Android学习笔记进阶17之LinearGradient

具体的看一下博文：Android学习笔记进阶15之Shader渲染

package xiaosi.BitmapShader;
import android.app.Activity;
import android.os.Bundle;
public class BitmapShaderActivity extends Activity {
/** Called when the activity is first created. */
private BitmapShaders bitmapShaders = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
bitmapShaders = new BitmapShaders(this);
setContentView(bitmapShaders);
}
}

BitmapShaders.Java

package xiaosi.BitmapShader;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ComposeShader;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.RadialGradient;
import android.graphics.Shader;
import android.graphics.SweepGradient;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.OvalShape;
import android.view.View;
public class BitmapShaders extends View
{
private LinearGradient linearGradient = null;
private ComposeShader composeShader = null;
private SweepGradient sweepGradient = null;
private RadialGradient radialGradient = null;
private BitmapShader bitmapShader = null;
private Bitmap bitmap = null;
private Paint paint = null;
private ShapeDrawable shapeDrawable = null;
private int BitmapWidth = 0;
private int BitmapHeight = 0;
public BitmapShaders(Context context)
{
super(context);
// 得到图像
bitmap = ((BitmapDrawable) getResources().getDrawable(R.drawable.v))
.getBitmap();
BitmapWidth = bitmap.getWidth();
BitmapHeight = bitmap.getHeight();
// 构造渲染器LinearGradient
linearGradient = new LinearGradient(0, 0, 100, 100, new int[] {
Color.RED, Color.GREEN, Color.BLUE, Color.WHITE }, null,
Shader.TileMode.REPEAT);
paint = new Paint();
}
@Override
protected void onDraw(Canvas canvas)
{
super.onDraw(canvas);
paint.setShader(linearGradient);
canvas.drawRect(20, 50, 320, 156, paint);
}
}

巴特西

Android学习笔记进阶17之LinearGradient

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