如何在Android中捕获视图的屏幕截图并将其保存到图库？

在本文中，我们将捕获视图的屏幕快照并将图像存储在图库中。下面提供了一个示例视频，以使您对我们在本文中将要做的事情有个大概的了解。请注意，我们将使用Kotlin语言实施此项目。

分步实施

步骤1：创建一个新项目

要在Android Studio中创建新项目，请参阅如何在Android Studio中创建/启动新项目。请注意，选择Kotlin作为编程语言

步骤2：使用activity_main.xml文件

转到activity_main.xml文件，并参考以下代码。以下是activity_main.xml文件的代码。请注意，它具有一个id为card_View的Material Card视图，我们将在本文中对此视图进行截屏。

步骤3.在清单中添加权限。

转到AndroidManifest.xml文件和以下代码。它具有读取和写入外部存储的两个权限。在应用程序标记中，它具有android：usesCleartextTraffic =“ true”。

步骤4：使用MainActivity.kt文件

转到MainActivity.kt文件，并参考以下代码。下面是MainActivity.kt文件的代码。在代码内部添加了注释，以更详细地了解代码。

科特林

import android.Manifest
import android.content.ContentValues
import android.graphics.Bitmap
import android.graphics.Canvas
import android.net.Uri
import android.os.Build
import android.os.Bundle
import android.os.Environment
import android.provider.MediaStore
import android.util.Log
import android.view.View
import android.widget.Button
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.cardview.widget.CardView
import androidx.core.app.ActivityCompat
import java.io.File
import java.io.FileOutputStream
import java.io.OutputStream
  
class MainActivity : AppCompatActivity() {
  
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
  
        // write permission to access the storage
        ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.WRITE_EXTERNAL_STORAGE), 1)
        ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.READ_EXTERNAL_STORAGE), 1)
  
        // this is the card view whose screenshot
          // we will take in this article
        // get the view using fin view bt id
        val cardView = findViewById(R.id.card_View)
  
        // on click of this button it will capture 
          // screenshot and save into gallery
        val captureButton = findViewById(R.id.btn_capture)
        captureButton.setOnClickListener {
            // get the bitmap of the view using 
              // getScreenShotFromView method it is
            // implemented below
            val bitmap = getScreenShotFromView(cardView)
  
            // if bitmap is not null then 
              // save it to gallery
            if (bitmap != null) {
                saveMediaToStorage(bitmap)
            }
        }
  
    }
  
    private fun getScreenShotFromView(v: View): Bitmap? {
        // create a bitmap object
        var screenshot: Bitmap? = null
        try {
            // inflate screenshot object 
             // with Bitmap.createBitmap it 
              // requires three parameters
            // width and height of the view and
              // the background color
            screenshot = Bitmap.createBitmap(v.measuredWidth, v.measuredHeight, Bitmap.Config.ARGB_8888)
            // Now draw this bitmap on a canvas
            val canvas = Canvas(screenshot)
            v.draw(canvas)
        } catch (e: Exception) {
            Log.e("GFG", "Failed to capture screenshot because:" + e.message)
        }
        // return the bitmap
        return screenshot
    }
  
  
    // this method saves the image to gallery
    private fun saveMediaToStorage(bitmap: Bitmap) {
        // Generating a file name
        val filename = "${System.currentTimeMillis()}.jpg"
  
        // Output stream
        var fos: OutputStream? = null
  
        // For devices running android >= Q
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
            // getting the contentResolver
            this.contentResolver?.also { resolver ->
  
                // Content resolver will process the contentvalues
                val contentValues = ContentValues().apply {
  
                    // putting file information in content values
                    put(MediaStore.MediaColumns.DISPLAY_NAME, filename)
                    put(MediaStore.MediaColumns.MIME_TYPE, "image/jpg")
                    put(MediaStore.MediaColumns.RELATIVE_PATH, Environment.DIRECTORY_PICTURES)
                }
  
                // Inserting the contentValues to
                  // contentResolver and getting the Uri
                val imageUri: Uri? = resolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, contentValues)
  
                // Opening an outputstream with the Uri that we got
                fos = imageUri?.let { resolver.openOutputStream(it) }
            }
        } else {
            // These for devices running on android < Q
            val imagesDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)
            val image = File(imagesDir, filename)
            fos = FileOutputStream(image)
        }
  
        fos?.use {
            // Finally writing the bitmap to the output stream that we opened
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, it)
            Toast.makeText(this , "Captured View and saved to Gallery" , Toast.LENGTH_SHORT).show()
        }
    }
}

输出：

Github仓库在这里

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