android的camera

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Android手机关于Camera的使用，一是拍照，二是摄像，由于Android提供了强大的组件功能，为此对于在Android手机系统上进行Camera的开发，我们可以使用两类方法：一是借助Intent和MediaStroe调用系统Camera App程序来实现拍照和摄像功能，二是根据Camera API自写Camera程序。由于自写Camera需要对Camera API了解很充分，而且对于通用的拍照和摄像应用只需要借助系统Camera App程序就能满足要求了，为此先从调用系统Camera App应用开始来对Android Camera做个简单的使用小结。

1.在androidmanifest.xml中加入权限

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

<uses-featureandroid:name="android.hardware.camera"/>

<uses-featureandroid:name="android.hardware.camera.autofocus"/>

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

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

2.代码书写

//调用摄像头

Button camera=(Button)findViewById(R.id.camera);

camera.setOnClickListener(newOnClickListener() {

@Override

publicvoidonClick(View v) {

// TODO Auto-generated method stub

Intentintent=newIntent(MainActivity.this,Cameradome.class);

startActivity(intent);

}

});

}

跳转类

package com.example.a3;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import android.app.Activity;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.PixelFormat;

import android.hardware.Camera;

import android.hardware.Camera.AutoFocusCallback;

import android.hardware.Camera.Parameters;

import android.hardware.Camera.PictureCallback;

import android.hardware.Camera.ShutterCallback;

import android.os.Bundle;

import android.os.Environment;

import android.view.Display;

import android.view.MotionEvent;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

import android.view.View;

import android.view.ViewGroup;

import android.view.Window;

import android.view.WindowManager;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

publicclassCameradome extendsActivity {

* author杨

private SurfaceViewsurface;

private Buttonpaizhao;

private SurfaceHolderHolder;

private Cameracam;// 导入硬件的包

private Viewlayout1, layout2;

privateint i = 0;

privateboolean focus =false;

privateboolean previewRunning =true;//判断回调

privateint count = 0;//计算点击的次数

privatelong firsttime;

privatelong lasttime;

@Override

protectedvoid onCreate(BundlesavedInstanceState) {

super.onCreate(savedInstanceState);

requestWindowFeature(Window.FEATURE_NO_TITLE);

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,

WindowManager.LayoutParams.FLAG_FULLSCREEN);//全屏显示

setContentView(R.layout.activity_camera);

paizhao = (Button)findViewById(R.id.camera);

surface = (SurfaceView)findViewById(R.id.surface);

layout1 = findViewById(R.id.buttonlayout);

layout2 = findViewById(R.id.stoplayout);

Holder =surface.getHolder();

Holder.~~setType~~(SurfaceHolder.~~SURFACE_TYPE_PUSH_BUFFERS~~);//增加缓冲区处理

Holder.setKeepScreenOn(true);//保持持续拍照

Holder.addCallback(newMySurfaceViewCallback());//添加操作

Holder.setFixedSize(1280,720);//设置像素

this.paizhao.setOnClickListener(new onclicklistener());

}

@Override

publicbooleanonTouchEvent(MotionEvent event) {

//TODO Auto-generated method stub

if (event.getAction() ==MotionEvent.ACTION_DOWN) {

if (firsttime != 0 && System.currentTimeMillis()-firsttime> 500) {

count = 0;

}

count++;

if (count == 1) {

firsttime = System.currentTimeMillis();

// 单击

layout1.setVisibility(ViewGroup.VISIBLE);//显示，显示为0不显示为8

Toast.makeText(this,"对焦", Toast.LENGTH_SHORT).show();

cam.autoFocus(newAutoFocusCallbackimpl());//聚焦 focus = false;

}elseif(count== 2) {

lasttime = System.currentTimeMillis();

if (lasttime -firsttime < 500) {

// 双击

layout1.setVisibility(ViewGroup.GONE);

Toast.makeText(this,"double Touch",1).show();

}

count = 0;

firsttime = 0;

lasttime = 0;

}

returntrue;

}

publicvoid changecamera(View v) {

//换摄像头

if (i == 0) {

i = 1;

}else{

i = 0;

}

cam.stopPreview();//停掉原来摄像头的预览

cam.release();//释放资源

cam =null;//取消原来摄像头

cam = Camera.open(i);//打开当前选中的摄像头

try {

cam.setPreviewDisplay(Holder);//通过surfaceview显示取景画面

}catch(IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

cam.startPreview();//开始预览

previewRunning =true;

