为什么把自动聚焦放在前面呢?因为前文http://blog.csdn.net/yanzi1225627/article/details/7738736已经实现了拍照功能,且网上拍照的源码例子很多,自动聚焦很多人写的很简单,但结果发现不中。我这里就总结下,我的自动聚焦的实现。
手机华为U9200,
Android4.0.3,
预览的参数:myParameters.setPreviewSize(1280, 720)
图片参数:myParameters.setPictureSize(2048, 1152); //1280, 720
图片最终尺寸:宽600 * 高800
(关于setPreviewSize和setPictureSize的问题可以参照我以前的文章http://blog.csdn.net/yanzi1225627/article/details/7738736)
参照http://www.cnblogs.com/liuan/archive/2012/01/10/2318300.html, 上面的思路是弄了一个定时器来进行自动聚焦,但发现根本不中,一按拍照程序就挂掉。而且由于定时器一直在重复循环,相机就在那聚焦来聚焦去,也就是一下清 晰一下又模糊了。后来我把程序改成,当拍照后把定时器关闭掉发现还是不中。经反复实验,终于成功。南无阿弥陀佛,本着我为人人,人人为我。将源码贴在此 处:
第一,布局文件。里面有一个surfaceview和三个按钮,分别是预览、拍照、保存。
- <?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/mySurfaceView”
- android:layout_width=“fill_parent”
- android:background=“#D1EEEE”
- android:layout_height=“800px”
- android:gravity=“center” />
- <LinearLayout
- android:id=“@+id/LinearLayout01”
- android:layout_width=“wrap_content”
- android:layout_height=“wrap_content”
- android:layout_gravity=“center_horizontal”
- android:paddingTop=“20dip”
- android:orientation=“horizontal” >
- <Button
- android:id=“@+id/btnPreview”
- android:layout_width=“wrap_content”
- android:layout_height=“wrap_content”
- android:text=“预览” />
- <Button
- android:id=“@+id/btnPhoto”
- android:layout_width=“wrap_content”
- android:layout_height=“wrap_content”
- android:text=“拍照” />
- <Button
- android:id=“@+id/btnSave”
- android:layout_width=“wrap_content”
- android:layout_height=“wrap_content”
- android:text=“保存” />
- </LinearLayout>
- </LinearLayout>
第2,源程序:
- package yan.guoqi.testphoto;
- import java.io.BufferedOutputStream;
- import java.io.File;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.util.Timer;
- import java.util.TimerTask;
- import android.app.Activity;
- import android.app.AlertDialog;
- import android.app.AlertDialog.Builder;
- import android.content.DialogInterface;
- import android.graphics.Bitmap;
- import android.graphics.BitmapFactory;
- import android.graphics.PixelFormat;
- import android.hardware.Camera;
- import android.hardware.Camera.PictureCallback;
- import android.hardware.Camera.ShutterCallback;
- import android.os.Bundle;
- import android.util.Log;
- import android.view.SurfaceHolder;
- import android.view.SurfaceView;
- import android.view.View;
- import android.view.View.OnClickListener;
- import android.view.Window;
- import android.view.WindowManager;
- import android.widget.Button;
- import android.widget.Toast;
- public class TestPhotoActivity extends Activity implements SurfaceHolder.Callback{
- /** Called when the activity is first created. */
- private static final String TAG = “yan:”;
- SurfaceView mySurfaceView = null;
- SurfaceHolder mySurfaceHolder = null;
- Button btnPreview = null;
- Button btnPhoto = null;
- Button btnSave = null;
- Camera myCamera = null;
- Camera.Parameters myParameters;
- boolean isView = false;
- Bitmap bm;
- String savePath = “/mnt/sdcard/testPhoto/”;
- int cntSave = 0;
- private Camera.AutoFocusCallback mAutoFocusCallback;
- //private Camera.PreviewCallback mPreviewCallback;
- private Timer mTimer;
