Android Jetpack之CameraX使用

参考：

https://developer.android.google.cn/training/camerax

https://codelabs.developers.google.com/codelabs/camerax-getting-started/#0

代码Github:https://github.com/345166018/HxJetpack/tree/master/HxCameraX

添加Gradle依赖

 	//material组件
    implementation 'com.google.android.material:material:1.1.0-alpha10'

    //camera
    implementation 'androidx.camera:camera-core:1.0.0-alpha04'
    implementation 'androidx.camera:camera-camera2:1.0.0-alpha04'
    implementation 'androidx.camera:camera-view:1.0.0-alpha01'
    implementation 'androidx.camera:camera-extensions:1.0.0-alpha01'

    //gesture imageview
    implementation 'com.github.chrisbanes:PhotoView:2.3.0'

    //图片加载
    implementation 'com.github.bumptech.glide:glide:4.9.0'
    implementation 'jp.wasabeef:glide-transformations:4.0.0'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.9.0'

    //视频播放组件
    implementation 'com.google.android.exoplayer:exoplayer-core:2.10.4'
    implementation 'com.google.android.exoplayer:exoplayer-dash:2.10.4'
    implementation 'com.google.android.exoplayer:exoplayer-ui:2.10.4'

CameraX需要一些Java 8的方法，app的build.gradle的buildTypes之后添加以下内容：

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

权限

    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.RECORD_AUDIO" />

    private static final String[] PERMISSIONS = new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.RECORD_AUDIO};
    private ArrayList<String> deniedPermission = new ArrayList<>();
    
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
  		...
        ActivityCompat.requestPermissions(this, PERMISSIONS, PERMISSION_CODE);
		...
}

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == PERMISSION_CODE) {
            deniedPermission.clear();
            for (int i = 0; i < permissions.length; i++) {
                String permission = permissions[i];
                int result = grantResults[i];
                if (result != PackageManager.PERMISSION_GRANTED) {
                    deniedPermission.add(permission);
                }
            }

            if (deniedPermission.isEmpty()) {
                bindCameraX();
            } else {
                new AlertDialog.Builder(this)
                        .setMessage(getString(R.string.capture_permission_message))
                        .setNegativeButton(getString(R.string.capture_permission_no), new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                dialog.dismiss();
                                CaptureActivity.this.finish();
                            }
                        })
                        .setPositiveButton(getString(R.string.capture_permission_ok), new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                String[] denied = new String[deniedPermission.size()];
                                ActivityCompat.requestPermissions(CaptureActivity.this, deniedPermission.toArray(denied), PERMISSION_CODE);
                            }
                        }).create().show();
            }
        }
    }

配置CameraX

 @SuppressLint("RestrictedApi")
    private void bindCameraX() {
        CameraX.unbindAll();
        PreviewConfig config = new PreviewConfig.Builder()
                //前后摄像头
                .setLensFacing(mLensFacing)
                //旋转角度
                .setTargetRotation(rotation)
                //分辨率
                .setTargetResolution(resolution)
                //宽高比
                .setTargetAspectRatio(rational)
                .build();
        preview = new Preview(config);

        imageCapture = new ImageCapture(new ImageCaptureConfig.Builder()
                .setTargetAspectRatio(rational)
                .setTargetResolution(resolution)
                .setLensFacing(mLensFacing)
                .setTargetRotation(rotation).build());

        videoCapture = new VideoCapture(new VideoCaptureConfig.Builder()
                .setTargetRotation(rotation)
                .setLensFacing(mLensFacing)
                .setTargetResolution(resolution)
                .setTargetAspectRatio(rational)
                //视频帧率
                .setVideoFrameRate(25)
                //bit率
                .setBitRate(10440).build());
        preview.setOnPreviewOutputUpdateListener(new Preview.OnPreviewOutputUpdateListener() {
            @Override
            public void onUpdated(Preview.PreviewOutput output) {

                textureView = mBinding.textureView;
                ViewGroup parent = (ViewGroup) textureView.getParent();
                parent.removeView(textureView);
                parent.addView(textureView, 0);

                textureView.setSurfaceTexture(output.getSurfaceTexture());
            }
        });
        CameraX.unbindAll();
        CameraX.bindToLifecycle(this, preview, imageCapture, videoCapture);
    }

    @Override
    protected void onDestroy() {
        CameraX.unbindAll();
        super.onDestroy();
    }

拍照和录像

 @Override
            public void onClick() {
                takingPicture = true;
                File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), System.currentTimeMillis() + ".jpeg");
                mBinding.captureTips.setVisibility(View.INVISIBLE);
                imageCapture.takePicture(file, new ImageCapture.OnImageSavedListener() {
                    @Override
                    public void onImageSaved(@NonNull File file) {
                        onFileSaved(file);
                    }

                    @Override
                    public void onError(@NonNull ImageCapture.UseCaseError useCaseError, @NonNull String message, @Nullable Throwable cause) {
                        showErrorToast(message);
                    }
                });
            }

            @SuppressLint("RestrictedApi")
            @Override
            public void onLongClick() {
                takingPicture = false;
                File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), System.currentTimeMillis() + ".mp4");
                videoCapture.startRecording(file, new VideoCapture.OnVideoSavedListener() {
                    @Override
                    public void onVideoSaved(File file) {
                        onFileSaved(file);
                    }

                    @Override
                    public void onError(VideoCapture.UseCaseError useCaseError, String message, @Nullable Throwable cause) {
                        showErrorToast(message);
                    }
                });
            }

保存和预览

    private void onFileSaved(File file) {
        outputFilePath = file.getAbsolutePath();
        String mimeType = takingPicture ? "image/jpeg" : "video/mp4";
        MediaScannerConnection.scanFile(this, new String[]{outputFilePath}, new String[]{mimeType}, null);
        PreviewActivity.startActivityForResult(this, outputFilePath, !takingPicture, "完成");
    }

预览照片和录像

    private void previewImage(String previewUrl) {
        mPreviewBinding.photoView.setVisibility(View.VISIBLE);
        Glide.with(this).load(previewUrl).into(mPreviewBinding.photoView);
    }

    private void previewVideo(String previewUrl) {
        mPreviewBinding.playerView.setVisibility(View.VISIBLE);
        player = ExoPlayerFactory.newSimpleInstance(this, new DefaultRenderersFactory(this), new DefaultTrackSelector(), new DefaultLoadControl());

        Uri uri = null;
        File file = new File(previewUrl);
        if (file.exists()) {
            DataSpec dataSpec = new DataSpec(Uri.fromFile(file));
            FileDataSource fileDataSource = new FileDataSource();
            try {
                fileDataSource.open(dataSpec);
                uri = fileDataSource.getUri();
            } catch (FileDataSource.FileDataSourceException e) {
                e.printStackTrace();
            }
        } else {
            uri = Uri.parse(previewUrl);
        }

        ProgressiveMediaSource.Factory factory = new ProgressiveMediaSource.Factory(
                new DefaultDataSourceFactory(this, Util.getUserAgent(this, getPackageName())));
        ProgressiveMediaSource mediaSource = factory.createMediaSource(uri);
        player.prepare(mediaSource);
        player.setPlayWhenReady(true);
        mPreviewBinding.playerView.setPlayer(player);
    }