Android本地图片选择并裁剪工具类详解手机开发

[Java]代码    

import java.io.FileNotFoundException; 
import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.net.Uri; 
import android.os.Environment; 
import android.provider.MediaStore; 
 
/** 
 * 选择本地图片工具类 
 * <br> 
 * 因为直接获取图片容易崩溃，所以直接存入SD卡，再获取 
 * <br> 
 * 又因为写法不正确容易导致部分机型无法使用，所以封装起来复用 
 * <br> 
 * 使用方法： 
 * <br> 
 * 1、调用getByAlbum、getByCamera去获取图片 
 * <br> 
 * 2、在onActivityResult中调用本工具类的onActivityResult方法进行处理 
 * <br> 
 * 3、onActivityResult返回的Bitmap记得空指针判断 
 *  
 * <br><br> 
 * PS：本工具类只能处理裁剪图片，如果不想裁剪，不使用本工具类的onActivityResult，自己做处理即可 
 *  
 * @author linin630 
 * 
 */ 
public class SelectPicUtil { 
	 
	/**临时存放图片的地址，如需修改，请记得创建该路径下的文件夹*/ 
	private static final String lsimg = "file:///sdcard/temp.jpg"; 
	 
	public static final int GET_BY_ALBUM = 801;//如果有冲突，记得修改 
	public static final int GET_BY_CAMERA = 802;//如果有冲突，记得修改 
	public static final int CROP = 803;//如果有冲突，记得修改 
	 
	/**从相册获取图片*/ 
	public static void getByAlbum(Activity act){ 
		Intent getAlbum = new Intent(Intent.ACTION_GET_CONTENT); 
		getAlbum.setType("image/*"); 
		act.startActivityForResult(getAlbum, GET_BY_ALBUM); 
	} 
	 
	/**通过拍照获取图片*/ 
	public static void getByCamera(Activity act){ 
		String state = Environment.getExternalStorageState(); 
		if (state.equals(Environment.MEDIA_MOUNTED)) { 
			Intent getImageByCamera = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
			getImageByCamera.putExtra(MediaStore.EXTRA_OUTPUT, Uri.parse(lsimg)); 
			getImageByCamera.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 0); 
			act.startActivityForResult(getImageByCamera, GET_BY_CAMERA); 
		} else { 
			L.e("请确认已经插入SD卡"); 
		} 
	} 
	/** 
	 * 处理获取的图片，注意判断空指针，默认大小480*480，比例1:1 
	 */ 
	public static Bitmap onActivityResult(Activity act, int requestCode, int resultCode, Intent data){ 
		return onActivityResult(act, requestCode, resultCode, data, 0, 0, 0, 0); 
	} 
	/** 
	 * 处理获取的图片，注意判断空指针 
	 */ 
	public static Bitmap onActivityResult(Activity act, int requestCode, int resultCode, Intent data,  
			int w, int h,int aspectX,int aspectY){ 
		Bitmap bm = null; 
		if (resultCode == Activity.RESULT_OK) { 
			Uri uri = null; 
			switch (requestCode) { 
			case GET_BY_ALBUM: 
				uri = data.getData(); 
				act.startActivityForResult(crop(uri,w,h,aspectX,aspectY),CROP); 
				break; 
			case GET_BY_CAMERA: 
				uri = Uri.parse(lsimg); 
				act.startActivityForResult(crop(uri,w,h,aspectX,aspectY),CROP); 
				break; 
			case CROP: 
				bm = dealCrop(act); 
				break; 
			} 
		} 
		return bm; 
	} 
	 
	/**默认裁剪输出480*480，比例1:1*/ 
	public static Intent crop(Uri uri){ 
		return crop(uri,480,480,1,1); 
	} 
	/** 
	 * 裁剪，例如：输出100*100大小的图片，宽高比例是1:1 
	 * @param w 输出宽 
	 * @param h 输出高 
	 * @param aspectX 宽比例 
	 * @param aspectY 高比例 
	 */ 
	public static Intent crop(Uri uri,int w,int h,int aspectX,int aspectY){ 
		if (w==0&&h==0) { 
			w=h=480; 
		} 
		if (aspectX==0&&aspectY==0) { 
			aspectX=aspectY=1; 
		} 
		Intent intent = new Intent("com.android.camera.action.CROP"); 
		// 照片URL地址 
		intent.setDataAndType(uri, "image/*"); 
		intent.putExtra("crop", "true"); 
		intent.putExtra("aspectX", aspectX); 
		intent.putExtra("aspectY", aspectY); 
		intent.putExtra("outputX", w); 
		intent.putExtra("outputY", h); 
		// 输出路径 
		intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.parse(lsimg)); 
		// 输出格式 
		intent.putExtra("outputFormat", "JPEG"); 
		// 不启用人脸识别 
		intent.putExtra("noFaceDetection", true); 
		intent.putExtra("return-data", false); 
		return intent; 
	} 
	 
	/**处理裁剪，获取裁剪后的图片*/ 
	public static Bitmap dealCrop(Context context){ 
		// 裁剪返回 
		Uri uri = Uri.parse(lsimg); 
		Bitmap bitmap = null; 
		try { 
			bitmap = BitmapFactory.decodeStream(context.getContentResolver().openInputStream(uri)); 
		} catch (FileNotFoundException e) { 
			e.printStackTrace(); 
		} 
		return bitmap; 
	} 
 
}