- private TimerTask mTimerTask;
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- //璁剧疆鍏ㄥ睆鏃犳爣棰? requestWindowFeature(Window.FEATURE_NO_TITLE);
- int flag = WindowManager.LayoutParams.FLAG_FULLSCREEN;
- Window myWindow = this.getWindow();
- myWindow.setFlags(flag, flag);
- setContentView(R.layout.main); //璁剧疆甯冨眬
- mySurfaceView = (SurfaceView)findViewById(R.id.mySurfaceView);
- mySurfaceView.setZOrderOnTop(true);
- mySurfaceHolder = mySurfaceView.getHolder();
- mySurfaceHolder.setFormat(PixelFormat.TRANSLUCENT);
- btnPreview = (Button)findViewById(R.id.btnPreview);
- btnPhoto = (Button)findViewById(R.id.btnPhoto);
- btnSave = (Button)findViewById(R.id.btnSave);
- if(!isFolderExist(savePath)) //濡傛灉鍒涘缓鏂囦欢澶瑰け璐? {
- AlertDialog.Builder alertDialog = new Builder(TestPhotoActivity.this);
- alertDialog.setTitle(“閿欒”);
- alertDialog.setMessage(“鍥剧墖淇濆瓨鏂囦欢澶瑰垱寤哄け璐ワ紒”);
- alertDialog.setPositiveButton(“纭畾”, new DialogInterface.OnClickListener() {
- public void onClick(DialogInterface dialog, int which) {
- // TODO Auto-generated method stub
- dialog.dismiss();
- TestPhotoActivity.this.finish();
- }
- });
- alertDialog.show();
- }
- else
- Toast.makeText(TestPhotoActivity.this,
- “鎮ㄧ殑鐓х墖灏嗕繚瀛樺湪锛? + savePath,
- Toast.LENGTH_SHORT).show();
- mySurfaceHolder.addCallback(this);
- mySurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
- mAutoFocusCallback = new Camera.AutoFocusCallback() {
- public void onAutoFocus(boolean success, Camera camera) {
- // TODO Auto-generated method stub
- if(success){
- myCamera.setOneShotPreviewCallback(null);
- Toast.makeText(TestPhotoActivity.this,
- “鑷姩鑱氱劍鎴愬姛锛?,
- Toast.LENGTH_SHORT).show();
- }
- }
- };
- mTimer = new Timer();
- mTimerTask = new CameraTimerTask();
- //mTimer.schedule(mTimerTask, 0, 500);
- btnPreview.setOnClickListener(new BtnListener());
- btnPhoto.setOnClickListener(new BtnListener());
- btnSave.setOnClickListener(new BtnListener());
- }
- ShutterCallback myShutterCallback = new ShutterCallback() {
- public void onShutter() {
- // TODO Auto-generated method stub
- }
- };
- PictureCallback myRawCallback = new PictureCallback() {
- public void onPictureTaken(byte[] data, Camera camera) {
- // TODO Auto-generated method stub
- }
- };
- PictureCallback myjpegCalback = new PictureCallback() {
- public void onPictureTaken(byte[] data, Camera camera) {
- // TODO Auto-generated method stub
- Log.i(TAG, “onPictureTaken……..”);
- bm = BitmapFactory.decodeByteArray(data, 0, data.length);
- isView = false;
- myCamera.stopPreview();
- myCamera.release();
- myCamera = null;
- isView = false;
- }
- };
- class BtnListener implements OnClickListener{
- public void onClick(View v) {
- // TODO Auto-generated method stub
- switch(v.getId()){
- case R.id.btnPreview:
- Toast.makeText(TestPhotoActivity.this,
- “鎮ㄦ寜浜嗛瑙堟寜閽?,
- Toast.LENGTH_SHORT).show();
- initCamera();
- break;
- case R.id.btnPhoto:
- if(isView && myCamera!=null){
- myCamera.takePicture(myShutterCallback, myRawCallback, myjpegCalback);
- }
- else
- Toast.makeText(TestPhotoActivity.this, “璇峰厛棰勮鐒跺悗鎷嶇収锛?, Toast.LENGTH_SHORT).show();
- break;
- case R.id.btnSave:
- if(bm == null)
