Question

用户从相机或图库中选择图像，因此现在图像位于Imageview中以向用户显示图片。现在用户将其上传到服务器，但我上传的每张图片都是黑色的。为什么会这样？这是代码：

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

        final StorageReference storageRef = FirebaseStorage.getInstance().getReferenceFromUrl("gs://lalala-14247.appspot.com");

        mImageview.setDrawingCacheEnabled(true);
        mImageview.buildDrawingCache();
        Bitmap bitmap = mImageview .getDrawingCache();

        ByteArrayOutputStream baas = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baas);

        byte[] data = baas.toByteArray();
        String timeStamp = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());

        UploadTask uploadTask = storageRef.child("Photo").child(timeStamp).putBytes(data);

        uploadTask.addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception exception) {
                Toast.makeText(MainActivity.this, "Picture upload failed", Toast.LENGTH_LONG).show();
            }
        }).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
            @Override
            public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                Toast.makeText(MainActivity.this, "Upload done", Toast.LENGTH_LONG).show();

            }
        });

    }

});

我的依赖项：

compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile 'com.squareup.picasso:picasso:2.5.2'
compile 'com.google.firebase:firebase-storage:10.0.1'
compile 'com.google.firebase:firebase-auth:10.0.1'
compile 'com.google.firebase:firebase-database:10.0.1'
testCompile 'junit:junit:4.12'

Answer 1

试试这个，

False

有关详细信息，请查看https://firebase.google.com/docs/storage/android/upload-files

Answer 2

final int backgroundPreviousColor = view.getDrawingCacheBackgroundColor();
view.setDrawingCacheEnabled(true);
view.setDrawingCacheBackgroundColor(0xfffafafa);
final Bitmap bitmap = view.getDrawingCache();
view.setDrawingCacheBackgroundColor(backgroundPreviousColor);
bitmap.compress(Bitmap.CompressFormat.JPEG, 80, stream);
view.setDrawingCacheEnabled(cachePreviousState);

这对我有帮助

上传的图片到Firebase都是黑色的。如何摆脱它？

2 个答案: