[Firebase] 03 - Cloud Storage: object storage service

 根据db上的聊天信息控制大文件的下载。

Everything is based on Chatting System.

 

• 通过db存放少量图片

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

        if (requestCode == PICK_IMAGE && resultCode == Activity.RESULT_OK) {
            if (data == null) {
                Toast.makeText(context, "Warn: data == null", Toast.LENGTH_LONG).show();
                return;
            }
            try {
                InputStream inputStream = context.getContentResolver().openInputStream(data.getData());

                //////////////////////////////////////////////////////////////////////////////////////////////
                // getContext().getContentResolver()返回的是ContentResolver对象：负责获取ContentProvider提供的数据
                // 通过 ContentResolver 来读取其他应用的信息，最常用的莫过于读取联系人， 多媒体信息等！
                // Ref: [Android] 02 - Four Basic Components and Intent
                //////////////////////////////////////////////////////////////////////////////////////////////

                Bitmap imgBitmap = BitmapFactory.decodeStream(inputStream);
                imgBitmap = ImageUtils.cropToSquare(imgBitmap);

                // 自定义
                InputStream is = ImageUtils.convertBitmapToInputStream(imgBitmap);
                final Bitmap liteImage = ImageUtils.makeImageLite(is,
                        imgBitmap.getWidth(),    imgBitmap.getHeight(),
                        ImageUtils.AVATAR_WIDTH, ImageUtils.AVATAR_HEIGHT);

                // 加密
                String imageBase64 = ImageUtils.encodeBase64(liteImage);
                myAccount.avata    = imageBase64;

                waitingDialog.setCancelable(false)
                        .setTitle("Avatar updating....")
                        .setTopColorRes(R.color.colorPrimary)
                        .show();


　　　　　　　　　　

                userDB.child("avata").setValue(imageBase64)
                        .addOnCompleteListener(new OnCompleteListener<Void>() {
                            @Override
                            public void onComplete(@NonNull Task<Void> task) {
                                if(task.isSuccessful()){

                                    waitingDialog.dismiss();
                                    SharedPreferenceHelper preferenceHelper = SharedPreferenceHelper.getInstance(context);
                                    preferenceHelper.saveUserInfo(myAccount);
                                    avatar.setImageDrawable(ImageUtils.roundedImage(context, liteImage));

                                    new LovelyInfoDialog(context)
                                            .setTopColorRes(R.color.colorPrimary)
                                            .setTitle("Success")
                                            .setMessage("Update avatar successfully!")
                                            .show();
                                }
                            }
                         })
                        .addOnFailureListener(new OnFailureListener() {
                            @Override
                            public void onFailure(@NonNull Exception e) {
                                waitingDialog.dismiss();
                                Log.d("Update Avatar", "failed");
                                new LovelyInfoDialog(context)
                                        .setTopColorRes(R.color.colorAccent)
                                        .setTitle("False")
                                        .setMessage("False to update avatar")
                                        .show();
                            }
                        });
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }
    }

 

• 通过storage存放大量图片

不同的用户，分配一个单独的文件夹，存放图片，音频什么的各种类型的资源。

1. Firebase : Differences between realtime database and file storage

2. Protocal design.

三类聊天信息：

CHAT	TEXT	text	comment
CHAT	VOICE	url	comment
CHAT	IMAGE	url	comment

 

    private void checkFilePermissions() {

        if(Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP){
            int permissionCheck = UploadActivity.this.checkSelfPermission("Manifest.permission.READ_EXTERNAL_STORAGE");
            permissionCheck += UploadActivity.this.checkSelfPermission("Manifest.permission.WRITE_EXTERNAL_STORAGE");
            if (permissionCheck != 0) {
                this.requestPermissions(new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE,android.Manifest.permission.READ_EXTERNAL_STORAGE}, 1001); //Any number
            }
        }else{
            Log.d(TAG, "checkBTPermissions: No need to check permissions. SDK version < LOLLIPOP.");
        }
    }

 

　　private void addFilePaths(){

　　　　Log.d(TAG, "addFilePaths: Adding file paths.");
　　　　String path = System.getenv("EXTERNAL_STORAGE");
　　　　Log.d(TAG, "SD: " + path);　　// "/sdcard"

　　　　pathArray.add(path+"/image1.jpg");
　　　　pathArray.add(path+"/image2.jpg");
　　　　pathArray.add(path+"/image3.jpg");
　　　　loadImageFromStorage();　　// ----> 
　　}

将图片拖入sdcard文件夹中。

    private void loadImageFromStorage()
    {
        try{
            String path = pathArray.get(array_position);
            File f=new File(path, "");
            Bitmap b = BitmapFactory.decodeStream(new FileInputStream(f));
            image.setImageBitmap(b);

        }catch (FileNotFoundException e){
            Log.e(TAG, "loadImageFromStorage: FileNotFoundException: " + e.getMessage() );
        }

    }

 

图片准备就绪，上传到storage相应的文件夹。

上传

设置上传按钮，以及对应的响应事件。

btnUpload.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {
                Log.d(TAG, "onClick: Uploading Image.");
                mProgressDialog.setMessage("Uploading Image...");
                mProgressDialog.show();

　　　　　　　　　 

                //get the signed in user
                FirebaseUser user = auth.getCurrentUser();
                String userID = user.getUid();

                String name = imageName.getText().toString();
                if(!name.equals("")){
                    Uri uri = Uri.fromFile(new File(pathArray.get(array_position)));
                    // ref:android之Uri的常用几个例子

                    StorageReference storageReference = mStorageRef.child("images/users/" + userID + "/" + name + ".jpg");　　// <----
                    storageReference.putFile(uri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                        @Override
                        public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                            // Get a URL to the uploaded content
                            Uri downloadUrl = taskSnapshot.getDownloadUrl();
                            toastMessage("Upload Success");
                            mProgressDialog.dismiss();
                        }
                    }).addOnFailureListener(new OnFailureListener() {
                        @Override
                        public void onFailure(@NonNull Exception e) {
                            toastMessage("Upload Failed");
                            mProgressDialog.dismiss();
                        }
                    })
                    ;
                }
            }
        });

 

下载

 from: how can I download image on firebase storage?

StorageReference storageRef = storage.getReference();
storageRef.child("images/stars.jpg").getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
    @Override
    public void onSuccess(Uri uri) {
        // Got the download URL for 'users/me/profile.png'
    }
}).addOnFailureListener(new OnFailureListener() {
    @Override
    public void onFailure(@NonNull Exception exception) {
        // Handle any errors
    }
});