如何使用android將照片從相機發布到Firebase數據庫

Question

我正在開發一個應用程序，我將拍照並將其張貼到我的Firebase數據庫以及一些說明。我寫了一些代碼，但是當我拍照並點擊確定按鈕時，應用程序崩潰。

下面是我的代碼：

的錯誤是view crush error

package com.example.user.potholereportingapp; 

import android.app.ProgressDialog; 
import android.content.Intent; 
import android.graphics.Bitmap; 
import android.graphics.drawable.Drawable; 
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.ImageView; 
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; 

import java.io.ByteArrayOutputStream; 
import java.io.File; 
import java.util.Date; 

import static android.app.Activity.RESULT_OK; 
import static android.app.Activity.RESULT_OK; 
import static android.app.Activity.RESULT_OK; 
import static android.app.Activity.RESULT_OK; 
import static android.app.Activity.RESULT_OK; 
import static android.app.Activity.RESULT_OK; 

public class PostActivity extends AppCompatActivity { 
    private ImageButton mSelectImage; 
    private EditText mPostTitle; 
    private EditText mPostDesc; 
    private Button mSubmitBtn; 
    private Uri photo=null; 
    private StorageReference mStorage; 
    private DatabaseReference mDatabase; 
    private ProgressDialog mProgress; 
    static final int CAM_REQUEST=1; 

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

     mStorage= FirebaseStorage.getInstance().getReference(); 
     mDatabase= FirebaseDatabase.getInstance().getReference().child("Blog"); 
     mProgress=new ProgressDialog(this); 

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

     mSubmitBtn=(Button)findViewById(R.id.submitBtn); 

     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, CAM_REQUEST); 
       } 
      } 
     }); 

     mSubmitBtn.setOnClickListener(new View.OnClickListener(){ 

      @Override 
      public void onClick(View view) { 
       startPosting(); 
      } 
     }); 

    } 

    private void startPosting() { 

     mProgress.setMessage("Posting Image..."); 
     mProgress.show(); 

     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) && photo != null){ 

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

      filepath.putFile(photo).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==CAM_REQUEST && resultCode==RESULT_OK) { 

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

      CropImage.activity(photo) 
        .setGuidelines(CropImageView.Guidelines.ON) 
        .setAspectRatio(1, 1) 
        .start(this); 
     } 
     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); 
       photo= resultUri; 

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

     } 
    } 
} 

Answer 1

我研究關於我有問題，我來看看我怎麼能做到這一點。 1.首先，我決定將我的照片保存在我的外部文件中。 2.第二，我從外部文件上傳照片到firebase數據庫。

下面是我的代碼：

package com.example.user.potholereportingapp; 

import android.app.ProgressDialog; 
import android.content.Intent; 
import android.graphics.drawable.Drawable; 
import android.net.Uri; 
import android.os.Bundle; 
import android.provider.MediaStore; 
import android.support.annotation.NonNull; 
import android.support.v7.app.AppCompatActivity; 
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.OnFailureListener; 
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 java.io.File; 
import java.util.Date; 

public class PostActivity extends AppCompatActivity { 
    private ImageButton mSelectImage; 
    private EditText mPostTitle; 
    private EditText mPostDesc; 
    private Button mSubmitBtn; 
    private String file=null; 
    private StorageReference mStorage; 
    private DatabaseReference mDatabase; 
    private ProgressDialog mProgress; 
    static final int CAM_REQUEST=1; 

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

     mStorage= FirebaseStorage.getInstance().getReference(); 
     mDatabase= FirebaseDatabase.getInstance().getReference().child("Blog"); 
     mProgress=new ProgressDialog(this); 

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

     mSubmitBtn=(Button)findViewById(R.id.submitBtn); 

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

       Intent camera_intent=new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
       File file=getFile(); 
       camera_intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file)); 
       startActivityForResult(camera_intent,CAM_REQUEST); 
      } 
     }); 

     mSubmitBtn.setOnClickListener(new View.OnClickListener(){ 

      @Override 
      public void onClick(View view) { 
       startPosting(); 
      } 
     }); 

    } 
    private File getFile(){ 
     File folder=new File("sdcard/camera_app"); 

     if(!folder.exists()){ 
      folder.mkdir(); 
     } 
     File image_file=new File(folder,"cam_image.jpg"); 
     return image_file; 
    } 

    private void startPosting() { 

     mProgress.setMessage("Posting Image..."); 
     mProgress.show(); 

     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) && file != null){ 

      mProgress.show(); 
      StorageReference filepath = FirebaseStorage.getInstance().getReference("images"); 

      Uri file = Uri.fromFile(new File("sdcard/camera_app/")); 
      StorageReference riversRef = filepath.child("file"+new Date().getTime()); 
      UploadTask uploadTask = riversRef.putFile(file); 
      uploadTask.addOnFailureListener(new OnFailureListener() { 
       @Override 
       public void onFailure(@NonNull Exception exception) { 
        // Handle unsuccessful uploads 
        Toast.makeText(getApplicationContext(),"Sending failed", Toast.LENGTH_SHORT).show(); 
       } 
      }).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(); 
        Toast.makeText(PostActivity.this,"Uploading Finished...",Toast.LENGTH_LONG).show(); 
        startActivity(new Intent(PostActivity.this,MainActivity.class)); 
       } 
      }); 
     } 
    } 


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

      file="sdcard/camera_app/"; 
      mSelectImage.setImageDrawable(Drawable.createFromPath(file)); 





     } 
    } 
}