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。
1 package com.panhouye.selectfile; 2 3 import android.annotation.SuppressLint; 4 import android.app.Activity; 5 import android.content.ContentUris; 6 import android.content.Context; 7 import android.content.Intent; 8 import android.database.Cursor; 9 import android.net.Uri; 10 import android.os.Build; 11 import android.os.Bundle; 12 import android.os.Environment; 13 import android.provider.DocumentsContract; 14 import android.provider.MediaStore; 15 import android.support.v7.app.AppCompatActivity; 16 import android.view.View; 17 import android.widget.Button; 18 import android.widget.TextView; 19 import android.widget.Toast; 20 21 public class MainActivity extends AppCompatActivity { 22 TextView tv; 23 @Override 24 protected void onCreate(Bundle savedInstanceState) { 25 super.onCreate(savedInstanceState); 26 setContentView(R.layout.activity_main); 27 Button btn = (Button) findViewById(R.id.btn); 28 tv = (TextView) findViewById(R.id.tv); 29 btn.setOnClickListener(new View.OnClickListener() { 30 @Override 31 public void onClick(View v) { 32 Intent intent = new Intent(Intent.ACTION_GET_CONTENT); 33 //intent.setType(“image/*”);//选择图片 34 //intent.setType(“audio/*”); //选择音频 35 //intent.setType(“video/*”); //选择视频 (mp4 3gp 是android支持的视频格式) 36 //intent.setType(“video/*;image/*”);//同时选择视频和图片 37 intent.setType("*/*");//无类型限制 38 intent.addCategory(Intent.CATEGORY_OPENABLE); 39 startActivityForResult(intent, 1); 40 } 41 }); 42 } 43 String path; 44 @Override 45 protected void onActivityResult(int requestCode, int resultCode, Intent data) { 46 if (resultCode == Activity.RESULT_OK) { 47 Uri uri = data.getData(); 48 if ("file".equalsIgnoreCase(uri.getScheme())){//使用第三方应用打开 49 path = uri.getPath(); 50 tv.setText(path); 51 Toast.makeText(this,path+"11111",Toast.LENGTH_SHORT).show(); 52 return; 53 } 54 if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT) {//4.4以后 55 path = getPath(this, uri); 56 tv.setText(path); 57 Toast.makeText(this,path,Toast.LENGTH_SHORT).show(); 58 } else {//4.4以下下系统调用方法 59 path = getRealPathFromURI(uri); 60 tv.setText(path); 61 Toast.makeText(MainActivity.this, path+"222222", Toast.LENGTH_SHORT).show(); 62 } 63 } 64 } 65 66 public String getRealPathFromURI(Uri contentUri) { 67 String res = null; 68 String[] proj = { MediaStore.Images.Media.DATA }; 69 Cursor cursor = getContentResolver().query(contentUri, proj, null, null, null); 70 if(null!=cursor&&cursor.moveToFirst()){; 71 int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); 72 res = cursor.getString(column_index); 73 cursor.close(); 74 } 75 return res; 76 } 77 78 /** 79 * 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 80 */ 81 @SuppressLint("NewApi") 82 public String getPath(final Context context, final Uri uri) { 83 84 final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT; 85 86 // DocumentProvider 87 if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) { 88 // ExternalStorageProvider 89 if (isExternalStorageDocument(uri)) { 90 final String docId = DocumentsContract.getDocumentId(uri); 91 final String[] split = docId.split(":"); 92 final String type = split[0]; 93 94 if ("primary".equalsIgnoreCase(type)) { 95 return Environment.getExternalStorageDirectory() + "/" + split[1]; 96 } 97 } 98 // DownloadsProvider 99 else if (isDownloadsDocument(uri)) { 100 101 final String id = DocumentsContract.getDocumentId(uri); 102 final Uri contentUri = ContentUris.withAppendedId( 103 Uri.parse("content://downloads/public_downloads"), Long.valueOf(id)); 104 105 return getDataColumn(context, contentUri, null, null); 106 } 107 // MediaProvider 108 else if (isMediaDocument(uri)) { 109 final String docId = DocumentsContract.getDocumentId(uri); 110 final String[] split = docId.split(":"); 111 final String type = split[0]; 112 113 Uri contentUri = null; 114 if ("image".equals(type)) { 115 contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; 116 } else if ("video".equals(type)) { 117 contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI; 118 } else if ("audio".equals(type)) { 119 contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; 120 } 121 122 final String selection = "_id=?"; 123 final String[] selectionArgs = new String[]{split[1]}; 124 125 return getDataColumn(context, contentUri, selection, selectionArgs); 126 } 127 } 128 // MediaStore (and general) 129 else if ("content".equalsIgnoreCase(uri.getScheme())) { 130 return getDataColumn(context, uri, null, null); 131 } 132 // File 133 else if ("file".equalsIgnoreCase(uri.getScheme())) { 134 return uri.getPath(); 135 } 136 return null; 137 } 138 139 /** 140 * Get the value of the data column for this Uri. This is useful for 141 * MediaStore Uris, and other file-based ContentProviders. 142 * 143 * @param context The context. 144 * @param uri The Uri to query. 145 * @param selection (Optional) Filter used in the query. 146 * @param selectionArgs (Optional) Selection arguments used in the query. 147 * @return The value of the _data column, which is typically a file path. 148 */ 149 public String getDataColumn(Context context, Uri uri, String selection, 150 String[] selectionArgs) { 151 152 Cursor cursor = null; 153 final String column = "_data"; 154 final String[] projection = {column}; 155 156 try { 157 cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, 158 null); 159 if (cursor != null && cursor.moveToFirst()) { 160 final int column_index = cursor.getColumnIndexOrThrow(column); 161 return cursor.getString(column_index); 162 } 163 } finally { 164 if (cursor != null) 165 cursor.close(); 166 } 167 return null; 168 } 169 170 /** 171 * @param uri The Uri to check. 172 * @return Whether the Uri authority is ExternalStorageProvider. 173 */ 174 public boolean isExternalStorageDocument(Uri uri) { 175 return "com.android.externalstorage.documents".equals(uri.getAuthority()); 176 } 177 178 /** 179 * @param uri The Uri to check. 180 * @return Whether the Uri authority is DownloadsProvider. 181 */ 182 public boolean isDownloadsDocument(Uri uri) { 183 return "com.android.providers.downloads.documents".equals(uri.getAuthority()); 184 } 185 186 /** 187 * @param uri The Uri to check. 188 * @return Whether the Uri authority is MediaProvider. 189 */ 190 public boolean isMediaDocument(Uri uri) { 191 return "com.android.providers.media.documents".equals(uri.getAuthority()); 192 } 193 }
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