Android中View跟随手指移动效果
最近做了一个项目中，其中遇到这样的需求要求图片移动到手指触碰的地方。具体实现代码如下所示：
packagecom.example.plane;
importAndroid.app.Activity;
importandroid.os.Bundle;
importandroid.util.DisplayMetrics;
importandroid.view.Display;
importandroid.view.KeyEvent;
importandroid.view.Menu;
importandroid.view.MenuItem;
importandroid.view.MotionEvent;
importandroid.view.View;
importandroid.view.View.OnKeyListener;
importandroid.view.View.OnTouchListener;
importandroid.view.Window;
importandroid.view.WindowManager;
publicclassMainActivityextendsActivity{
privateintspeed=10;
privateMyPlaneplane;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
plane=newMyPlane(this);
setContentView(plane);
//plane.setBackgroundResource(R.drawable.ic_launcher);
WindowManagermanager=getWindowManager();
Displaydisplay=manager.getDefaultDisplay();
DisplayMetricsmetrics=newDisplayMetrics();
display.getMetrics(metrics);
plane.currentX=metrics.widthPixels/2;
plane.currentY=metrics.heightPixels/2;
}
@Override
publicbooleanonTouchEvent(MotionEventevent){
/*floatx=0;
floaty=0;
switch(event.getAction()){
caseMotionEvent.ACTION_DOWN:
x=event.getX();
y=event.getY();
break;
caseMotionEvent.ACTION_MOVE:
x=event.getX();
y=event.getY();
break;
caseMotionEvent.ACTION_UP:
x=event.getX();
y=event.getY();
break;
}*/
plane.currentX=event.getX();
plane.currentY=event.getY();
plane.invalidate();
returnsuper.onTouchEvent(event);
}
}
packagecom.example.plane;
importandroid.content.Context;
importandroid.graphics.Bitmap;
importandroid.graphics.BitmapFactory;
importandroid.graphics.Canvas;
importandroid.graphics.Paint;
importandroid.view.View;
publicclassMyPlaneextendsView{
Bitmapplane;
publicfloatcurrentX;
publicfloatcurrentY;
publicMyPlane(Contextcontext){
super(context);
plane=BitmapFactory.decodeResource(context.getResources(),
R.drawable.ic_launcher);
setFocusable(true);
}
@Override
protectedvoidonDraw(Canvascanvas){
super.onDraw(canvas);
Paintp=newPaint();
canvas.drawBitmap(plane,currentX,currentY,p);
}
}
以上所述是小编给大家介绍的Android中View跟随手指移动效果，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对毛票票网站的支持！