Android开发之拍照功能实现（附源码）

大家好，这是一个简单的拍照功能，很简单的界面，一个显示图像区域SurfaceView一个“拍照”按钮。直接上代码！

1、CameraDemoActivity.java（主界面）
package org.winplus.camera;  
  
import java.io.File;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.util.Date;  
  
import android.app.Activity;  
import android.content.pm.ActivityInfo;  
import android.graphics.PixelFormat;  
import android.hardware.Camera;  
import android.os.AsyncTask;  
import android.os.Bundle;  
import android.os.Environment;  
import android.text.format.DateFormat;  
import android.util.Log;  
import android.view.KeyEvent;  
import android.view.SurfaceHolder;  
import android.view.SurfaceView;  
import android.view.View;  
import android.view.Window;  
import android.view.View.OnClickListener;  
import android.widget.Button;  
  
public class CameraDemoActivity extends Activity{  
  
    private final static String TAG = "CameraActivity";  
    private SurfaceView surfaceView;  
    private SurfaceHolder surfaceHolder;  
    private Camera camera;  
    private File picture;  
    private Button btnSave;  
      
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);  
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);  
        setContentView(R.layout.main);  
        setupViews();  
    }  
      
    private void setupViews(){  
        surfaceView = (SurfaceView) findViewById(R.id.camera_preview); // Camera interface to instantiate components  
        surfaceHolder = surfaceView.getHolder(); // Camera interface to instantiate components  
        surfaceHolder.addCallback(surfaceCallback); // Add a callback for the SurfaceHolder  
        surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);  
          
        btnSave = (Button) findViewById(R.id.save_pic);  
          
        btnSave.setOnClickListener(new OnClickListener() {  
              
            @Override  
            public void onClick(View v) {  
                takePic();  
            }  
        });  
    }  
      
      
    @Override  
    public boolean onKeyDown(int keyCode, KeyEvent event) {  
        if (keyCode == KeyEvent.KEYCODE_CAMERA  
                || keyCode == KeyEvent.KEYCODE_SEARCH) {  
            takePic();  
            return true;  
        }  
        return super.onKeyDown(keyCode, event);  
    }  
  
    private void takePic() {  
  
        camera.stopPreview();// stop the preview  
  
        camera.takePicture(null, null, pictureCallback); // picture  
    }  
  
    // Photo call back  
    Camera.PictureCallback pictureCallback = new Camera.PictureCallback() {  
        //@Override  
        public void onPictureTaken(byte[] data, Camera camera) {  
            new SavePictureTask().execute(data);  
            camera.startPreview();  
        }  
    };  
  
    // save pic  
    class SavePictureTask extends AsyncTask<byte[], String, String> {  
        @Override  
        protected String doInBackground(byte[]... params) {  
            String fname = DateFormat.format("yyyyMMddhhmmss", new Date()).toString()+".jpg";  
              
            Log.i(TAG, "fname="+fname+";dir="+Environment.getExternalStorageDirectory());  
            //picture = new File(Environment.getExternalStorageDirectory(),fname);// create file  
              
            picture = new File(Environment.getExternalStorageDirectory()+"/"+fname);  
              
            try {  
                FileOutputStream fos = new FileOutputStream(picture.getPath()); // Get file output stream  
                fos.write(params[0]); // Written to the file  
                fos.close();   
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
            return null;  
        }  
    }  
  
    // SurfaceHodler Callback handle to open the camera, off camera and photo size changes  
    SurfaceHolder.Callback surfaceCallback = new SurfaceHolder.Callback() {  
  
        public void surfaceCreated(SurfaceHolder holder) {  
            Log.i(TAG, "surfaceCallback====");  
            camera = Camera.open(); // Turn on the camera  
            try {  
                camera.setPreviewDisplay(holder); // Set Preview  
            } catch (IOException e) {  
                camera.release();// release camera  
                camera = null;  
            }  
        }  
  
        public void surfaceChanged(SurfaceHolder holder, int format, int width,  
                int height) {  
            Log.i(TAG,"====surfaceChanged");  
            Camera.Parameters parameters = camera.getParameters(); // Camera parameters to obtain  
            parameters.setPictureFormat(PixelFormat.JPEG);// Setting Picture Format  
//          parameters.set("rotation", 180); // Arbitrary rotation  
            camera.setDisplayOrientation(0);  
//          parameters.setPreviewSize(400, 300); // Set Photo Size  
            camera.setParameters(parameters); // Setting camera parameters  
            camera.startPreview(); // Start Preview  
        }  
  
        public void surfaceDestroyed(SurfaceHolder holder) {  
            Log.i(TAG,"====surfaceDestroyed");  
            camera.stopPreview();// stop preview  
            camera.release(); // Release camera resources  
            camera = null;  
        }  
    };  
}  
2、main.xml（布局文件）
<?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" >  
  
    <android.view.SurfaceView  
        android:id="@+id/camera_preview"  
        android:layout_width="800dip"  
        android:layout_height="600dip"  
        android:layout_alignParentTop="true"  
        android:layout_centerInParent="true"  
        android:layout_gravity="center_vertical|center_horizontal" />  
  
    <Button  
        android:id="@+id/save_pic"  
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content"  
        android:text="@string/txt_save" />  
  
</LinearLayout>  

3、别忘了添加权限：
<uses-permission android:name="android.permission.CAMERA" />  
  
<uses-feature android:name="android.hardware.camera" />  
<uses-feature android:name="android.hardware.camera.autofocus" android:required="false" />  
  
源码下载==》
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