记录一个自定义Imageview

xiaoxiao2021-02-28  10

记录一个自定义imageview  根据网上找到的圆角Imageview 做的修改。可实现焦点放大和缩小。并且获取焦点会展示阴影和白框。

import android.content.Context; import android.content.res.TypedArray; import android.graphics.Bitmap; import android.graphics.BitmapShader; 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.Rect; import android.graphics.RectF; import android.graphics.Shader.TileMode; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.os.Build; import android.os.Bundle; import android.os.Parcelable; import android.support.v4.view.ViewCompat; import android.support.v7.widget.AppCompatImageView; import android.util.AttributeSet; import android.util.Log; import android.util.TypedValue; import android.view.View; import android.view.ViewGroup; import com.example.administrator.mytvapplication.R; /** * http://blog.csdn.net/lmj623565791/article/details/41967509 * 自定义圆角imageview */ public class RoundImageView extends AppCompatImageView { /** * 图片的类型,圆形or圆角 */ private int type; public static final int TYPE_CIRCLE = 0; public static final int TYPE_ROUND = 1; /** * 圆角大小的默认值 */ private static final int BODER_RADIUS_DEFAULT = 10; /** * 圆角的大小 */ private int mBorderRadius; /** * 绘图的Paint */ private Paint mBitmapPaint; /** * 边框paint */ Paint borderPaint; /** * 圆角的半径 */ private int mRadius; /** * 3x3 矩阵,主要用于缩小放大 */ private Matrix mMatrix; /** * 渲染图像,使用图像为绘制图形着色 */ private BitmapShader mBitmapShader; /** * view的宽度 */ private int mWidth; private RectF mRoundRect; /** * 创建底层画布 * */ private Canvas bottomCanvas; /** * 底层画布bitmap */ private Bitmap bottomBitmap=null; /** * * 底层画布rect */ private RectF bottomR; private int borderW=3; public RoundImageView(Context context, AttributeSet attrs) { super(context, attrs); mMatrix = new Matrix(); mBitmapPaint = new Paint(); mBitmapPaint.setAntiAlias(true); borderPaint=new Paint(); borderPaint.setColor(Color.WHITE); borderPaint.setAntiAlias(true); borderPaint.setStrokeWidth(4f); borderPaint.setShadowLayer(5f, 0, 0, Color.BLACK); TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.RoundImageView); mBorderRadius = a.getDimensionPixelSize( R.styleable.RoundImageView_borderRadius, (int) TypedValue .applyDimension(TypedValue.COMPLEX_UNIT_DIP, BODER_RADIUS_DEFAULT, getResources() .getDisplayMetrics()));// 默认为10dp type = a.getInt(R.styleable.RoundImageView_type, TYPE_CIRCLE);// 默认为Circle a.recycle(); } public RoundImageView(Context context) { this(context, null); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); /** * 如果类型是圆形,则强制改变view的宽高一致,以小值为准 */ if (type == TYPE_CIRCLE) { mWidth = Math.min(getMeasuredWidth(), getMeasuredHeight()); mRadius = mWidth / 2; setMeasuredDimension(mWidth, mWidth); } bottomBitmap = Bitmap.createBitmap(getMeasuredWidth()+8, getMeasuredHeight()+8, Bitmap.Config.ARGB_8888); bottomCanvas =new Canvas(bottomBitmap); Log.i("2024",getMeasuredWidth()+4+"---ac"+(getMeasuredHeight()+4)); } /** * 初始化BitmapShader */ private void setUpShader() { Drawable drawable = getDrawable(); if (drawable == null) { return; } Bitmap bmp = drawableToBitamp(drawable); // 将bmp作为着色器,就是在指定区域内绘制bmp mBitmapShader = new BitmapShader(bmp, TileMode.CLAMP, TileMode.CLAMP); float scale = 1.0f; if (type == TYPE_CIRCLE) { // 拿到bitmap宽或高的小值 int bSize = Math.min(bmp.getWidth(), bmp.getHeight()); scale = mWidth * 1.0f / bSize; } else if (type == TYPE_ROUND) { // Log.e("TAG", // "b'w = " + bmp.getWidth() + " , " + "b'h = " // + bmp.getHeight()); if (!