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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