Android自動聚焦、攝像頭拍照、縮放至標準大小的完整實現
手機華為U9200,
android4.0.3,
預覽的引數:myParameters.setPreviewSize(1280, 720)
圖片引數:myParameters.setPictureSize(2048, 1152); //1280, 720
圖片最終尺寸:寬600 * 高800
參照http://www.cnblogs.com/liuan/archive/2012/01/10/2318300.html,上面的思路是弄了一個定時器來進行自動聚焦,但發現根本不中,一按拍照程式就掛掉。而且由於定時器一直在重複迴圈,相機就在那聚焦來聚焦去,也就是一下清晰一下又模糊了。後來我把程式改成,當拍照後把定時器關閉掉髮現還是不中。經反覆實驗,終於成功。南無阿彌陀佛,本著我為人人,人人為我。將原始碼貼在此處:
第一,佈局檔案。裡面有一個surfaceview和三個按鈕,分別是預覽、拍照、儲存。
<?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="預覽" /> <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="儲存" /> </LinearLayout> </LinearLayout>
第2,源程式:
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); //璁劇疆鍏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); //璁劇疆甯冨矓 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)) //濡傛灉鍒涘緩鏂囦歡澶瑰け璐? { AlertDialog.Builder alertDialog = new Builder(TestPhotoActivity.this); alertDialog.setTitle("閿欒"); alertDialog.setMessage("鍥劇墖淇濆瓨鏂囦歡澶瑰壋寤哄け璐ワ紒"); alertDialog.setPositiveButton("紜畾", 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墖灝嗕繚瀛樺湪錛? + 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, "鑷姩鑱氱劍鎴愬姛錛?, 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錛?, Toast.LENGTH_SHORT).show(); break; case R.id.btnSave: if(bm == null) { Toast.makeText(TestPhotoActivity.this, "璇鋒媿鎽勬垚鍔熷悗鍐嶄繚瀛橈紒錛侊紒", 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€呮牱鏈暟鐩凡瓚呰繃100錛?, 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淇濆瓨鎴愬姛錛佺紪鍙鳳細"+ b + c, Toast.LENGTH_SHORT).show(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); Toast.makeText(TestPhotoActivity.this, "淇濆瓨澶辮觸", 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, "鍒濆鍖栫溮鏈洪敊璇?, Toast.LENGTH_SHORT).show(); } } } class CameraTimerTask extends TimerTask{ @Override public void run() { // TODO Auto-generated method stub if(myCamera != null) { myCamera.autoFocus(mAutoFocusCallback); } } } //鍒ゆ柇鏂囦歡澶規槸鍚﹀瓨鍦紝濡傛灉涓嶅瓨鍦ㄥ墶鍒涘緩涓€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; } }
自動聚焦部分,核心的程式碼有,建構函式裡的
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,
"自動聚焦成功" , Toast.LENGTH_SHORT).show();
}
}
};
和initCamera裡的myCamera.autoFocus(mAutoFocusCallback);呼叫!
第三,AndroidManifest檔案,紅線部分是新增的對攝像頭操作、sd儲存的許可權許可。
<?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′腑鍒涘緩鍜屽垹闄ゆ枃浠剁殑鏉冮檺 -->
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
<!-- 鍦╯d鍗′腑鍐欏靉鏁版嵁鐨勬潈闄?-->
<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>
上兩張效果圖,來看下攝像頭相同的previewSize、pictureSize下,自動對焦前後的差別:
效果差別不是一般的大啊!
1,上面的源程式裡mTimer、mTimerTask等這些是我第一種思路,用定時器來控制聚焦,結果是失敗的。碰到這些,大家略過去就行了。
2,這裡控制聚焦的核心實現時,在initCamera函式裡,執行myCamera.autoFocus(mAutoFocusCallback);自動聚焦這句話!在建構函式裡定義了一個mAutoFocusCallback的回撥函式變數。還可以在按下拍照按鈕後判斷當前是否自動聚焦成功,如果聚焦成功再拍照!mAutoFocusCallback裡的if(success)就是標示自動聚焦成功
3,網上有很多,只是簡單的在建構函式裡寫一句myCamera.setFocus(null),我真懷疑,這不是坑爹麼?反正我這樣是沒弄成功。
4,程式裡的亂碼部分是文字,由於從linux下拷出來就成亂碼了,大家不用太關心,都是些提示性的話。
5,另外還要交代一下,自動聚焦這句話一定要在攝像頭正常預覽的時候呼叫,否則是沒有意義的,程式也會掛掉。
6,我核心的參考文章:
向他們表示感謝!
遺留的問題:
我第一次按下預覽按鈕後,會進行自動聚焦,並提示自動聚焦成功。如果此時執行拍照--儲存--再次預覽,則自動聚焦是成功的。 如果我預覽後,調整了和拍攝物的距離這時想再次自動聚焦,即連續兩次按下預覽按鈕,怎麼第二次就不自動聚焦了呢???這是不是和android攝像頭內建的屬性有關係?
----------------------作者yanzi1225627 轉載請註明 2012.8.31