- {
- Toast.makeText(TestPhotoActivity.this, “璇锋媿鎽勬垚鍔熷悗鍐嶄繚瀛橈紒锛侊紒”, Toast.LENGTH_SHORT).show();
- return;
- }
- int b =0, c=1;
- File fTest = new File(savePath + b + c + “.JPG”);
- while(fTest.exists()){
- if(c==9){
- b++;
- c = 0;
- }
- else
- c++;
- if(b==9){
- b = 0;
- Toast.makeText(TestPhotoActivity.this, “姝ゅ織鎰胯€呮牱鏈暟鐩凡瓒呰繃100锛?,
- Toast.LENGTH_SHORT).show();
- }
- fTest = new File(savePath + b + c + “.JPG”);
- }
- try {
- FileOutputStream fout = new FileOutputStream(fTest);
- BufferedOutputStream bos = new BufferedOutputStream(fout);
- Bitmap mBitmap = Bitmap.createScaledBitmap(bm, 600, 800, false);
- mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, bos);
- //bm.compress(Bitmap.CompressFormat.JPEG, 100, bos);
- bos.flush();
- bos.close();
- cntSave++;
- Toast.makeText(TestPhotoActivity.this, “鎮ㄦ媿鐨勭”+cntSave+“寮爌icture淇濆瓨鎴愬姛锛佺紪鍙凤細”+ b + c,
- Toast.LENGTH_SHORT).show();
- } catch (IOException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- Toast.makeText(TestPhotoActivity.this,
- “淇濆瓨澶辫触”,
- Toast.LENGTH_SHORT).show();
- }
- break;
- default:
- }
- }
- }
- public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
- // TODO Auto-generated method stub
- }
- public void surfaceCreated(SurfaceHolder arg0) {
- // TODO Auto-generated method stub
- }
- public void surfaceDestroyed(SurfaceHolder arg0) {
- // TODO Auto-generated method stub
- }
- //鍒濆鍖栨憚鍍忓ご
- public void initCamera()
- {
- if(myCamera == null && !isView)
- {
- myCamera = Camera.open();
- Log.i(TAG, “camera.open”);
- }
- if(myCamera != null && !isView) {
- try {
- myParameters = myCamera.getParameters();
- myParameters.setPictureFormat(PixelFormat.JPEG);
- myParameters.setPreviewSize(1280, 720);
- //myParameters.setFocusMode(“auto”);
- myParameters.setPictureSize(2048, 1152); //1280, 720
- myParameters.set(“rotation”, 90);
- myCamera.setDisplayOrientation(90);
- myCamera.setParameters(myParameters);
- myCamera.setPreviewDisplay(mySurfaceHolder);
- myCamera.startPreview();
- isView = true;
- myCamera.autoFocus(mAutoFocusCallback);
- } catch (Exception e) {
- // TODO: handle exception
- e.printStackTrace();
- Toast.makeText(TestPhotoActivity.this, “鍒濆鍖栫浉鏈洪敊璇?,
- Toast.LENGTH_SHORT).show();
- }
- }
- }
- class CameraTimerTask extends TimerTask{
- @Override
- public void run() {
- // TODO Auto-generated method stub
- if(myCamera != null)
- {
- myCamera.autoFocus(mAutoFocusCallback);
- }
- }
- }
- //鍒ゆ柇鏂囦欢澶规槸鍚﹀瓨鍦紝濡傛灉涓嶅瓨鍦ㄥ垯鍒涘缓涓€涓? public boolean isFolderExist(String folderPath){
- boolean result = false;
- File f = new File(folderPath);
- if(!f.exists()){
- if(f.mkdir()){
- result = true;
- }
- else
- result = false;
- }
- else
- result = true;
- return result;
- }
- }
自动聚焦部分,核心的代码有,构造函数里的
private Camera.AutoFocusCallback mAutoFocusCallback;
mAutoFocusCallback = new Camera.AutoFocusCallback() {
public void onAutoFocus(boolean success, Camera camera) {
// TODO Auto-generated method stub
if(success){
myCamera.setOneShotPreviewCallback(null);
Toast.makeText(TestPhotoActivity.this,
“自动聚焦成功” , Toast.LENGTH_SHORT).show();
}
}
};
和initCamera里的myCamera.autoFocus(mAutoFocusCallback);调用!
