我正在开发一个简单的博客应用，允许用户将照片从电话库和说明上传到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，我能够将我捕获的图像显示在图像按钮中，但是我无法将我的图像发布到firebase服务器（“提交帖子”按钮不会对我的onclick功能做出反应）。
我怀疑我的startPosting（）函数中有一些错误，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();
}
}
}
}
答案 0 :(得分：4)
我找到了一个问题的解决方案，我意识到我可以使用data.getData（）函数获取捕获的数据，而不是使用Bitmap函数：
mImageUri = data.getData();
mSelectImage.setImageURI(mImageUri);
此外，以前我没有意识到我的作物＆＃39;功能无法正常工作，因为我缺少：
mImageUri = resultUri;
我意识到有一个问题，如果我没有裁剪我的捕获图像，火基无法处理高分辨率（或存储大小？它将加载非常慢/图像没有出现），这可以通过“裁剪”解决问题。功能。
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();
}
}
}
}
答案 1 :(得分：0)
如果auth！= null之前，我将其更改为true，所以if将始终评估为true。
private void uploadFile() {
//if there is a file to upload
if (filePath != null) {
//displaying a progress dialog while upload is going on
final ProgressDialog progressDialog = new ProgressDialog(this);
progressDialog.setTitle("Uploading");
progressDialog.show();
StorageReference riversRef = storageReference.child("Blog_Images.jpg");
riversRef.putFile(filePath)
.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
//if the upload is successfull
//and displaying a success toast
Toast.makeText(getApplicationContext(), "File Uploaded ", Toast.LENGTH_LONG).show();
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception exception) {
//if the upload is not successfull
//hiding the progress dialog
progressDialog.dismiss();
//and displaying error message
Toast.makeText(getApplicationContext(), exception.getMessage(), Toast.LENGTH_LONG).show();
}
})
.addOnProgressListener(new OnProgressListener<UploadTask.TaskSnapshot>() {
@Override
public void onProgress(UploadTask.TaskSnapshot taskSnapshot) {
//calculating progress percentage
double progress = (100.0 * taskSnapshot.getBytesTransferred()) / taskSnapshot.getTotalByteCount();
//displaying percentage in progress dialog
progressDialog.setMessage("Uploaded " + ((int) progress) + "%...");
}
});
}
//if there is not any file
else {
//you can display an error toast
}
}
答案 2 :(得分：0)
您的班级字段mImageUri永远不会被初始化。您将接收到的位图放在本地字段中，称为与类字段相同。
Bitmap mImageUri = (Bitmap) data.getExtras().get("data");
mSelectImage.setImageBitmap(mImageUri);
因此，情况永远不会成真。
if (!TextUtils.isEmpty(title_val) && !TextUtils.isEmpty(desc_val) && mImageUri != null)
答案 3 :(得分：0)
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);
}
您的URI有可能null。我想，这就是问题所在。
除非你在其他地方做到这一点？
可能会加载图片，因为requestCode = CAMERA_REQUEST_CODE但不是CropImage.CROP_IMAGE_ACTIVITY_RESULT_ERROR_CODE。
我将在下面发布我曾经做过的代码，但是你需要先了解一些事情。 从Android版本7使用Uri.parseFromFile（文件）返回错误，因为谷歌想限制您的访问权限。从现在开始，如果你想获得文件uri，你应该使用FileProvider
//File provider declaration in manifest.
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="com.hadas.yotam.manchworkers.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/provider_paths"/>
</provider>
//in new xml file define the location you need permmision to, the code below give you permmision for any external file.
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path name="external_files" path="."/>
</paths>
所以现在上传时使用全局Uri变量如果onActivityResault成功，则代码如下：
if(Build.VERSION.SDK_INT>=24) {
String file = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)+"/" + Calendar.getInstance().getTimeInMillis() + ".jpg";
File file1 = new File(file);
photoURI = FileProvider.getUriForFile(this, getApplicationContext().getPackageName() + ".provider", file1);
intent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
}
然后在你的onActivityResult中你检查你的photoURI是否为null，如果它是真的（它为null） 使用photoURI = data.getData（）;
//if phone android version greater or equal to Marshmelo
if(Build.VERSION.SDK_INT>Build.VERSION_CODES.M){
//check if have permmission to write to external + permmision to camera
if(ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE)== PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.CAMERA)== PackageManager.PERMISSION_GRANTED){
//if its have permission then new intent to capture image
intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
//if android version >= 24 (Android Nugget)
if(Build.VERSION.SDK_INT>=24) {
//create new String to pictures directory and set the file name to current_time.jpg
String file = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)+"/" + Calendar.getInstance().getTimeInMillis() + ".jpg";
File file1 = new File(file);
//set GLOBAL variable Uri from the file using FileProvider
photoURI = FileProvider.getUriForFile(this, getApplicationContext().getPackageName() + ".provider", file1);
//add the file location the intent (the picture will be save to this file)
intent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
}
tagIntent = CAPTURE_RESAULT;
//else - dont have permission, request for permission
}else{
requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE,Manifest.permission.CAMERA},CAPTURE_RESAULT);
}
else -
}else{
// same thing only without FileProvider (FileProvider only required since Nugget)
intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
String file = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)+"/" + Calendar.getInstance().getTimeInMillis() + ".jpg";
File file1 = new File(file);
photoURI = Uri.fromFile(file1);
intent.putExtra(MediaStore.EXTRA_OUTPUT,photoURI);
tagIntent = CAPTURE_RESAULT;
}
//if phone can handle the intent, start the intent for resault.
if(intent.resolveActivity(getPackageManager())!=null) {
startActivityForResult(intent,tagIntent);
}