拍照并保存

<!--在SDCard中创建与删除文件权限 –>
<uses-permissioandroid:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/> 
<!--往SDCard写入数据权限 --> 
<uses-permissionandroid:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)

// 获取SD卡状态，并且值为Environment.MEDIA_MOUNTED时进行照片的拍摄。

private static final File PHOTO_DIR = new File(Environment.getExternalStorageDirectory() + "/DCIM/Camera"); // 图片的存储目录

PHOTO_DIR.mkdir();//创建目录

File mCurrentPhotoFile;//图片文件

 mCurrentPhotoFile = new File(PHOTO_DIR, getPhotoFileName()); // 用当前时间给取得的图片命名

    /**

     * 创建一个新的图片名

     */

 private String getPhotoFileName() {

       Date date = new Date(System.currentTimeMillis());

        SimpleDateFormat format = new SimpleDateFormat("‘IMG‘_yyyyMMdd_HHmmss");

        return format.format(date) + ".jpg";

    }

private static final int CAMERA_WITH_DATA = 0; // 拍照

Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");//跳转到照相

Uri fromFile = Uri.fromFile(mCurrentPhotoFile);

 // String string = fromFile.toString();

 intent.putExtra(MediaStore.EXTRA_OUTPUT,

 Uri.fromFile(mCurrentPhotoFile));

 startActivityForResult(intent, CAMERA_WITH_DATA);

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import com.example.test.R;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

/**
 * Created by Administrator on 2014/9/9.
 */
public class GetPic extends Activity {
    private static final File PHOTO_DIR = new File(
            Environment.getExternalStorageDirectory() + "/DCIM/Camera"); // 图片的存储目录
    File mCurrentPhotoFile;//图片文件
    private static final int CAMERA_WITH_DATA = 0; // 拍照
    private Integer mStepImg = 0;
    private static final int SCALE = 4;// 照片缩小比例
    private List<Bitmap> mBitmaps = new ArrayList<Bitmap>();
    private ImageView mImg_pic1, mImg_pic2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.get_pic);

        mImg_pic1 = (ImageView) findViewById(R.id.view1);
        mImg_pic2 = (ImageView) findViewById(R.id.view2);
        Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getPicFromCapture();
            }
        });


    }

    private void getPicFromCapture() {
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {//判断SDCard的状态
            PHOTO_DIR.mkdir();//创建目录
            mCurrentPhotoFile = new File(PHOTO_DIR, getPhotoFileName()); // 用当前时间给取得的图片命名
            Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");//跳转到照相
            Uri fromFile = Uri.fromFile(mCurrentPhotoFile);
            // String string = fromFile.toString();
            intent.putExtra(MediaStore.EXTRA_OUTPUT,
                    Uri.fromFile(mCurrentPhotoFile));

            startActivityForResult(intent, CAMERA_WITH_DATA);
        } else {
            Log.e("---------", "没有sd卡");
        }
    }

    /**
     * 创建一个新的图片名
     */
    private String getPhotoFileName() {
        Date date = new Date(System.currentTimeMillis());

        SimpleDateFormat format = new SimpleDateFormat("‘IMG‘_yyyyMMdd_HHmmss");
        return format.format(date) + ".jpg";
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode != RESULT_OK)
            return;
        switch (requestCode) {
            case CAMERA_WITH_DATA: {// 照相机程序返回的,再次调用图片剪辑程序去修剪图片
               mStepImg++;
                // Bundle extras = data.getExtras();
                // final Bitmap bitmap = (Bitmap) extras.get("data");

                // 获取图片、缩小、显示、保存
               Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoFile.toString());//根据文件全路径获取图片

               final ImgModel imgModel = new ImgModel();
                imgModel.path = mCurrentPhotoFile.toString();
                // imgModel.bitmap = bitmap;

             Bitmap newBitmap = zoomBitmap(bitmap, bitmap.getWidth() / SCALE, bitmap.getHeight() / SCALE);//缩放图片

               bitmap.recycle();// 由于Bitmap内存占用较大，这里需要回收内存，否则会报out of memory异常

               mBitmaps.add(bitmap);//？？如果用到缩放前图片
               mBitmaps.add(newBitmap);
             mImg_pic1.setScaleType(ImageView.ScaleType.CENTER_CROP);
             mImg_pic2.setScaleType(ImageView.ScaleType.CENTER_CROP);//按比例扩大图片的size居中显示，使得图片长(宽)等于或大于View的长(宽)
                // 生成图片显示在界面上
                if (mStepImg == 1) {
                    mImg_pic1.setTag(mStepImg);
                    mImg_pic1.setImageBitmap(newBitmap);//
                    mImg_pic2.setVisibility(View.VISIBLE);
                } else if (mStepImg == 2) {
                    mImg_pic2.setTag(mStepImg);
                    mImg_pic2.setImageBitmap(newBitmap);
                }
                // 将处理过的图片显示在界面上，并保存到本地
                savePhotoToSDCard(newBitmap, Environment.getExternalStorageDirectory().getAbsolutePath(),
                        String.valueOf(System.currentTimeMillis()));
                //Environment.getExternalStorageDirectory().getAbsolutePath()是获取外部存储路径的绝对路径，即SD卡的文件路径
                //此处的事件是保存事件

                break;
            }
        }
    }

    public Bitmap zoomBitmap(Bitmap bitmap, int width, int height) {//缩小BitMap
        int w = bitmap.getWidth();
        int h = bitmap.getHeight();
        Matrix matrix = new Matrix();
        float scaleWidth = ((float) width / w);
        float scaleHeight = ((float) height / h);
        matrix.postScale(scaleWidth, scaleHeight);
        Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, w, h, matrix, true);
        return newbmp;
    }

    /**
     * 保存图片
     */
    public void savePhotoToSDCard(Bitmap photoBitmap, String path, String photoName) {
        if (checkSDCardAvailable()) {
            File dir = new File(path);
            if (!dir.exists()) {//dir.exists()判断路径是否存在，不存在则创建
                dir.mkdirs();
            }

            File photoFile = new File(path, photoName + ".png");
            FileOutputStream fileOutputStream = null;
            try {
                fileOutputStream = new FileOutputStream(photoFile);
                if (photoBitmap != null) {
                    if (photoBitmap.compress(Bitmap.CompressFormat.PNG, 100,
                            fileOutputStream)) {
                        fileOutputStream.flush();//清除
                        // fileOutputStream.close();
                    }
                }
            } catch (FileNotFoundException e) {
                photoFile.delete();
                e.printStackTrace();
            } catch (IOException e) {
                photoFile.delete();
                e.printStackTrace();
            } finally {
                try {
                    fileOutputStream.close();//关闭
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * 判断SD卡是否可用
     *
     * @return
     */
    public boolean checkSDCardAvailable() {
        return android.os.Environment.getExternalStorageState().equals(
                android.os.Environment.MEDIA_MOUNTED);
    }
}

/**
 * Created by Administrator on 2014/9/9.
 */
public class ImgModel {
    public String path;
}