使用摄像头拍照
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();
}
}
}
}
