Android系列之照相功能的实现

xml配置文件：（一定要写上，不然那会有bug的）

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

xml布局文件：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout 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="com.zking.laci.android28_vedio.Main3Activity">    <SurfaceView        android:layout_width="match_parent"        android:layout_height="match_parent"        android:id="@+id/sv_main3"        />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="拍照"        android:onClick="takePhoto"        /></RelativeLayout>

java代码：

package com.zking.laci.android28_vedio;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 android.widget.Toast;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.util.Calendar;public class Main3Activity extends AppCompatActivity {    private SurfaceView sv_main3;    private Camera camera;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main3);            sv_main3= (SurfaceView) findViewById(R.id.sv_main3);            sv_main3.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_main3.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();                }            }        });    }}