在main.xml布局文件添加用于显示取景画面的SurfaceView 控件：
<SurfaceView android:layout_width="fill_parent" android:layout_height="240dip" android:id="@+id/surfaceView" />
SurfaceView surfaceView = (SurfaceView)this.findViewById(R.id.surfaceView);
surfaceView.getHolder().setFixedSize(176, 144); //设置分辨率
/*下面设置Surface不维护自己的缓冲区，而是等待屏幕的渲染引擎将内容推送到用户面前*/
surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
Camera camera = Camera.open();
WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
Camera.Parameters parameters = camera.getParameters();
parameters.setPreviewSize(display.getWidth(), display.getHeight());//设置预览照片的大小
parameters.setPreviewFrameRate(3);//每秒3帧
parameters.setPictureFormat(PixelFormat.JPEG);//设置照片的输出格式
parameters.set("jpeg-quality", 85);//照片质量
parameters.setPictureSize(display.getWidth(), display.getHeight());//设置照片的大小
camera.setParameters(parameters);
camera.setPreviewDisplay(surfaceView.getHolder());//通过SurfaceView显示取景画面
camera.startPreview();//开始预览
camera.autoFocus(null);//自动对焦
camera.takePicture(null, null, null, jpegCallback);//拍照片
camera.stopPreview();//停止预览
camera.release();//释放摄像头
AndroidManifest.xml
<? xml version="1.0" encoding="utf-8" ?>
< manifest xmlns:android ="http://schemas.android.com/apk/res/android"
package ="com.takepic"
android:versionCode ="1"
android:versionName ="1.0" >
< uses-sdk android:minSdkVersion ="7" />
< application android:icon ="@drawable/icon" android:label ="@string/app_name" >
<!-- 手机屏幕横向显示 -->
< activity android:name =".TakePicActivity"
android:label ="@string/app_name" android:screenOrientation ="landscape" >
< intent-filter >
< action android:name ="android.intent.action.MAIN" />
< category android:name ="android.intent.category.LAUNCHER" />
</ intent-filter >
</ activity >
</ application >
<!-- 增加摄像头的访问权限 -->
< 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" />
</ manifest >
main.xml
<? xml version="1.0" encoding="utf-8" ?>
< LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
android:orientation ="vertical"
android:layout_width ="fill_parent"
android:layout_height ="fill_parent"
>
< SurfaceView
android:layout_width ="fill_parent"
android:layout_height ="fill_parent"
android:id ="@+id/surfaceview"
/>
</ LinearLayout >
TakePicActivity
package com.takepic;
import java.io.File;
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.graphics.Bitmap.CompressFormat;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.Display;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;
import android.view.WindowManager;
import android.view.SurfaceHolder.Callback;
public class TakePicActivity extends Activity {
private final static String TAG = " TakePicActivity " ;
private SurfaceView surfaceView;
private Camera camera;
private boolean preview = false ;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
Window window = getWindow();
requestWindowFeature(Window.FEATURE_NO_TITLE); // 没有标题
window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN); // 设置全屏
window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); // 高亮
setContentView(R.layout.main);
surfaceView = (SurfaceView) this .findViewById(R.id.surfaceview);
/* 下面设置Surface不维护自己的缓冲区，而是等待屏幕的渲染引擎将内容推送到用户面前 */
surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
surfaceView.getHolder().setFixedSize( 176 , 144 ); // 设置分辨率
}
@Override
public boolean onKeyDown( int keyCode, KeyEvent event) {
if (camera != null && event.getRepeatCount() == 0 ){ // 按单次
switch (keyCode) {
case KeyEvent.KEYCODE_SEARCH:
camera.autoFocus( null ); // 自动对焦
break ;
case KeyEvent.KEYCODE_CAMERA: // 拍照键
case KeyEvent.KEYCODE_DPAD_CENTER: // 确认键
camera.takePicture( null , null , new TackPicCallBack());
break ;
default :
break ;
}
}
return true ;
}
private final class TackPicCallBack implements PictureCallback{
@Override
public void onPictureTaken( byte [] data, Camera camera) {
FileOutputStream stream = null ;
try {
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0 , data.length);
File file = new File(Environment.getExternalStorageDirectory(),System.currentTimeMillis() + " .jpg " );
stream = new FileOutputStream(file);
bitmap.compress(CompressFormat.JPEG, 100 , stream);
// 处理完照片继续预览
camera.stopPreview();
camera.startPreview();
} catch (Exception e) {
Log.i(TAG, e.getMessage());
} finally {
if (stream != null ){
try {
stream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
private final class SurfaceViewCallBack implements Callback{
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
try {
camera = Camera.open();
Camera.Parameters parameters = camera.getParameters();
WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
parameters.setPreviewSize(display.getWidth(), display.getHeight()); // 设置预览照片的大小
parameters.setPreviewFrameRate( 3 ); // 每秒3帧
parameters.setPictureFormat(PixelFormat.JPEG); // 设置照片的输出格式
parameters.set( " jpeg-quality " , 85 ); // 照片质量 最高质量可以设置为100
parameters.setPictureSize(display.getWidth(), display.getHeight()); // 设置照片的大小 如果要拍的大就设置大一些
camera.setParameters(parameters);
camera.setPreviewDisplay(surfaceView.getHolder()); // 通过SurfaceView显示取景画面
camera.startPreview(); // 开始预览
preview = true ;
} catch (Exception e) {
Log.i(TAG, e.getMessage());
}
// preview = true;
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
if (camera != null ){
if (preview){
camera.stopPreview(); // 停止预览
}
camera.release();
}
}
}
}