我正在尝试从Firebase数据库中获取图像以在Activity中显示在我的应用中。图像成功上传,但是当我尝试查看它们时,我看不到它们。这是我从firebase中检索它们的代码。 android studio。
public class ActionBar22 extends AppCompatActivity {
private RecyclerView mrecyclerview;
private ImageAdapter madapter;
private ProgressDialog mprogresscircle;
private DatabaseReference mdatabaseref;
private List<UploadedPosts> muploads;
List<UploadedPosts> list = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_action_bar22);
//pull items from firebase database
mrecyclerview = findViewById(R.id.recycler_view);
mrecyclerview.setHasFixedSize(true);
mrecyclerview.setLayoutManager(new LinearLayoutManager(this));
mprogresscircle = findViewById(R.id.progress_circle);
mprogresscircle = new ProgressDialog(ActionBar22.this);
mprogresscircle.setMessage("Loading...");
mprogresscircle.show();
muploads = new ArrayList<>();
final FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference ref = database.getReference("Uploads");
for(DataSnapshot postsnapshot : dataSnapshot.getChildren()){
UploadedPosts upload=postsnapshot.getValue(UploadedPosts.class);
muploads.add(upload);
}
madapter = new ImageAdapter(ActionBar22.this,muploads);
mrecyclerview.setAdapter(madapter);
mprogresscircle.setVisibility(View.INVISIBLE);
}
@Override
public void onCancelled(DatabaseError databaseError) {
Toast.makeText(ActionBar22.this, databaseError.getMessage(),Toast.LENGTH_LONG).show();
mprogresscircle.dismiss();
mprogresscircle.setVisibility(View.INVISIBLE);
}
});
}
}
我希望它在屏幕的宽度上显示一张照片,它们以一列显示。这些照片不显示。仅空白屏幕。enter image description here
答案 0 :(得分:0)
使用Glide或Picasso在ImageViews中显示图片,这是如何实现的示例:
成绩:
dependencies {
compile 'com.github.bumptech.glide:glide:3.5.2'
compile 'com.android.support:support-v4:22.0.0'
}
代码:
Glide
.with(context)
.load(yourImageURLHere)
.apply(RequestOptions.signatureOf(new CenterCrop()))
.into(ImageView);
,在这里您可以找到其他示例:https://github.com/bumptech/glide,向下滚动页面并进行检查。