Android 选择文件并返回路径
16lz
2021-01-23
Android 选择文件并返回路径
效果图:
- 文件选择器类
public class ContentUriUtil { /** * Get a file path from a Uri. This will get the the path for Storage Access * Framework Documents, as well as the _data field for the MediaStore and * other file-based ContentProviders. * * @param context The context. * @param uri The Uri to query. * @author paulburke */ 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]; } // TODO handle non-primary volumes } // 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; } /** ** * 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 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; } /** * @param uri The Uri to check. * @return Whether the Uri authority is ExternalStorageProvider. */ public static 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 static 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 static boolean isMediaDocument(Uri uri) { return "com.android.providers.media.documents".equals(uri.getAuthority()); } /** * @param uri The Uri to check. * @return Whether the Uri authority is Google Photos. */ public static boolean isGooglePhotosUri(Uri uri) { return "com.google.android.apps.photos.content".equals(uri.getAuthority()); }}- 主界面
public class Main2Activity extends AppCompatActivity { private TextView filePath; private Button btnSelect; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main2); filePath = findViewById(R.id.file_path); btnSelect = findViewById(R.id.open_file); btnSelect.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { openSystemFile(); } }); } public void openSystemFile() { Intent intent = new Intent(Intent.ACTION_GET_CONTENT); // 所有类型 intent.setType("*/*"); intent.addCategory(Intent.CATEGORY_DEFAULT); intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION); try { startActivityForResult(Intent.createChooser(intent, "请选择文件"), 1); } catch (ActivityNotFoundException e) { e.printStackTrace(); Toast.makeText(Main2Activity.this, "请安装文件管理器", Toast.LENGTH_SHORT).show(); } } @Override protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == 1 && resultCode == Activity.RESULT_OK) { //Get the Uri of the selected file Uri uri = data.getData(); if (null != uri) { String path = ContentUriUtil.getPath(this, uri); Log.i("filepath", " = " + path); updateFilePath(path); } } } private void updateFilePath(final String path) { runOnUiThread(new Runnable() { @Override public void run() { filePath.setText(path); } }); }}- 界面文件
<?xml version="1.0" encoding="utf-8"?><androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".Main2Activity"> <TextView android:id="@+id/file_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="文件路径:" android:textSize="18sp" android:textColor="#353535" android:layout_marginTop="60dp" android:layout_marginStart="40dp" app:layout_constraintTop_toTopOf="parent" app:layout_constraintLeft_toLeftOf="parent"/> <TextView android:id="@+id/file_path" android:layout_width="160dp" android:layout_height="wrap_content" android:layout_marginStart="10dp" app:layout_constraintTop_toTopOf="@id/file_name" app:layout_constraintBottom_toBottomOf="@id/file_name" app:layout_constraintLeft_toRightOf="@id/file_name"/> <Button android:id="@+id/open_file" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="选择文件" android:background="@drawable/button_corner" app:layout_constraintLeft_toRightOf="@id/file_path" app:layout_constraintTop_toTopOf="@id/file_name" app:layout_constraintBottom_toBottomOf="@id/file_name"/></androidx.constraintlayout.widget.ConstraintLayout>更多相关文章
- Android——使用GridView制作二维布局界面(行、列分布)
- 关于android xml文件中 android:id="@+id/my_button"的含义疑问
- android 写文件权限
- AndroidMenifest.xml(Android清单文件)内部代码分析
- Android布局文件中的属性含义
- Android界面设计之：使用水平视图切换
- Android开发进阶：如何读写Android文件
- android studio 使用adb命令传递文件到android设备
- android修改手机虚拟设备管理器路径