1 package com.example.user_defined_view;
 2 
 3 import android.annotation.SuppressLint;
 4 import android.content.Context;
 5 import android.graphics.Bitmap;
 6 import android.graphics.BitmapFactory;
 7 import android.graphics.Canvas;
 8 import android.graphics.Color;
 9 import android.graphics.Paint;
10 import android.graphics.Rect;
11 import android.util.AttributeSet;
12 import android.view.View;
13 
14 @SuppressLint("DrawAllocation")
15 public class Bitmap_View extends View {
16 
17     public Bitm






 


ap_View(Context context, AttributeSet attrs) {
18         super(context, attrs);
19     }
20     @SuppressLint("DrawAllocation")
21     @Override
22     protected void onDraw(Canvas canvas) {
23         Bitmap bitmap = BitmapFactory.decodeResource(super.getResources(),
24                 R.drawable.ic_launcher);// 找到bitmap对象
25         Paint paint = new Paint();
26         paint.setAntiAlias(true);// 消除龋齿
27         canvas.drawBitmap(bitmap, new Rect(30, 50, 200, 200), new Rect(30, 50, 200, 200), paint);
28         
29         
30     }
31 
32 }




 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     tools:context=".MainActivity" >
 6 
 7     <com.example.user_defined_view.Bitmap_View
 8         android:layout_width="fill_parent"
 9         android:layout_height="wrap_content" />
10 
11 </RelativeLayout>