Android 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，只是布局是从java文件而不是xml文件中提取的。在这种情况下，我不知道如何正确访问xml布局并在PopupWindow中实现，或者这是否可行。感谢您的建议和具体建议。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();    
        }
    });
  }
}

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); 
  }
}

Tab3Fragment.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();    
        }
    });
  }
}

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（1835111年12月）： 这是一个草稿弹出窗口。在应用程序中，将有几个服务用户可编辑的下拉字段

您可以尝试使用

从API文档中，显示对话框窗口的片段，浮动在其活动窗口的顶部。该片段包含一个对话框对象，它根据片段的状态适当地显示该对话框对象。对话框的控制（决定何时显示、隐藏、关闭）应该通过此处的API完成，而不是直接调用对话框

实现应该重写这个类并实现onCreateView（LayoutFlater、ViewGroup、Bundle）来提供对话框的内容。或者，他们可以覆盖onCreateDialog（Bundle）以创建一个完全自定义的对话框，例如一个AlertDialog，它有自己的内容

1.创建自定义弹出式布局

2.创建自定义对话框片段

3.创建按钮点击界面

4.根据你的片段调用它

1.创建自定义弹出式布局。

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<TextView
    android:id="@+id/app_title"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="14dp"
    android:text="TITLE"
    android:textAppearance="?android:attr/textAppearanceMedium" />

<TextView
    android:id="@+id/popupMsg"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignStart="@+id/app_title"
    android:layout_below="@+id/app_title"
    android:layout_marginTop="30dp"
    android:text="Content" />

<Button
    android:id="@+id/navBtn"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/popupMsg"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="22dp"
    android:text="OK" />

 </RelativeLayout>

import android.app.Dialog;

import android.app.DialogFragment;

.....

public class CustomAlert extends DialogFragment {

public OnSubmitListener mListener;
Context context;
String Title = "";
String content = "";

public CustomAlert (Context context, String title, String message) {
    this.context = context;
    this.Title = title;
    this.content = message;

  }

  @Override
  public Dialog onCreateDialog(Bundle savedInstanceState) {
    final Dialog dialog = new Dialog(getActivity());
    dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
    dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    dialog.setContentView(R.layout.popup_layout);
    Window window = dialog.getWindow();
    window.setLayout(ViewGroup.LayoutParams.MATCH_PARENT,
            ViewGroup.LayoutParams.WRAP_CONTENT);
    dialog.getWindow().setBackgroundDrawable(
            new ColorDrawable(Color.TRANSPARENT));
    dialog.show();
    TextView title = (TextView) dialog.findViewById(R.id.app_title);
    TextView msg = (TextView) dialog.findViewById(R.id.popupMsg);
    Button btn = (Button) dialog.findViewById(R.id.navBtn);
    title.setText(Title);
    msg.setText(content);
    btn.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            mListener.setOnAlert(content);
            dismiss();
        }
    });
    return dialog;
  }
  }

public interface OnSubmitListener{

  void setOnAlert(String arg);

 }

  public class Tab3Fragment extends Fragment implements OnClickListener, OnSubmitListener{
  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);

     return v;
   }
    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        btnPopup.setOnClickListener(getActivity());
  }
   @Override
   public void onClick(View v) {
    ShowDialog("Title", "Sample content");
   }


  private void ShowDialog(String title, String msg) {
    CustomAlert fragment1 = new CustomAlert (
            getActivity(), title, msg);
    fragment1.mListener = this;
    fragment1.show(getFragmentManager(), "");
  }

    @Override
    public void setOnAlert(String arg) {
        Toast.makeText(getActivity(),
                "Button Clicked:"+arg,
                Toast.LENGTH_LONG).show();
    }

}

3.为按钮单击创建界面。

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<TextView
    android:id="@+id/app_title"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="14dp"
    android:text="TITLE"
    android:textAppearance="?android:attr/textAppearanceMedium" />

<TextView
    android:id="@+id/popupMsg"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignStart="@+id/app_title"
    android:layout_below="@+id/app_title"
    android:layout_marginTop="30dp"
    android:text="Content" />

