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）