读取本地相册兼容了小米

权当记录了；
首先想要调用相册需要执行Intent过去；

 private void intentimage() {Intent getAlbum = new Intent(Intent.ACTION_GET_CONTENT);getAlbum.setType(IMAGE_TYPE);startActivityForResult(getAlbum, IMAGE_CODE);}

private final String IMAGE_TYPE = "image/*";private final int IMAGE_CODE = 1;private final int TAKE_PHOTO = 0;private final int PHOTO_REQUEST_CUT=2;

需要的一些变量；
然后就是在activity的onActivityResult的方法里面得到图片的Url,这里面有个坑，就是小米的手机的不支持这么拿，会报空指针；

 public void onActivityResult(int requestCode, int resultCode, Intent data) {ContentResolver resolver = this.getContentResolver();if (data != null) {switch (requestCode) {case TAKE_PHOTO: //拍摄图片并选择// 两种方式 获取拍好的图片Toast.makeText(this, "拍照的", Toast.LENGTH_SHORT).show();if (data.getData() != null || data.getExtras() != null) {//防止没有返回结果Uri uri = data.getData();if (uri == null) {Toast.makeText(this, "找不到图片", Toast.LENGTH_SHORT).show();}}break;case IMAGE_CODE:Uri originalUri = data.getData();crop(originalUri);/* Toast.makeText(this, originalUri.getPath(), Toast.LENGTH_SHORT).show();String path1 = MiPictureHelper.getPath(this, originalUri);Bitmap bitmap = PictureUtils.getSmallBitmap(path1, 60, 60);activityCompleteuserPortrait.setImageBitmap(bitmap);saveBitmap(bitmap);*/break;case PHOTO_REQUEST_CUT:// 从剪切图片返回的数据if (data != null) {Bitmap bitmap = data.getParcelableExtra("data");saveBitmap(bitmap);activityCompleteuserPortrait.setImageBitmap(bitmap);}}}super.onActivityResult(requestCode, resultCode, data);}

上面加入了剪切圆形图片，不需要的可以直接去掉，圆形图片的方法；

  /*      * 剪切图片      */private void crop(Uri uri) {// 裁剪图片意图Intent intent = new Intent("com.android.camera.action.CROP");intent.setDataAndType(uri, "image/*");intent.putExtra("crop", "true");// 裁剪框的比例，1：1intent.putExtra("aspectX", 1);intent.putExtra("aspectY", 1);// 裁剪后输出图片的尺寸大小intent.putExtra("outputX", 250);intent.putExtra("outputY", 250);intent.putExtra("outputFormat", "JPEG");// 图片格式intent.putExtra("noFaceDetection", true);// 取消人脸识别intent.putExtra("return-data", true);// 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_CUTstartActivityForResult(intent, PHOTO_REQUEST_CUT);}

关键的一个工具类；兼容了小米的地方；

public class MiPictureHelper {@SuppressLint("NewApi")public static String getPath(final Context context, final Uri uri) {final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;// DocumentProviderif (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {// ExternalStorageProviderif (isExternalStorageDocument(uri)) {final String docId = DocumentsContract.getDocumentId(uri);final String[] split = docId.split(":");final String type = split[0];if ("primary".equalsIgnoreCase(type)) {return Environment.getExternalStorageDirectory() + "/" + split[1];}}// DownloadsProviderelse if (isDownloadsDocument(uri)) {final String id = DocumentsContract.getDocumentId(uri);final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"),Long.valueOf(id));return getDataColumn(context, contentUri, null, null);}// MediaProviderelse if (isMediaDocument(uri)) {final String docId = DocumentsContract.getDocumentId(uri);final String[] split = docId.split(":");final String type = split[0];Uri contentUri = null;if ("image".equals(type)) {contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;} else if ("video".equals(type)) {contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;} else if ("audio".equals(type)) {contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;}final String selection = "_id=?";final String[] selectionArgs = new String[] { split[1] };return getDataColumn(context, contentUri, selection,selectionArgs);}}// MediaStore (and general)else if ("content".equalsIgnoreCase(uri.getScheme())) {// Return the remote addressif (isGooglePhotosUri(uri))return uri.getLastPathSegment();return getDataColumn(context, uri, null, null);}// Fileelse if ("file".equalsIgnoreCase(uri.getScheme())) {return uri.getPath();}return null;}public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {Cursor cursor = null;final String column = "_data";final String[] projection = { column };try {cursor = context.getContentResolver().query(uri, projection,selection, selectionArgs, null);if (cursor != null && cursor.moveToFirst()) {final int index = cursor.getColumnIndexOrThrow(column);return cursor.getString(index);}} finally {if (cursor != null)cursor.close();}return null;}public static boolean isExternalStorageDocument(Uri uri) {return "com.android.externalstorage.documents".equals(uri.getAuthority());}public static boolean isDownloadsDocument(Uri uri) {return "com.android.providers.downloads.documents".equals(uri.getAuthority());}public static boolean isMediaDocument(Uri uri) {return "com.android.providers.media.documents".equals(uri.getAuthority());}private static boolean isGooglePhotosUri(Uri uri) {return "com.google.android.apps.photos.content".equals(uri.getAuthority());}
}

一个图片压缩的工具类；

public class PictureUtils {/*** 计算图片的缩放值** @param options* @param reqWidth* @param reqHeight* @return*/public static int calculateInSampleSize(BitmapFactory.Options options,int reqWidth, int reqHeight) {// Raw height and width of imagefinal int height = options.outHeight;final int width = options.outWidth;int inSampleSize = 1;if (height > reqHeight || width > reqWidth) {// Calculate ratios of height and width to requested height and// widthfinal int heightRatio = Math.round((float) height/ (float) reqHeight);final int widthRatio = Math.round((float) width / (float) reqWidth);// Choose the smallest ratio as inSampleSize value, this will// guarantee// a final image with both dimensions larger than or equal to the// requested height and width.inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;}return inSampleSize;}/*** 根据路径获得突破并压缩返回bitmap用于显示** @param filePath* @return*/public static Bitmap getSmallBitmap(String filePath, int reqWidth, int reqHeight) {final BitmapFactory.Options options = new BitmapFactory.Options();options.inJustDecodeBounds = true;  //只返回图片的大小信息BitmapFactory.decodeFile(filePath, options);// Calculate inSampleSize//options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);options.inSampleSize = 5;// Decode bitmap with inSampleSize setoptions.inJustDecodeBounds = false;return BitmapFactory.decodeFile(filePath, options);}
}

附上一个读取本地图片并且保存到指定的文件夹的的；

private String portrait;public void saveBitmap(Bitmap bm) {portrait = Environment.getExternalStorageDirectory().getPath() + "/taose/" + System.currentTimeMillis() + ".jpg";File file=new File(Environment.getExternalStorageDirectory().getPath() + "/taose/");file.mkdirs();File f = new File(portrait);Log.i("创建成功了么","chenggl");/*  if (f.exists()) {f.delete();}*/try {FileOutputStream out = new FileOutputStream(f);bm.compress(Bitmap.CompressFormat.PNG, 90, out);out.flush();out.close();} catch (FileNotFoundException e) {// TODO Auto-generated catch blockLog.i("创建成功了么","chenggl12321");e.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blockLog.i("创建成功了么","chenggl6666666666");e.printStackTrace();}}

好了图片这块就到这了

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