Android实战简易教程（Ripple Effect-为控件增加涟漪效果）

最近发现了一款可以为控件增加涟漪效果的github项目，可以提升应用的逼格啊，大家不妨引入到自己的项目中。该项目本身是android studio下面编译，我改成了eclipse下可以运行的项目，下面我们来看一下具体的用法吧！

1.RippleView.java:

 /*
  * The MIT License (MIT)
  *
  * Copyright (c) 2014 Robin Chutaux
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */

 package com.example.rippleeffectview;

 import com.example.test.R;

 import android.content.Context;
 import android.content.res.TypedArray;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.Paint;
 import android.graphics.PorterDuff;
 import android.graphics.PorterDuffXfermode;
 import android.graphics.Rect;
 import android.os.Handler;
 import android.util.AttributeSet;
 import android.view.GestureDetector;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.animation.Animation;
 import android.view.animation.ScaleAnimation;
 import android.widget.RelativeLayout;

 /**
  *
  * Date :      10/8/2014
  */
 public class RippleView extends RelativeLayout
 {
     private int WIDTH;
     private int HEIGHT;
     private int FRAME_RATE = 10;
     private int DURATION = 400;
     private int PAINT_ALPHA = 90;
     private Handler canvasHandler;
     private float radiusMax = 0;
     private boolean animationRunning = false;
     private int timer = 0;
     private int timerEmpty = 0;
     private int durationEmpty = -1;
     private float x = -1;
     private float y = -1;
     private int zoomDuration;
     private float zoomScale;
     private ScaleAnimation scaleAnimation;
     private Boolean hasToZoom;
     private Boolean isCentered;
     private Integer rippleType;
     private Paint paint;
     private Bitmap originBitmap;
     private int rippleColor;
     private View childView;
     private int ripplePadding;
     private GestureDetector gestureDetector;
     private Runnable runnable = new Runnable()
     {
         @Override
         public void run()
         {
             invalidate();
         }
     };

     public RippleView(Context context)
     {
         super(context);
     }

     public RippleView(Context context, AttributeSet attrs)
     {
         super(context, attrs);
         init(context, attrs);
     }

     public RippleView(Context context, AttributeSet attrs, int defStyle)
     {
         super(context, attrs, defStyle);
         init(context, attrs);
     }

     private void init(final Context context, final AttributeSet attrs)
     {
         if (isInEditMode())
             return;

         final TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.RippleView);
         rippleColor = typedArray.getColor(R.styleable.RippleView_rv_color, getResources().getColor(R.color.rippelColor));
         rippleType = typedArray.getInt(R.styleable.RippleView_rv_type, 0);
         hasToZoom = typedArray.getBoolean(R.styleable.RippleView_rv_zoom, false);
         isCentered = typedArray.getBoolean(R.styleable.RippleView_rv_centered, false);
         DURATION = typedArray.getInteger(R.styleable.RippleView_rv_rippleDuration, DURATION);
         FRAME_RATE = typedArray.getInteger(R.styleable.RippleView_rv_framerate, FRAME_RATE);
         PAINT_ALPHA = typedArray.getInteger(R.styleable.RippleView_rv_alpha, PAINT_ALPHA);
         ripplePadding = typedArray.getDimensionPixelSize(R.styleable.RippleView_rv_ripplePadding, 0);
         canvasHandler = new Handler();
         zoomScale = typedArray.getFloat(R.styleable.RippleView_rv_zoomScale, 1.03f);
         zoomDuration = typedArray.getInt(R.styleable.RippleView_rv_zoomDuration, 200);
         paint = new Paint();
         paint.setAntiAlias(true);
         paint.setStyle(Paint.Style.FILL);
         paint.setColor(rippleColor);
         paint.setAlpha(PAINT_ALPHA);
         this.setWillNotDraw(false);

         gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener()
         {
             @Override
             public boolean onSingleTapConfirmed(MotionEvent e)
             {
                 return true;
             }

             @Override
             public boolean onSingleTapUp(MotionEvent e)
             {
                 return true;
             }
         });

         this.setDrawingCacheEnabled(true);
     }

     @Override
     public void addView(View child, int index, ViewGroup.LayoutParams params)
     {
         childView = child;
         super.addView(child, index, params);
     }

     @Override
     public void draw(Canvas canvas)
     {
         super.draw(canvas);
         if (animationRunning)
         {
             if (DURATION <= timer * FRAME_RATE)
             {
                 animationRunning = false;
                 timer = 0;
                 durationEmpty = -1;
                 timerEmpty = 0;
                 canvas.restore();
                 invalidate();
                 return;
             }
             else
                 canvasHandler.postDelayed(runnable, FRAME_RATE);

             if (timer == 0)
                 canvas.save();


             canvas.drawCircle(x, y, (radiusMax * (((float) timer * FRAME_RATE) / DURATION)), paint);

             paint.setColor(getResources().getColor(android.R.color.holo_red_light));

             if (rippleType == 1 && originBitmap != null && (((float) timer * FRAME_RATE) / DURATION) > 0.4f)
             {
                 if (durationEmpty == -1)
                     durationEmpty = DURATION - timer * FRAME_RATE;

                 timerEmpty++;
                 final Bitmap tmpBitmap = getCircleBitmap((int) ((radiusMax) * (((float) timerEmpty * FRAME_RATE) / (durationEmpty))));
                 canvas.drawBitmap(tmpBitmap, 0, 0, paint);
                 tmpBitmap.recycle();
             }

             paint.setColor(rippleColor);