<Button
    android:id="@+id/navBtn"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/popupMsg"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="22dp"
    android:text="OK" />

 </RelativeLayout>

import android.app.Dialog;

import android.app.DialogFragment;

.....

public class CustomAlert extends DialogFragment {

public OnSubmitListener mListener;
Context context;
String Title = "";
String content = "";

public CustomAlert (Context context, String title, String message) {
    this.context = context;
    this.Title = title;
    this.content = message;

  }

  @Override
  public Dialog onCreateDialog(Bundle savedInstanceState) {
    final Dialog dialog = new Dialog(getActivity());
    dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
    dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    dialog.setContentView(R.layout.popup_layout);
    Window window = dialog.getWindow();
    window.setLayout(ViewGroup.LayoutParams.MATCH_PARENT,
            ViewGroup.LayoutParams.WRAP_CONTENT);
    dialog.getWindow().setBackgroundDrawable(
            new ColorDrawable(Color.TRANSPARENT));
    dialog.show();
    TextView title = (TextView) dialog.findViewById(R.id.app_title);
    TextView msg = (TextView) dialog.findViewById(R.id.popupMsg);
    Button btn = (Button) dialog.findViewById(R.id.navBtn);
    title.setText(Title);
    msg.setText(content);
    btn.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            mListener.setOnAlert(content);
            dismiss();
        }
    });
    return dialog;
  }
  }

public interface OnSubmitListener{

  void setOnAlert(String arg);

 }

  public class Tab3Fragment extends Fragment implements OnClickListener, OnSubmitListener{
  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);

     return v;
   }
    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        btnPopup.setOnClickListener(getActivity());
  }
   @Override
   public void onClick(View v) {
    ShowDialog("Title", "Sample content");
   }


  private void ShowDialog(String title, String msg) {
    CustomAlert fragment1 = new CustomAlert (
            getActivity(), title, msg);
    fragment1.mListener = this;
    fragment1.show(getFragmentManager(), "");
  }

    @Override
    public void setOnAlert(String arg) {
        Toast.makeText(getActivity(),
                "Button Clicked:"+arg,
                Toast.LENGTH_LONG).show();
    }

}

4.在片段上实现它。

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<TextView
    android:id="@+id/app_title"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="14dp"
    android:text="TITLE"
    android:textAppearance="?android:attr/textAppearanceMedium" />

<TextView
    android:id="@+id/popupMsg"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignStart="@+id/app_title"
    android:layout_below="@+id/app_title"
    android:layout_marginTop="30dp"
    android:text="Content" />

<Button
    android:id="@+id/navBtn"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/popupMsg"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="22dp"
    android:text="OK" />

 </RelativeLayout>

import android.app.Dialog;

import android.app.DialogFragment;

.....

public class CustomAlert extends DialogFragment {

public OnSubmitListener mListener;
Context context;
String Title = "";
String content = "";

public CustomAlert (Context context, String title, String message) {
    this.context = context;
    this.Title = title;
    this.content = message;

  }

  @Override
  public Dialog onCreateDialog(Bundle savedInstanceState) {
    final Dialog dialog = new Dialog(getActivity());
    dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
    dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    dialog.setContentView(R.layout.popup_layout);
    Window window = dialog.getWindow();
    window.setLayout(ViewGroup.LayoutParams.MATCH_PARENT,
            ViewGroup.LayoutParams.WRAP_CONTENT);
    dialog.getWindow().setBackgroundDrawable(
            new ColorDrawable(Color.TRANSPARENT));
    dialog.show();
    TextView title = (TextView) dialog.findViewById(R.id.app_title);
    TextView msg = (TextView) dialog.findViewById(R.id.popupMsg);
    Button btn = (Button) dialog.findViewById(R.id.navBtn);
    title.setText(Title);
    msg.setText(content);
    btn.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            mListener.setOnAlert(content);
            dismiss();
        }
    });
    return dialog;
  }
  }

public interface OnSubmitListener{

  void setOnAlert(String arg);

