android之【LinearLayout自定义View】

<pre name="code" class="plain"><pre name="code" class="html">main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"android:id="@+id/root"></LinearLayout>

@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main);//获取布局文件中的LinearLayout容器LinearLayout root = (LinearLayout)findViewById(R.id.root);//创建自定义的DrawView组件final DrawView draw = new DrawView(this);//设置自定义组件的最大宽度、高度draw.setMinimumWidth(300); draw.setMinimumHeight(500); //为draw组件绑定Touch事件draw.setOnTouchListener(new OnTouchListener(){@Overridepublic boolean onTouch(View arg0, MotionEvent event){//修改draw组件的currentX、currentY两个属性draw.currentX = event.getX();draw.currentY = event.getY();//通知draw组件重绘draw.invalidate();//返回true表明处理方法已经处理该事件return true;}});root.addView(draw);}

DrawView

public class DrawView extends View{public float currentX = 40;public float currentY = 50;/** * @param context */public DrawView(Context context){super(context);// TODO Auto-generated constructor stub}@Overridepublic void onDraw (Canvas canvas){super.onDraw(canvas);//创建画笔Paint p = new Paint();//设置画笔的颜色p.setColor(Color.RED);//绘制一个小圆（作为小球）canvas.drawCircle(currentX , currentY , 15 , p);}}

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