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();

    }

    @Override

    protected 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);

    }

    @Override

    public void run() {

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

            try {

                Thread.sleep(100);

            }

            catch(Exception e) {

                Thread.currentThread().interrupt();

            }

            postInvalidate();

        }

    }

}

效果图