我有一个onActivityResult从一个mediastore图像选择返回,我可以获得一个图像使用以下URI:
Uri selectedImage = data.getData();
将this转换为字符串会得到:
content://media/external/images/media/47
或路径给出:
/external/images/media/47
然而,我似乎找不到一种方法将其转换为绝对路径,因为我想将图像加载到位图中,而不必复制到某个地方。我知道这可以使用URI和内容解析器来完成,但这似乎在重新启动手机时中断,我猜MediaStore在重新启动之间没有保持其编号相同。
下面API 19使用这段代码从URI中获取文件路径:
public String getRealPathFromURI(Context context, Uri contentUri) {
Cursor cursor = null;
try {
String[] proj = { MediaStore.Images.Media.DATA };
cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
} finally {
if (cursor != null) {
cursor.close();
}
}
}
我是这样做的:
Uri queryUri = MediaStore.Files.getContentUri("external");
String columnData = MediaStore.Files.FileColumns.DATA;
String columnSize = MediaStore.Files.FileColumns.SIZE;
String[] projectionData = {MediaStore.Files.FileColumns.DATA};
String name = null;
String size = null;
Cursor cursor = getContentResolver().query(contentURI, null, null, null, null);
if ((cursor != null)&&(cursor.getCount()>0)) {
int nameIndex = cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
int sizeIndex = cursor.getColumnIndex(OpenableColumns.SIZE);
cursor.moveToFirst();
name = cursor.getString(nameIndex);
size = cursor.getString(sizeIndex);
cursor.close();
}
if ((name!=null)&&(size!=null)){
String selectionNS = columnData + " LIKE '%" + name + "' AND " +columnSize + "='" + size +"'";
Cursor cursorLike = getContentResolver().query(queryUri, projectionData, selectionNS, null, null);
if ((cursorLike != null)&&(cursorLike.getCount()>0)) {
cursorLike.moveToFirst();
int indexData = cursorLike.getColumnIndex(columnData);
if (cursorLike.getString(indexData) != null) {
result = cursorLike.getString(indexData);
}
cursorLike.close();
}
}
return result;
API 19及以上,图像文件路径从Uri工作完美。我还检查了最新的PIE API 28。
public String getImageFilePath(Uri uri) {
String path = null, image_id = null;
Cursor cursor = getContentResolver().query(uri, null, null, null, null);
if (cursor != null) {
cursor.moveToFirst();
image_id = cursor.getString(0);
image_id = image_id.substring(image_id.lastIndexOf(":") + 1);
cursor.close();
}
cursor = getContentResolver().query(android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, MediaStore.Images.Media._ID + " = ? ", new String[]{image_id}, null);
if (cursor!=null) {
cursor.moveToFirst();
path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
cursor.close();
}
return path;
}
在这里,我将向您展示如何创建一个BROWSE按钮,当您单击它时,它将打开SD卡,您将选择一个文件,结果您将获得所选文件的文件名和文件路径:
一个你要按的按钮
browse.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
Intent intent = new Intent();
intent.setAction(Intent.ACTION_PICK);
Uri startDir = Uri.fromFile(new File("/sdcard"));
startActivityForResult(intent, PICK_REQUEST_CODE);
}
});
获取结果文件名和文件路径的函数
protected void onActivityResult(int requestCode, int resultCode, Intent intent)
{
if (requestCode == PICK_REQUEST_CODE)
{
if (resultCode == RESULT_OK)
{
Uri uri = intent.getData();
if (uri.getScheme().toString().compareTo("content")==0)
{
Cursor cursor =getContentResolver().query(uri, null, null, null, null);
if (cursor.moveToFirst())
{
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);//Instead of "MediaStore.Images.Media.DATA" can be used "_data"
Uri filePathUri = Uri.parse(cursor.getString(column_index));
String file_name = filePathUri.getLastPathSegment().toString();
String file_path=filePathUri.getPath();
Toast.makeText(this,"File Name & PATH are:"+file_name+"\n"+file_path, Toast.LENGTH_LONG).show();
}
}
}
}
}