[모바일프로그래밍] 9-5 카메라 영상 캡처

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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">

    <FrameLayout
        android:id="@+id/camera_preview"
        android:layout_width="376dp"
        android:layout_height="333dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

    </FrameLayout>

    <Button
        android:id="@+id/button_capture"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Capture"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/camera_preview" />
</androidx.constraintlayout.widget.ConstraintLayout>

 

CameraPreview.java

package com.example.myapplication;

import android.content.Context;
import android.hardware.Camera;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

import java.io.IOException;

class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
    private SurfaceHolder mHolder;
    private Camera mCamera;

    public CameraPreview(Context context, Camera camera) {
        super(context);

        mCamera = camera;

        mHolder = getHolder();
        mHolder.addCallback(this);
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    public void surfaceCreated(SurfaceHolder holder) {
        try {
            mCamera.setPreviewDisplay(holder);
            mCamera.setDisplayOrientation(90);
            mCamera.startPreview();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

    }

    public void surfaceDestroyed(SurfaceHolder holder) {

    }
}

 

MainActivity.java

package com.example.myapplication;

import android.Manifest;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Button;
import android.widget.FrameLayout;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import java.io.File;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;

public class MainActivity extends AppCompatActivity {
    private Camera mCamera;
    private CameraPreview mPreview;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        permissionCheck(Manifest.permission.CAMERA);
        permissionCheck(Manifest.permission.WRITE_EXTERNAL_STORAGE);

        mCamera = getCameraInstance();

        mPreview = new CameraPreview(this, mCamera);
        FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
        preview.addView(mPreview);

        Button captureButton = (Button) findViewById(R.id.button_capture);
        captureButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mCamera.takePicture(null, null, mPicture);
            }
        });
    }

    private Camera.PictureCallback mPicture = new Camera.PictureCallback() {
        private File getDir() {
            File sdDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
            return new File(sdDir, "CameraCapture");
        }

        @Override
        public void onPictureTaken(byte[] bytes, Camera camera) {
            File pictureFileDir = getDir();
            if (!pictureFileDir.exists() && !pictureFileDir.mkdirs()) {
                return;
            }

            SimpleDateFormat dataFormat = new SimpleDateFormat("yyyymmddhhmmss");
            String date = dataFormat.format(new Date());
            String photoFile = "MyPic" + date + ".jpg";
            String filename = pictureFileDir.getPath() + File.separator + photoFile;

            File pictureFile = new File(filename);

            try {
                FileOutputStream fos = new FileOutputStream(pictureFile);
                fos.write(bytes);
                fos.close();
            } catch (Exception error) {

            }
        }
    };

    public static Camera getCameraInstance() {
        Camera c = null;
        try {
            c = Camera.open();
        } catch (Exception e) {

        }
        return c;
    }

    public void permissionCheck(String permissionId) {
        if (ActivityCompat.checkSelfPermission(this, permissionId) != PackageManager.PERMISSION_GRANTED) {
            if (ActivityCompat.shouldShowRequestPermissionRationale(this, permissionId)) {

            }else {
                ActivityCompat.requestPermissions(this, new String[] {permissionId}, 100);
            }
        }
    }
}

 

원래 버튼 위에 있는 프레임레이아웃에 카메라로 비추고 있는 화면이 떠야 하는데 안 뜬다.

버튼을 누르면 지난 실습처럼 앱이 종료된다.

실제 디바이스에 실행을 해봐야 할 것 같다.