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。

  1 package eoe.Demo;

  2 

  3 import android.content.Context;

  4 import android.graphics.Canvas;

  5 import android.graphics.Color;

  6 import android.graphics.Paint;

  7 import android.util.Log;

  8 import android.view.KeyEvent;

  9 import android.view.MotionEvent;

 10 import android.view.View;

 11 

 12 public class GameView extends View implements Runnable {

 13 

 14 public final static String TAG = "Example_05_03_GameView";

 15 // 声明Paint对象

 16 private Paint mPaint = null;

 17 

 18 public GameView(Context context) {

 19 super(context);

 20 // 构建对象

 21 mPaint = new Paint();

 22 

 23 // 开启线程

 24 new Thread(this).start();

 25 }

 26 

 27 @Override

 28 protected void onDraw(Canvas canvas) {

 29 super.onDraw(canvas);

 30 

 31 // 设置Paint为无锯齿

 32 mPaint.setAntiAlias(true);

 33 

 34 // 设置Paint的颜色

 35 mPaint.setColor(Color.RED);

 36 mPaint.setColor(Color.BLUE);

 37 mPaint.setColor(Color.YELLOW);

 38 mPaint.setColor(Color.GREEN);

 39 // 同样是设置颜色

 40 mPaint.setColor(Color.rgb(255, 0, 0));

 41 

 42 // 提取颜色

 43 Color.red(0xcccccc);

 44 Color.green(0xcccccc);

 45 

 46 // 设置paint的颜色和Alpha值(a,r,g,b)

 47 mPaint.setAlpha(220);

 48 

 49 // 这里可以设置为另外一个paint对象

 50 // mPaint.set(new Paint());

 51 // 设置字体的尺寸

 52 mPaint.setTextSize(14);

 53 

 54 // 设置paint的风格为“空心”

 55 // 当然也可以设置为"实心"(Paint.Style.FILL)

 56 mPaint.setStyle(Paint.Style.STROKE);

 57 

 58 // 设置“空心”的外框的宽度

 59 mPaint.setStrokeWidth(5);

 60 

 61 // 得到Paint的一些属性 颜色、Alpha值、外框的宽度、字体尺寸

 62 Log.i("TAG", "paint Color------>" + mPaint.getColor());

 63 Log.i(TAG, "paint Alpha------->" + mPaint.getAlpha());

 64 Log.i("TAG", "paint StrokeWidth--------->" + mPaint.getStrokeWidth());

 65 Log.i("TAG", "paint TextSize----------->" + mPaint.getTextSize());

 66 

 67 // 绘制一空心个矩形

 68 canvas.drawRect((320 - 80), 20, (320 - 80) / 2 + 80, 20 + 40, mPaint);

 69 

 70 // 设置风格为实心

 71 mPaint.setStyle(Paint.Style.FILL);

 72 

 73 mPaint.setColor(Color.GREEN);

 74 

 75 // 绘制绿色实心矩形

 76 canvas.drawRect(0, 20, 40, 20 + 40, mPaint);

 77 }

 78 

 79 // 触笔事件

 80 public boolean onTouchEvent(MotionEvent event) {

 81 return true;

 82 }

 83 

 84 // 按键按下事件

 85 public boolean onKeyDown(int keyCode, KeyEvent event) {

 86 return true;

 87 }

 88 

 89 // 按键弹起事件

 90 public boolean onKeyUp(int keyCode, KeyEvent event) {

 91 return true;

 92 }

 93 

 94 public boolean onKeyMultiple(int KeyCode, int repeatCount, KeyEvent event) {

 95 return true;

 96 }

 97 

 98 @Override

 99 public void run() {

100 while (!Thread.currentThread().isInterrupted()) {

101 try {

102 Thread.sleep(100);

103 } catch (Exception e) {

104 Thread.currentThread().interrupt();

105 }

106 // 更新界面

107 postInvalidate();

108 }

109 }

110 }

111 

112 

113 package eoe.Demo;

114 

115 import android.app.Activity;

116 import android.os.Bundle;

117 

118 public class Activity01 extends Activity {

119 /** Called when the activity is first created. */

120 private GameView mGameView;

121 

122 @Override

123 public void onCreate(Bundle savedInstanceState) {

124 super.onCreate(savedInstanceState);

125 

126 setContentView(R.layout.main);

127 

128 mGameView = new GameView(this);

129 

130 setContentView(mGameView);

131 }

132 }

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