添加行到表的佈局錯誤

Question

我創建一個TableLayout和程序添加視圖。當我加入TextView和圖像，它正在properly.When我嘗試添加RadioGroup與RadioButtons它顯示錯誤。

在我的XML佈局我已經在滾動視圖tablelayout以下是我的Java代碼：

import java.util.ArrayList; 
import android.app.Activity; 
import android.app.ListActivity; 
import android.graphics.Typeface; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.ArrayAdapter; 
import android.widget.Button; 
import android.widget.ImageView; 
import android.widget.LinearLayout; 
import android.widget.ListView; 
import android.widget.RadioButton; 
import android.widget.RadioGroup; 
import android.widget.TableLayout; 
import android.widget.TextView; 
import android.widget.TableRow.LayoutParams; 
public class DamnitActivity extends Activity { 
TableLayout makeit; 
ArrayList list_name; 
int color_blue = -16776961; 
int color_gray = -7829368; 
int color_black = -16777216; 
int color_white = -1; 

final int CHECK_BUTTON_ID = 982301; 
int ids_check[]; 
boolean bool_check[]; 

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    makeit = (TableLayout) findViewById(R.id.tableLayout1); 
    list_name = new ArrayList(); 

    list_name.add("Close"); 
    list_name.add("Cristiano"); 
    list_name.add("David"); 
    list_name.add("Fernando"); 
    list_name.add("Messi"); 
    list_name.add("Kaka"); 
    list_name.add("Wayne"); 
    list_name.add("ghse"); 
    list_name.add("gouse"); 
    list_name.add("ghuse"); 
    list_name.add("ghous"); 
    list_name.add("ouse"); 
    list_name.add("use"); 
    list_name.add("e"); 
    list_name.add("eff"); 
    list_name.add("euyr"); 
    list_name.add("ejjyytuty"); 
    list_name.add("madre"); 
    list_name.add("yuir"); 
    list_name.add("eyrty"); 
    list_name.add("etytr"); 
    list_name.add("ewrrtt"); 
    bool_check = new boolean[list_name.size()]; 
    ids_check = new int[list_name.size()]; 
    createTableRows(); 

    } 

public void onListItemClick(ListView parent, View v, int position, long id){ 

    } 

    public void createTableRows() 
    { 
    for (int i = 0; i < list_name.size(); i++) 
    { 

    TextView tv_name = new TextView(this); 
    Button btn_check = new Button(this); 
    ImageView img_line = new ImageView(this); 
    RadioGroup mgroup=new RadioGroup(this); 
    RadioButton newRadioButton = new RadioButton(this); 
    newRadioButton.setText("hi"); 

    LinearLayout.LayoutParams layoutParams = new RadioGroup.LayoutParams(
      RadioGroup.LayoutParams.WRAP_CONTENT, 
      RadioGroup.LayoutParams.WRAP_CONTENT); 
    mgroup.addView(newRadioButton, 0, layoutParams); 



    tv_name.setText((CharSequence) list_name.get(i)); 
    tv_name.setTextColor(color_blue); 
    tv_name.setTextSize(30); 
    tv_name.setTypeface(Typeface.DEFAULT_BOLD); 
    tv_name.setWidth(150); 

    btn_check.setLayoutParams(new LayoutParams(30, 30)); 
    btn_check.setBackgroundResource(R.drawable.small_checkbox_unchecked); 

    img_line.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, 2)); 
    img_line.setBackgroundResource(R.drawable.separater_line); 

    makeit.addView(tv_name); 
    makeit.addView(btn_check); 
    makeit.addView(mgroup); 


    int id = i + CHECK_BUTTON_ID; 
    btn_check.setId(id); 
    ids_check[i] = id; 

    btn_check.setOnClickListener(new OnClickListener() 
    { 
    @Override 
    public void onClick(View v) 
    { 
    // TODO Auto-generated method stub 
    for (int j = 0; j < ids_check.length; j++) 
    { 
    Button btn_check_1 = (Button) findViewById(ids_check[j]); 
    if(v.getId() == ids_check[j]) 
    if(bool_check[j]) 
    { 
    btn_check_1.setBackgroundResource(R.drawable.small_checkbox_unchecked); 
    bool_check[j] = false; 
    } 
    else 
    { 
    btn_check_1.setBackgroundResource(R.drawable.small_checkbox_checked); 
    bool_check[j] = true; 
    } 
    } 
    } 
    }); 

    } 
    } 
    } 

和錯誤是：

11月2日至10日：40：24.120：E/AndroidRuntime （995）：了java.lang.RuntimeException：無法啓動活動ComponentInfo {com.pace.damnit/com.pace.damnit.DamnitActivity}：顯示java.lang.NullPointerException

Answer 1

最有可能makeit TableLayout對象爲null