Android中调用文件管理器并返回选中文件的路径

实际项目中经常需要调用文件管理器，选择下载路径或者上传的本地文件路径。今天就给大家做个demo示范该功能的实现过程。

一、实现效果预览

以下为三星S6的样机测试效果，当然不同手机调用后的效果不一样。

二、代码实现

布局文件很简单，就一个Button和TextView，这里不示范了，直接上实现代码：

 package com.panhouye.selectfile;

 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.content.ContentUris;
 import android.content.Context;
 import android.content.Intent;
 import android.database.Cursor;
 import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Environment;
 import android.provider.DocumentsContract;
 import android.provider.MediaStore;
 import android.support.v7.app.AppCompatActivity;
 import android.view.View;
 import android.widget.Button;
 import android.widget.TextView;
 import android.widget.Toast;

 public class MainActivity extends AppCompatActivity {
     TextView tv;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         Button btn = (Button) findViewById(R.id.btn);
         tv = (TextView) findViewById(R.id.tv);
         btn.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 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, 1);
             }
         });
     }
     String path;
     @Override
     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
         if (resultCode == Activity.RESULT_OK) {
             Uri uri = data.getData();
             if ("file".equalsIgnoreCase(uri.getScheme())){//使用第三方应用打开
                 path = uri.getPath();
                 tv.setText(path);
                 Toast.makeText(this,path+"11111",Toast.LENGTH_SHORT).show();
                 return;
             }
             if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT) {//4.4以后
                 path = getPath(this, uri);
                 tv.setText(path);
                 Toast.makeText(this,path,Toast.LENGTH_SHORT).show();
             } else {//4.4以下下系统调用方法
                 path = getRealPathFromURI(uri);
                 tv.setText(path);
                 Toast.makeText(MainActivity.this, path+"222222", Toast.LENGTH_SHORT).show();
             }
         }
     }

     public String getRealPathFromURI(Uri contentUri) {
         String res = null;
         String[] proj = { MediaStore.Images.Media.DATA };
         Cursor cursor = 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")
     public 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())) {
             return uri.getPath();
         }
         return null;
     }

     /**
      * Get the value of the data column for this Uri. This is useful for
      * MediaStore Uris, and other file-based ContentProviders.
      *
      * @param context       The context.
      * @param uri           The Uri to query.
      * @param selection     (Optional) Filter used in the query.
      * @param selectionArgs (Optional) Selection arguments used in the query.
      * @return The value of the _data column, which is typically a file path.
      */
     public 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.
      */
     public 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.
      */
     public 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.
      */
     public boolean isMediaDocument(Uri uri) {
         return "com.android.providers.media.documents".equals(uri.getAuthority());
     }
 }

三、小结

这是调用系统自带的文件管理，无法保证和控制统一的界面显示，所以大家还是要实现与自己APP统一的文件管理界面，共勉。