Add WatermarkCameraActivity with timestamp watermark and development plan
This commit is contained in:
xiajiid
@@ -30,6 +30,10 @@
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android:name=".SimpleCameraActivity"
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android:exported="false"
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android:screenOrientation="portrait" />
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<activity
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android:name=".WatermarkCameraActivity"
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android:exported="false"
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android:screenOrientation="portrait" />
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</application>
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</manifest>
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@@ -9,8 +9,8 @@ class MainActivity : AppCompatActivity() {
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super.onCreate(savedInstanceState)
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setContentView(R.layout.activity_main)
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// 启动极简相机Activity
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startActivity(Intent(this, SimpleCameraActivity::class.java))
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// 启动带水印相机Activity
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startActivity(Intent(this, WatermarkCameraActivity::class.java))
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finish() // 关闭MainActivity，避免返回键回到空白页面
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}
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}
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@@ -138,8 +138,12 @@ class SimpleCameraActivity : AppCompatActivity() {
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ContextCompat.getMainExecutor(this),
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object : ImageCapture.OnImageSavedCallback {
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override fun onImageSaved(outputFileResults: ImageCapture.OutputFileResults) {
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val savedUri = outputFileResults.savedUri ?: return
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val msg = "照片已保存: ${savedUri.lastPathSegment}"
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val savedUri = outputFileResults.savedUri
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val msg = if (savedUri != null) {
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"照片已保存: ${savedUri.lastPathSegment}"
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} else {
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"照片保存成功"
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}
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Toast.makeText(baseContext, msg, Toast.LENGTH_SHORT).show()
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Log.d(TAG, msg)
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}
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248
app/src/main/java/com/example/app/WatermarkCameraActivity.kt
Normal file
248
app/src/main/java/com/example/app/WatermarkCameraActivity.kt
Normal file
@@ -0,0 +1,248 @@
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package com.example.app
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import android.Manifest
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import android.content.ContentValues
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import android.content.pm.PackageManager
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import android.graphics.Bitmap
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import android.graphics.BitmapFactory
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import android.graphics.Canvas
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import android.graphics.Color
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import android.graphics.Paint
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import android.graphics.Typeface
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import android.net.Uri
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import android.os.Build
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import android.os.Bundle
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import android.provider.MediaStore
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import android.util.Log
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import android.widget.Toast
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import androidx.appcompat.app.AppCompatActivity
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import androidx.camera.core.CameraSelector
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import androidx.camera.core.ImageCapture
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import androidx.camera.core.ImageCaptureException
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import androidx.camera.core.Preview
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import androidx.camera.lifecycle.ProcessCameraProvider
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import androidx.camera.view.PreviewView
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import androidx.core.app.ActivityCompat
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import androidx.core.content.ContextCompat
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import com.google.android.material.floatingactionbutton.FloatingActionButton
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import java.io.OutputStream
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import java.text.SimpleDateFormat
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import java.util.*
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import java.util.concurrent.ExecutorService
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import java.util.concurrent.Executors
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class WatermarkCameraActivity : AppCompatActivity() {
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companion object {
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private const val TAG = "WatermarkCamera"
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private const val REQUEST_CODE_PERMISSIONS = 10
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private val REQUIRED_PERMISSIONS = arrayOf(
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Manifest.permission.CAMERA
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)
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}
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private lateinit var viewFinder: PreviewView
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private lateinit var captureButton: FloatingActionButton
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private var imageCapture: ImageCapture? = null
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private lateinit var cameraExecutor: ExecutorService
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private var cameraProvider: ProcessCameraProvider? = null
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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setContentView(R.layout.activity_simple_camera)
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// 初始化视图
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viewFinder = findViewById(R.id.viewFinder)
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captureButton = findViewById(R.id.captureButton)
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// 初始化线程池
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cameraExecutor = Executors.newSingleThreadExecutor()
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// 请求权限
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if (allPermissionsGranted()) {
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startCamera()
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} else {
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ActivityCompat.requestPermissions(
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this, REQUIRED_PERMISSIONS, REQUEST_CODE_PERMISSIONS
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)
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}
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// 设置拍照按钮点击监听器
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captureButton.setOnClickListener { takePhoto() }
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}
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override fun onDestroy() {
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super.onDestroy()
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cameraExecutor.shutdown()
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cameraProvider?.unbindAll()
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}
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private fun allPermissionsGranted() = REQUIRED_PERMISSIONS.all {
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ContextCompat.checkSelfPermission(baseContext, it) == PackageManager.PERMISSION_GRANTED
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}
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private fun startCamera() {
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val cameraProviderFuture = ProcessCameraProvider.getInstance(this)
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cameraProviderFuture.addListener({
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try {
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cameraProvider = cameraProviderFuture.get()
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// 预览
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val preview = Preview.Builder()
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.build()
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.also {
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it.setSurfaceProvider(viewFinder.surfaceProvider)
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}
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imageCapture = ImageCapture.Builder()
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.setCaptureMode(ImageCapture.CAPTURE_MODE_MINIMIZE_LATENCY)
