Android 實現全屏截圖、剪裁、分享功能

項目中需要用到 截圖分享 的功能，特此寫下查詢資料過程中的踩坑記錄。
android 26以上，google 官方文檔支持 PixelCopy 實現截圖效果
獲取虛擬導航欄的高度并剪裁圖片
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1、全屏截圖

1.1 踩坑記錄

第一個坑：方法已被棄用

（先前實現的全屏截圖方法，已經在api28及以上棄用）

// View是全屏截圖 **已棄用**View getView = this.getWindow().getDecorView();getView.setDrawingCacheEnabled(true);getView.buildDrawingCache();Bitmap b1 = getView.getDrawingCache();

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第二個坑：能實現全屏截圖，但是 MaterialCardView 圓角顯示失效

//獲取全屏截圖（包括狀態欄、標題欄和底部）val screenView = window.decorViewval bitmap = screenView.drawToBitmap()

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1.2 正確截圖方式

經過查詢資料，終于找到了能正確顯示 MaterialCardView 圓角的截圖方式

val EVENT_SCREENSHOT = 22 //截圖事件private var mediaProjectionManager: MediaProjectionManager? = nullprivate var mediaProjection: MediaProjection? = nullprivate var image: Image? = nullprivate fun takeScreenShot() {mediaProjectionManager = application.getSystemService(Context.MEDIA_PROJECTION_SERVICE) as MediaProjectionManagerstartActivityForResult(mediaProjectionManager!!.createScreenCaptureIntent(), EVENT_SCREENSHOT)}@SuppressLint("WrongConstant")override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {super.onActivityResult(requestCode, resultCode, data)if(requestCode == EVENT_SCREENSHOT_LOCK ||requestCode == EVENT_SCREENSHOT_SHARE){val displayMetrics = resources.displayMetricsval width = displayMetrics.widthPixelsval height = displayMetrics.heightPixelsval mImageReader: ImageReader = ImageReader.newInstance(width, height, PixelFormat.RGBA_8888, 2)mediaProjection = mediaProjectionManager!!.getMediaProjection(resultCode, data!!)val virtualDisplay = mediaProjection!!.createVirtualDisplay("screen-mirror", width, height,displayMetrics.densityDpi, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR, mImageReader.surface, null, null)Handler(Looper.myLooper()!!).postDelayed({try {image = mImageReader.acquireLatestImage()if (image != null) {val planes: Array<Image.Plane> = image!!.planesval buffer: ByteBuffer = planes[0].bufferval width: Int = image!!.widthval height: Int = image!!.heightval pixelStride: Int = planes[0].pixelStrideval rowStride: Int = planes[0].rowStrideval rowPadding = rowStride - pixelStride * widthvar bitmap = Bitmap.createBitmap(width + rowPadding / pixelStride, height, Bitmap.Config.ARGB_8888)bitmap!!.copyPixelsFromBuffer(buffer)bitmap = Bitmap.createScaledBitmap(bitmap, bitmap.width, bitmap.height, false)if (bitmap != null) {if (requestCode == EVENT_SCREENSHOT_SHARE) {cutScreenShotToShare(bitmap)}else if(requestCode == EVENT_SCREENSHOT_LOCK){cutScreenShotToLock(bitmap)}}bitmap.recycle()}} catch (e: Exception) {e.printStackTrace()} finally {image?.close()mImageReader.close()virtualDisplay?.release()//必須代碼，否則出現BufferQueueProducer: [ImageReader] dequeueBuffer: BufferQueue has been abandonedmImageReader.setOnImageAvailableListener(null, null)mediaProjection!!.stop()}}, 100)}}

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android 26以上，google 官方文檔支持 PixelCopy 實現截圖效果

val view = window.decorViewif (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {//獲取layout的位置val location = IntArray(2)view.getLocationInWindow(location)//準備一個bitmap對象，用來將copy出來的區域繪制到此對象中val bitmap = Bitmap.createBitmap(view.width, view.height, Bitmap.Config.ARGB_8888, true)PixelCopy.request(this.window,Rect(location[0], location[1], location[0] + view.width, location[1] + view.height),bitmap, { copyResult ->//如果成功if (copyResult == PixelCopy.SUCCESS) {cutScreenShotToShare(bitmap)}else{Toast.makeText(this, "截圖出現錯誤", Toast.LENGTH_SHORT).show()}}, Handler(Looper.getMainLooper()))}else{takeScreenShotToShare()}

