Android使用網路攝影機拍照

//main.xml如下:<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <SurfaceView        android:id="@+id/surfaceView"        android:layout_width="fill_parent"        android:layout_height="fill_parent"    /></LinearLayout>//MainActivity如下:package com.bravesoft;import java.io.File;import java.io.FileOutputStream;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.Bitmap.CompressFormat;import android.graphics.BitmapFactory;import android.graphics.PixelFormat;import android.hardware.Camera;import android.hardware.Camera.Parameters;import android.hardware.Camera.PictureCallback;import android.os.Bundle;import android.os.Environment;import android.view.Display;import android.view.KeyEvent;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.Window;import android.view.WindowManager;/** * 注意許可權 *  <uses-permission android:name="android.permission.CAMERA"/>   <!-- 在SDCard中建立與刪除檔案許可權 -->   <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>   <!-- 往SDCard寫入資料許可權 -->   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> * @author Administrator * */public class TestCameraActivity extends Activity {private SurfaceView surfaceView;private Camera camera;private boolean isPriview;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);// 去掉標題列this.requestWindowFeature(Window.FEATURE_NO_TITLE);// 全螢幕顯示getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);// 全螢幕顯示setContentView(R.layout.main);surfaceView = (SurfaceView) findViewById(R.id.surfaceView);surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);surfaceView.getHolder().setFixedSize(176, 144);// 設定解析度surfaceView.getHolder().addCallback(new SurfaceHolderCallbackImpl());// SurfaceView的回調}class SurfaceHolderCallbackImpl implements SurfaceHolder.Callback {@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {}@Overridepublic void surfaceCreated(SurfaceHolder holder) {WindowManager windowManager = (WindowManager) TestCameraActivity.this.getSystemService(WINDOW_SERVICE);Display display = windowManager.getDefaultDisplay();camera = Camera.open();// 開啟網路攝影機Parameters params = camera.getParameters();params.setPreviewSize(display.getWidth(), display.getHeight());// 設定預覽照片的大小params.setPreviewFrameRate(5);// 網路攝影機每秒捕獲的照片數量.此為每秒鐘5個畫面params.setPictureFormat(PixelFormat.JPEG);// 設定照片的輸出格式params.set("jpeg-quality", 85);// 設定照片品質params.setPictureSize(display.getWidth(), display.getHeight());// 設定照片的大小try {camera.setParameters(params);// 網路攝影機設定參數camera.setPreviewDisplay(holder);// 設定網路攝影機使用的SurfaceViewcamera.startPreview();// 網路攝影機開啟預覽isPriview = true;} catch (Exception e) {e.printStackTrace();}}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {if (camera != null) {if (isPriview) {// 如果在預覽camera.stopPreview();// 停止預覽isPriview = false;}camera.release();// 釋放掉網路攝影機}}}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {// 重寫Activity的方法if (camera != null && event.getRepeatCount() == 0) {// event.getRepeatCount()按鍵的重複次數.重複次數=0,表示只按了一下switch (keyCode) {// case KeyEvent.KEYCODE_SEARCH://搜尋按鍵// camera.autoFocus(null);//自動對焦.此為自動對焦的回調方法.可以為空白// return true;case KeyEvent.KEYCODE_CAMERA:// 拍照鍵case KeyEvent.KEYCODE_SEARCH:// SEARCH鍵.按下這兩個鍵的時候執行拍照camera.takePicture(null, null, null, new PictureCallbackImpl());// 拍照.且拍照後調用TakePictureCallback回呼函數來處理照片return true;}}return super.onKeyDown(keyCode, event);}class PictureCallbackImpl implements PictureCallback {// 拍照後的回調處理@Overridepublic void onPictureTaken(byte[] data, Camera camera) {Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);File file = new File(Environment.getExternalStorageDirectory(),System.currentTimeMillis() + ".jpg");try {FileOutputStream outputStream = new FileOutputStream(file);bitmap.compress(CompressFormat.JPEG, 100, outputStream);// 100是無損壓縮outputStream.close();camera.startPreview();// 拍照後,網路攝影機再次開始預覽.否則出現螢幕不動的情況} catch (Exception e) {e.printStackTrace();}}}}