(bmp.getWidth() == getWidth() && bmp.getHeight() == getHeight())) { // 如果图片的宽或者高与view的宽高不匹配,计算出需要缩放的比例;缩放后的图片的宽高,一定要大于我们view的宽高;所以我们这里取大值; scale = Math.max(getWidth() * 1.0f / bmp.getWidth(), getHeight() * 1.0f / bmp.getHeight()); } } getmWidth=getWidth()*scale; getGetmWidth=getHeight()*scale; // shader的变换矩阵,我们这里主要用于放大或者缩小 mMatrix.setScale(scale, scale); // 设置变换矩阵 mBitmapShader.setLocalMatrix(mMatrix); // 设置shader mBitmapPaint.setShader(mBitmapShader); } float getmWidth; float getGetmWidth; @Override protected void onDraw(final Canvas canvas) { // Log.e("TAG", "onDraw"); if (getDrawable() == null) { return; } if(bottomBitmap!=null){ Paint bottomPaint=new Paint(); bottomPaint.setAntiAlias(true); bottomPaint.setColor(Color.WHITE); canvas.drawBitmap(bottomBitmap,0,0,bottomPaint); } setUpShader(); if (type == TYPE_ROUND) { canvas.drawRoundRect(mRoundRect, mBorderRadius, mBorderRadius, mBitmapPaint); // setOnFocusChangeListener(new OnFocusChangeListener() { @Override public void onFocusChange(View v, boolean hasFocus) { if(hasFocus){ bottomCanvas.drawRoundRect(bottomR,mBorderRadius,mBorderRadius ,borderPaint); if(Build.VERSION.SDK_INT>=21){ //太高z抽 ViewCompat.animate(RoundImageView.this).scaleX(1.30f).scaleY(1.30f).translationZ(1).start(); }else{ ViewCompat.animate(RoundImageView.this).scaleX(1.30f).scaleY(1.30f).start(); /*ViewGroup parent = (ViewGroup) RoundImageView.this.getParent(); parent.requestLayout(); parent.invalidate();*/ } }else{ //清屏 borderPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR)); bottomCanvas.drawPaint(borderPaint); borderPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC)); if (Build.VERSION.SDK_INT >= 21) { ViewCompat.animate(RoundImageView.this).scaleX(1.0f).scaleY(1.0f).translationZ(0).start(); } else { ViewCompat.animate(RoundImageView.this).scaleX(1.0f).scaleY(1.0f).start(); /*ViewGroup parent = (ViewGroup) RoundImageView.this.getParent(); parent.requestLayout(); parent.invalidate();*/ } } } }); } else { canvas.drawCircle(mRadius, mRadius, mRadius, mBitmapPaint); // drawSomeThing(canvas); } } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); int boder=dp2px(borderW); // 圆角图片的范围 if (type == TYPE_ROUND) mRoundRect = new RectF(6, 6, w-6, h-6); bottomR=new RectF(); bottomR.set(4,4,w-4,h-4); } /** * drawable转bitmap * * @param drawable * @return */ private Bitmap drawableToBitamp(Drawable drawable) { if (drawable instanceof BitmapDrawable) { BitmapDrawable bd = (BitmapDrawable) drawable; return bd.getBitmap(); } int w = drawable.getIntrinsicWidth(); int h = drawable.getIntrinsicHeight(); Bitmap bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(bitmap); drawable.setBounds(0, 0, w, h); drawable.draw(canvas); return bitmap; } private static final String STATE_INSTANCE = "state_instance"; private static final String STATE_TYPE = "state_type"; private static final String STATE_BORDER_RADIUS = "state_border_radius"; @Override protected Parcelable onSaveInstanceState() { Bundle bundle = new Bundle(); bundle.putParcelable(STATE_INSTANCE, super.onSaveInstanceState()); bundle.putInt(STATE_TYPE, type); bundle.putInt(STATE_BORDER_RADIUS, mBorderRadius); return bundle; } @Override protected void onRestoreInstanceState(Parcelable state) { if (state instanceof Bundle) { Bundle bundle = (Bundle) state; super.onRestoreInstanceState(((Bundle) state) .getParcelable(STATE_INSTANCE)); this.type = bundle.getInt(STATE_TYPE); this.mBorderRadius = bundle.getInt(STATE_BORDER_RADIUS); } else { super.onRestoreInstanceState(state); } } public void setBorderRadius(int borderRadius) { int pxVal = dp2px(borderRadius); if (this.mBorderRadius != pxVal) { this.mBorderRadius = pxVal; invalidate(); } } public void setType(int type) { if (this.type != type) { this.type = type; if (this.type != TYPE_ROUND && this.type != TYPE_CIRCLE) { this.type = TYPE_CIRCLE; } requestLayout(); } } public int dp2px(int dpVal) { return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpVal, getResources().getDisplayMetrics()); } }

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