Android实现摄像头拍照功能

 import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.util.Log; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ImageView; public class MainActivity extends Activity { private Button cameraButton; //拍照按钮 private Button quitButton; //退出按钮 private ImageView imageView; //图片显示 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initViews(); } private void initViews() { imageView = (ImageView) findViewById(R.id.main_image); // 从本地取图片(在sdcard中获取文件) Bitmap bitmap = getLoacalBitmap("/sdcard/mhc.jpg-600"); Log.e("msgTag", new File("/sdcard/mhc.jpg-600").exists()+"=========="); imageView .setImageBitmap(bitmap); //设置Bitmap cameraButton = (Button) findViewById(R.id.main_camera); quitButton = (Button) findViewById(R.id.main_quit); MainOnClickListener mainOnClickListener = new MainOnClickListener(); cameraButton.setOnClickListener(mainOnClickListener); quitButton.setOnClickListener(mainOnClickListener); } private class MainOnClickListener implements OnClickListener{ @Override public void onClick(View v) { switch (v.getId()) { case R.id.main_camera: startActivity(new Intent(MainActivity.this, CameraActivity.class)); break; case R.id.main_quit: MainActivity.this.finish(); break; default: break; } } } /** * 根据文件路径获取所需要文件，并将该文件封装成Bitmap对象返回 * @param fileUrl * @return */ public static Bitmap getLoacalBitmap(String fileUrl) { try { FileInputStream fis = new FileInputStream(fileUrl); return BitmapFactory.decodeStream(fis); ///把流转化为Bitmap图片 } catch (FileNotFoundException e) { e.printStackTrace(); return null; } } } 

 import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import android.graphics.ImageFormat; import android.hardware.Camera; import android.os.AsyncTask; import android.os.Bundle; import android.app.Activity; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class CameraActivity extends Activity { private String tag ="CameraActivity"; private SurfaceView surfaceView; //Surface的控制器 private SurfaceHolder surfaceHolder; private Camera camera; private Button saveButton; //拍照的回调接口 private Camera.PictureCallback pictureCallback = new Camera.PictureCallback() { public void onPictureTaken(byte[] data, Camera camera) { new SavePictureTask().execute(data); camera.startPreview(); } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_camera); initViews(); } private void initViews() { saveButton = (Button) findViewById(R.id.camera_save); surfaceView = (SurfaceView) findViewById(R.id.camera_preview); surfaceHolder = surfaceView.getHolder(); // 给SurfaceView当前的持有者 SurfaceHolder 一个回调对象。 //用户可以实现此接口接收surface变化的消息。当用在一个SurfaceView 中时， //它只在SurfaceHolder.Callback.surfaceCreated()和SurfaceHolder.Callback.surfaceDestroyed()之间有效。 //设置Callback的方法是SurfaceHolder.addCallback. //实现过程一般继承SurfaceView并实现SurfaceHolder.Callback接口 surfaceHolder.addCallback(surfaceCallback); // 设置surface不需要自己的维护缓存区 surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); saveButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { camera.takePicture(null, null, pictureCallback); // Camera.takePicture(shutterCallback,rawCallback,pictureCallback ); // private ShutterCallback shutterCallback = new ShutterCallback(){ //  public void onShutter(){ //  /* 按快门瞬间会执行这里的代码 */ //  } //  }; // private PictureCallback rawCallback = new PictureCallback(){ //  public void onPictureTaken(byte[] _data, Camera _camera){ //  /* 如需要处理 raw 则在这里 写代码 */ //  } //  }; //  //当拍照后 存储JPG文件到 sd卡 //  PictureCallback pictureCallback=new PictureCallback(){ //  public void onPictureTaken(byte[] data,Camera camera) { //  FileOutputStream outSteam=null; //  try{ //  SimpleDateFormat format=new SimpleDateFormat("yyyyMMddHHmmss"); //  String times=format.format((new Date())); //  outSteam=new FileOutputStream("/sdcard/"+times+"mhc.jpg-600"); //  outSteam.write(data); //  outSteam.close(); //  }catch(FileNotFoundException e){ //  Log.d("Camera", "row"); //  } catch (IOException e) { //  e.printStackTrace(); //  } //  }; //  }; } }); } //SurfaceView当前的持有者的回调接口的实现 SurfaceHolder.Callback surfaceCallback = new SurfaceHolder.Callback() { @Override public void surfaceCreated(SurfaceHolder holder) { camera = Camera.open(); Log.e(tag, "摄像头Open完成"); try { camera.setPreviewDisplay(holder); } catch (IOException e) { camera.release(); camera = null; } } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { Camera.Parameters parameters = camera.getParameters(); parameters.setPictureFormat(ImageFormat.JPEG); camera.setDisplayOrientation(0); camera.setParameters(parameters); camera.startPreview(); } @Override public void surfaceDestroyed(SurfaceHolder holder) { camera.stopPreview(); camera.release(); camera = null; } }; class SavePictureTask extends AsyncTask { @Override protected String doInBackground(byte[]... params) { File picture = new File("/sdcard/mhc.jpg-600"); try { FileOutputStream fos = new FileOutputStream(picture.getPath()); fos.write(params[0]); fos.close(); } catch (Exception e) { e.printStackTrace(); } Log.e(tag, "照片保存完成"); CameraActivity.this.finish(); return null; } } }