可旋转放大截屏自定义View

class ZoomContainView @JvmOverloads constructor( context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = -1 ) : FrameLayout(context, attrs, defStyleAttr) { val TAG = "ZoomContainView" private fun init() { var zoomView = ZoomView(context) zoomView.setBackgroundResource(R.color.black) zoomView.id = R.id.zoom_view zoomView.layoutParams = LayoutParams(-1, -1).apply { width = LayoutParams.MATCH_PARENT height = LayoutParams.MATCH_PARENT layoutParams = this } var img = ImageView(context) img.scaleType = ImageView.ScaleType.FIT_CENTER img.id = R.id.img_zoom zoomView.addView(img, -1, -1) addView(zoomView) } fun loadImgUrl(url: Any) { findViewById(R.id.zoom_view).run { scaleX = 1f scaleY = 1f translationX = 0f translationY = 0f rotation = 0f } var img = findViewById(R.id.img_zoom) Glide.with(context).asBitmap().load(url).apply( RequestOptions().placeholder(R.color.black)) .addListener(object : RequestListener { override fun onLoadFailed(e: GlideException?, model: Any?, target: Target?, isFirstResource: Boolean): Boolean { return false } override fun onResourceReady(resource: Bitmap?, model: Any?, target: Target?, dataSource: DataSource?, isFirstResource: Boolean): Boolean { Log.i(TAG, resource?.width.toString() + "==" + resource?.height) Log.i(TAG, width.toString() + "===" + height + "==" + measuredHeight) var scale = 2f if (resource?.width == width) { scale = height.toFloat().div(resource?.height) } else if (resource?.height == height) { scale = width.toFloat().div(resource?.width) } findViewById(R.id.zoom_view).run { scaleX = scale scaleY = scale setDefaultScale(scale) } return false } }).into(img) } public fun reset(){ findViewById(R.id.zoom_view)?.reset() } interface Result { fun success(filpath: String) fun error(t: Throwable?) } /* * filePath 可以唯空 空就是默认值 * */ fun doScreenShot(filePath: String?, width:Int,height:Int,result: Result) { ktIO { this.isDrawingCacheEnabled = true this.buildDrawingCache() val bitmap = Bitmap.createBitmap(this.drawingCache) if (bitmap != null) { val scaleX = width / bitmap.width.toFloat() val scaleY = height / bitmap.height.toFloat() var matrix=Matrix() matrix.postScale(scaleX,scaleY); val createBitmap = Bitmap.createBitmap( bitmap,0,0,bitmap.width,bitmap.height,matrix,true) saveBitmap(createBitmap, filePath, result) this.destroyDrawingCache() } } } @SuppressLint("WrongThread") @Throws(IOException::class) private fun saveBitmap(bmp: Bitmap, filePath: String?, result: Result) { try { var dirPath = filePath ?: context.getFilesDir().path + "/zoomimg/" val childFolder = File(dirPath) if (!childFolder.exists() || childFolder.isFile) { try { childFolder.mkdirs(); } catch (e: java.lang.Exception) { } } var zoomFile = File(dirPath + "zoomimg" + TimeUtils.getCurrentTime() + Random().nextInt(99999) + ".jpeg") if (zoomFile.exists()) { zoomFile.delete() } try { zoomFile.createNewFile() } catch (e: java.lang.Exception) { } val fOut: OutputStream = FileOutputStream(zoomFile) bmp.compress(Bitmap.CompressFormat.JPEG, 60, fOut) //将bg输出至文件 fOut.flush() fOut.close() result?.success(zoomFile?.path) // do not forget to close thestream } catch (e: java.lang.Exception) { result?.error(e) } } init { init() } }

使用方法loadImgUrl来加载想要操作 放大缩小旋转的图片 

doScreenShot方法用来获取截图

reset方法用来重置