拍照

在main.xml中：

<LinearLayout

    xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:background="#000000">

  <Button

      android:id="@+id/but"

      android:layout_width="50dp"

      android:layout_height="fill_parent"

      android:background="#3399ff"

      android:textColor="#ffffff"

      android:text="照相"/>

  <SurfaceView

      android:id="@+id/surface"

      android:layout_width="fill_parent"

      android:layout_height="fill_parent"/>

</LinearLayout>

在MyCameraDemo.java中：

package com.li.camera;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import android.annotation.SuppressLint;

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.SurfaceHolder;

import android.view.SurfaceView;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.WindowManager;

import android.widget.Button;

import android.widget.Toast;

public class MyCameraDemo extends Activity {

  private SurfaceView surface = null ;

  private Button but = null ;

  private SurfaceHolder holder = null ;

  private Camera cam = null ;

  private boolean previewRunning =  true ;

  @Override

  public void onCreate(Bundle savedInstanceState) {

     super.onCreate(savedInstanceState);

     super.setContentView(R.layout.main);

     this.but = (Button) super.findViewById(R.id.but) ;

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

    

     this.holder = this.surface.getHolder() ;

     this.holder.addCallback(new MySurfaceViewCallback()) ;

    this.holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS) ;

     this.holder.setFixedSize(500, 350);

    

     this.but.setOnClickListener(new OnClickListenerImpl()) ;

  }

  private class OnClickListenerImpl implements OnClickListener {

     public void onClick(View v) {

       if(MyCameraDemo.this.cam != null) {

         MyCameraDemo.this.cam.autoFocus(new AutoFocusCallbackImpl()) ;

       }

     }

    

  }

  private class MySurfaceViewCallback implements SurfaceHolder.Callback {

     public void surfaceChanged(SurfaceHolder holder, int format, int width,

         int height) {

      

     }

     @SuppressLint("NewApi")

     public void surfaceCreated(SurfaceHolder holder) {

       MyCameraDemo.this.cam = Camera.open(0) ;  // 取得第一个摄像头

       WindowManager manager = (WindowManager) MyCameraDemo.this

            .getSystemService(Context.WINDOW_SERVICE);

       Display display = manager.getDefaultDisplay() ;

       Parameters param = MyCameraDemo.this.cam.getParameters() ;

       param.setPreviewSize(display.getWidth(), display.getHeight()) ;

       param.setPreviewFrameRate(5) ; // 一秒5帧

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

       param.set("jpen-quality", 80) ;

       MyCameraDemo.this.cam.setParameters(param) ;

       try {

         MyCameraDemo.this.cam.setPreviewDisplay(MyCameraDemo.this.holder) ;

       } catch (IOException e) {

       }

       MyCameraDemo.this.cam.startPreview() ;  // 进行预览

       MyCameraDemo.this.previewRunning = true ; // 已经开始预览

     }

     public void surfaceDestroyed(SurfaceHolder holder) {

       if(MyCameraDemo.this.cam != null) {

         if(MyCameraDemo.this.previewRunning) {

            MyCameraDemo.this.cam.stopPreview() ; // 停止预览

            MyCameraDemo.this.previewRunning = false ;

         }

         MyCameraDemo.this.cam.release() ;

       }

     }

    

  }

  private class AutoFocusCallbackImpl implements AutoFocusCallback {

     public void onAutoFocus(boolean success, Camera camera) {

       if(success) { // 成功

         MyCameraDemo.this.cam.takePicture(sc, pc, jpgcall) ;

       }

     }

    

  }

  private PictureCallback jpgcall = new PictureCallback() {

     public void onPictureTaken(byte[] data, Camera camera) {  // 保存图片的操作

       Bitmap bmp = BitmapFactory.decodeByteArray(data, 0, data.length);

       String fileName = Environment.getExternalStorageDirectory()

            .toString()

            + File.separator

            + "liyewenphoto"

            + File.separator

            + "LYW" + System.currentTimeMillis() + ".jpg";

       File file = new File(fileName) ;

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

         file.getParentFile().mkdirs() ;  // 创建文件夹

       }

       try {

         BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file)) ;

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

         bos.flush() ;

         bos.close() ;

         Toast.makeText(MyCameraDemo.this,

              "拍照成功，照片已保存在" + fileName + "文件之中！", Toast.LENGTH_SHORT)

              .show();

       } catch (Exception e) {

         Toast.makeText(MyCameraDemo.this,

              "拍照失败！", Toast.LENGTH_SHORT)

              .show();

       }

       MyCameraDemo.this.cam.stopPreview() ;

       MyCameraDemo.this.cam.startPreview() ;

     }

    

  } ;

  private ShutterCallback sc = new ShutterCallback(){

     public void onShutter() {

       // 按下快门之后进行的操作

     }

  } ;

  private PictureCallback pc = new PictureCallback() {

     public void onPictureTaken(byte[] data, Camera camera) {

      

     }

    

  } ;

}

修改AndroidManifest.xml中：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.li.camera"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="15" />

    <application

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name=".MyCameraDemo"

            android:label="@string/title_activity_my_camera_demo"

            android:screenOrientation="landscape">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

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

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

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

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

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

</manifest>