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,

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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);

}

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/**

* 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。

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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：

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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

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* 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：

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<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);

}