Android Media(拍照)

最新推荐文章于 2024-10-25 21:19:04 发布

原创最新推荐文章于 2024-10-25 21:19:04 发布 · 451 阅读

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本文介绍了一个简单的Android应用程序，用于打开设备的摄像头并拍摄照片。该程序通过SurfaceView预览摄像头画面，并允许用户拍照保存到SD卡。代码展示了如何设置摄像头参数、启动预览以及处理图片的保存。

代码实现：

package com.zking.administrator.g160628_android28_playvideo;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Calendar;

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();

                //设置摄像参数
                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();
                }

            }
        });
    }




}