Android使用摄像头拍照

//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;/** * 注意权限 *  <uses-permission android:name="android.permission.CAMERA"/>   <!-- 在SDCard中创建与删除文件权限 -->   <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>   <!-- 往SDCard写入数据权限 -->   <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);// 去掉标题栏this.requestWindowFeature(Window.FEATURE_NO_TITLE);// 全屏幕显示getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);// 全屏幕显示setContentView(R.layout.main);surfaceView = (SurfaceView) findViewById(R.id.surfaceView);surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);surfaceView.getHolder().setFixedSize(176, 144);// 设置分辨率surfaceView.getHolder().addCallback(new SurfaceHolderCallbackImpl());// SurfaceView的回调}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();// 打开摄像头Parameters params = camera.getParameters();params.setPreviewSize(display.getWidth(), display.getHeight());// 设置预览照片的大小params.setPreviewFrameRate(5);// 摄像头每秒捕获的照片数量.此为每秒钟5个画面params.setPictureFormat(PixelFormat.JPEG);// 设置照片的输出格式params.set("jpeg-quality", 85);// 设置照片质量params.setPictureSize(display.getWidth(), display.getHeight());// 设置照片的大小try {camera.setParameters(params);// 摄像头设置参数camera.setPreviewDisplay(holder);// 设置摄像头使用的SurfaceViewcamera.startPreview();// 摄像头开启预览isPriview = true;} catch (Exception e) {e.printStackTrace();}}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {if (camera != null) {if (isPriview) {// 如果在预览camera.stopPreview();// 停止预览isPriview = false;}camera.release();// 释放掉摄像头}}}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {// 重写Activity的方法if (camera != null && event.getRepeatCount() == 0) {// event.getRepeatCount()按键的重复次数.重复次数=0,表示只按了一下switch (keyCode) {// case KeyEvent.KEYCODE_SEARCH://搜索按键// camera.autoFocus(null);//自动对焦.此为自动对焦的回调方法.可以为空// return true;case KeyEvent.KEYCODE_CAMERA:// 拍照键case KeyEvent.KEYCODE_SEARCH:// SEARCH键.按下这两个键的时候执行拍照camera.takePicture(null, null, null, new PictureCallbackImpl());// 拍照.且拍照后调用TakePictureCallback回调函数来处理照片return true;}}return super.onKeyDown(keyCode, event);}class PictureCallbackImpl implements PictureCallback {// 拍照后的回调处理@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是无损压缩outputStream.close();camera.startPreview();// 拍照后,摄像头再次开始预览.否则出现屏幕不动的情况} catch (Exception e) {e.printStackTrace();}}}}
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