实现手机拍照

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拍照实现步骤：
<1>界面使用SurfaceView控件，显示照相机的画面
<2>SurfaceView接受摄像头界面变化的信息
surfaceView.getHolder().addCallback()
<3>重写三个方法
surfaceDestroyed—>当预览界面关闭时，触发
一般在这里执行销毁照相机的操作，释放内存
camera.stopPreview();
camera.release();
camera = null;
surfaceCreated—–>预览界面被创建时，调用
一般在这里打开照相机和设置照相机的一些参数
surfaceChanged—–>当预览界面的格式和大小发生改变时，触发

activity_camera.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.zking.android_25.CameraActivity">    <SurfaceView        android:layout_width="match_parent"        android:layout_height="match_parent"        android:id="@+id/sv"        />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="拍照"        android:onClick="takePhoto"        /></RelativeLayout>

CameraActivity.java

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;public class CameraActivity extends AppCompatActivity {    private SurfaceView sv;    private Camera camera;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_camera);        sv = (SurfaceView) findViewById(R.id.sv);        sv.getHolder().addCallback(new SurfaceHolder.Callback() {            @Override            public void surfaceCreated(SurfaceHolder surfaceHolder) {                //打开照相机                camera = Camera.open();                //设置参数                Camera.Parameters parameters= camera.getParameters();                //设置保存的格式                parameters.setPictureFormat(PixelFormat.JPEG);                parameters.set("jpeg-quality",85);                camera.setParameters(parameters);                //将照相机捕捉的画面展示到SurfaceView                try {                    camera.setPreviewDisplay(sv.getHolder());                    //开启预览                    camera.startPreview();                } catch (IOException e) {                    e.printStackTrace();                }            }            @Override            public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {            }            @Override            public void surfaceDestroyed(SurfaceHolder surfaceHolder) {            }        });    }    public void takePhoto(View view){        //拍照        camera.takePicture(null, null, new Camera.PictureCallback() {            @Override            public void onPictureTaken(byte[] bytes, Camera camera) {                Bitmap bitmap=BitmapFactory.decodeByteArray(bytes,0,bytes.length);                try {                    FileOutputStream fos=new FileOutputStream("/mnt/sdcard/DCIM/camera/Test"+System.currentTimeMillis()+".png");                    bitmap.compress(Bitmap.CompressFormat.PNG,85,fos);                    camera.stopPreview();                    camera.startPreview();                } catch (FileNotFoundException e) {                    e.printStackTrace();                }            }        });    }}

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