自定義控件實戰<二> 圖文混合控件

2019-11-06 10:03:58

字體：大中小

來源：轉載

供稿：網友

上一篇文章簡單實現了文字控件,這篇文章在此基礎上面繼續實現一個圖片和文字混合展示的控件。

一、在attrs.xml中添加自定義屬性：

<?xml version="1.0" encoding="utf-8"?><resources> <declare-styleable name="CustomImageView"> <attr name="titleText" /> <attr name="titleTextColor" /> <attr name="titleTextSize" /> <attr name="image" /> <attr name="imageScaleType" /> </declare-styleable> <attr name="titleText" format="string" /> <attr name="titleTextColor" format="color" /> <attr name="titleTextSize" format="dimension" /> <attr name="image" format="reference" /> <attr name="imageScaleType"> <enum name="fillXY" value="0" /> <enum name="center" value="1" /> </attr></resources>

二、重寫SimpleView_02控件的構造函數

public SimpleView_02(Context context) { //調用自身的構造方法二 this(context, null); Log.e("SimpleView構造方法一", "被執行"); } public SimpleView_02(Context context, AttributeSet attrs) { //調用自身的構造方法三 this(context, attrs, 0); Log.e("SimpleView構造方法二", "被執行"); } public SimpleView_02(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); Log.e("SimpleView構造方法三", "被執行"); /** * 獲得我們所定義的自定義樣式屬性 */ TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.CustomImageView, defStyleAttr, 0); int length = a.getIndexCount(); for (int i = 0; i < length; i++) { int attr = a.getIndex(i); switch (attr) { case R.styleable.CustomImageView_image: // mImage = BitmapFactory.decodeResource(getResources(), a.getResourceId(attr, 0)); mImage = scaleBitmap(a, attr); break; case R.styleable.CustomImageView_imageScaleType: mImageScale = a.getInt(attr, 0); break; case R.styleable.CustomImageView_titleText: mTitle = a.getString(attr); break; case R.styleable.CustomImageView_titleTextColor: mTextColor = a.getColor(attr, Color.BLACK); break; case R.styleable.CustomImageView_titleTextSize: mTextSize = a.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics())); break; } } a.recycle(); /** * 獲得繪制文本的寬和高 */ mPaint = new Paint(); mPaint.setTextSize(mTextSize); // mPaint.setColor(mTitleTextColor); mRectText = new Rect(); rect = new Rect(); mPaint.getTextBounds(mTitle, 0, mTitle.length(), mRectText); } //對獲取到的位圖進行大小縮放 PRivate Bitmap scaleBitmap(TypedArray a, int attr) { Bitmap mTImage = BitmapFactory.decodeResource(getResources(), a.getResourceId(attr, 0)); // 獲得圖片的寬高 int width = mTImage.getWidth(); int height = mTImage.getHeight(); // 設置想要的大小 int newWidth = 100; int newHeight = 100; // 計算縮放比例 float scaleWidth = ((float) newWidth) / width; float scaleHeight = ((float) newHeight) / height; // 取得想要縮放的matrix參數 Matrix matrix = new Matrix(); matrix.postScale(scaleWidth, scaleHeight); // 得到新的圖片 return Bitmap.createBitmap(mTImage, 0, 0, width, height, matrix, true); }

三、重寫SimpleView_02控件的onMeasure

@Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { //設置寬度 int specMode = MeasureSpec.getMode(widthMeasureSpec); int specSize = MeasureSpec.getSize(widthMeasureSpec); switch (specMode) { case MeasureSpec.EXACTLY:// match_parent , accurate mWidth = specSize; Log.e("模式", "EXACTLY"); break; default: int desireWidthByImg = getPaddingLeft() + getPaddingRight()+ mImage.getWidth(); int desireWidthByTitle = getPaddingLeft() + getPaddingRight()+ mRectText.width(); if (specMode == MeasureSpec.AT_MOST){// wrap_content int desireWidth = Math.max(desireWidthByImg,desireWidthByTitle); mWidth = Math.min(desireWidth,specSize); Log.e("模式", "AT_MOST"); } break; } //設置高度 specMode = MeasureSpec.getMode(heightMeasureSpec); specSize = MeasureSpec.getSize(heightMeasureSpec); switch (specMode) { case MeasureSpec.EXACTLY:// match_parent , accurate mHeight = specSize; break; default: int desireHeight = getPaddingTop() + getPaddingBottom()+ mImage.getHeight()+mRectText.height(); if (specMode == MeasureSpec.AT_MOST){// wrap_content mHeight = Math.min(desireHeight,specSize); Log.e("模式", "AT_MOST"); } break; } setMeasuredDimension(mWidth,mHeight); }

四、重寫SimpleView_02控件的onDraw

@Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); mPaint.setStrokeWidth(4); mPaint.setStyle(Paint.Style.STROKE); mPaint.setColor(Color.CYAN); canvas.drawRect(0, 0, getMeasuredWidth(),getMeasuredHeight(), mPaint); rect.left = getPaddingLeft(); rect.right = mWidth-getPaddingRight(); rect.top = getPaddingTop(); rect.bottom = mHeight-getPaddingBottom(); mPaint.setColor(mTextColor); mPaint.setStyle(Paint.Style.FILL); /** * 當前設置的寬度小于字體需要的寬度，將字體改為xxx... */ if (mRectText.width() > mWidth) { TextPaint paint = new TextPaint(mPaint); String msg = TextUtils.ellipsize(mTitle, paint, (float) mWidth - getPaddingLeft() - getPaddingRight(), TextUtils.TruncateAt.END).toString(); canvas.drawText(msg, getPaddingLeft(), mHeight - getPaddingBottom(), mPaint); } else { //正常情況，將字體居中 canvas.drawText(mTitle, mWidth / 2 - mRectText.width() * 1.0f / 2, mHeight - getPaddingBottom(), mPaint); } if(mImageScale == IMAGE_SCALE_FITXY){ rect.bottom -= mRectText.height(); canvas.drawBitmap(mImage,null,rect,mPaint); }else{// rect.left = mWidth/2-mImage.getWidth()/2;// rect.right = mWidth/2+mImage.getWidth()/2;// rect.top = mHeight/2+mImage.getHeight()/2;// rect.bottom = mHeight/2-mImage.getHeight()/2;// canvas.drawBitmap(mImage,null,rect,mPaint); //計算居中的矩形范圍 rect.left = mWidth / 2 - mImage.getWidth() / 2; rect.right = mWidth / 2 + mImage.getWidth() / 2; rect.top = (mHeight - mRectText.height()) / 2 - mImage.getHeight() / 2; rect.bottom = (mHeight - mRectText.height()) / 2 + mImage.getHeight() / 2; canvas.drawBitmap(mImage, null, rect, mPaint); } }