Android实现自定义view---绘制图片

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

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