Android实现自定义view-绘制图片

文章来源：http://www.itnose.net/detail/6034929.html
更多文章：http://www.itnose.net/type/85.html

主要原理是：extends view重载onDrow(),需要一bitmap，重载view，在 canvas上画临时bmp，当按下确定的时候按下 

   画到real_bmp上,其他的跟前面的基本上没有什么区别。

 

   

import com.example.test.R;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.os.Bundle;
import android.provider.ContactsContract.CommonDataKinds.Event;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;

public class bmpeffect extends Activity{
	 /*
	   * 需要一bitmap，重载view，在 canvas上画临时bmp，当按下确定的时候按下
	   * 画到real_bmp上,其他的跟前面的基本上没有什么区别
	   */
	private static Bitmap src;
	private static Bitmap heart;
	private static Bitmap star;
	private static Bitmap star2;
	private static int choose;
	private int height;
	private int width;
	public static float bmp_x;
    public static  float bmp_y;
	private Canvas my_canvas;
	public void onCreate(Bundle save){
		Log.e("on create", "hello");
	  super.onCreate(save);
	  src=data.src_bmp;
	  if(data.src_bmp==null)
		  Log.e("bmp", "null");
	  my_canvas=new Canvas(data.src_bmp);
	  height=data.src_bmp.getHeight();
	  width=data.src_bmp.getWidth();
	 heart=data.getbmp(getResources(), R.drawable.small_heart);
	 star=data.getbmp(getResources(), R.drawable.small_star);
	 star2=data.getbmp(getResources(), R.drawable.star8);
	  choose=0;
	  setContentView(R.layout.bmptest);
  }
  public void on_star2(final View v){
	  //star8;
	  choose=3;
	  
  }
  public void on_star(final View v){
	  choose=2;
  }
  public void on_heart(final View v){
	  choose=1;
  }
  public void on_ok(final View v){
	 drow_bmp(my_canvas);
  }
  public static void drow_bmp(Canvas canvas){
	  switch(choose){
	  case 1:
		  canvas.drawBitmap(heart, bmp_x, bmp_y, null);
		  break;
	  case 2:
		  canvas.drawBitmap(star, bmp_x,bmp_y, null);
		  break;
	  case 3:
		  //canvas.drawBitmap(star2, matrix, paint)
		  canvas.drawBitmap(star2, bmp_x, bmp_y, null);
	  }
  }
  public static class bmpview extends View{

	public bmpview(Context context,AttributeSet attrs) {
		super(context,attrs);
		// TODO Auto-generated constructor stub
	}
	 protected void onDraw(Canvas canvas){
		 canvas.drawColor(0xff000000);
		 Log.i("canvas", "drow");
		 if(src!=null){
			 canvas.drawBitmap(src, 0, 0, null);
		 }
		 drow_bmp(canvas);
	 }
	 public boolean onTouchEvent(MotionEvent event){
		 int action=event.getAction();
		 //现在应该可以不用区分不同的手势事件了，只需要得到
		 bmp_x=event.getX();
		 bmp_y=event.getY();
		 invalidate();
		 return true;
	 }
  }
 
}

效果如下