Android對View進行包裹, 實現鏡面發射效果

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這個在TV上用的挺多的, 網上很多都是對ImageView的圖片做的, 感覺不是很好, 這裡實現了一個可以對任何View做倒影的.

/** *  * @className: MirrorView * @description: 對普通View做封裝, 讓這個View出現倒影效果, 注意,使用這個View之後, *               會讓原來的View的Height擴大REFHEIGHT高度, 用來顯示反射鏡面, * @author: gaoshuai * @date: 2015年8月11日 上午11:31:16 */public class MirrorView extends FrameLayout{    private View mContentView;    protected boolean mHasReflection = true;    private static int REFHEIGHT = -1;    public static Paint RefPaint = null;        private Bitmap mReflectBitmap;    private Canvas mReflectCanvas;        public MirrorView(Context context) {        super(context);                if (REFHEIGHT == -1)            REFHEIGHT = 100;        if (RefPaint == null) {            RefPaint = new Paint(Paint.ANTI_ALIAS_FLAG);            RefPaint.setShader(new LinearGradient(0, 0, 0, REFHEIGHT, new int[] { 0x77000000, 0x66AAAAAA, 0x0500000, 0x00000000 }, new float[] { 0.0f, 0.1f, 0.9f, 1.0f }, Shader.TileMode.CLAMP));            RefPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));        }                this.setClickable(true);    }        public void setContentView(View view) {        FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);        lp.bottomMargin = REFHEIGHT;        mContentView = view;        addView(view, lp);    }        public View getContentView() {        return mContentView;    }        public void setReflection(boolean ref) {        mHasReflection = ref;    }        @Override    public boolean performClick() {        return mContentView.performClick();    }        @Override    protected void dispatchDraw(Canvas canvas) {        super.dispatchDraw(canvas);        if (mHasReflection) {            if (mReflectBitmap == null) {                mReflectBitmap = Bitmap.createBitmap(mContentView.getWidth(), REFHEIGHT, Bitmap.Config.ARGB_8888);                mReflectCanvas = new Canvas(mReflectBitmap);            }            drawReflection(mReflectCanvas, mContentView); //繪製這個View的反射效果            canvas.save();            int dy = mContentView.getBottom();            int dx = mContentView.getLeft();            canvas.translate(dx, dy);            canvas.drawBitmap(mReflectBitmap, 0, 0, null);            canvas.restore();        }    }        public Bitmap getReflectBitmap() {        return mReflectBitmap;    }        public void drawReflection(Canvas canvas, View view) {        canvas.save();        canvas.clipRect(0, 0, view.getWidth(), REFHEIGHT);        canvas.save();        canvas.scale(1, -1);        canvas.translate(0, -view.getHeight());        view.draw(canvas);        canvas.restore();        canvas.drawRect(0, 0, view.getWidth(), REFHEIGHT, RefPaint);        canvas.restore();    }}

測試Activity

public class MainActivity extends Activity{        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        FrameLayout container = (FrameLayout) findViewById(R.id.test);        MirrorView mirrorItemView = new MirrorView(this);        TextView textView = new TextView(this);        textView.setWidth(300);        textView.setText("我就是想測試一下鏡子View");        textView.setBackgroundResource(R.drawable.ic_launcher);        mirrorItemView.setContentView(textView);        container.addView(mirrorItemView);    }}

Android對View進行包裹, 實現鏡面發射效果