import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.Shader;
import android.view.View;/*** @version 2012-8-14 上午10:45:28**/
public class myGameView extends View implements Runnable {int bitwidth = 0;int bitheight = 0;Paint mPaint = null;// 线性渐变渲染Shader mLinearGradient1 = null;// 线性渐变渲染Shader mLinearGradient2 = null;// 线性渐变渲染Shader mLinearGradient3 = null;public myGameView(Context context) {super(context);// 创建LinearGradient并设置渐变颜色数组// 第一个,第二个參数表示渐变起点 能够设置起点终点在对角等任何位置// 第三个,第四个參数表示渐变终点// 第五个參数表示渐变颜色// 第六个參数能够为空,表示坐标,值为0-1 new float[] {0.25f, 0.5f, 0.75f, 1 }// 假设这是空的，颜色均匀分布，沿梯度线。// 第七个表示平铺方式// CLAMP反复最后一个颜色至最后// MIRROR反复着色的图像水平或垂直方向已镜像方式填充会有翻转效果// REPEAT反复着色的图像水平或垂直方向mLinearGradient1 = new LinearGradient(0, 0, 0, 100, new int[] {Color.RED, Color.GREEN, Color.BLUE, Color.WHITE }, null,Shader.TileMode.CLAMP);mLinearGradient2 = new LinearGradient(0, 0, 0, 100, new int[] {Color.RED, Color.GREEN, Color.BLUE, Color.WHITE }, null,Shader.TileMode.MIRROR);mLinearGradient3 = new LinearGradient(0, 0, 0, 100, new int[] {Color.RED, Color.GREEN, Color.BLUE, Color.WHITE }, null,Shader.TileMode.REPEAT);mPaint = new Paint();new Thread(this).start();}@Overrideprotected void onDraw(Canvas canvas) {// LinearGradient的高度仅仅有100而绘制的矩形有200所以才会有反复// 假设高度两者同样clamp反复是看不出效果的Paint paint = new Paint();paint.setTextSize(20);paint.setColor(Color.WHITE);// 绘制渐变的矩形mPaint.setShader(mLinearGradient1);canvas.drawRect(0, 0, 200, 200, mPaint);canvas.drawText("CLAMP", 0, 200 + 20, paint);// 绘制渐变的矩形mPaint.setShader(mLinearGradient2);canvas.drawRect(0, 250, 200, 450, mPaint);canvas.drawText("MIRROR", 0, 450 + 20, paint);// 绘制渐变的矩形mPaint.setShader(mLinearGradient3);canvas.drawRect(0, 500, 200, 700, mPaint);canvas.drawText("REPEAT", 0, 700 + 20, paint);}@Overridepublic void run() {while(!Thread.currentThread().isInterrupted()) {try {Thread.sleep(100);}catch(Exception e) {Thread.currentThread().interrupt();}postInvalidate();}}
}

效果图