学步园

准备一张名为picture的图片。

在main.xml中：

<LinearLayout

    xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:background="#000000">

  <com.li.bitmap.MyView

      android:layout_width="fill_parent"

      android:layout_height="wrap_content"/>

</LinearLayout>

在MyBitmapDemo.java中：

package com.li.bitmap;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.MenuItem;

import android.support.v4.app.NavUtils;

public class MyBitmapDemo extends Activity {

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

    }

}

在MyView.java中：

package com.li.bitmap;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Rect;

import android.util.AttributeSet;

import android.util.DisplayMetrics;

import android.view.View;

public class MyView extends View {

  public MyView(Context context, AttributeSet attrs) {

     super(context, attrs);

  }

  @Override

  protected void onDraw(Canvas canvas) {

     Bitmap bitmap = BitmapFactory.decodeResource(super.getResources(),

         R.drawable.picture); // 找到图片的Bitmap对象

     Paint paint = new Paint() ;

     paint.setAntiAlias(true); // 消除锯齿

     canvas.drawBitmap(bitmap, null, new Rect

       (40,50,260,300),paint);   //开辟矩形让图片进行填充

  }

}