简单自定义View

简单的自定义View下，参考李刚疯狂Andriod

package com.utils.MyDemo;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;

import android.util.AttributeSet;
import android.view.View;

public class MyView extends View {
	public float currentX=40;
	public float currentY=40;

	public MyView(Context context) {
		super(context);
	}

	public MyView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		// TODO Auto-generated constructor stub
	}

	public MyView(Context context, AttributeSet attrs) {
		super(context, attrs);
		// TODO Auto-generated constructor stub
	}

	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		Paint paint=new Paint();
		paint.setColor(Color.GREEN);
		canvas.drawCircle(currentX, currentX, 15, paint);

	}

}

主要需要重新父类构造方法，几个方法切记不要删除。

在XML引用如下：

<?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"
    >
    <com.utils.MyDemo.MyView
      android:id="@+id/myView"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
    />

</LinearLayout>

主要是全称，包名+类名

在Activity中修改

public class MainActivity extends Activity {
    /** Called when the activity is first created. */

	private MyView myView=null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        myView=(MyView)this.findViewById(R.id.myView);
        myView.setMinimumHeight(500);
        myView.setMinimumWidth(300);
        myView.setOnTouchListener(new View.OnTouchListener() {

		public boolean onTouch(View arg0, MotionEvent event) {
				myView.currentX=event.getX();
				myView.currentY=event.getY();
				myView.invalidate();
				return true;
			}
		});
    }
}

以上自定义MyView 主要完成了，随鼠标点击移动事件，MyView 为圆形随之运动。