ANDROID：ALIGN動態創建多個選擇器

Question

我創建一個警告對話框有兩個號碼採摘和每個人的前兩名textviews選擇月份和年份，以及textviews只是標籤。 我動態創建它們，因爲它似乎更容易，以填補最小和最大選項（不能使用XML和佈局充氣做）。我不能讓這兩個選擇器（及其標籤）集中在警報對話框中。他們表現在極左和極右，使其非常醜陋。 我可能在編碼這一點，但在這裏它是：

final NumberPicker np1= new NumberPicker(this); 
    final NumberPicker np2= new NumberPicker(this); 
    final TextView t1=new TextView(this); 
    final TextView t2=new TextView(this); 

      t1.setText("Month"); 
    t1.setTextSize(20); 

    t2.setText("Year"); 
    t2.setTextSize(20); 
      np1.setMaxValue(12); 
    np1.setMinValue(1); 
    np2.setMaxValue(2030); 
    np2.setMinValue(2000);  
    np1.setValue(Month); 
    np2.setValue(Year); 

    RelativeLayout linearLayout = new RelativeLayout(this); 
    RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(20,20); 
    RelativeLayout.LayoutParams numPicerParams1=new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,RelativeLayout.LayoutParams.WRAP_CONTENT); 
    RelativeLayout.LayoutParams numPicerParams2=new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,RelativeLayout.LayoutParams.WRAP_CONTENT); 
    numPicerParams1.addRule(RelativeLayout.LEFT_OF); 
    numPicerParams2.addRule(RelativeLayout.ALIGN_PARENT_RIGHT); 

    linearLayout.setLayoutParams(params); 
    linearLayout.addView(np1, numPicerParams1); 
    linearLayout.addView(np2, numPicerParams2); 
    linearLayout.addView(t1,numPicerParams1); 
    linearLayout.addView(t2,numPicerParams2); 

    AlertDialog.Builder builder = new AlertDialog.Builder(this); 
    builder.setTitle("Chose month and year."); 
    builder.setView(linearLayout); 
    builder.setPositiveButton("OK",new DialogInterface.OnClickListener() 
    { (...) 

Answer 1

試試這個：

RelativeLayout relativeLayout = new RelativeLayout(this); 
relativeLayout.addRule(RelativeLayout.CENTER_IN_PARENT); 


RelativeLayout linearLayout = new RelativeLayout(this); 
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(20,20); 
RelativeLayout.LayoutParams numPicerParams1=new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,RelativeLayout.LayoutParams.WRAP_CONTENT); 
RelativeLayout.LayoutParams numPicerParams2=new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,RelativeLayout.LayoutParams.WRAP_CONTENT); 
numPicerParams1.addRule(RelativeLayout.LEFT_OF); 
numPicerParams2.addRule(RelativeLayout.ALIGN_PARENT_RIGHT); 

linearLayout.setLayoutParams(params); 
linearLayout.addView(np1, numPicerParams1); 
linearLayout.addView(np2, numPicerParams2); 
linearLayout.addView(t1,numPicerParams1); 
linearLayout.addView(t2,numPicerParams2); 

relativeLayout.addView(linearLayout); 

Answer 2

你的XML應該是這個樣子：

<RelativeLayout 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_centerInParent="true"> 
    <TextView 
     android:id="@+id/month_text" 
     android:text="Month" 
     android:layout_width="wrap_content" 
     android:layout_alignLeft="@id/month_picker" 
     android:layout_alignRight="@id/month_picker" 
     android:layout_height="wrap_content" 
     android:gravity="center_horizontal"/> 


    <TextView 
     android:id="@+id/day_text" 
     android:text="Year" android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_toRightOf="@id/month_text" 
     android:layout_alignLeft="@id/year_picker" 
     android:layout_alignRight="@id/year_picker" 
     android:gravity="center_horizontal"/> 

    <NumberPicker 
     android:id="@+id/month_picker" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_below="@id/month_text" /> 

    <NumberPicker 
     android:id="@+id/year_picker" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_below="@id/day_text" 
     android:layout_toRightOf="@id/month_picker"/> 

</RelativeLayout> 

這將大大父裏面佈局是您的警報對話框的主體。

然後，在代碼中，你可以這樣做：

NumberPicker monthPicker = (NumberPicker) view.findViewById(R.id.month_picker); 
NumberPicker yearPicker = (NumberPicker) view.findViewById(R.id.year_picker); 

monthPicker.setMaxValue(12); 
monthPicker.setMinValue(1); 
yearPicker.setMaxValue(2030); 
yearPicker.setMinValue(2000);