当从单独的类调用 PopupWindow 方法时，如何从 xml 文件定义 PopupWindow 中的布局

当从单独的类调用 PopupWindow 方法时，我希望能够从 xml 文件定义 PopupWindow 中的布局。下面的代码可以根据需要工作，除了布局是从 java 文件而不是 xml 文件中提取的。我不知道在这种情况下如何正确访问 xml 布局并在 PopupWindow 中实现，或者是否可能。感谢意见和具体建议。谢谢。

showPopup.java

public class showPopup {
Context ctx;
Button btnDismiss;

public showPopup(Context ctx){
    this.ctx = ctx;     
}

public void onCreateView(LayoutInflater layoutInflater, ViewGroup container) {
    View layout = layoutInflater.inflate(R.layout.popup_layout, null);   
    btnDismiss = (Button) layout.findViewById(R.id.btndismissxml);
}

public void goJoe(View parent){ 
    final PopupWindow popup = new PopupWindow(ctx);

    btnDismiss = new Button (ctx);
    btnDismiss.setText("Text is from showPopup.java");

    popup.setContentView(btnDismiss);
    popup.setWidth(400);
    popup.setHeight(580);
    popup.showAtLocation(parent, Gravity.CENTER_HORIZONTAL, 10, 10);        

    btnDismiss.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            popup.dismiss();    
        }
    });
  }
}

Tab3Fragment.java

public class Tab3Fragment extends Fragment implements OnClickListener{
Button btnPopup;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup containerGroup, Bundle savedInstanceState) {    
    View v = inflater.inflate(R.layout.tab3_fragment, containerGroup, false);   
    btnPopup = (Button)v.findViewById(R.id.btnPopupxml);
    btnPopup.setOnClickListener(this);
    return v;
}
//@Override
public void onViewCreated(View v) {
    btnPopup = (Button)v.findViewById(R.id.btnPopupxml);
    btnPopup.setOnClickListener(this);
}
@Override
public void onClick(View parent) {
    new showPopup(getActivity().getApplicationContext()).goJoe(parent); 
  }
}

popup_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content" 
android:layout_height="fill_parent"
android:id="@+id/layout">

<Button android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_width="wrap_content" 
    android:id="@+id/btndismissxml"
    android:text="Text is from popup_layout.xml"></Button>
</RelativeLayout>

更新（1835 年，12 月 11 日）：这是一个草稿弹出窗口。应用程序中将有几个服务用户可编辑的下拉字段。

Change showPopup像这样

public class showPopup {
Context ctx;
Button btnDismiss, btnSaveRecord, btnLastRecord;
EditText edSpeciesLookup,edSpeciesLookupRowid;
DBAdapter msdb;
SQLiteDatabase db;

public showPopup(Context ctx){
    this.ctx = ctx; 
    msdb = new DBAdapter(ctx,"gfda", null);     
    db = msdb.getWritableDatabase();
}

public void goJoe(View parent){ 
    LayoutInflater inflater = (LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View popUpView = inflater.inflate(R.layout.popup_layout, null, false);
    final PopupWindow popup = new PopupWindow(popUpView, 400,
                    580, true);         
    popup.setContentView(popUpView);
    btnDismiss = (Button) popUpView.
                    findViewById(R.id.btndismissxml);
    edSpeciesLookup = (EditText) popUpView.
                    findViewById(R.id.editspecieslookupxml);
    edSpeciesLookupRowid = (EditText) popUpView.
                    findViewById(R.id.editspecieslookuprowidxml);
    popup.showAtLocation(parent, Gravity.CENTER_HORIZONTAL, 10, 10);        

    btnDismiss.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            popup.dismiss();    
        }
    });

    btnSaveRecord = (Button) popUpView.findViewById(R.id.btnSaveRecordxml);
    btnSaveRecord.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {//SAVE
            String szSpecies = edSpeciesLookup.getText().toString();
        if(szSpecies.matches("")){//checks to see if species field is empty...
            ///nothing happens...
        }else{db.execSQL("INSERT INTO speciesLookupDb (species) VALUES ('"+szSpecies+"')");
            resetForm();
        }
    }
    });

    btnLastRecord=(Button)popUpView.findViewById(R.id.btnLastRecordxml);
    btnLastRecord.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Cursor c = db.rawQuery("SELECT * FROM speciesLookupDb WHERE _id = (SELECT MAX(_id) FROM speciesLookupDb)",null);
            if (c.moveToFirst()){////a record exists (table is not blank)           
                edSpeciesLookupRowid.setText(c.getString(0));
                edSpeciesLookup.setText(c.getString(1));            
            }else{//no record here...table is blank.        
            }
        }
    });
  }
}

如果你想解雇popup触摸屏幕上的任何位置时，您必须在之后添加这些行setContentView弹出窗口和之前showAtLocation

Bitmap bitmap = BitmapFactory.decodeResource(getResources(),
                    R.drawable.any_drawable);
popup.setBackgroundDrawable(new BitmapDrawable(getResources(),
                    bitmap));
popup.setOutsideTouchable(true);
popup.setFocusable(true);