{"id":644,"date":"2023-04-03T23:01:44","date_gmt":"2023-04-03T15:01:44","guid":{"rendered":"https:\/\/iichen.cn\/?p=644"},"modified":"2023-04-03T23:01:44","modified_gmt":"2023-04-03T15:01:44","slug":"android-%e8%87%aa%e5%ae%9a%e4%b9%89view%e4%b9%8b%e8%b7%9f%e9%9a%8f%e6%89%8b%e6%8c%87%e6%bb%91%e5%8a%a8%e7%9a%84view","status":"publish","type":"post","link":"https:\/\/iichen.cn\/?p=644","title":{"rendered":"Android-\u81ea\u5b9a\u4e49View\u4e4b\u8ddf\u968f\u624b\u6307\u6ed1\u52a8\u7684View"},"content":{"rendered":"<pre><code class=\"language-java line-numbers\">public class CustomImageView extends AppCompatImageView implements View.OnTouchListener {\n    private float lastX, lastY;\n    private int screenWidth, screenHeight;\n    private int imageWidth, imageHeight;\n    private float translationX, translationY;\n\n    public CustomImageView(Context context) {\n        super(context);\n        init();\n    }\n\n    public CustomImageView(Context context, AttributeSet attrs) {\n        super(context, attrs);\n        init();\n    }\n\n    public CustomImageView(Context context, AttributeSet attrs, int defStyle) {\n        super(context, attrs, defStyle);\n        init();\n    }\n\n    private void init() {\n        setOnTouchListener(this);\n        DisplayMetrics displayMetrics = getResources().getDisplayMetrics();\n        screenWidth = displayMetrics.widthPixels;\n        screenHeight = displayMetrics.heightPixels - getStatusBarHeight() - getNavigationBarHeight();\n    }\n\n    private int getStatusBarHeight() {\n        int resourceId = getResources().getIdentifier(\"status_bar_height\", \"dimen\", \"android\");\n        return resourceId &gt; 0 ? getResources().getDimensionPixelSize(resourceId) : 0;\n    }\n\n    private int getNavigationBarHeight() {\n        int resourceId = getResources().getIdentifier(\"navigation_bar_height\", \"dimen\", \"android\");\n        return resourceId &gt; 0 ? getResources().getDimensionPixelSize(resourceId) : 0;\n    }\n\n    @Override\n    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {\n        super.onMeasure(widthMeasureSpec, heightMeasureSpec);\n        imageWidth = getMeasuredWidth();\n        imageHeight = getMeasuredHeight();\n    }\n\n    @Override\n    public boolean onTouch(View v, MotionEvent event) {\n        float x = event.getRawX();\n        float y = event.getRawY();\n\n        switch (event.getAction()) {\n            case MotionEvent.ACTION_DOWN:\n                lastX = x;\n                lastY = y;\n                break;\n            case MotionEvent.ACTION_MOVE:\n                float dx = x - lastX;\n                float dy = y - lastY;\n\n                translationX += dx;\n                translationY += dy;\n\n                \/\/ \u5224\u65ad\u56fe\u7247\u662f\u5426\u8d85\u51fa\u4e86\u5c4f\u5e55\u8303\u56f4\n                if (translationX &lt; 0) {\n                    translationX = 0;\n                }\n                if (translationY &lt; 0) {\n                    translationY = 0;\n                }\n                if (translationX + imageWidth &gt; screenWidth) {\n                    translationX = screenWidth - imageWidth;\n                }\n                if (translationY + imageHeight &gt; screenHeight) {\n                    translationY = screenHeight - imageHeight;\n                }\n\n                setTranslationX(translationX);\n                setTranslationY(translationY);\n\n                lastX = x;\n                lastY = y;\n                break;\n            case MotionEvent.ACTION_UP:\n                \/\/ \u4e0d\u9700\u8981\u505a\u4efb\u4f55\u4e8b\u60c5\n                break;\n            default:\n        }\n\n        return true;\n    }\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>public class CustomImageView extends AppCompatImageView [&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-644","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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