我使用下面的代码将图片上传到firebase存储，但是当图片上传时，我希望能够使用下载网址调用图像。这可能吗？
ViewUserMapActivity
package uk.co.jaunt_app.jaunt;
import android.app.ProgressDialog;
import android.content.Intent;
import android.graphics.Bitmap;
import android.location.Location;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.v4.app.FragmentActivity;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MapStyleOptions;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.UploadTask;
import java.util.UUID;
import static uk.co.jaunt_app.jaunt.R.id.MapDistance;
import static uk.co.jaunt_app.jaunt.R.id.map;
public class ViewUserMapActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
Button HomeButt;
TextView MapName;
TextView MapStartLocLat;
TextView MapStartLocLong;
TextView MapEndLocLat;
TextView MapEndLocLong;
TextView mapDistance;
Button chooseImg, uploadImg;
ImageView imgView;
int PICK_IMAGE_REQUEST = 111;
Uri filePath;
ProgressDialog pd;
TextView imgUrl;
FirebaseStorage storage = FirebaseStorage.getInstance();
StorageReference storageRef = storage.getReferenceFromUrl("gs://jaunt-ddc86.appspot.com/");
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_user_map);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(map);
mapFragment.getMapAsync(this);
HomeButt = (Button) findViewById(R.id.backHome);
MapName = (TextView) findViewById(R.id.MapName);
MapStartLocLat = (TextView) findViewById(R.id.MapStartLocLat);
MapStartLocLong = (TextView) findViewById(R.id.MapStartLocLong);
MapEndLocLat = (TextView) findViewById(R.id.MapEndLocLat);
MapEndLocLong = (TextView) findViewById(R.id.MapEndLocLong);
mapDistance = (TextView) findViewById(MapDistance);
imgUrl = (TextView) findViewById(R.id.imgurl);
Intent intent = getIntent();
final String mapName = intent.getStringExtra("mapName");
String mapStartLat = intent.getStringExtra("mapStartLat");
String mapStartLong = intent.getStringExtra("mapStartLong");
String mapEndLat = intent.getStringExtra("mapEndLat");
String mapEndLong = intent.getStringExtra("mapEndLong");
MapName.setText(mapName);
MapStartLocLat.setText(mapStartLat);
MapStartLocLong.setText(mapStartLong);
MapEndLocLat.setText(mapEndLat);
MapEndLocLong.setText(mapEndLong);
chooseImg = (Button)findViewById(R.id.chooseImg);
uploadImg = (Button)findViewById(R.id.uploadImg);
imgView = (ImageView)findViewById(R.id.imgView);
pd = new ProgressDialog(this);
pd.setMessage("Uploading....");
chooseImg.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_PICK);
startActivityForResult(Intent.createChooser(intent, "Select Image"), PICK_IMAGE_REQUEST);
}
});
uploadImg.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(filePath != null) {
pd.show();
String imageID = UUID.randomUUID().toString();
StorageReference childRef = storageRef.child(imageID);
//uploading the image
UploadTask uploadTask = childRef.putFile(filePath);
uploadTask.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
pd.dismiss();
Toast.makeText(ViewUserMapActivity.this, "Image Uploaded Successfully", Toast.LENGTH_LONG).show();
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
pd.dismiss();
Toast.makeText(ViewUserMapActivity.this, "Upload Failed -> " + e, Toast.LENGTH_LONG).show();
}
});
}
else {
Toast.makeText(ViewUserMapActivity.this, "Select An Image", Toast.LENGTH_LONG).show();
}
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
filePath = data.getData();
try {
//getting image from gallery
Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), filePath);
//Setting image to ImageView
imgView.setImageBitmap(bitmap);
} catch (Exception e) {
e.printStackTrace();
}
}
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
googleMap.setMapStyle(MapStyleOptions.loadRawResourceStyle(this, R.raw.style_json));
String mapstartlat = MapStartLocLat.getText().toString().trim();
String mapstartlong = MapStartLocLong.getText().toString().trim();
String mapendlat = MapEndLocLat.getText().toString().trim();
String mapendlong = MapEndLocLong.getText().toString().trim();
double startlat = Double.valueOf(mapstartlat);
double startlong = Double.valueOf(mapstartlong);
double endlat = Double.valueOf(mapendlat);
double endlong = Double.valueOf(mapendlong);
LatLng Start = new LatLng(startlat, startlong);
LatLng End = new LatLng(endlat, endlong);
mMap.addMarker(new MarkerOptions().position(Start)
.icon(BitmapDescriptorFactory.fromResource(R.drawable.mappin)));
mMap.addMarker(new MarkerOptions().position(End)
.icon(BitmapDescriptorFactory.fromResource(R.drawable.mappin)));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(End, 6 ));
Location loc1 = new Location("");
loc1.setLatitude(startlat);
loc1.setLongitude(startlong);
Location loc2 = new Location("");
loc2.setLatitude(endlat);
loc2.setLongitude(endlong);
float distanceInMeters = loc1.distanceTo(loc2);
Double value = 0.00062137;
Double distanceValue = (distanceInMeters)*value;
mapDistance.setText(String.format("%.1f mi", distanceValue));
HomeButt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(ViewUserMapActivity.this, MainActivity.class);
startActivity(intent);
}
});
}
}
答案 0 :(得分：3)
在成功回调中使用getDownloadUrl()。上传完成后就会填充。
更多信息here。
答案 1 :(得分：1)
来自Firebase documentation on uploading files：
您可以使用
putFile()方法上传设备上的本地文件，例如来自相机的照片和视频。putFile()获取文件并返回UploadTask，您可以使用该Uri file = Uri.fromFile(new File("path/to/images/rivers.jpg")); StorageReference riversRef = storageRef.child("images/"+file.getLastPathSegment()); uploadTask = riversRef.putFile(file); Task<Uri> urlTask = uploadTask.continueWithTask(new Continuation<UploadTask.TaskSnapshot, Task<Uri>>() { @Override public Task<Uri> then(@NonNull Task<UploadTask.TaskSnapshot> task) throws Exception { if (!task.isSuccessful()) { throw task.getException(); } // Continue with the task to get the download URL return ref.getDownloadUrl(); } }).addOnCompleteListener(new OnCompleteListener<Uri>() { @Override public void onComplete(@NonNull Task<Uri> task) { if (task.isSuccessful()) { Uri downloadUri = task.getResult(); } else { // Handle failures // ... } } });来管理和监控上传状态。String line = "<opr:fld name=fieldName>Value1</opr:fld>"; String regex = "(.*name=)(.*)(>.*>)"; Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(line); matcher.matches(); String result = matcher.group(1) + "\"" + matcher.group(2) + "\"" + matcher.group(3); System.out.println(result);