android camera的基本使用

import java.io.File;import java.io.FileOutputStream;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.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;public class MyCamera extends Activity{private SurfaceView surfaceView;Camera camera;boolean preview=false;private static final String TAG = "camera";public void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);Window window=getWindow();//设置没有titlerequestWindowFeature(Window.FEATURE_NO_TITLE);//全屏显示window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);setContentView(R.layout.main);surfaceView=(SurfaceView)this.findViewById(R.id.surfaceView);surfaceView.getHolder().addCallback(new SufaceListener());//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}private final class SufaceListener implements SurfaceHolder.Callback{public void surfaceChanged(SurfaceHolder holder,int format,int width,int height){}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());//每秒3帧parameters.setPreviewFrameRate(3);parameters.setPreviewFormat(PixelFormat.JPEG);parameters.set("jpeg-quality", 85);parameters.setPictureSize(display.getWidth(), display.getHeight());camera.setParameters(parameters);camera.setPreviewDisplay(surfaceView.getHolder());//显示取景画面camera.startPreview();preview=true;}catch(Exception e){Log.e(TAG,e.toString());}}public void surfaceDestroyed(SurfaceHolder holder){if(camera!=null){if(preview)camera.stopPreview();camera.release();camera=null;}}}public boolean onKeyDown(int keyCode,KeyEvent event){if(camera!=null&&event.getRepeatCount()==0){switch(keyCode){case KeyEvent.KEYCODE_SEARCH:camera.autoFocus(null);//自动对焦break;case KeyEvent.KEYCODE_DPAD_CENTER: ;case  KeyEvent.KEYCODE_CAMERA:camera.takePicture(null,null, new PictureCallbackListener());break;}}return true;}public final class PictureCallbackListener implements Camera.PictureCallback{public void onPictureTaken(byte[] data,Camera canera){try{Bitmap bitmap=BitmapFactory.decodeByteArray(data, 0, data.length);File file=new File(Environment.getExternalStorageDirectory(),"ljh.jpg");FileOutputStream outStream=new FileOutputStream(file);bitmap.compress(CompressFormat.JPEG, 100,outStream);outStream.close();//camera.stopPreview();camera.startPreview();preview=true;}catch(Exception e){Log.e(TAG,e.toString());}}}/*//调用系统自带的照相功能Intent intent=new Intent();intent.setAction("android.media.action.STILL_IMAGE_CAMERA");*/}
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