             if (rippleType == 1)
             {
                 if ((((float) timer * FRAME_RATE) / DURATION) > 0.6f)
                     paint.setAlpha((int) (PAINT_ALPHA - ((PAINT_ALPHA) * (((float) timerEmpty * FRAME_RATE) / (durationEmpty)))));
                 else
                     paint.setAlpha(PAINT_ALPHA);
             }
             else
                 paint.setAlpha((int) (PAINT_ALPHA - ((PAINT_ALPHA) * (((float) timer * FRAME_RATE) / DURATION))));

             timer++;
         }
     }

     @Override
     protected void onSizeChanged(int w, int h, int oldw, int oldh)
     {
         super.onSizeChanged(w, h, oldw, oldh);
         WIDTH = w;
         HEIGHT = h;

         scaleAnimation = new ScaleAnimation(1.0f, zoomScale, 1.0f, zoomScale, w / 2, h / 2);
         scaleAnimation.setDuration(zoomDuration);
         scaleAnimation.setRepeatMode(Animation.REVERSE);
         scaleAnimation.setRepeatCount(1);
     }

     @Override
     public boolean onTouchEvent(MotionEvent event)
     {
         if (gestureDetector.onTouchEvent(event) && !animationRunning)
         {
             if (hasToZoom)
                 this.startAnimation(scaleAnimation);

             radiusMax = Math.max(WIDTH, HEIGHT);

             if (rippleType != 2)
                 radiusMax /= 2;

             radiusMax -= ripplePadding;

             if (isCentered || rippleType == 1)
             {
                 this.x = getMeasuredWidth() / 2;
                 this.y = getMeasuredHeight() / 2;
             }
             else
             {
                 this.x = event.getX();
                 this.y = event.getY();
             }

             animationRunning = true;

             if (rippleType == 1 && originBitmap == null)
                 originBitmap = getDrawingCache(true);

             invalidate();
             this.performClick();
         }

         childView.onTouchEvent(event);
         return true;
     }

     @Override
     public boolean onInterceptTouchEvent(MotionEvent event)
     {
        return true;
     }

     private Bitmap getCircleBitmap(final int radius) {
         final Bitmap output = Bitmap.createBitmap(originBitmap.getWidth(), originBitmap.getHeight(), Bitmap.Config.ARGB_8888);
         final Canvas canvas = new Canvas(output);
         final Paint paint = new Paint();
         final Rect rect = new Rect((int)(x - radius), (int)(y - radius), (int)(x + radius), (int)(y + radius));

         paint.setAntiAlias(true);
         canvas.drawARGB(0, 0, 0, 0);
         canvas.drawCircle(x, y, radius, paint);

         paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
         canvas.drawBitmap(originBitmap, rect, rect, paint);

         return output;
     }
 }

2.MainActivity.java:

 package com.example.test;

 import com.example.rippleeffectview.RippleView;

 import android.os.Bundle;
 import android.support.v7.app.ActionBarActivity;
 import android.view.Menu;
 import android.view.MenuItem;

 public class MainActivity extends ActionBarActivity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
          final RippleView rippleView = (RippleView) findViewById(R.id.more);
     }

     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         // Inflate the menu; this adds items to the action bar if it is present.
         getMenuInflater().inflate(R.menu.main, menu);
         return true;
     }

     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         // Handle action bar item clicks here. The action bar will
         // automatically handle clicks on the Home/Up button, so long
         // as you specify a parent activity in AndroidManifest.xml.
         int id = item.getItemId();
         if (id == R.id.action_settings) {
             return true;
         }
         return super.onOptionsItemSelected(item);
     }
 }

3.布局文件应该是需要注意的地方：

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:ripple="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent" >

     <com.example.rippleeffectview.RippleView
         android:id="@+id/more"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_margin="5dp"
         ripple:rv_centered="true"
         ripple:rv_type="rectangle" >

         <Button
             android:layout_width="match_parent"
             android:layout_height="80dp"
             android:background="@color/switch_thumb_normal_material_dark"
             android:text="I like Color" />
     com.example.rippleeffectview.RippleView>

 RelativeLayout>

需要注意的地方如下图：

ripple:rv_centered="true"表示涟漪出现在中间位置；

ripple:rv_type="rectangle"表示涟漪的形状-长方形；

此外还有：

ripple:rv_type="doubleRipple"表示双涟漪；

ripple:rv_zoom="true"表示控件有缩放效果

ripple:rv_color="#000000"表示涟漪的颜色为黑色

还有其他属性在这里：

 <resources>
     <declare-styleable name="RippleView">
         <attr name="rv_alpha" format="integer" />
         <attr name="rv_framerate" format="integer"/>
         <attr name="rv_rippleDuration" format="integer"/>
         <attr name="rv_zoomDuration" format="integer" />
         <attr name="rv_color" format="color" />
         <attr name="rv_centered" format="boolean" />
         <attr name="rv_type" format="enum">
             <enum name="simpleRipple" value="0"/>
             <enum name="doubleRipple" value="1"/>
             <enum name="rectangle" value="2" />
         attr>
         <attr name="rv_ripplePadding" format="dimension" />
         <attr name="rv_zoom" format="boolean" />
         <attr name="rv_zoomScale" format="float" />

     declare-styleable>
 resources>

大家可以自行测试效果。

运行效果如下：

下面讨论一下如何将项目引入到自己的工程中：

复制上面箭头指向的三个文件到自己的项目中，按照上面例子所示的方法把控件包起来即可使用，非常方便，不懂的地方可以留言，谢谢！

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