Android ExplosionField之粒子破碎爆炸效果

Android ExplosionField之粒子破碎爆炸效果

一.效果图：

二.快速实现：

1.添加依赖：

dependencies {
   //compile 'tyrantgit:explosionfield:1.0.1'
implementation 'tyrantgit:explosionfield:1.0.1'
 }

2.简单的操作：

//获取ExplosionField对象
 ExplosionField explosionField = ExplosionField.attach2Window(this);
//对指定的view实现爆炸动画效果  
explosionField.explode(view);
explosionField.clear();//清除爆炸效果
explosionField.expandExplosionBound(int dx,int dy);//爆炸效果占屏幕的范围

3.1.贴出全部代码，主函数：

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

/**
 * 实现View的粉碎效果
 * https://github.com/tyrantgit/ExplosionField
 */
public class ExplosionFieldActivity extends AppCompatActivity{
    private ExplosionField mExplosionField;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_explosionfield);
        mExplosionField = ExplosionField.attach2Window(this);
        addListener(findViewById(R.id.root));
    }

    private void addListener(View root) {
        if (root instanceof ViewGroup) {
            ViewGroup parent = (ViewGroup) root;
            for (int i = 0; i < parent.getChildCount(); i++) {
                addListener(parent.getChildAt(i));
            }
        } else {
            root.setClickable(true);
            root.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    mExplosionField.explode(v);
                    v.setOnClickListener(null);
                }
            });
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_main,menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == R.id.action_reset) {
            View root = findViewById(R.id.root);
            reset(root);
            addListener(root);
            mExplosionField.clear();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    private void reset(View root) {
        if (root instanceof ViewGroup) {
            ViewGroup parent = (ViewGroup) root;
            for (int i = 0; i < parent.getChildCount(); i++) {
                reset(parent.getChildAt(i));
            }
        } else {
            root.setScaleX(1);
            root.setScaleY(1);
            root.setAlpha(1);
        }
    }
}

3.2.主函数布局：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/root"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="48dp"
        android:orientation="horizontal">

        <ImageView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:clickable="true"
            android:src="@drawable/p1" />


        <ImageView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:clickable="true"
            android:src="@drawable/p6" />

        <ImageView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:src="@drawable/p2" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="48dp"
        android:orientation="horizontal">

        <ImageView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:clickable="true"
            android:src="@drawable/p4" />

        <ImageView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:src="@drawable/p5" />

        <ImageView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:src="@drawable/p3" />

    </LinearLayout>

    <TextView
        android:layout_width="match_parent"
        android:gravity="center"
        android:layout_marginTop="48dp"
        android:text="click to destroy"
        android:layout_height="wrap_content" />


</LinearLayout>

3.3.自定义ExplosionField：

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Random;


public class ExplosionField extends View {

    private List<ExplosionAnimator> mExplosions = new ArrayList<>();
    private int[] mExpandInset = new int[2];

    public ExplosionField(Context context) {
        super(context);
        init();
    }

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

    public ExplosionField(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        Arrays.fill(mExpandInset, Utils.dp2Px(32));
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        for (ExplosionAnimator explosion : mExplosions) {
            explosion.draw(canvas);
        }
    }

    public void expandExplosionBound(int dx, int dy) {
        mExpandInset[0] = dx;
        mExpandInset[1] = dy;
    }

    public void explode(Bitmap bitmap, Rect bound, long startDelay, long duration) {
        final ExplosionAnimator explosion = new ExplosionAnimator(this, bitmap, bound);
        explosion.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                mExplosions.remove(animation);
            }
        });
        explosion.setStartDelay(startDelay);
        explosion.setDuration(duration);
        mExplosions.add(explosion);
        explosion.start();
    }

    public void explode(final View view) {
        Rect r = new Rect();
        view.getGlobalVisibleRect(r);
        int[] location = new int[2];
        getLocationOnScreen(location);
        r.offset(-location[0], -location[1]);
        r.inset(-mExpandInset[0], -mExpandInset[1]);
        int startDelay = 100;
        ValueAnimator animator = ValueAnimator.ofFloat(0f, 1f).setDuration(150);
        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

            Random random = new Random();

            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                view.setTranslationX((random.nextFloat() - 0.5f) * view.getWidth() * 0.05f);
                view.setTranslationY((random.nextFloat() - 0.5f) * view.getHeight() * 0.05f);

            }
        });
        animator.start();
        view.animate().setDuration(150).setStartDelay(startDelay).scaleX(0f).scaleY(0f).alpha(0f).start();
        explode(Utils.createBitmapFromView(view), r, startDelay, ExplosionAnimator.DEFAULT_DURATION);
    }

    public void clear() {
        mExplosions.clear();
        invalidate();
    }

    public static ExplosionField attach2Window(Activity activity) {
        ViewGroup rootView = (ViewGroup) activity.findViewById(Window.ID_ANDROID_CONTENT);
        ExplosionField explosionField = new ExplosionField(activity);
        rootView.addView(explosionField, new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
        return explosionField;
    }

