android - 从相机捕获图像并上传到 Firebase

标签 android firebase android-camera firebase-storage

我正在开发一个简单的博客应用程序，它允许用户将手机图库中的照片和描述上传到 Firebase 服务器。我正在尝试修改我当前的项目以允许用户从相机捕获照片并将其上传到 firebase 服务器。

目前，我能够显示我捕获到 imagebutton 中的图像，但是我无法将我的图像发布到 firebase 服务器(“提交发布”按钮对我的 onclick 功能没有反应)。

我怀疑我的 startPosting() 函数有问题，或者我没有正确编码图像？请帮忙。 

package simpleblog2.emily.example.com.simpleblog2;

import android.app.ProgressDialog;
import android.content.ContentProvider;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.Image;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Toast;

import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.UploadTask;
import com.squareup.picasso.Picasso;

import com.theartofdev.edmodo.cropper.CropImage;

import java.io.File;


public class PostActivity extends AppCompatActivity {

    private ImageButton mSelectImage;
    private EditText mPostTitle;
    private EditText mPostDesc;
    private Button mSubmitBtn;
    private ProgressDialog mProgress;
    private DatabaseReference mDatabase;

    private Uri mImageUri = null;

    private static final int GALLERY_REQUEST = 1;

    private static final int CAMERA_REQUEST_CODE = 1;

    private StorageReference mStorage;

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

        mStorage = FirebaseStorage.getInstance().getReference();
        mDatabase = FirebaseDatabase.getInstance().getReference().child("Blog");

        mSelectImage = (ImageButton) findViewById(R.id.imageSelect);
        mPostTitle = (EditText) findViewById(R.id.titleField);
        mPostDesc = (EditText) findViewById(R.id.descField);
        mSubmitBtn = (Button) findViewById(R.id.submitBtn);

        mProgress = new ProgressDialog(this);

        mSelectImage.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent1 = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                startActivityForResult(intent1, CAMERA_REQUEST_CODE);
                intent1.setType("image/*");

                /*
                Intent galleryIntent = new Intent(Intent.ACTION_GET_CONTENT);
                galleryIntent.setType("image/*");
                startActivityForResult(galleryIntent, GALLERY_REQUEST);
                */
            }
        });

        mSubmitBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startPosting();
            }
        });
    }

    private void startPosting() {

        mProgress.setMessage("Posting to blog...");


        final String title_val = mPostTitle.getText().toString().trim();
        final String desc_val = mPostDesc.getText().toString().trim();
        if (!TextUtils.isEmpty(title_val) && !TextUtils.isEmpty(desc_val) && mImageUri != null) {

            mProgress.show();
            StorageReference filepath = mStorage.child("Blog_Images").child(mImageUri.getLastPathSegment());

            filepath.putFile(mImageUri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                @Override
                public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                    Uri downloadUrl = taskSnapshot.getDownloadUrl();

                    DatabaseReference newPost = mDatabase.push();
                    newPost.child("title").setValue(title_val);
                    newPost.child("desc").setValue(desc_val);
                    newPost.child("image").setValue(downloadUrl.toString());


                    mProgress.dismiss();
                    startActivity(new Intent(PostActivity.this, MainActivity.class));
                }
            });
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);




        // if(requestCode == GALLERY_REQUEST && resultCode == RESULT_OK){
        if (requestCode == CAMERA_REQUEST_CODE && resultCode == RESULT_OK) {

      /*   mImageUri = data.getData();
            mSelectImage.setImageURI(mImageUri);

            CropImage.activity(mImageUri)
                    .setGuidelines(CropImageView.Guidelines.ON)

                    .start(this);

*/

            Bitmap mImageUri = (Bitmap) data.getExtras().get("data");
            mSelectImage.setImageBitmap(mImageUri);
       }


        if (requestCode == CropImage.CROP_IMAGE_ACTIVITY_REQUEST_CODE) {
            CropImage.ActivityResult result = CropImage.getActivityResult(data);
            if (resultCode == RESULT_OK) {
                Uri resultUri = result.getUri();
                mSelectImage.setImageURI(resultUri);
            } else if (resultCode == CropImage.CROP_IMAGE_ACTIVITY_RESULT_ERROR_CODE) {
                Exception error = result.getError();
            }
        }


    }



}

最佳答案

我找到了我的问题的解决方案，我意识到我可以使用 data.getData() 函数而不是使用 Bitmap 函数来获取我捕获的数据:

 mImageUri = data.getData();
            mSelectImage.setImageURI(mImageUri);

