Android 选择文件(调用系统文件管理器)

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;
import android.widget.Toast;

/**
* CreateTime 2018/1/12 11:35
* Author LiuShiHua
* Description：选择文件返回
*
* 调用方式如下
*/
//选择文件【调用系统的文件管理】
//        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
//        //intent.setType(“image/*”);//选择图片
//        //intent.setType(“audio/*”); //选择音频
//        //intent.setType(“video/*”); //选择视频 （mp4 3gp 是android支持的视频格式）
//        //intent.setType(“video/*;image/*”);//同时选择视频和图片
//        intent.setType("*/*");//无类型限制
//        intent.addCategory(Intent.CATEGORY_OPENABLE);
//        startActivityForResult(intent, REQUEST_CHOOSEFILE);

//@Override
//protected void onActivityResult(int requestCode,int resultCode,Intent data){//选择文件返回
//        super.onActivityResult(requestCode,resultCode,data);
//        if(resultCode==RESULT_OK){
//        switch(requestCode){
//              case REQUEST_CHOOSEFILE:
//              Uri uri=data.getData();
//               chooseFilePath=FileChooseUtil.getInstance(this).getChooseFileResultPath(uri);
//              Log.d(TAG,"选择文件返回："+chooseFilePath);
//              sendFileMessage(chooseFilePath);
//               break;
//        }
//    }
//}

public class FileChooseUtil {

private Context context;
private static FileChooseUtil util = null;

private FileChooseUtil(Context context) {
this.context = context;
}

public static FileChooseUtil getInstance(Context context) {
if (util == null) {
util = new FileChooseUtil(context);
}
return util;
}

/**
* 对外接口  获取uri对应的路径
*
* @param uri
* @return
*/
public String getChooseFileResultPath(Uri uri) {
String chooseFilePath = null;
if ("file".equalsIgnoreCase(uri.getScheme())) {//使用第三方应用打开
chooseFilePath = uri.getPath();
Toast.makeText(context, chooseFilePath, Toast.LENGTH_SHORT).show();
return chooseFilePath;
}
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT) {//4.4以后
chooseFilePath = getPath(context, uri);
} else {//4.4以下下系统调用方法
chooseFilePath = getRealPathFromURI(uri);
}
return chooseFilePath;
}

private String getRealPathFromURI(Uri contentUri) {
String res = null;
String[] proj = {MediaStore.Images.Media.DATA};
Cursor cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
if (null != cursor && cursor.moveToFirst()) {
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
res = cursor.getString(column_index);
cursor.close();
}
return res;
}

/**
* 专为Android4.4设计的从Uri获取文件绝对路径，以前的方法已不好使
*/
@SuppressLint("NewApi")
private 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 getDataColumn(context, uri, null, null);

}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
uri.getPath();

}
return null;
}

private 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 column_index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(column_index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is ExternalStorageProvider.
*/
private boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is DownloadsProvider.
*/
private boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is MediaProvider.
*/
private boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
}