如何限制Android中的微調器下拉視圖的高度

Question

請提出任何我用來創建它的方法。

查詢：我創建了2-微調視圖，在這裏我要補充國家/城市名單，所以像如果我選擇印度，然後我得到50項下拉視圖中，問題這是它正在整個頁面的高度。

我想什麼：我想創建一個下拉視圖，在那裏用戶可以看到在 下拉觀止10個項目，其他項目將顯示用戶只要將滾動下拉視圖。

---

Answer 1

您移動彈出可以使用反射。

Spinner spinner = (Spinner) findViewById(R.id.spinner); 
    try { 
     Field popup = Spinner.class.getDeclaredField("mPopup"); 
     popup.setAccessible(true); 

     // Get private mPopup member variable and try cast to ListPopupWindow 
     android.widget.ListPopupWindow popupWindow = (android.widget.ListPopupWindow) popup.get(spinner); 

     // Set popupWindow height to 500px 
     popupWindow.setHeight(500); 
    } 
    catch (NoClassDefFoundError | ClassCastException | NoSuchFieldException | IllegalAccessException e) { 
     // silently fail... 
    } 

Answer 2

爲我創造了我自己的，PopUpWindow通過@theLittleNaruto的建議，在評論部分。

main.xml中

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"> 

    <Button 
     android:layout_marginTop="80dp" 
     android:id="@+id/btn" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Country" 
     android:layout_gravity="center_vertical|center_horizontal"/> 
</LinearLayout> 

popup_example.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:orientation="vertical" 
    android:padding="10dip" > 

    <ListView 
     android:id="@+id/lstview" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     /> 

</LinearLayout> 

showpopup_1.java

package com.example.spinnerworking; 

import android.app.Activity; 
import android.content.Context; 
import android.graphics.Color; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.Gravity; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.ArrayAdapter; 
import android.widget.BaseAdapter; 
import android.widget.Button; 
import android.widget.ImageButton; 
import android.widget.ListView; 
import android.widget.PopupWindow; 
import android.widget.TextView; 
import android.widget.PopupWindow.OnDismissListener; 
import android.widget.Toast; 

public class showpopup_1 extends Activity { 

    boolean click = true ; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 

     setContentView(R.layout.main); 
     final LayoutInflater inflater = (LayoutInflater) this 
       .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     final Button b = (Button) findViewById(R.id.btn); 
     final View pview = inflater.inflate(R.layout.popup_example, 
       (ViewGroup) findViewById(R.layout.main)); 
     final PopupWindow pw = new PopupWindow(pview); 
     Log.i("hello", "hello") ; 

     b.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View v) { 
       if (click) { 
        // if onclick written here, it gives null pointer exception. 
        // if onclick is written here it gives runtime exception. 
        pw.showAtLocation(v, Gravity.CENTER_HORIZONTAL, 0, 0); 
        pw.update(8, 0, 150, 200); 
        String[] array = new String[] { "tushar", "pandey", 
          "almora" }; 

        ListView lst = (ListView) pview.findViewById(R.id.lstview); 
        adapterHello adapter = new adapterHello(showpopup_1.this); 
        lst.setAdapter(adapter); 
        lst.setOnItemClickListener(new OnItemClickListener() { 
         @Override 
         public void onItemClick(AdapterView<?> arg0, View arg1, 
           int arg2, long arg3) { 
          Toast.makeText(showpopup_1.this, "pandey", 
            Toast.LENGTH_SHORT).show(); 
         } 

        }); 
        click = false ; 
       } 
       else 
       { 
        pw.dismiss(); 
        click = true; 
       } 

      } 
     }); 
    } 
} 

class adapterHello extends BaseAdapter { 
    String array[] = new String[] { "tushar", "pandey", "almora", "hello", 
      "tushar", "pandey", "almora", "hello", "tushar", "pandey", 
      "almora", "hello" }; 

    showpopup_1 context; 

    public adapterHello(showpopup_1 context) { 
     this.context = context; 
    } 

    public int getCount() { 
     // TODO Auto-generated method stub 
     return array.length; 
    } 

    @Override 
    public Object getItem(int arg0) { 
     // TODO Auto-generated method stub 
     return arg0; 
    } 

    @Override 
    public long getItemId(int position) { 
     // TODO Auto-generated method stub 
     return position; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     // TODO Auto-generated method stub 
     TextView text = new TextView(context); 
     text.setHeight(30); 
     text.setPadding(10, 8, 0, 0); 
     text.setTextColor(Color.BLACK); 
     text.setText(array[position]); 
     text.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       Log.i("clicked", "tushar"); 
      } 
     }); 
     return text; 
    } 

} 

Answer 3

1. 在適配器

getDropDownView(); 
parentParams = new FrameLayout.LayoutParams(LayoutParams.WRAP_CONTENT, (int) Utils.convertDpToPx(350)); 
parentParams.gravity = Gravity.BOTTOM; 
parent.setLayoutParams(parentParams); 

添加 android:popupBackground="#00000000"到微調

可以通過添加android:dropDownVerticalOffset="60dp"

Answer 4

您也可以影響通過繼承Spinner，並覆蓋其getWindowVisibleDisplayFrame(Rect outRect)這是計算中使用的android.widget.PopupWindow下拉視圖的位置和大小。只需設置outRect即可限制可以顯示下拉視圖的區域。

這種方法當然不適用於所有場景，因爲有時候您想放置下拉視圖，因此它不會遮擋另一個視圖或其他一些僅在「實例外」已知的情況。

在我的情況下，我需要將FLAG_LAYOUT_NO_LIMITS標誌應用於我的活動窗口，這導致outRect變得很大，因此下拉視圖的一部分有時隱藏在導航欄的後面。爲了恢復原來的行爲，我使用了以下覆蓋：

@Override 
public void getWindowVisibleDisplayFrame(Rect outRect) { 
    WindowManager wm = (WindowManager) getContext.getSystemService(Context.WINDOW_SERVICE); 
    Display d = wm.getDefaultDisplay(); 
    d.getRectSize(outRect); 
    outRect.set(outRect.left, <STATUS BAR HEIGHT>, outRect.right, outRect.bottom); 
}