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.build()
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val cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA
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cameraProvider?.unbindAll()
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cameraProvider?.bindToLifecycle(
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this, cameraSelector, preview, imageCapture
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)
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Log.d(TAG, "相机启动成功")
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} catch (e: Exception) {
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Log.e(TAG, "相机初始化失败: ${e.message}", e)
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Toast.makeText(this, "相机启动失败: ${e.message}", Toast.LENGTH_LONG).show()
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finish()
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}
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}, ContextCompat.getMainExecutor(this))
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}
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private fun takePhoto() {
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val imageCapture = this.imageCapture ?: run {
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Toast.makeText(this, "相机未准备好", Toast.LENGTH_SHORT).show()
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return
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}
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val timestamp = SimpleDateFormat("yyyyMMdd_HHmmss", Locale.getDefault()).format(Date())
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val contentValues = ContentValues().apply {
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put(MediaStore.MediaColumns.DISPLAY_NAME, "巡检_$timestamp")
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put(MediaStore.MediaColumns.MIME_TYPE, "image/jpeg")
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
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put(MediaStore.MediaColumns.RELATIVE_PATH, "Pictures/LogCam")
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}
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}
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val contentResolver = contentResolver
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val uri = contentResolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, contentValues)
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if (uri == null) {
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Toast.makeText(this, "创建文件失败", Toast.LENGTH_SHORT).show()
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return
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}
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val outputOptions = ImageCapture.OutputFileOptions.Builder(contentResolver, uri, contentValues).build()
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imageCapture.takePicture(
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outputOptions,
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ContextCompat.getMainExecutor(this),
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object : ImageCapture.OnImageSavedCallback {
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override fun onImageSaved(outputFileResults: ImageCapture.OutputFileResults) {
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val savedUri = outputFileResults.savedUri
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if (savedUri != null) {
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// 添加水印
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addWatermarkToImage(savedUri)
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val msg = "照片已保存并添加水印: ${savedUri.lastPathSegment}"
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Toast.makeText(baseContext, msg, Toast.LENGTH_SHORT).show()
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Log.d(TAG, msg)
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} else {
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Toast.makeText(baseContext, "照片保存成功", Toast.LENGTH_SHORT).show()
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Log.d(TAG, "照片保存成功")
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}
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}
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override fun onError(exception: ImageCaptureException) {
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Log.e(TAG, "拍照失败: ${exception.message}", exception)
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Toast.makeText(baseContext, "拍照失败: ${exception.message}", Toast.LENGTH_LONG).show()
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}
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}
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)
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}
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private fun addWatermarkToImage(imageUri: Uri) {
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try {
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// 读取图片
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val inputStream = contentResolver.openInputStream(imageUri)
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val originalBitmap = BitmapFactory.decodeStream(inputStream)
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inputStream?.close()
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if (originalBitmap == null) {
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Log.e(TAG, "无法读取图片: $imageUri")
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return
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}
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// 添加水印
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val watermarkedBitmap = addWatermark(originalBitmap)
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// 保存回原文件
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val outputStream: OutputStream? = contentResolver.openOutputStream(imageUri, "w")
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if (outputStream != null) {
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watermarkedBitmap.compress(Bitmap.CompressFormat.JPEG, 90, outputStream)
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outputStream.close()
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Log.d(TAG, "水印添加成功: $imageUri")
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} else {
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Log.e(TAG, "无法写入图片: $imageUri")
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}
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// 回收位图
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originalBitmap.recycle()
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watermarkedBitmap.recycle()
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} catch (e: Exception) {
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Log.e(TAG, "添加水印失败: ${e.message}", e)
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}
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}
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private fun addWatermark(originalBitmap: Bitmap): Bitmap {
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val timestamp = SimpleDateFormat("yyyy年-MM月-dd日 HH:mm:ss", Locale.getDefault()).format(Date())
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// 创建可修改的位图副本
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val mutableBitmap = originalBitmap.copy(Bitmap.Config.ARGB_8888, true)
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val canvas = Canvas(mutableBitmap)
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// 创建水印画笔
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val paint = Paint().apply {
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color = Color.WHITE
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textSize = 48f
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typeface = Typeface.DEFAULT_BOLD
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setShadowLayer(5f, 0f, 0f, Color.BLACK)
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}
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// 计算文字尺寸
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val textWidth = paint.measureText(timestamp)
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val textHeight = paint.descent() - paint.ascent()
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// 计算水印位置（左下角，留边距）
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val margin = 20f
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val x = margin
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val y = mutableBitmap.height - textHeight - margin
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// 绘制水印
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canvas.drawText(timestamp, x, y, paint)
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return mutableBitmap
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}
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override fun onRequestPermissionsResult(
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requestCode: Int,
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permissions: Array<String>,
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grantResults: IntArray
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) {
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super.onRequestPermissionsResult(requestCode, permissions, grantResults)
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if (requestCode == REQUEST_CODE_PERMISSIONS) {
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if (allPermissionsGranted()) {
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startCamera()
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} else {
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Toast.makeText(this, "相机权限被拒绝，应用无法使用相机功能", Toast.LENGTH_LONG).show()
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finish()
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}
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}
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}
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}
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