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Jetpack之CameraX的使用

 更新時間:2022年11月01日 10:09:26   作者:幸大叔  
CameraX 是Jetpack的一個成員,可以更輕松地開發(fā)相機(jī)應(yīng)用,支持搭載Android 5.0及以上設(shè)備,具有廣泛的設(shè)備兼容性,也可確保各設(shè)備間的一致性,如寬高比、屏幕方向、旋轉(zhuǎn)角度、預(yù)覽大小和圖像大小等

引入依賴

下面,就使用該庫來打造一個簡單的相機(jī)應(yīng)用吧~

首先引入依賴

    def camerax_version = "1.1.0-beta03"
    implementation "androidx.camera:camera-core:${camerax_version}"
    implementation "androidx.camera:camera-camera2:${camerax_version}"
    implementation "androidx.camera:camera-lifecycle:${camerax_version}"
    implementation "androidx.camera:camera-video:${camerax_version}"
    implementation "androidx.camera:camera-view:${camerax_version}"
    implementation "androidx.camera:camera-extensions:${camerax_version}"

預(yù)覽

將 PreviewView 添加到布局中

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <androidx.camera.view.PreviewView
        android:id="@+id/previewView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
    <Button
        android:id="@+id/take"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:text="拍照" />
</RelativeLayout>

獲取 cameraProvider

        val cameraProviderFuture = ProcessCameraProvider.getInstance(this)
        cameraProviderFuture.addListener({
            val cameraProvider = cameraProviderFuture.get()
            bindViewAndLifecycle(cameraProvider)
        }, ContextCompat.getMainExecutor(this))

配置 ImageCapture

    private val imageCapture: ImageCapture by lazy {
        ImageCapture.Builder().build()
    }

bindViewAndLifecycle:綁定視圖和Lifecycle

    private fun bindViewAndLifecycle(cameraProvider: ProcessCameraProvider) {
        val previewView = findViewById<PreviewView>(R.id.previewView)
        val cameraSelector = CameraSelector.Builder()
            //如果是前置,可使用CameraSelector.LENS_FACING_FRONT
            .requireLensFacing(CameraSelector.LENS_FACING_BACK)
            .build()
        val preview = Preview.Builder().build()
        preview.setSurfaceProvider(previewView.surfaceProvider)
        cameraProvider.bindToLifecycle(
            this as LifecycleOwner,
            cameraSelector,
            imageCapture,
            preview
        )
    }

這樣,就完成了相機(jī)的預(yù)覽功能了。

拍攝

實(shí)現(xiàn)拍照功能也很簡單,只需要創(chuàng)建文件,然后調(diào)用imageCapture的takePicture方法。

    private fun takePicture() {
        val path =
            getExternalFilesDir(null)?.absolutePath + File.separator + System.currentTimeMillis() + ".jpg"
        val photoFile = File(path)
        if (!photoFile.exists()) {
            photoFile.createNewFile()
        }
        val fileOptions = ImageCapture.OutputFileOptions.Builder(photoFile).build()
        imageCapture.takePicture(
            fileOptions,
            ContextCompat.getMainExecutor(this),
            object : ImageCapture.OnImageSavedCallback {
                override fun onImageSaved(outputFileResults: ImageCapture.OutputFileResults) {
                    Toast.makeText(this@MainActivity, "保存成功", Toast.LENGTH_SHORT).show()
                }
                override fun onError(exception: ImageCaptureException) {
                    Log.e(tag, "onError message:${exception.message}")
                }
            })
    }

點(diǎn)擊按鈕時調(diào)用此方法即可

        findViewById<Button>(R.id.take).setOnClickListener {
            takePicture()
        }

注意:作為相機(jī)應(yīng)用,可別忘了申請CAMERA權(quán)限哦。

這樣,一個簡單的相機(jī)應(yīng)用就完成啦~

到此這篇關(guān)于Jetpack之CameraX的使用的文章就介紹到這了,更多相關(guān)Jetpack CameraX內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家!

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