* cam.stopPreview();//停止预览

* layout1.setVisibility(ViewGroup.GONE);//显示，显示为0不显示为8

* layout2.setVisibility(ViewGroup.VISIBLE);//显示，显示为0不显示为8

}

privateclass onclicklistener implements OnClickListener{

//拍照

@Override

publicvoid onClick(View v) {

// TODO Auto-generated method stub

if (cam !=null) {

cam.autoFocus(newAutoFocusCallbackimpl());

if (focus ==true) {

cam.takePicture(sc, pc, jpgcall);

focus = false;

}

// 操作

privateclass MySurfaceViewCallback implementsSurfaceHolder.Callback {

@Override

publicvoidsurfaceCreated(SurfaceHolder holder) {

// TODO Auto-generated method stub

// 预览打开camera

cam = Camera.open(i);//取得后摄像头

WindowManagermanager = (WindowManager) Cameradome.this

.getSystemService(Context.WINDOW_SERVICE);//取得手机的宽度和高度进行内容填充

Displaydisplay = manager.getDefaultDisplay();//通过display得到相机的一些屏幕参数

Parametersparam = cam.getParameters();

param.setPreviewSize(display.~~getWidth~~(),display.~~getHeight~~());//设置预览大小

param.~~setPreviewFrameRate~~(5);//一秒5帧帧数越高越清晰；

param.setPictureFormat(PixelFormat.~~JPEG~~);//图片形式

param.set("jpen-quality",85);//图片质量

cam.setParameters(param);

try {

cam.setPreviewDisplay(Holder);

}catch(IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

cam.startPreview();// 进行预览

previewRunning = true;

}

@Override

publicvoidsurfaceChanged(SurfaceHolder holder,int format, int width,

int height) {

// TODO Auto-generated method stub

}

@Override

publicvoidsurfaceDestroyed(SurfaceHolder holder) {

// TODO Auto-generated method stub

if (cam !=null) {

if (previewRunning) {

cam.stopPreview();// 停止预览

previewRunning = false;

}

cam.release();// 释放摄像头

}

privateclass AutoFocusCallbackimpl implementsAutoFocusCallback {

@Override

publicvoid onAutoFocus(boolean success,android.hardware.Camera camera) {

// TODO Auto-generated method stub

if (success) {

// 对焦成功

focus = true;

// cam.takePicture(sc, pc, jpgcall);//拍照

}

private PictureCallbackjpgcall = new PictureCallback() {

@Override

publicvoid onPictureTaken(byte[] data,android.hardware.Camera camera) {

// TODO Auto-generated method stub

// 图片存储操作

Bitmapbmp = BitmapFactory.decodeByteArray(data, 0, data.length);

StringfileName = Environment.getExternalStorageDirectory()

.toString()

+File.separator

+"mldnphoto"

+File.separator

+"MLDN_"+ System.currentTimeMillis() +".jpg";// +System.currentTimeMillis()

// 获取系统时间

Filefile = newFile(fileName);

if(!file.getParentFile().exists()) {

file.getParentFile().mkdirs();//创建文件夹

}

try {

BufferedOutputStreambos =newBufferedOutputStream(

newFileOutputStream(file));

bmp.compress(Bitmap.CompressFormat.JPEG, 80, bos);//向缓冲区之中压缩图片

bos.flush();

bos.close();

Toast.makeText(Cameradome.this,

"拍照成功，照片保存在" + fileName +"文件夹中",1).show();

}catch(FileNotFoundException e) {

// TODO Auto-generated catch block

Toast.makeText(Cameradome.this,"拍照失败",1).show();

e.printStackTrace();

}catch(IOException e) {

// TODO Auto-generated catch block

Toast.makeText(Cameradome.this,"拍照失败",1).show();

e.printStackTrace();

}

Cameradome.this.cam.stopPreview();

Cameradome.this.cam.startPreview();

}

};

private ShutterCallbacksc = new ShutterCallback() {

@Override

publicvoid onShutter() {

// TODO Auto-generated method stub

// 按下快门的操作

}

};

private PictureCallbackpc = new PictureCallback() {

@Override

publicvoid onPictureTaken(byte[] data,android.hardware.Camera camera) {

// TODO Auto-generated method stub

}

};

}

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