Android编程实现图标拖动效果的方法
本文实例讲述了Android编程实现图标拖动效果的方法。分享给大家供大家参考，具体如下：
最近优化图标拖动时的速率，稍微有一点点效果，直接把代码贴出来，有兴趣一起讨论的朋友可以给我留言。
代码如下:
DragView.java
packagecom.android.dragtest;
importandroid.content.Context;
importandroid.util.AttributeSet;
importandroid.util.Log;
importandroid.view.MotionEvent;
importandroid.view.View;
importandroid.widget.FrameLayout;
publicclassDragViewextendsFrameLayout{
privatestaticfinalStringTAG="DragView";
privatefloatX;
privatefloatY;
privateViewmDragView;
publicDragView(Contextcontext){
this(context,null);
}
publicDragView(Contextcontext,AttributeSetattrs){
this(context,attrs,0);
}
publicDragView(Contextcontext,AttributeSetattrs,intdefStyle){
super(context,attrs,defStyle);
mDragView=newView(context);
mDragView.setLayoutParams(newLayoutParams(60,60));
mDragView.setBackgroundDrawable(getResources().getDrawable(R.drawable.gamecenter));
mDragView.setVisibility(View.INVISIBLE);
addView(mDragView);
}
publicbooleanonInterceptTouchEvent(MotionEventev){
finalintaction=ev.getAction();
switch(action){
caseMotionEvent.ACTION_DOWN:
Log.d(TAG,"===============>onInterceptTouchEventACTION_DOWN");
break;
caseMotionEvent.ACTION_MOVE:
Log.d(TAG,"===============>onInterceptTouchEventACTION_MOVE");
break;
caseMotionEvent.ACTION_UP:
Log.d(TAG,"===============>onInterceptTouchEventACTION_UP");
break;
}
returntrue;
}
publicbooleanonTouchEvent(MotionEventev){
finalintaction=ev.getAction();
X=ev.getX();
Y=ev.getY();
switch(action){
caseMotionEvent.ACTION_DOWN:
Log.d(TAG,"onTouchEventACTION_DOWN");
mDragView.layout((int)X-30,(int)Y-30,(int)X+30,(int)Y+30);
mDragView.setVisibility(View.VISIBLE);
break;
caseMotionEvent.ACTION_MOVE:
Log.d(TAG,"onTouchEventACTION_MOVEx:"+X+"Y:"+Y);
mDragView.layout((int)X-30,(int)Y-30,(int)X+30,(int)Y+30);
break;
caseMotionEvent.ACTION_UP:
Log.d(TAG,"onTouchEventACTION_UP");
mDragView.setVisibility(View.INVISIBLE);
break;
}
returntrue;
}
}
DragTestActivity.java
packagecom.android.dragtest;
importandroid.app.Activity;
importandroid.os.Bundle;
publicclassDragTestActivityextendsActivity{
/**Calledwhentheactivityisfirstcreated.*/
@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
main.xml
<?xmlversion="1.0"encoding="utf-8"?> <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical"> <com.android.dragtest.DragView android:layout_width="match_parent" android:layout_height="match_parent"> </com.android.dragtest.DragView> </LinearLayout>
希望本文所述对大家Android程序设计有所帮助。