本文主要是介绍Android学习笔记进阶17之LinearGradient，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
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;@Overridepublic 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LinearGradientlinearGradient = new LinearGradient(0, 0, 100, 100, new int[] {Color.RED, Color.GREEN, Color.BLUE, Color.WHITE }, null,Shader.TileMode.REPEAT);paint = new Paint();}@Overrideprotected void onDraw(Canvas canvas){super.onDraw(canvas);paint.setShader(linearGradient);canvas.drawRect(20, 50, 320, 156, paint);}
}
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