PickImageWithCropHelper.java

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.ContentResolver;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;
import android.graphics.Matrix;
import android.graphics.Rect;
import android.media.ExifInterface;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;

/**
 * 
 * 拾取系统照片和相机捕获
 * 
 * 修复：拍照返回方向90和270度错误 修复：未重现800w像素拍照返回时OOM问题
 * 
 * @author Liang
 * 
 */
public class PickImageWithCropHelper {
	protected AlertDialog.Builder dialog;// 对话框
	protected Activity context;// 上下文对象
	public static File mCurrentFilePath = new File(Environment.getExternalStorageDirectory() + "/tempCapture.jpg");// 当前写入的文件路径
	public static File mCropedFilePath = new File(Environment.getExternalStorageDirectory() + "/tempCroped.jpg");// 当前已剪裁的文件路径

	public static final int CODE_PICK_IMAGE = 101;// 从相册里选取
	public static final int CODE_CAPTURE = 100;// 拍摄照片
	public static final int CODE_PHOTO_CROP = 111;// 照片剪裁
	public static Bitmap mBitmapResult;// 获取到的位图对象
	public boolean allowCrop = false;// 允许裁剪

	OnFinishCropping ofc;
	OnFinishPicking ofp;

	/**
	 * 选择相册图片还是拍摄照片。
	 * 
	 * @param context
	 *            传入上下文
	 * @param allowCrop
	 *            是否允许裁剪
	 */
	public PickImageWithCropHelper(Activity context, boolean allowCrop) {
		if (context != null) {
			this.context = context;
			this.allowCrop = allowCrop;
			dialog = new AlertDialog.Builder(context);

		} else {
			throw new NullPointerException("必须传入有效Activity");
		}
	}

	public interface OnFinishCropping {
		public void onFinish();
	}

	public interface OnFinishPicking {
		public void onFinish();
	}

	public void setOnFinishCropping(OnFinishCropping ofc) {
		this.ofc = ofc;
	}

	public void setOnFinishPicking(OnFinishPicking ofp) {
		this.ofp = ofp;
	}

	/**
	 * 弹出对话框，询问拾取图片方式
	 */
	public void createDialog() {
		String[] items = { "拍照", "相册选取" };
		dialog.setTitle("选择照片").setItems(items, new DialogInterface.OnClickListener() {

			@Override
			public void onClick(DialogInterface dialog, int which) {
				switch (which) {
				case 0:// 照相获取
					pickCapture();
					break;
				case 1:// 从相册获取
					pickAlbum();
					break;
				}
			}
		});
		dialog.setNegativeButton("取消", new DialogInterface.OnClickListener() {

			@Override
			public void onClick(DialogInterface dialog, int which) {
				dialog.cancel();
				dialog.dismiss();
			}
		});
		dialog.show();
	}

	/**
	 * 照相获取
	 */
	public void pickCapture() {
		Intent takephoto = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
		takephoto.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(mCurrentFilePath));
		context.startActivityForResult(takephoto, CODE_CAPTURE);
	}

	/**
	 * 从相册获取
	 */
	public void pickAlbum() {
		Intent album = new Intent(Intent.ACTION_GET_CONTENT);
		album.setType("image/*");
		context.startActivityForResult(album, CODE_PICK_IMAGE);
		context.overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);
	}

	/**
	 * 取回位图数据并处理，这里需要放在onActivityResult()回调方法中
	 * 
	 * @param requestCode
	 *            这里直接传入回调方法的参数requestCode
	 * @param resultCode
	 *            这里直接传入回调方法的参数resultCode
	 * @param data
	 *            这里直接传入回调方法的参数resultCode
	 * @throws IOException
	 * @throws FileNotFoundException
	 */
	public void bitmapHandler(int requestCode, int resultCode, final Intent data) {
		final ContentResolver resolver = context.getContentResolver();
		if (resultCode != Activity.RESULT_OK) {// 返回结果不为OK
			return;
		} else if (resultCode == Activity.RESULT_OK && requestCode == CODE_PICK_IMAGE) {// 获取相册照片返回结果为OK时
			Uri uri = data.getData();
			try {
				if (uri != null) {
					mBitmapResult = MediaStore.Images.Media.getBitmap(resolver, uri);

					// 处理缩小图片，需要写图片压缩器
					writeToFile(mCurrentFilePath, mBitmapResult);

					mBitmapResult.recycle();
					mBitmapResult = BitmapHandler.startDecodeBitmapByPath(mCurrentFilePath.getAbsolutePath(), 1024, 768);

					writeToFile(mCurrentFilePath, mBitmapResult);
					mBitmapResult.recycle();

					if (allowCrop) {
						startPhotoZoom(uri);
					}
					if (ofp != null && !allowCrop) {
						ofp.onFinish();
					}
				}
			} catch (FileNotFoundException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			} catch (Exception e) {
				e.printStackTrace();
			} catch (Error e) {
				e.printStackTrace();
			}

		} else if (resultCode == Activity.RESULT_OK && requestCode == CODE_CAPTURE) {// 照相获取[系统相机已经自动写入到文件中]
			mBitmapResult = BitmapHandler.startDecodeBitmapByPath(mCurrentFilePath.getAbsolutePath(), 1024, 768);// 从文件中读取
			ExifInterface exifin = null;
			try {
				exifin = new ExifInterface(mCurrentFilePath.getAbsolutePath());

