Android开发之拍照功能实现

参考链接：http://www.linuxidc.com/Linux/2013-11/92892p3.htm

原文链接：http://blog.csdn.net/tangcheng_ok/article/details/7036871

增加使用相机和写入权限：

    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.camera.autofocus" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 

主程序代码：

package com.example.carejulygpsmap;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

import java.io.ByteArrayOutputStream;
import java.io.File;
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; 

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class CareJulyActivity extends ActionBarActivity {

    private final static String TAG = "CameraActivity";
    private SurfaceView surfaceView;
    private SurfaceHolder surfaceHolder;
    private Camera camera;
    private File picture;
    private Button btnSave;  

    private static final int NONE = 0;
    private static final int PHOTO_GRAPH = 1;// 拍照
    private static final int PHOTO_ZOOM = 2; // 缩放
    private static final int PHOTO_RESOULT = 3;// 结果
    private static final String IMAGE_UNSPECIFIED = "image/*";
    private ImageView imageView = null;
    private Button btnPhone = null;
    private Button btnTakePicture = null;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_care_july);
        setupViews();
//        imageView = (ImageView) findViewById(R.id.imageView);
//        btnPhone = (Button) findViewById(R.id.btnPhone);
//        btnPhone.setOnClickListener(onClickListener);
//        btnTakePicture = (Button) findViewById(R.id.btnTakePicture);
//        btnTakePicture.setOnClickListener(onClickListener);
	}

//	@Override//src
//	protected void onCreate(Bundle savedInstanceState) {
//		super.onCreate(savedInstanceState);
//		setContentView(R.layout.activity_care_july);
//	}

	@Override//src
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.care_july, menu);
		return true;
	}

	@Override//src
	public boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		}
		return super.onOptionsItemSelected(item);
	}

	//CamCap
    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
    //保存图片，不过保存的图片较小，保存在根目录 的wishchin文件夹里面
    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()+"/wishchin/"+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;
        }
    };
}

界面代码：

<?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="462dp"
        android:layout_height="534dp"
        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="txt_save" />  

</LinearLayout>