1、MainActivity
package com.njupt.shudhu02;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new MyView(this));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
2、MyView
package com.njupt.shudhu02;
import android.content.Context;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.view.View;
public class MyView extends View{
public MyView(Context context) {
super(context);
}
@Override
protected void onDraw(Canvas canvas) {
Paint paint = new Paint();
paint.setARGB(150, 0, 100, 200);
// paint.setStyle(Paint.Style.STROKE);//这时候画笔画出来的东西都是空心的
paint.setStrokeWidth(10);
paint.setTextSize(100);//
/**
* canvas.drawRect(100, 300,300,500,paint)
* 该函数的4个参数分别为距离左边的距离,上,右,下
*/
// canvas.drawRect(100, 300,300,500,paint);//画矩形
/**
* 前3个参数的意思是:前两个是圆心的坐标,第三个是半径...
*/
// canvas.drawCircle(200, 200, 150, paint);//画圆形
/**
* canvas.drawText("apple", 50, 200, paint)
* 这四个参数分别为:要绘制的文本,X轴的坐标,基准线,所使用的画笔
*/
// canvas.drawText("apple", 50, 200, paint);//绘制文本
/**
* canvas.drawBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher), 100,300, paint)
* 前四个参数为:要显示的图形,图片左边界,图片的上边界,所使用的画笔
*
*/
canvas.drawBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher), 100,300, paint);//绘制图形
super.onDraw(canvas);
}
}