水波纹效果---3环波纹

标签：android   水波纹效果   

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Bitmap.Config;
import android.os.Handler;
import android.os.Message;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

/**
 * 水波纹View
 * @author alan
 *
 */
public class WaterView extends View{
	
	/**
	 * 不透明度（完全透明：0）
	 */
	private int radius1;
	private int radius2;
	private int radius3;
	
	private int alpha1;
	private int alpha2;
	private int alpha3;
	
	private Paint paint1;
	private Paint paint2;
	private Paint paint3;
	
	private int widthScreen;
	private int heightScreen;
	
	private Handler mHandler;
	/**
	 * 图片直径
	 */
	private  static final int MIN = 50; 
	
	public WaterView(Context context,Bitmap source) {
		super(context);
		init();
		
		//获取屏幕的宽高
		DisplayMetrics dm = getResources().getDisplayMetrics();
		widthScreen = dm.widthPixels;
		heightScreen = dm.heightPixels;
		
		mHandler = new Handler(){
			@Override
			public void handleMessage(Message msg) {
				super.handleMessage(msg);
				switch (msg.what) {
				case 0:
					flushState();
					WaterView.this.invalidate();
					if(alpha1 ==0 ||alpha2 ==0 ||alpha3 ==0){
						Log.i("TAG", "alpha1-->"+alpha1+"alpha2-->"+alpha2+"alpha3-->"+alpha3);
						mHandler.sendEmptyMessage(1);
					}else{
						mHandler.sendEmptyMessageDelayed(0, 50);
					}
					
					break;

				case 1:
					initSimple();
					WaterView.this.invalidate();
					mHandler.sendEmptyMessage(0);
					
					break;
				
				default:
					break;
				}
			}
		};
		
		mHandler.sendEmptyMessage(0);
	}
	
	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		// TODO Auto-generated method stub
		super.onMeasure(widthMeasureSpec, heightMeasureSpec);
	}
	
	
	
	@Override
	protected void onDraw(Canvas canvas) {
		Log.i("TAG", "onDraw......");
		super.onDraw(canvas);		
		//画圆
		//c1（最小圆）
		canvas.drawCircle(widthScreen/2, this.getHeight()/2, radius1, paint1);
		//c2
		canvas.drawCircle(widthScreen/2, this.getHeight()/2, radius2, paint2);
		//c3
		canvas.drawCircle(widthScreen/2, this.getHeight()/2, radius3, paint3);
		
		
		
	}
	
	
	private void init() {
		
		alpha1 = 255;
		radius1 = MIN / 2;
		
		alpha2= 175;
		radius2 = MIN / 2 + 80;
		
		alpha3 = 95;
		radius3 = MIN / 2 + 160;
		
		
		initPaint();		
		
	}
	
	private void initSimple(){
		if(alpha1 == 0 ){
			alpha1 = 255;
			radius1 = MIN / 2;
			paint1.setColor(Color.BLUE);
		}
		if(alpha2 == 0 ){
			alpha2 = 255;
			radius2 = MIN / 2;
			paint2.setColor(Color.BLUE);
		}
		if(alpha3 == 0 ){
			alpha3 = 255;
			radius3 = MIN / 2;
			paint3.setColor(Color.BLUE);
		}
		paint1.setAlpha(alpha1);
		paint2.setAlpha(alpha2);
		paint3.setAlpha(alpha3);
		
	}
	
	private void flushState() {
		radius1  +=5;
		alpha1  -=5;//控制速度，值越大，圆环扩大越快
		
		radius2  +=5;
		alpha2  -=5;
		
		radius3  +=5;
		alpha3  -=5;
		
		if(alpha1 <= 0){
			
			alpha1 = 0 ;
		}
		
		if (alpha2 <= 0) {

			alpha2 = 0;
		}
		if (alpha3 <= 0) {

			alpha3 = 0;
		}
		paint1.setAlpha(alpha1);
		paint2.setAlpha(alpha2);
		paint3.setAlpha(alpha3);

	}
	
	
	private void initPaint() {
		//新建一个画笔
		paint1 = new Paint();
		paint1.setAntiAlias(true);//设置抗锯齿
		paint1.setStrokeWidth((float) 1);//设置线宽1
		paint1.setStyle(Paint.Style.STROKE);//设置空心画笔，环形方式绘制
		
		paint1.setAlpha(alpha1);
		paint1.setColor(Color.BLUE);
		
		//定义画笔2
		paint2 = new Paint();
		paint2.setAntiAlias(true);//设置抗锯齿
		paint2.setStrokeWidth((float) 1);//设置线宽1
		paint2.setStyle(Paint.Style.STROKE);//设置空心画笔，环形方式绘制
		paint2.setAlpha(alpha2);
		
		//定义画笔3
		paint3 = new Paint();
		paint3.setAntiAlias(true);//设置抗锯齿
		paint3.setStrokeWidth((float) 1);//设置线宽1
		paint3.setStyle(Paint.Style.STROKE);//设置空心画笔，环形方式绘制
		paint3.setAlpha(alpha3);
	}
	
	

	

}

水波纹效果---3环波纹

标签：android   水波纹效果   

原文地址：http://blog.csdn.net/u013372185/article/details/41806059