Android之拍照

最新推荐文章于 2024-12-18 22:47:29 发布

原创最新推荐文章于 2024-12-18 22:47:29 发布 · 307 阅读

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简单的给大家讲解一下，安卓如何实现拍照功能吧！

首先先在布局上放一个按钮Button和SurfaceView，设一个id(方法)

接下来就是Java代码

public class CameraActivity extends AppCompatActivity {

    private SurfaceView sv_camera_surface;
    private Camera camera;

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

        sv_camera_surface = (SurfaceView) findViewById(R.id.sv_camera_surface);
        sv_camera_surface.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder holder) {
                //打开摄像头
                camera = Camera.open();

                //打开摄像参数
                Camera.Parameters parameters=camera.getParameters();
                parameters.setPictureFormat(PixelFormat.JPEG);
                parameters.set("jpeg-quality",100);
                camera.setParameters(parameters);

                //开启预览效果
                camera.startPreview();
                //将画面展示到surfaceView
                try {
                    camera.setPreviewDisplay(sv_camera_surface.getHolder());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

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

            }

            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {
                camera.stopPreview();
                camera.release();
            }
        });
    }

    public void takePhoto(View view){
        camera.takePicture(null, null, new Camera.PictureCallback() {
            @Override
            public void onPictureTaken(byte[] data, Camera camera) {
                Bitmap bitmap=BitmapFactory.decodeByteArray(data,0,data.length);

                //时间戳
                Calendar calendar=Calendar.getInstance();
                int year=calendar.get(Calendar.YEAR);
                int month=calendar.get(Calendar.MONTH);
                int day=calendar.get(Calendar.DAY_OF_MONTH);
                try {
                    FileOutputStream fos=new FileOutputStream("/mnt/sdcard/dcim/camera/G160628_"+year+(month+1)+day+"_"+System.currentTimeMillis()+".jpg");
                    //压缩
                    bitmap.compress(Bitmap.CompressFormat.JPEG,85,fos);
                    camera.stopPreview();
                    camera.startPreview();
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }
            }
        });
    }
}

千万记得别忘记配置哦！

<!-- 权限 -->
<uses-permission android:name="android.permission.CAMERA" />