如何获取我在 Imageview 上为 Android Studio 选择的图像的图像文件名？

Question

我在 android studio 上有这个简单的图片查看器，当我 select 图片时，我希望 toast 显示图片名称（例如“image.jpeg”） .我应该在 toast.maketext 部分添加哪一行以使其显示图片名称？我试过 selectedImageUri.getLastPathSegment() 但它给了我文档 ID。

package com.example.pushnotifications;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

// One Button
Button BSelectImage;

// One Preview Image
ImageView IVPreviewImage;

// constant to compare
// the activity result code
int SELECT_PICTURE = 200;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // register the UI widgets with their appropriate IDs
    BSelectImage = findViewById(R.id.BSelectImage);
    IVPreviewImage = findViewById(R.id.IVPreviewImage);

    // handle the Choose Image button to trigger
    // the image chooser function
    BSelectImage.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            imageChooser();
        }
    });

}

// this function is triggered when
// the Select Image Button is clicked
void imageChooser() {

    // create an instance of the
    // intent of the type image
    Intent i = new Intent();
    i.setType("image/*");
    i.setAction(Intent.ACTION_GET_CONTENT);

    // pass the constant to compare it
    // with the returned requestCode
    startActivityForResult(Intent.createChooser(i, "Select Picture"), SELECT_PICTURE);
}

// this function is triggered when user
// selects the image from the imageChooser
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (resultCode == RESULT_OK) {

        // compare the resultCode with the
        // SELECT_PICTURE constant
        if (requestCode == SELECT_PICTURE) {
            // Get the url of the image from data
            Uri selectedImageUri = data.getData();
            if (null != selectedImageUri) {
                // update the preview image in the layout
                IVPreviewImage.setImageURI(selectedImageUri);

            }

            
            Toast.makeText(getApplicationContext(), "Selected Image: " + WHAT DO I PUT HERE??, Toast.LENGTH_LONG).show();


        }
        }
    }


}

Answer 1

使用此方法获取 uri 名称

public String getFileName(Uri uri) {
 String result = null;
if (uri.getScheme().equals("content")) {
 Cursor cursor = getContentResolver().query(uri, null, null, null, null);
try {
  if (cursor != null && cursor.moveToFirst()) {
    result = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));
  }
} finally {
  cursor.close();
}
}
if (result == null) {
result = uri.getPath();
int cut = result.lastIndexOf('/');
if (cut != -1) {
  result = result.substring(cut + 1);
}
}
return result;
}

如果名称未获取则同步此依赖项

implementation 'andhradroid.dev:aFilechooser:1.0.1'

并且这一行在活动结果中

val file2 = FileUtils.getFile(context, uri)
Toast.makeText(context, file2.name, Toast.LENGTH_SHORT).show()

Answer 2

根据Android Documentation，您可以使用以下代码。

private String getSelectedImageName(Uri returnUri){
    Uri returnUri = data.getData();
    if(returnUri != null){
        Cursor returnCursor =
                getContentResolver().query(returnUri, null, null, null, null);
        /*
         * Get the column indexes of the data in the Cursor,
         * move to the first row in the Cursor, get the data,
         * and display it.
         */
        int nameIndex = returnCursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
        String fileName = returnCursor.getString(nameIndex)
        
        return fileName ;
    
    }else{
        return "No data found"
    }
}

如何获取我在 Imageview 上为 Android Studio 选择的图像的图像文件名？

How can I get the image file name on the image I selected on Imageview for Android Studio?

java

android

image

imageview