Android實(shí)現(xiàn)隨手指移動(dòng)小球

第Android實(shí)現(xiàn)隨手指移動(dòng)小球本文實(shí)例為大家分享了Android實(shí)現(xiàn)隨手指移動(dòng)小球的具體代碼，供大家參考，具體內(nèi)容如下

這個(gè)隨手指移動(dòng)小球，首先要使用paint畫筆在canvas畫布畫出一個(gè)圓，然后重寫OnTouchEvent(),進(jìn)行小球的坐標(biāo)的獲取和小球的重新繪畫。

packagecom.bwei.self_view;

importandroid.content.Context;

importandroid.graphics.Canvas;

importandroid.graphics.Color;

importandroid.graphics.Paint;

importandroid.support.annotation.Nullable;

importandroid.util.AttributeSet;

importandroid.view.MotionEvent;

importandroid.view.View;

importandroid.view.WindowManager;

*CreatedbyZhangTAOon2017/11/2.

publicclassMyViewextendsView{

//初始化圓的位置

publicintx=200;

publicinty=600;

Contextcontext;

publicMyView(Contextcontext){

super(context,null);

this.context=context;

publicMyView(Contextcontext,@NullableAttributeSetattrs){

super(context,attrs,0);

this.context=context;

publicMyView(Contextcontext,@NullableAttributeSetattrs,intdefStyleAttr){

super(context,attrs,defStyleAttr);

initView();

this.context=context;

privatevoidinitView(){

setBackgroundColor(Color.BLUE);

*@canvas畫布paint畫筆

@Override

protectedvoidonDraw(Canvascanvas){

super.onDraw(canvas);

//建立一根畫筆

Paintpaint=newPaint();

paint.setStyle(Paint.Style.FILL);

paint.setColor(Color.RED);

paint.setFakeBoldText(true);

//畫布

canvas.drawCircle(DipUtils.dip(getContext(),x),

DipUtils.dip(getContext(),y),

DipUtils.dip(getContext(),50),paint);

*進(jìn)行設(shè)置touch移動(dòng)

@Override

publicbooleanonTouchEvent(MotionEventevent){

super.onTouchEvent(event);

intaction=event.getAction();

switch(action){

caseMotionEvent.ACTION_DOWN:

caseMotionEvent.ACTION_MOVE:

caseMotionEvent.ACTION_UP:

//獲取當(dāng)前觸摸點(diǎn)的x,y坐標(biāo)

x=(int)event.getX();

y=(int)event.getY();

invalidate();

break;

//獲取屏幕的寬高

WindowManagermanger=(WindowManager)context.getSystemService(Context.WINDOW_SERVICE);

intwidth=manger.getDefaultDisplay().getWidth();

intheight=manger.getDefaultDisplay().getHeight();

//重新繪制圓，控制小球不會(huì)被移除屏幕

if(x=20y=20x=width-20yheight-20){

invalidate();

//自己處理觸摸事件

returntrue;

//修改當(dāng)前的坐標(biāo)

//this.x=(int)event.getX();

//this.y=(int)