Android 中选择本地文件并获取文件路径
1. 使用Intent.ACTION_GET_CONTENT（实用于较简朴的文件选择场景）步调一：在Activity中启动文件选择器
private static final int FILE_SELECT_CODE = 1;
private void showFileChooser() {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("*/*"); // 设置为选择所有类型文件，可根据需要修改，如 "application/pdf" 表示只选择 PDF 文件
startActivityForResult(intent, FILE_SELECT_CODE);
}
步调二：在onActivityResult中获取文件Uri并尝试转换为路径
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == FILE_SELECT_CODE && resultCode == RESULT_OK) {
Uri uri = data.getData();
String filePath = getPathFromUri(uri);
Log.d("File Path", filePath);
// 可以在这里对获取到的文件路径进行后续操作，如读取文件内容等
}
}
步调三：实现getPathFromUri方法来处置惩罚不同类型的Uri获取路径
public String getPathFromUri(Uri uri) {
String path = null;
if ("content".equalsIgnoreCase(uri.getScheme())) {
Cursor cursor = getContentResolver().query(uri, null, null, null, null);
if (cursor!= null) {
if (cursor.moveToFirst()) {
int index = cursor.getColumnIndex("_data");
if (index > -1) {
path = cursor.getString(index);
}
}
cursor.close();
}
} else if ("file".equalsIgnoreCase(uri.getScheme())) {
path = uri.getPath();
}
return path;
}
2. 使用Storage Access Framework（更通用且安全，特殊是对于 Android 4.4 及以上版本）
步调一：启动文件选择器
private static final int REQUEST_CODE_OPEN_DOCUMENT = 1;
private void openDocument() {
Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("*/*");
startActivityForResult(intent, REQUEST_CODE_OPEN_DOCUMENT);
}
步调二：在onActivityResult中处置惩罚选择结果并获取路径
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_CODE_OPEN_DOCUMENT && resultCode == RESULT_OK) {
Uri uri = data.getData();
String filePath = getPathFromSAFUri(uri);
Log.d("File Path", filePath);
}
}
步调三：实现getPathFromSAFUri方法来处置惩罚SAF相关的Uri获取路径
public String getPathFromSAFUri(Uri uri) {
if (DocumentsContract.isDocumentUri(this, uri)) {
if (isExternalStorageDocument(uri)) {
String docId = DocumentsContract.getDocumentId(uri);
String[] split = docId.split(":");
if ("primary".equals(split)) {
return Environment.getExternalStorageDirectory() + "/" + split;
}
} else if (isDownloadsDocument(uri)) {
String id = DocumentsContract.getDocumentId(uri);
Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
return getDataColumn(this, contentUri, null, null);
} else if (isMediaDocument(uri)) {
String docId = DocumentsContract.getDocumentId(uri);
String[] split = docId.split(":");
String type = split;
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;
}
String selection = "_id=?";
String[] selectionArgs = new String[]{split};
return getDataColumn(this, contentUri, selection, selectionArgs);
}
} else if ("content".equalsIgnoreCase(uri.getScheme())) {
return getDataColumn(this, uri, null, null);
} else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
private boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
private boolean isDownloadsDocument(uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
private boolean isMediaDocument(uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
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()) {
int columnIndex = cursor.getColumnIndexOrThrow(column);
return cursor.getString(columnIndex);
}
} finally {
if (cursor!= null)
cursor.close();
}
return null;
}
至此就完成了在Android中选择文件并获取路径的方法，可以根据自己的需求举行调解
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