Android (拍照功能)

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拍照功能和视频播放用到了一个共同的控件SurfaceView

这一次我们要在XML中配置的东西稍微有点多

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

然后是布局文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="match_parent">    <SurfaceView        android:layout_width="match_parent"        android:layout_height="match_parent"        android:id="@+id/sv_camera_view"        />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="拍照"        android:onClick="takePhoto"        /></LinearLayout>

再是java部分

package com.example.myas_028;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.PixelFormat;import android.hardware.Camera;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;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;/** * Created by Administrator on 2017/7/21 0021. */public class CameraActivity extends AppCompatActivity {    private SurfaceView sv_camera_view;    private Camera camera;    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_camera);        sv_camera_view =(SurfaceView) findViewById(R.id.sv_camera_view);        sv_camera_view.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_view.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.startPreview();                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()+".jsp");                    //压缩                    bitmap.compress(Bitmap.CompressFormat.JPEG,85,fos);                    camera.startPreview();                    camera.startPreview();                } catch (FileNotFoundException e) {                    e.printStackTrace();                }            }        });    }}

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