我有一个 ImageButton。每当我们单击 ImageButton 时，相机 Intent 就会打开，我们就会拍一张照片。一切正常，直到这里一切都好。那么，如何将此相机 Intent 图像上传到 Firebase 并进行身份验证？我找不到任何认为我们如此的教程视频，但我尝试使用名为 submit 的函数名称对图像进行编码。从这里我不知道该怎么办
package com.example.android.besafe;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.media.Image;
import android.net.Uri;
import android.os.storage.StorageManager;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.Toast;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.OnProgressListener;
import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.UploadTask;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import static com.example.android.besafe.R.id.imageview;
public class CameraActivity extends AppCompatActivity {
private ImageButton mProfileImage;
Bitmap photo;
private static final int CAMERA_REQ = 1;
StorageReference mstorageRef;
String userId;
private FirebaseAuth mAuth;
FirebaseUser firebaseUser;
FirebaseDatabase firebaseDatabase;
DatabaseReference ref;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
mProfileImage = (ImageButton) findViewById(R.id.btnselect);
firebaseDatabase = FirebaseDatabase.getInstance();
ref = firebaseDatabase.getReference("ProfileInfo");
mAuth = FirebaseAuth.getInstance();
firebaseUser = mAuth.getCurrentUser();
userId = firebaseUser.getUid();
mProfileImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_REQ);
}
});
}
public void submit(View v){
ByteArrayOutputStream stream = new ByteArrayOutputStream();
photo.compress(Bitmap.CompressFormat.JPEG, 100, stream);
byte[] b = stream.toByteArray();
StorageReference storageReference =mstorageRef.child("documentImages").child(userId).child("noplateImg");
//StorageReference filePath = FirebaseStorage.getInstance().getReference().child("profile_images").child(userID);
storageReference.putBytes(b).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
Uri downloadUrl = taskSnapshot.getDownloadUrl();
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Toast.makeText(CameraActivity.this,"failed",Toast.LENGTH_LONG).show();
}
});
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAMERA_REQ && resultCode ==RESULT_OK) {
photo = (Bitmap) data.getExtras().get("data");
}
}
}
最佳答案
我在您的代码中发现了两个错误，您没有调用 submit() 方法，因此它永远不会执行。
第二次您没有创建 mstorageRef 实例。
检查下面的代码，我测试并上传了图像。为了简单起见，我在没有用户身份验证的情况下执行此操作。
public class CameraActivity extends AppCompatActivity {
private ImageButton mProfileImage;
Bitmap photo;
private static final int CAMERA_REQ = 1;
StorageReference mstorageRef;
String userId;
private FirebaseAuth mAuth;
FirebaseUser firebaseUser;
FirebaseDatabase firebaseDatabase;
DatabaseReference ref;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mProfileImage = (ImageButton) findViewById(R.id.image_holder);
firebaseDatabase = FirebaseDatabase.getInstance();
ref = firebaseDatabase.getReference("ProfileInfo");
mAuth = FirebaseAuth.getInstance();
firebaseUser = mAuth.getCurrentUser();
// userId = firebaseUser.getUid();
mProfileImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_REQ);
}
});
}
public void submit(){
ByteArrayOutputStream stream = new ByteArrayOutputStream();
photo.compress(Bitmap.CompressFormat.JPEG, 100, stream);
byte[] b = stream.toByteArray();
StorageReference storageReference =FirebaseStorage.getInstance().getReference().child("documentImages").child("noplateImg");
//StorageReference filePath = FirebaseStorage.getInstance().getReference().child("profile_images").child(userID);
storageReference.putBytes(b).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
Uri downloadUrl = taskSnapshot.getDownloadUrl();
Toast.makeText(CameraActivity.this, "uploaded", Toast.LENGTH_SHORT).show();
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Toast.makeText(CameraActivity.this,"failed",Toast.LENGTH_LONG).show();
}
});
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAMERA_REQ && resultCode ==RESULT_OK) {
photo = (Bitmap) data.getExtras().get("data");
submit();
}
}
}
需要记住的事情
如果不使用用户身份验证，请检查 Firebase 存储读写权限是否设置为允许。
相机是危险权限，需要征得用户许可才能使用。在 list 和代码中添加使用相机的权限
确保您的互联网/Wi-Fi 已开启
关于Android 将相机 Intent 图像发送到 Firebase，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48124441/