}

3.4.动画类：

import android.animation.ValueAnimator;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.view.View;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.Interpolator;

import java.util.Random;

public class ExplosionAnimator extends ValueAnimator {

    static long DEFAULT_DURATION = 0x400;
    private static final Interpolator DEFAULT_INTERPOLATOR = new AccelerateInterpolator(0.6f);
    private static final float END_VALUE = 1.4f;
    private static final float X = Utils.dp2Px(5);
    private static final float Y = Utils.dp2Px(20);
    private static final float V = Utils.dp2Px(2);
    private static final float W = Utils.dp2Px(1);
    private Paint mPaint;
    private Particle[] mParticles;
    private Rect mBound;
    private View mContainer;

    public ExplosionAnimator(View container, Bitmap bitmap, Rect bound) {
        mPaint = new Paint();
        mBound = new Rect(bound);
        int partLen = 15;
        mParticles = new Particle[partLen * partLen];
        Random random = new Random(System.currentTimeMillis());
        int w = bitmap.getWidth() / (partLen + 2);
        int h = bitmap.getHeight() / (partLen + 2);
        for (int i = 0; i < partLen; i++) {
            for (int j = 0; j < partLen; j++) {
                mParticles[(i * partLen) + j] = generateParticle(bitmap.getPixel((j + 1) * w, (i + 1) * h), random);
            }
        }
        mContainer = container;
        setFloatValues(0f, END_VALUE);
        setInterpolator(DEFAULT_INTERPOLATOR);
        setDuration(DEFAULT_DURATION);
    }

    private Particle generateParticle(int color, Random random) {
        Particle particle = new Particle();
        particle.color = color;
        particle.radius = V;
        if (random.nextFloat() < 0.2f) {
            particle.baseRadius = V + ((X - V) * random.nextFloat());
        } else {
            particle.baseRadius = W + ((V - W) * random.nextFloat());
        }
        float nextFloat = random.nextFloat();
        particle.top = mBound.height() * ((0.18f * random.nextFloat()) + 0.2f);
        particle.top = nextFloat < 0.2f ? particle.top : particle.top + ((particle.top * 0.2f) * random.nextFloat());
        particle.bottom = (mBound.height() * (random.nextFloat() - 0.5f)) * 1.8f;
        float f = nextFloat < 0.2f ? particle.bottom : nextFloat < 0.8f ? particle.bottom * 0.6f : particle.bottom * 0.3f;
        particle.bottom = f;
        particle.mag = 4.0f * particle.top / particle.bottom;
        particle.neg = (-particle.mag) / particle.bottom;
        f = mBound.centerX() + (Y * (random.nextFloat() - 0.5f));
        particle.baseCx = f;
        particle.cx = f;
        f = mBound.centerY() + (Y * (random.nextFloat() - 0.5f));
        particle.baseCy = f;
        particle.cy = f;
        particle.life = END_VALUE / 10 * random.nextFloat();
        particle.overflow = 0.4f * random.nextFloat();
        particle.alpha = 1f;
        return particle;
    }

    public boolean draw(Canvas canvas) {
        if (!isStarted()) {
            return false;
        }
        for (Particle particle : mParticles) {
            particle.advance((float) getAnimatedValue());
            if (particle.alpha > 0f) {
                mPaint.setColor(particle.color);
                mPaint.setAlpha((int) (Color.alpha(particle.color) * particle.alpha));
                canvas.drawCircle(particle.cx, particle.cy, particle.radius, mPaint);
            }
        }
        mContainer.invalidate();
        return true;
    }

    @Override
    public void start() {
        super.start();
        mContainer.invalidate(mBound);
    }

    private class Particle {
        float alpha;
        int color;
        float cx;
        float cy;
        float radius;
        float baseCx;
        float baseCy;
        float baseRadius;
        float top;
        float bottom;
        float mag;
        float neg;
        float life;
        float overflow;


        public void advance(float factor) {
            float f = 0f;
            float normalization = factor / END_VALUE;
            if (normalization < life || normalization > 1f - overflow) {
                alpha = 0f;
                return;
            }
            normalization = (normalization - life) / (1f - life - overflow);
            float f2 = normalization * END_VALUE;
            if (normalization >= 0.7f) {
                f = (normalization - 0.7f) / 0.3f;
            }
            alpha = 1f - f;
            f = bottom * f2;
            cx = baseCx + f;
            cy = (float) (baseCy - this.neg * Math.pow(f, 2.0)) - f * mag;
            radius = V + (baseRadius - V) * f2;
        }
    }
}

 3.5.其它工具类：

import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.widget.ImageView;

public class Utils {

    private Utils() {
    }

    private static final float DENSITY = Resources.getSystem().getDisplayMetrics().density;
    private static final Canvas sCanvas = new Canvas();

    public static int dp2Px(int dp) {
        return Math.round(dp * DENSITY);
    }

    public static Bitmap createBitmapFromView(View view) {
        if (view instanceof ImageView) {
            Drawable drawable = ((ImageView) view).getDrawable();
            if (drawable != null && drawable instanceof BitmapDrawable) {
                return ((BitmapDrawable) drawable).getBitmap();
            }
        }
        view.clearFocus();
        Bitmap bitmap = createBitmapSafely(view.getWidth(),
                view.getHeight(), Bitmap.Config.ARGB_8888, 1);
        if (bitmap != null) {
            synchronized (sCanvas) {
                Canvas canvas = sCanvas;
                canvas.setBitmap(bitmap);
                view.draw(canvas);
                canvas.setBitmap(null);
            }
        }
        return bitmap;
    }

    public static Bitmap createBitmapSafely(int width, int height, Bitmap.Config config, int retryCount) {
        try {
            return Bitmap.createBitmap(width, height, config);
        } catch (OutOfMemoryError e) {
            e.printStackTrace();
            if (retryCount > 0) {
                System.gc();
                return createBitmapSafely(width, height, config, retryCount - 1);
            }
            return null;
        }
    }
}

3.6.图片使用的是webp图，不要使用较大的图片，不然会有延时。图片请下载下面的:

 

参考：https://github.com/tyrantgit/ExplosionField