paintview.java

Android游戏开发入门

package com.bgstudy.app.game.paint;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.Log;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;

public class PaintView extends View implements Runnable
{

	public final static String	TAG		= "[PaintView]";	// 
	/* 声明Paint对象 */
	private Paint				mPaint	= null;


	public PaintView(Context context)
	{
		super(context);
		/* 构建对象 */
		mPaint = new Paint();

		/* 开启线程 */
		new Thread(this).start();
	}


	public void onDraw(Canvas canvas)
	{
		super.onDraw(canvas);

		/* 设置Paint为无锯齿 */
		mPaint.setAntiAlias(true);

		/* 设置Paint的颜色 */
		mPaint.setColor(Color.RED);
		mPaint.setColor(Color.BLUE);
		mPaint.setColor(Color.YELLOW);
		mPaint.setColor(Color.GREEN);
		/* 同样是设置颜色 */
		mPaint.setColor(Color.rgb(255, 0, 0));

		/* 提取颜色 */
		Color.red(0xcccccc);
		Color.green(0xcccccc);

		/* 设置paint的颜色和Alpha值(a,r,g,b) */
		mPaint.setARGB(255, 255, 0, 0);

		/* 设置paint的Alpha值 */
		mPaint.setAlpha(220);

		/* 这里可以设置为另外一个paint对象 */
		// mPaint.set(new Paint());
		/* 设置字体的尺寸 */
		mPaint.setTextSize(14);

		// 设置paint的风格为“空心”.
		// 当然也可以设置为“实心”(Paint.Style.FILL)
		mPaint.setStyle(Paint.Style.STROKE);

		// 设置“空心”的外框的宽度。
		mPaint.setStrokeWidth(5);

		/* 得到Paint的一些属性 */
		Log.i(TAG, "paint的颜色：" + mPaint.getColor());

		Log.i(TAG, "paint的Alpha：" + mPaint.getAlpha());

		Log.i(TAG, "paint的外框的宽度：" + mPaint.getStrokeWidth());

		Log.i(TAG, "paint的字体尺寸：" + mPaint.getTextSize());

		/* 绘制一个矩形 */
		// 肯定是一个空心的举行
		canvas.drawRect((320 - 80) / 2, 20, (320 - 80) / 2 + 80, 20 + 40, mPaint);

		/* 设置风格为实心 */
		mPaint.setStyle(Paint.Style.FILL);

		mPaint.setColor(Color.GREEN);

		/* 绘制绿色实心矩形 */
		canvas.drawRect(0, 20, 40, 20 + 40, mPaint);
	}


	// 触笔事件
	public boolean onTouchEvent(MotionEvent event)
	{
		return true;
	}


	// 按键按下事件
	public boolean onKeyDown(int keyCode, KeyEvent event)
	{
		return true;
	}


	// 按键弹起事件
	public boolean onKeyUp(int keyCode, KeyEvent event)
	{
		return false;
	}


	public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event)
	{
		return true;
	}


	public void run()
	{
		while (!Thread.currentThread().isInterrupted())
		{
			try
			{
				Thread.sleep(100);
			}
			catch (InterruptedException e)
			{
				Thread.currentThread().interrupt();
			}
			// 使用postInvalidate可以直接在线程中更新界面
			postInvalidate();
		}
	}
}