第三,AndroidManifest文件,红线部分是添加的对摄像头操作、sd存储的权限许可。
<?xml version=”1.0″ encoding=”utf-8″?>
<manifest xmlns:android=”http://schemas.android.com/apk/res/android”
package=”yan.guoqi.testphoto”
android:versionCode=”1″
android:versionName=”1.0″ >
<uses-sdk android:minSdkVersion=”15″ />
<!– 鍦╯d鍗′腑鍒涘缓鍜屽垹闄ゆ枃浠剁殑鏉冮檺 –>
<uses-permission android:name=”android.permission.MOUNT_UNMOUNT_FILESYSTEMS” />
<!– 鍦╯d鍗′腑鍐欏叆鏁版嵁鐨勬潈闄?–>
<uses-permission android:name=”android.permission.WRITE_EXTERNAL_STORAGE” />
<!– 浣跨敤鎷嶇収鐨勬潈闄?–>
<uses-permission android:name=”android.permission.CAMERA” />
<uses-feature android:name=”android.hardware.camera” />
<application
android:icon=”@drawable/ic_launcher”
android:label=”@string/app_name” >
<activity
android:name=”.TestPhotoActivity”
android:label=”@string/app_name” >
<intent-filter>
<action android:name=”android.intent.action.MAIN” />
<category android:name=”android.intent.category.LAUNCHER” />
</intent-filter>
</activity>
</application>
</manifest>
上两张效果图,来看下摄像头相同的previewSize、pictureSize下,自动对焦前后的差别:
效果差别不是一般的大啊!
1,上面的源程序里mTimer、mTimerTask等这些是我第一种思路,用定时器来控制聚焦,结果是失败的。碰到这些,大家略过去就行了。
2,这里控制聚焦的核心实现时,在initCamera函数里,执行myCamera.autoFocus(mAutoFocusCallback); 自动聚焦这句话!在构造函数里定义了一个mAutoFocusCallback的回调函数变量。还可以在按下拍照按钮后判断当前是否自动聚焦成功,如果聚 焦成功再拍照!mAutoFocusCallback里的if(success)就是标示自动聚焦成功
3,网上有很多,只是简单的在构造函数里写一句myCamera.setFocus(null),我真怀疑,这不是坑爹么?反正我这样是没弄成功。
4,程序里的乱码部分是文字,由于从linux下拷出来就成乱码了,大家不用太关心,都是些提示性的话。
5,另外还要交代一下,自动聚焦这句话一定要在摄像头正常预览的时候调用,否则是没有意义的,程序也会挂掉。
6,我核心的参考文章:
http://www.cnblogs.com/liuan/archive/2012/01/10/2318300.html
http://www.cnblogs.com/skyseraph/archive/2012/03/26/2418665.html
向他们表示感谢!
遗留的问题:
我第一次按下预览按钮后,会进 行自动聚焦,并提示自动聚焦成功。如果此时执行拍照–保存–再次预览,则自动聚焦是成功的。 如果我预览后,调整了和拍摄物的距离这时想再次自动聚焦,即连续两次按下预览按钮,怎么第二次就不自动聚焦了呢???这是不是和android摄像头内置 的属性有关系?
源码下载链接:http://download.csdn.net/detail/yanzi1225627/4538626
———————-作者yanzi1225627 转载请注明 2012.8.31