Android之拍照

package cn.itcast.picture;import java.io.File;import java.io.FileNotFoundException;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;public class TakeActivity extends Activity {private static final String TAG = "TakeActivity";    private SurfaceView surfaceView;    private Camera camera;    private boolean preview;    @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);        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);        surfaceView.getHolder().addCallback(new SurfaceCallback());    }        private final class SurfaceCallback implements SurfaceHolder.Callback{@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {}@Overridepublic void surfaceCreated(SurfaceHolder holder) {try {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preview = true;} catch (IOException e) {Log.e(TAG, e.toString());}}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {if(camera!=null){if(preview) camera.stopPreview();camera.release();}}        }@Overridepublic 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_CAMERA:case KeyEvent.KEYCODE_DPAD_CENTER:camera.takePicture(null, null, new TakePictureCallback());break;}}return true;}private final class TakePictureCallback implements PictureCallback{@Overridepublic void onPictureTaken(byte[] data, Camera camera) {try {Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);File file = new File(Environment.getExternalStorageDirectory(), System.currentTimeMillis()+".jpg");FileOutputStream outStream = new FileOutputStream(file);bitmap.compress(CompressFormat.JPEG, 100, outStream);outStream.close();camera.stopPreview();camera.startPreview();//开始预览} catch (Exception e) {Log.e(TAG, e.toString());}}}    }

  <?xml version="1.0" encoding="utf-8" ?> - <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="cn.itcast.picture" android:versionCode="1" android:versionName="1.0">- <application android:icon="@drawable/icon" android:label="@string/app_name">- <activity android:name=".TakeActivity" 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>  <uses-sdk android:minSdkVersion="7" />   <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>

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