Android 自定義View需要重寫ondraw()等方法

Android 自定義View需要重寫ondraw()等方法，這篇博客給大家說說自定義View的寫法，需要我們繼承View，然後重寫一些

方法，方法多多，看你需要什麼方法

首先寫一個自定義的View 繼承View

package com.example.engineerjspview;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.MotionEvent;
/**
 * 自定義 EngineerJspView
 * @author Engineer-Jsp
 * @date 2014.10.28
 * */
import android.view.View;
public class EngineerJspView extends View{
	public float E_X = 188;  
    public float E_Y = 188;  
    Paint paint = new Paint(); 

	public EngineerJspView(Context context) {
		super(context);
	}
	public EngineerJspView(Context context, AttributeSet set){
		super(context, set); 
	}
	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		paint.setColor(Color.RED);  
        canvas.drawCircle(E_X, E_Y, 88, paint);
	}
	@Override
	public boolean onTouchEvent(MotionEvent event) {
		 E_X = event.getX();  
	     E_X = event.getY();  
	        invalidate();
		return false;
	}
	@Override
	protected void onAnimationStart() {
		super.onAnimationStart();
	}
	@Override
	protected void onAnimationEnd() {
		super.onAnimationEnd();
	}

}

package com.example.engineerjspview;
/**
 * 自定義 EngineerJspView
 * @author Engineer-Jsp
 * @date 2014.10.28 
 * */
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}

}

自定義View看你需求而定，並不只是畫圖形而已，我這裡只是說明下自定義View需要重寫的方法~~