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>