ //是否拖动 private boolean isdrag = false; public boolean isdrag() { return isdrag; } public dragview(context context, attributeset attrs) { super(context, attrs); this.mcontext = context; } @override protected void onmeasure(int widthmeasurespec, int heightmeasurespec) { super.onmeasure(widthmeasurespec, heightmeasurespec); mwidth = getmeasuredwidth(); mheight = getmeasuredheight(); mscreenwidth = getscreenwidth(mcontext); mscreenheight = getscreenheight(mcontext) - getstatusbarheight(); } public int getstatusbarheight() { int resourceid = mcontext.getresources().getidentifier("status_bar_height", "dimen", "android"); return mcontext.getresources().getdimensionpixelsize(resourceid); } public int getscreenwidth(context context) { windowmanager manager = (windowmanager) context .getsystemservice(context.window_service); display display = manager.getdefaultdisplay(); return display.getwidth(); } public int getscreenheight(context context) { windowmanager manager = (windowmanager) context .getsystemservice(context.window_service); display display = manager.getdefaultdisplay(); return display.getheight(); } private float mdownx; private float mdowny; @override public boolean ontouchevent(motionevent event) { super.ontouchevent(event); if (this.isenabled()) { switch (event.getaction()) { case motionevent.action_down: isdrag = false; mdownx = event.getx(); mdowny = event.gety(); break; case motionevent.action_move: final float mxdistance = event.getx() - mdownx; final float mydistance = event.gety() - mdowny; int l, r, t, b; //当水平或者垂直滑动距离大于10,才算是拖动事件 if (math.abs(mxdistance) > 10 || math.abs(mydistance) > 10) { isdrag = true; l = (int) (getleft() + mxdistance); r = l + mwidth; t = (int) (gettop() + mydistance); b = t + mheight; //边界判断,不让布局滑出界面 if (l < 0) { l = 0; r = l + mwidth; } else if (r > mscreenwidth) { r = mscreenwidth; l = r - mwidth; } if (t < 0) { t = 0; b = t + mheight; } else if (b > mscreenheight) { b = mscreenheight; t = b - mheight; } //回调移动后的坐标点 if(mlocationlistener!=null){ mlocationlistener.locationrect((l+r)/2,(t+b)/2); } this.layout(l, t, r, b); } break; case motionevent.action_up: setpressed(false); break; case motionevent.action_cancel: setpressed(false); break; } return true; } return false; } public void setlocationlistener(onlocationlistener locationlistener) { this.mlocationlistener = locationlistener; } public interface onlocationlistener { void locationrect(float locationx, float locationy); } }
2.在代码中的运用
<com.xinrui.guestservice.view.draglinelayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="@dimen/dp_200" android:layout_height="@dimen/dp_110" android:orientation="vertical"> <relativelayout android:layout_width="match_parent" android:layout_height="@dimen/dp_50"> <edittext android:id="@+id/input_edt" android:layout_width="match_parent" android:layout_height="@dimen/dp_50" android:background="@drawable/edit_bg" /> </relativelayout> <relativelayout android:layout_width="match_parent" android:layout_height="@dimen/dp_55" android:layout_margintop="@dimen/margin_5" android:background="@drawable/paint_bg"> <textview android:id="@+id/paint_typeface" android:layout_width="@dimen/dp_50" android:layout_height="@dimen/dp_50" android:layout_alignparentleft="true" android:layout_alignparenttop="true" android:layout_margintop="@dimen/margin_5" android:background="@drawable/main_selector_write" android:clickable="true" /> <textview android:id="@+id/paint_fontsize" android:layout_width="@dimen/dp_50" android:layout_height="@dimen/dp_50" android:layout_alignparenttop="true" android:layout_marginleft="@dimen/dp_10" android:layout_margintop="@dimen/margin_5" android:layout_torightof="@id/paint_typeface" android:background="@drawable/main_selector_write" android:clickable="true" /> </relativelayout> </com.xinrui.guestservice.view.draglinelayout>
3.这样就可以在activity 加载这个xml 来实现任意拖动功能
总结
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