 }

  public class Tab3Fragment extends Fragment implements OnClickListener, OnSubmitListener{
  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);

     return v;
   }
    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        btnPopup.setOnClickListener(getActivity());
  }
   @Override
   public void onClick(View v) {
    ShowDialog("Title", "Sample content");
   }


  private void ShowDialog(String title, String msg) {
    CustomAlert fragment1 = new CustomAlert (
            getActivity(), title, msg);
    fragment1.mListener = this;
    fragment1.show(getFragmentManager(), "");
  }

    @Override
    public void setOnAlert(String arg) {
        Toast.makeText(getActivity(),
                "Button Clicked:"+arg,
                Toast.LENGTH_LONG).show();
    }

}

---

5.快乐编码….

更改

showPopup

如下

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<TextView
    android:id="@+id/app_title"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="14dp"
    android:text="TITLE"
    android:textAppearance="?android:attr/textAppearanceMedium" />

<TextView
    android:id="@+id/popupMsg"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignStart="@+id/app_title"
    android:layout_below="@+id/app_title"
    android:layout_marginTop="30dp"
    android:text="Content" />

<Button
    android:id="@+id/navBtn"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/popupMsg"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="22dp"
    android:text="OK" />

 </RelativeLayout>

import android.app.Dialog;

import android.app.DialogFragment;

.....

public class CustomAlert extends DialogFragment {

public OnSubmitListener mListener;
Context context;
String Title = "";
String content = "";

public CustomAlert (Context context, String title, String message) {
    this.context = context;
    this.Title = title;
    this.content = message;

  }

  @Override
  public Dialog onCreateDialog(Bundle savedInstanceState) {
    final Dialog dialog = new Dialog(getActivity());
    dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
    dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    dialog.setContentView(R.layout.popup_layout);
    Window window = dialog.getWindow();
    window.setLayout(ViewGroup.LayoutParams.MATCH_PARENT,
            ViewGroup.LayoutParams.WRAP_CONTENT);
    dialog.getWindow().setBackgroundDrawable(
            new ColorDrawable(Color.TRANSPARENT));
    dialog.show();
    TextView title = (TextView) dialog.findViewById(R.id.app_title);
    TextView msg = (TextView) dialog.findViewById(R.id.popupMsg);
    Button btn = (Button) dialog.findViewById(R.id.navBtn);
    title.setText(Title);
    msg.setText(content);
    btn.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            mListener.setOnAlert(content);
            dismiss();
        }
    });
    return dialog;
  }
  }

public interface OnSubmitListener{

  void setOnAlert(String arg);

 }

  public class Tab3Fragment extends Fragment implements OnClickListener, OnSubmitListener{
  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);

     return v;
   }
    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        btnPopup.setOnClickListener(getActivity());
  }
   @Override
   public void onClick(View v) {
    ShowDialog("Title", "Sample content");
   }


  private void ShowDialog(String title, String msg) {
    CustomAlert fragment1 = new CustomAlert (
            getActivity(), title, msg);
    fragment1.mListener = this;
    fragment1.show(getFragmentManager(), "");
  }

    @Override
    public void setOnAlert(String arg) {
        Toast.makeText(getActivity(),
                "Button Clicked:"+arg,
                Toast.LENGTH_LONG).show();
    }

}

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.        
            }
        }
    });
  }
}

如果您想在触摸屏幕中的任何位置时关闭

弹出窗口

，则必须在弹出窗口的

设置内容视图

之后和

显示位置

之前添加这些行

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

---

美好的这正是我一直在寻找的解决方案。谢谢。你还没有初始化那些

EditText

，这就是为什么让NPE检查编辑并用正确的ID替换那些ID。你必须初始化你想在Java代码中使用的所有字段，否则你会得到NPE。让我们…@NNE你有兴趣回答另一个问题吗？感谢Silambarasan的周到回答。我对对话框的印象是，它们是相当结构化的，可能无法作为小型数据库浏览器使用，这正是我的意图。我在问题的底部添加了一个草稿弹出窗口的屏幕截图。再次感谢您的时间和回答。顺致敬意，