Android 选择文件并返回路径

绝地灬酷狼 2023-06-21 10:29 13阅读 0赞

### Android 选择文件并返回路径 ###

**效果图:**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RyYWN5ZHJhZ29ubHh5_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RyYWN5ZHJhZ29ubHh5_size_16_color_FFFFFF_t_70 1]

1.  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());
        }
    
    }

1.  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);
                }
            });
        }
    
    }

1.  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>

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RyYWN5ZHJhZ29ubHh5_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191212150938891.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RyYWN5ZHJhZ29ubHh5,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RyYWN5ZHJhZ29ubHh5_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20191212153303910.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RyYWN5ZHJhZ29ubHh5,size_16,color_FFFFFF,t_70