android 解决小米手机上选择照片路径为null情况

下返回的路径 为null,在网上搜索了下解决方案,现在把解决方案记录下：

这是在onActivityResult方法中执行的,

if (data == null) {
                return;
            }
            uri = data.getData();
            uri = geturi(data);//解决方案
            String[] proj = { MediaStore.Images.Media.DATA };
            Cursor cursor = managedQuery(uri, proj, null, null, null);
            if(cursor!=null){
                int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                cursor.moveToFirst();
                String path = cursor.getString(column_index);// 图片在的路径
                Intent intent3 = new Intent(this, SYClipActivity.class);
                intent3.putExtra("path", path);
                startActivityForResult(intent3, IMAGE_COMPLETE);
            }

/**
     * 解决小米手机上获取图片路径为null的情况
     * @param intent
     * @return
     */
     public Uri geturi(android.content.Intent intent) {
            Uri uri = intent.getData();
            String type = intent.getType();
            if (uri.getScheme().equals("file") && (type.contains("image/"))) {
                String path = uri.getEncodedPath();
                if (path != null) {
                    path = Uri.decode(path);
                    ContentResolver cr = this.getContentResolver();
                    StringBuffer buff = new StringBuffer();
                    buff.append("(").append(Images.ImageColumns.DATA).append("=")
                            .append("'" + path + "'").append(")");
                    Cursor cur = cr.query(Images.Media.EXTERNAL_CONTENT_URI,
                            new String[] { Images.ImageColumns._ID },
                            buff.toString(), null, null);
                    int index = 0;
                    for (cur.moveToFirst(); !cur.isAfterLast(); cur.moveToNext()) {
                        index = cur.getColumnIndex(Images.ImageColumns._ID);
                        // set _id value
                        index = cur.getInt(index);
                    }
                    if (index == 0) {
                        // do nothing
                    } else {
                        Uri uri_temp = Uri
                                .parse("content://media/external/images/media/"
                                        + index);
                        if (uri_temp != null) {
                            uri = uri_temp;
                        }
                    }
                }
            }
            return uri;
        }

在此记录下,

来源：http://blog.csdn.net/coderinchina/article/details/50799501

http://blog.csdn.net/iamwutianbao/article/details/52459509

小米手机选择了图片之后，小米机会崩掉（别的机子，啥版本都没问题）。看异常信息，指示cursor.moveToFirst()，空指针异常。也就是说，cursor为空。是uri的问题，4.4之前，返回的是包含图片绝对路劲的，4.4之后，返回的不再是绝对路劲了，而是一个图片的编码。小米不论版本高低，小米机会崩掉，得到的只是一个图片编码。这时需要去转换为绝对路径，才能方便使用。下面方法是可以得到绝对路径的方法，是大神封装好了，封装成了一个pictureHelper工具类。

吐槽一下，除了小米，用ACTION_PICK，都能得到一个图片的绝对路径。如果是小米，用ACTION_PICK，就需要去转化了。但是，小米用ACTION_GET_CONTENT或者ACTION_OPEN_DOCUMENT，低版本，也能得到绝对路径。。最后统一的处理方法就是，用ACTION_GET_CONTENT，然后分版本处理，低版本还是旧的方法，高版本，用pictureHelper工具类处理得到绝对路径。

package com.xxxe.utils;

import android.annotation.SuppressLint;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;

/**
 *  小米手机获取本地相册图片出现空指针异常处理类
 * @author dec
 *
 */

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;
        // DocumentProvider
        if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
            // ExternalStorageProvider
            if (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];
                }
            }
            // DownloadsProvider
            else 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);
            }
            // MediaProvider
            else 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 address
            if (isGooglePhotosUri(uri))
                return uri.getLastPathSegment();
            return getDataColumn(context, uri, null, null);
        }
        // File
        else 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());
    }

}

如果是想要获取相册中图片的路径，直接这样调用：

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (requestCode) {
        case PICK_PICTURE:
        // 选取照片
        if(data!=null){
            try {
                Uri uri = data.getData();
                String pickPath = MiPictureHelper.getPath(mContext, uri);  // 获取图片路径的方法调用
                System.out.println("图片路径 -->> " + pickPath);
                }
            }
        }
    }
}

====================== 我是一条分割线 ==========================

下面是其他开发者的处理方法

* 解决小米手机上获取图片路径为null的情况
* @param intent
* @return
*/
public Uri getPictureUri(android.content.Intent intent) {
       Uri uri = intent.getData();
       String type = intent.getType();
       if (uri.getScheme().equals("file") && (type.contains("image/"))) {
           String path = uri.getEncodedPath();
           if (path != null) {
               path = Uri.decode(path);
               ContentResolver cr = this.getContentResolver();
               StringBuffer buff = new StringBuffer();
               buff.append("(").append(Images.ImageColumns.DATA).append("=")
                       .append("'" + path + "'").append(")");
               Cursor cur = cr.query(Images.Media.EXTERNAL_CONTENT_URI,
                       new String[] { Images.ImageColumns._ID },
                       buff.toString(), null, null);
               int index = 0;
               for (cur.moveToFirst(); !cur.isAfterLast(); cur.moveToNext()) {
                   index = cur.getColumnIndex(Images.ImageColumns._ID);
                   // set _id value
                   index = cur.getInt(index);
               }
               if (index == 0) {
                   // do nothing
               } else {
                   Uri uri_temp = Uri
                           .parse("content://media/external/images/media/"
                                   + index);
                   if (uri_temp != null) {
                       uri = uri_temp;
                   }
               }
           }
       }
       return uri;
   }

他们这样调用方法：

<span style="white-space:pre">    </span>if (data == null) {
        return;
    }
    uri = data.getData();
    uri = getPictureUri(data); // 方法调用
        String[] proj = { MediaStore.Images.Media.DATA };
        Cursor cursor = managedQuery(uri, proj, null, null, null);
        if(cursor!=null) {
        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                cursor.moveToFirst();
                String path = cursor.getString(column_index);// 图片在的路径
                Intent intent3 = new Intent(this, SYClipActivity.class);
                intent3.putExtra("path", path);
                startActivityForResult(intent3, IMAGE_COMPLETE);
    }