				// 屏幕旋转
				Matrix matrix = new Matrix();

				int rotateDegree = 0;
				int factDeg = exifin.getAttributeInt(ExifInterface.TAG_ORIENTATION, -1);
				switch (factDeg) {
				case ExifInterface.ORIENTATION_ROTATE_90:
					Logger.e(this, "要旋转90度。");
					rotateDegree = 90;
					break;
				case ExifInterface.ORIENTATION_ROTATE_180:
					Logger.e(this, "要旋转180度。");
					rotateDegree = 180;
					break;
				case ExifInterface.ORIENTATION_ROTATE_270:
					Logger.e(this, "要旋转270度。");
					rotateDegree = 270;
					break;
				default:
					Logger.e(this, "不旋转");
					break;
				}

				/**
				 * 获得到的Bitmap对象
				 */
				Bitmap rotatedBitmap = null;
				if (rotateDegree != 0) {
					matrix.setRotate(rotateDegree);

				}
				rotatedBitmap = Bitmap.createBitmap(mBitmapResult, 0, 0, mBitmapResult.getWidth(), mBitmapResult.getHeight(), matrix, true);

				writeToFile(mCurrentFilePath, rotatedBitmap);
				rotatedBitmap.recycle();

				mBitmapResult.recycle();
				System.gc();
				System.runFinalization();
				if (allowCrop) {
					startPhotoZoom(Uri.fromFile(mCurrentFilePath));
				}
				if (ofp != null && !allowCrop) {
					ofp.onFinish();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}

		} else if (resultCode == Activity.RESULT_OK && requestCode == CODE_PHOTO_CROP) {

			try {
				getCropBitmap(data);
			} catch (IOException e) {
				e.printStackTrace();
			}
			if (ofc != null) {
				ofc.onFinish();
			}

		}
	}

	/**
	 * 获取已经裁剪的位图
	 * 
	 * @param data
	 *            获取数据
	 * @throws IOException
	 */
	public static void getCropBitmap(Intent data) throws IOException {
		// 裁剪
		Bundle extras = data.getExtras();
		if (extras != null) {
			mBitmapResult = extras.getParcelable("data");
			ByteArrayOutputStream stream = new ByteArrayOutputStream();
			mBitmapResult.compress(Bitmap.CompressFormat.JPEG, 100, stream);
			// (0 - 100)压缩文件
			// imageView.setImageBitmap(photo);
			writeToFile(mCropedFilePath, mBitmapResult);
			mBitmapResult.recycle();
		}
	}

	/**
	 * 缩放图片处理入口
	 */
	public void startPhotoZoom(Uri uri) {
		Intent intent = new Intent("com.android.camera.action.CROP");
		intent.setDataAndType(uri, "image/*");
		intent.putExtra("crop", "true"); // aspectX aspectY 是宽高的比例
		intent.putExtra("aspectX", 1);
		intent.putExtra("aspectY", 1); // outputX outputY 是裁剪图片宽高
		intent.putExtra("outputX", 220);
		intent.putExtra("outputY", 220);
		intent.putExtra("return-data", true);
		context.startActivityForResult(intent, CODE_PHOTO_CROP);
	}

	/**
	 * 图片处理器
	 * 
	 * @author Liang
	 * 
	 */
	public static class BitmapHandler {
		Bitmap bitmap;// 图片对象
		static BitmapFactory.Options opts = new Options();// 图片配置

		int originalWidth;// 原始宽度
		int originalHeight;// 原始高度
		int inSampleSize;// 缩放分母

		public static Bitmap startDecodeBitmapByPath(String pathName, int finalWidth, int finalHeight) {
			opts.inJustDecodeBounds = true;
			BitmapFactory.decodeFile(pathName, opts);
			// 计算 inSampleSize
			opts.inSampleSize = calculateInSampleSize(opts, finalWidth, finalHeight);
			// 用 inSampleSize 设置解码位图对象
			opts.inJustDecodeBounds = false;
			opts.inInputShareable = true;
			opts.inPurgeable = true;
			return BitmapFactory.decodeFile(pathName, opts);
		}

		public static Bitmap startDecodeBitmapByInputStream(InputStream is, int finalWidth, int finalHeight) {
			opts.inJustDecodeBounds = true;
			Rect rect = new Rect(-1, -1, -1, -1);
			BitmapFactory.decodeStream(is, rect, opts);
			// 计算 inSampleSize
			opts.inSampleSize = calculateInSampleSize(opts, finalWidth, finalHeight);
			// 用 inSampleSize 设置解码位图对象
			opts.inJustDecodeBounds = false;
			opts.inInputShareable = true;
			opts.inPurgeable = true;
			return BitmapFactory.decodeStream(is, rect, opts);
		}

		public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
			// 原始图像的宽和高
			final int height = options.outHeight;
			final int width = options.outWidth;
			int inSampleSize = 1;

			if (height > reqHeight || width > reqWidth) {
				// 计算原始高度和请求高度的比例，计算原始宽度和请求宽度的比例
				final int heightRatio = Math.round((float) height / (float) reqHeight);
				final int widthRatio = Math.round((float) width / (float) reqWidth);
				// 选择一个最小的比例值作为 inSampleSize 值, 这样能够保证
				// 保证最终的图像的尺寸大于或等于所要求的高度和宽度.
				inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
			}
			return inSampleSize;
		}

	}

	/**
	 * 把bytes一次性写入file并关闭
	 * 
	 * @param file
	 * @param bytes
	 * @throws IOException
	 */
	public static void writeToFile(final File file, final Bitmap bitmap) {
		if (bitmap == null) {
			return;
		}
		try {
			// 将Bitmap压缩成JPG编码，质量为88%存储
			FileOutputStream fos = new FileOutputStream(file);
			bitmap.compress(Bitmap.CompressFormat.PNG, 88, fos);// 除了PNG还有很多常见格式，如jpeg等。
			fos.flush();
			fos.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

	}
}