main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<org.lxh.demo.MyView
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
定义MyView类,用于图形的绘制:
package org.lxh.demo;
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.util.AttributeSet;
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.android_mldn);
Paint paint =new Paint();//为了增加一些文字的显示
paint.setAntiAlias(true);//消除锯齿
canvas.drawBitmap(bitmap, 0, 0, paint);
paint.setColor(Color.WHITE);
paint.setTextSize(15);
canvas.drawText("图片高度:"+bitmap.getHeight()+"图片宽度:"+bitmap.getWidth(), 10, bitmap.getHeight()+20, paint);
}
}