{"id":648,"date":"2023-04-03T23:43:00","date_gmt":"2023-04-03T15:43:00","guid":{"rendered":"https:\/\/iichen.cn\/?p=648"},"modified":"2023-04-03T23:43:00","modified_gmt":"2023-04-03T15:43:00","slug":"android-%e8%87%aa%e5%ae%9a%e4%b9%89view%e4%b9%8b%e6%bb%9a%e5%8a%a8%e5%9b%be%e7%89%87","status":"publish","type":"post","link":"https:\/\/iichen.cn\/?p=648","title":{"rendered":"Android-\u81ea\u5b9a\u4e49View\u4e4b\u6eda\u52a8\u56fe\u7247"},"content":{"rendered":"<pre><code class=\"language-java line-numbers\">\/\/ val h = (img.width * 1.0f \/ img.drawable.intrinsicWidth * img.drawable.intrinsicHeight).toInt()\n\n\/\/ val animator = ValueAnimator.ofInt(img.height,h)\n\npublic class LiveImageView extends AppCompatImageView {\n    private int mDx;\n    private int mMinDx;\n\n    public LiveImageView(@NonNull Context context) {\n        super(context);\n    }\n\n    public LiveImageView(@NonNull Context context, @Nullable AttributeSet attrs) {\n        super(context, attrs);\n    }\n\n    public LiveImageView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {\n        super(context, attrs, defStyleAttr);\n    }\n\n    public void setDx(int dx) {\n        if (getDrawable() == null) {\n            return;\n        }\n        mDx = dx - mMinDx;\n        if (mDx &lt;= 0) {\n            mDx = 0;\n        }\n        if (mDx &gt; getDrawable().getBounds().height() - mMinDx) {\n            mDx = getDrawable().getBounds().height() - mMinDx;\n        }\n        invalidate();\n    }\n\n    @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) {\n        super.onSizeChanged(w, h, oldw, oldh);\n        mMinDx = h;\n    }\n\n    public int getDx() {\n        return mDx;\n    }\n\n    @Override protected void onDraw(Canvas canvas) {\n\n        Drawable drawable = getDrawable();\n        int w = getWidth();\n        int h = (int) (getWidth() * 1.0f \/ drawable.getIntrinsicWidth() * drawable.getIntrinsicHeight());\n\n        \/\/ \u56fe\u7247drawable\u7684\u5de6\u4e0a\u89d2\u548c\u7531\u4e0b\u89d2\n        \/*\n            ImageView w = mathParent,h = 100\n            drawable.setBounds(0, 0, w, h \/ 2); \u5219\u6700\u7ec8\u56fe\u7247\u663e\u793a\u5c06\u88ab\u538b\u7f29\u663e\u793a\u5728 h \/ 2\u9ad8\u5ea6\n            drawable.setBounds(0, 0, w, 2h); \u5219\u6700\u7ec8\u56fe\u7247\u663e\u793a\u5c06\u57282h\u5185\u663e\u793a\uff0c\u5f53\u7136\u8d85\u51faImageView\u7684h\u90e8\u5206 drawble\u6700\u7ec8\u7684\u56fe\u7247\u5c55\u793a\u4e0d\u4f1a\u5b8c\u5168\u5c55\u793a 2h\u5373 \u4ec5\u4ec5\u90e8\u5206\u663e\u793a-\u622a\u53d6\n        *\/\n        drawable.setBounds(0, 0, w, h);\n        canvas.save();\n        canvas.translate(0, -getDx());\n        super.onDraw(canvas);\n        canvas.restore();\n    }\n\n    private Bitmap drawableToBitmap(Drawable drawable) {\n        if (drawable instanceof BitmapDrawable) {\n            BitmapDrawable bd = (BitmapDrawable) drawable;\n            return bd.getBitmap();\n        }\n        int w = drawable.getIntrinsicWidth();\n        int h = drawable.getIntrinsicHeight();\n        Bitmap bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);\n        Canvas canvas = new Canvas(bitmap);\n        drawable.setBounds(0, 0, w, h);\n        drawable.draw(canvas);\n        return bitmap;\n    }\n}\n<\/code><\/pre>\n<pre><code class=\"language-java line-numbers\">\/\/ bounds\u5b9e\u73b0\u7f29\u653e\nDrawable originalDrawable = context.getDrawable(R.drawable.my_image);\n\nint width = originalDrawable.getIntrinsicWidth();\nint height = originalDrawable.getIntrinsicHeight();\n\nint newWidth = (int) (width * scale);\nint newHeight = (int) (height * scale);\n\noriginalDrawable.setBounds(0, 0, newWidth, newHeight);\n\noriginalDrawable.draw(canvas);\n\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\/\/ val h = (img.width * 1.0f \/ img.drawable.intrinsicWi [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,8],"tags":[],"class_list":["post-648","post","type-post","status-publish","format-standard","hentry","category-android","category-8"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.4 - 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