绘图

转载请注明出处

1.Paint的设置方法

2.使用Canvas绘制点、线和图形

3.使用Canvas绘制文字

4.使用Canvas绘制图片的方法

import android.R.color;
import android.content.Context;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.View;

public class MyView extends View {

	public MyView(Context context) {
		super(context);
		// TODO Auto-generated constructor stub
	}
//当Android系统需要绘制一个View对象时，就会调用该对象的onDraw
	@Override
	protected void onDraw(Canvas canvas) {
		
		Paint paint = new Paint();
		paint.setARGB(150, 0, 100, 200);
		//设置空心
		paint.setStyle(Paint.Style.STROKE);
		paint.setStrokeWidth(10);
		paint.setTextSize(100);
		//Y坐标表示字符的基准线的位置
		canvas.drawText("apple", 0, 200, paint);
		canvas.drawLine(0, 200, 500, 200, paint);
		//绘制矩形
		canvas.drawRect(100, 300, 300, 500, paint);
		canvas.drawCircle(200, 200, 150, paint);
		//使用Canvas绘制图形
		canvas.drawBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher), 100, 500, paint);
		super.onDraw(canvas);
	}

	
}

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		//setContentView(R.layout.activity_main);
		setContentView(new MyView(this));
	}


}