Android Paint和Color类绘画实例

要绘图，首先得调整画笔，待画笔调整好之后，再将图像绘制到画布上，这样才可以显示在手机屏幕上。Android 中的画笔是 Paint类，Paint 中包含了很多方法对其属性进行设置，主要方法如下：

setAntiAlias: 设置画笔的锯齿效果。 
   setColor: 设置画笔颜色 
   setARGB:  设置画笔的a,r,p,g值。 
   setAlpha:  设置Alpha值 
   setTextSize: 设置字体尺寸。 
   setStyle:  设置画笔风格，空心或者实心。 
   setStrokeWidth: 设置空心的边框宽度。 
   getColor:  得到画笔的颜色 
   getAlpha:  得到画笔的Alpha值

下面是一个简单的示例 来说明这些方法的使用。先来看看运行效果吧。

 package eoe.Demo;

 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 GameView extends View implements Runnable {

 public final static String TAG = "Example_05_03_GameView";
 // 声明Paint对象
 private Paint mPaint = null;

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

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

 @Override
 protected 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.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 颜色、Alpha值、外框的宽度、字体尺寸
 Log.i("TAG", "paint Color------>" + mPaint.getColor());
 Log.i(TAG, "paint Alpha------->" + mPaint.getAlpha());
 Log.i("TAG", "paint StrokeWidth--------->" + mPaint.getStrokeWidth());
 Log.i("TAG", "paint TextSize----------->" + mPaint.getTextSize());

 // 绘制一空心个矩形
 canvas.drawRect((320 - 80), 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 true;
 }

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

 @Override
 public void run() {
 while (!Thread.currentThread().isInterrupted()) {
 try {
 Thread.sleep(100);
 } catch (Exception e) {
 Thread.currentThread().interrupt();
 }
 // 更新界面
 postInvalidate();
 }
 }
 }

 package eoe.Demo;

 import android.app.Activity;
 import android.os.Bundle;

 public class Activity01 extends Activity {
 /** Called when the activity is first created. */
 private GameView mGameView;

 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);

 setContentView(R.layout.main);

 mGameView = new GameView(this);

 setContentView(mGameView);
 }
 }

（转：http://www.cnblogs.com/-OYK/archive/2011/10/25/2223624.html）