此外，以前我没有意识到我的“裁剪”功能无法工作，因为我缺少:

mImageUri = resultUri;

我意识到有一个问题，如果我不裁剪捕获的图像，fire-base 无法处理高分辨率(或存储大小？加载速度会很慢/图像没有出现)，这可以通过“裁剪”功能解决。

最终代码如下: 感谢大家的帮助。 

package simpleblog2.emily.example.com.simpleblog2;

import android.app.ProgressDialog;
import android.content.Intent;
import android.graphics.Bitmap;
import android.media.Image;
import android.net.Uri;

import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Toast;


import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.storage.FirebaseStorage;

import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.UploadTask;


import com.theartofdev.edmodo.cropper.CropImage;
import com.theartofdev.edmodo.cropper.CropImageView;


public class PostActivity extends AppCompatActivity {

    private ImageButton mSelectImage;
    private EditText mPostTitle;
    private EditText mPostDesc;
    private Button mSubmitBtn;
    private ProgressDialog mProgress;
    private DatabaseReference mDatabase;

    private Uri mImageUri = null;

    private static final  int GALLERY_REQUEST =1;

    private static final int CAMERA_REQUEST_CODE=1;

    private StorageReference mStorage;

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

        mStorage = FirebaseStorage.getInstance().getReference();
        mDatabase = FirebaseDatabase.getInstance().getReference().child("Blog");

        mSelectImage = (ImageButton) findViewById(R.id.imageSelect);
        mPostTitle = (EditText)  findViewById(R.id.titleField);
        mPostDesc = (EditText) findViewById(R.id.descField);
        mSubmitBtn = (Button) findViewById(R.id.submitBtn);

        mProgress = new ProgressDialog(this);

        mSelectImage.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

                if (intent.resolveActivity(getPackageManager()) != null) {
                    startActivityForResult(intent, CAMERA_REQUEST_CODE);
                }
                //startActivityForResult(intent,CAMERA_REQUEST_CODE);


/*
                Intent galleryIntent = new Intent(Intent.ACTION_GET_CONTENT);
                galleryIntent.setType("image/*");
                startActivityForResult(galleryIntent, GALLERY_REQUEST);

                */

            }
        });

        mSubmitBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startPosting();
            }
        });
    }



    private void startPosting(){

        mProgress.setMessage("Posting to blog...");


        final String title_val = mPostTitle.getText().toString().trim();
        final String desc_val = mPostDesc.getText().toString().trim();
        if(!TextUtils.isEmpty(title_val)&&!TextUtils.isEmpty(desc_val) && mImageUri != null){

            mProgress.show();
            StorageReference filepath = mStorage.child("Blog_Images").child(mImageUri.getLastPathSegment());

            filepath.putFile(mImageUri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                @Override
                public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                    Uri downloadUrl =taskSnapshot.getDownloadUrl();

                    DatabaseReference newPost = mDatabase.push();
                    newPost.child("title").setValue(title_val);
                    newPost.child("desc").setValue(desc_val);
                    newPost.child("image").setValue(downloadUrl.toString());


                    mProgress.dismiss();
                    startActivity(new Intent(PostActivity.this,MainActivity.class));
                }
            });
        }
    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
      // if(requestCode == GALLERY_REQUEST && resultCode == RESULT_OK){
       if(requestCode == CAMERA_REQUEST_CODE && resultCode == RESULT_OK){




        mImageUri = data.getData();
            mSelectImage.setImageURI(mImageUri);

            CropImage.activity(mImageUri)
                    .setGuidelines(CropImageView.Guidelines.ON)
                    .setAspectRatio(1,1)
                    .start(this);




        /* Bitmap mImageUri1 = (Bitmap) data.getExtras().get("data");
         mSelectImage.setImageBitmap(mImageUri1);

          Toast.makeText(this, "Image saved to:\n" +
                  data.getExtras().get("data"), Toast.LENGTH_LONG).show();


*/



        }

        if (requestCode == CropImage.CROP_IMAGE_ACTIVITY_REQUEST_CODE) {
            CropImage.ActivityResult result = CropImage.getActivityResult(data);
            if (resultCode == RESULT_OK) {
                Uri resultUri = result.getUri();

                mSelectImage.setImageURI(resultUri);
                mImageUri = resultUri;

            } else if (resultCode == CropImage.CROP_IMAGE_ACTIVITY_RESULT_ERROR_CODE) {
                Exception error = result.getError();
            }
        }


    }




}

关于android - 从相机捕获图像并上传到 Firebase，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41376328/

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