java - 如何使对话框 fragment 背景不可见？

Question

我在 Flow 的方法中使用了 youtuber Coding 来创建自定义对话框。我整天都在尝试使对话框的背景透明。我已经使用了我在网上找到的每一种方法。没有工作。

事情是这样的:

• 首先是对话框布局layout_dialog.xml:

  <RelativeLayout
      xmlns:android="http://schemas.android.com/apk/res/android"
          xmlns:app="http://schemas.android.com/apk/res-auto"
          android:layout_width="match_parent"
          android:layout_height="match_parent" >
  
      <RelativeLayout
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_marginTop="50dp"
          android:background="@drawable/dialog_background">
  
          <!-- The contents of the Dialog go here -->
  
      </RelativeLayout>
  
      <ImageView
          android:id="@+id/iconImageView2"
          android:layout_width="100dp"
          android:layout_height="100dp"
          android:layout_alignParentTop="true"
          android:layout_centerHorizontal="true"
          android:layout_marginTop="0dp"
          android:background="?attr/actionBarItemBackground"
          android:scaleType="fitCenter"
          app:srcCompat="@android:mipmap/sym_def_app_icon" />
  
  </RelativeLayout>
  

• 这是对话框类:

   public class DialogBrightness extends AppCompatDialogFragment {
  
       //declare whatever variables here
  
       @Override
       public Dialog onCreateDialog(Bundle savedInstanceState) {
  
           AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
  
           LayoutInflater inflater = getActivity().getLayoutInflater();
           View view = inflater.inflate(R.layout.layout_dialog, null);
  
           builder.setView(view)
                   .setTitle("Login")
                   .setNegativeButton("cancel", new DialogInterface.OnClickListener() {
                       @Override
                       public void onClick(DialogInterface dialogInterface, int i) {
                       }
                   })
                   .setPositiveButton("ok", new DialogInterface.OnClickListener() {
                       @Override
                       public void onClick(DialogInterface dialogInterface, int i) {
                           //get whatever values
                           listener.apply(//values);
                       }
                   });
  
           //findViewById for your dialog contents here
  
           return builder.create();
       }
  
       public interface DialogBrightnessListener {
           void apply(//values);
       }
   }
  

• 这是从主 Activity 调用的对话框:

  DialogBrightness dialogBrightness = new DialogBrightness();
  dialogBrightness.show(getSupportFragmentManager(), "Brightness Dialog");
  

对话框是这样显示的:

我试图让顶部的白色部分不可见。什么都没用!

Answer 1

试试这个:

将下面的代码放在onCreateDialog中:

    // set the dialog background to transparent
    getDialog().getWindow().setBackgroundDrawable(newColorDrawable(Color.TRANSPARENT));

    // remove background dim 
    getDialog().getWindow().setDimAmount(0);