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