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2、剪裁圖片 （截去狀態欄和標題欄）

private fun cutScreenShot(bitmap: Bitmap) {val screenView = window.decorView//獲取狀態欄高度val frame = Rect()screenView.getWindowVisibleDisplayFrame(frame)val statusbarHeight = frame.top//獲取標題欄高度(toolbar里有menu，需要截掉)val typeValue = TypedValue()theme.resolveAttribute(android.R.attr.actionBarSize, typeValue, true)val toolbarHeight = TypedValue.complexToDimensionPixelSize(typeValue.data, resources.displayMetrics)//獲取屏幕長寬val width = screenView.widthval height = screenView.height//去掉狀態欄和標題欄val screenShot = bitmap.let { Bitmap.createBitmap(it, 0, toolbarHeight + statusbarHeight, width, height - toolbarHeight - statusbarHeight - getVirtualBarHeight()) }if (screenShot != null) {ShotShareUtil(this).shotShare(this, screenShot)}}

獲取虛擬導航欄的高度

//獲取虛擬導航欄的高度private fun getVirtualBarHeight():Int{var height = 0val display = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {display} else {val windowManager = getSystemService(Context.WINDOW_SERVICE) as WindowManagerwindowManager.defaultDisplay}val dm = DisplayMetrics()try {val c = Class.forName("android.view.Display")val method = c.getMethod("getRealMetrics", DisplayMetrics::class.java)method.invoke(display, dm)val displayMetrics = resources.displayMetricsheight = dm.heightPixels - displayMetrics.heightPixels} catch (e:Exception) {e.printStackTrace()}return height}

3、實現分享功能

import android.content.Context import android.content.Intent import android.graphics.Bitmap import android.net.Uri import android.os.Build import androidx.core.content.FileProvider import java.io.File import java.io.FileNotFoundException import java.io.FileOutputStream import java.io.IOExceptionclass ShotShareUtil(context: Context){private val BITMAP_DIR = "${context.getExternalFilesDir(null)?.absolutePath}/BitmapCache"private lateinit var bitmapName:Stringprivate lateinit var bitmapPath:Stringfun shotShare(context: Context,bitmap: Bitmap){bitmapName = "${System.currentTimeMillis()}"bitmapPath = "$BITMAP_DIR/$bitmapName.png"SaveBitmap(bitmap)ShareImage(context, bitmapPath)}private fun ShareImage(context: Context, imagePath: String) {val uri: Urival file = File(imagePath)if (context == null || file == null) {throw NullPointerException()}uri = if (Build.VERSION.SDK_INT >= 24) {FileProvider.getUriForFile(context, "com.example.customlockscreen.fileprovider", file)} else {Uri.fromFile(file)}var intent = Intent(Intent.ACTION_SEND)intent.type = "image/*"intent.putExtra(Intent.EXTRA_STREAM, uri) // 分享的內容intent.putExtra(Intent.EXTRA_SUBJECT,"分享")intent = Intent.createChooser(intent, "分享到：")context.startActivity(intent)}private fun SaveBitmap(bitmap: Bitmap) {try { // 獲取SDCard指定目錄下val sdCardDir = BITMAP_DIRval dirFile = File(sdCardDir) //目錄轉化成文件夾if (!dirFile.exists()) { //如果不存在，那就建立這個文件夾dirFile.mkdirs()}val file = File(sdCardDir, "$bitmapName.png") // 在該目錄下創建圖片if (file.exists()) {file.delete()}file.createNewFile() //創建文件val out = FileOutputStream(file)bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out)out.flush()out.close()} catch (e: FileNotFoundException) {e.printStackTrace()} catch (e: IOException) {e.printStackTrace()}}}

總結

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