Question

我在铺设吐司时没什么问题。我有四项活动，其中三项活动不应开放，直至第四项活动设置未完成。

在主要活动中，我有四个文字点击这些我想要得到那个活动但在此之前我正在检查设置表..这是在第四个活动..第一个完成设置然后只有你去其他活动。这就是为什么我要显示吐司请完成设置First.Below代码检查是设置表是空的。但是第一次点击text1消息不显示。但是当我去第四个活动然后回到main然后它显示toast.If任何人问题那么请让我知道

text1.setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View arg0)
            { // TODO Auto-generated method stub

                   try
                   {

                    NewNewDataHelper db=new NewNewDataHelper(this);
                    List<String> list=db.CheckSettingData();
                    if(db.CheckSettingData().isEmpty())
                    {                       
                        showCustomSelectState();

                    }else
                    {
                        Intent i =new Intent(MainActivity.this,Log_Practice_timeActivity.class);
                        i.putExtra("s11","Log");
                        startActivity(i);
                     }              
                   }catch(Exception e)
                   {
                   }
            }
        });




text4.setOnClickListener(new OnClickListener()
        {

            @Override
            public void onClick(View arg0) 
            {
                // TODO Auto-generated method stub

                Intent i =new Intent(MainActivity.this,SettingActivity.class);
                startActivity(i);   

            }
        });

Toast Message方法：

 public void showCustomSelectState() 
{ 
   msg="Please Complete Setting First"; 
   LayoutInflater inflater = getLayoutInflater(); 

  //Inflate the Layout 

   View layout = inflater.inflate(R.layout.my_custom_toast1 (ViewGroup)findViewById(R.id.custom_toast_layout)); 

  TextView text = (TextView) layout.findViewById(R.id.textToShow);

 // Set the Text to show in

 TextView text.setText(msg); 

 Toast toast = new Toast(MainActivity.this); 

 toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
 toast.setDuration(Toast.LENGTH_LONG); 
 toast.setView(layout);
 toast.show(); 
}

  My DataHelper Class And In this CheckSettingData Method is available
   >        public class NewNewDataHelper
         {         
              private Context context;
          private SQLiteDatabase db;
          NewNewOpenHelper myDbHelper;
    // Constructor to accept class instance in on click method.
       public NewNewDataHelper(OnClickListener onClickListener)
      {
    // TODO Auto-generated constructor stub
      this.context=context;
       myDbHelper = new NewNewOpenHelper(this.context);
    try 
    {
        myDbHelper.createDataBase();
    } 
    catch (IOException ioe) 
    {
        ioe.printStackTrace();}  
      }
  }      
 public List<String>CheckSettingData()
{
    this.db=myDbHelper.getDatabase();
    String strValue=null;
    String strValue1=null;
    String strValue2=null;
    String strValue3=null;
    Cursor c=null;
    ArrayList<String> ar=new ArrayList<String>();
    //Log.w("NewNewDataHelper", "param "+param);
    c=db.rawQuery("SELECT * from tb_settings",null);
    //Log.w("NewNewDataHelper", "c= "+c);
    if(c!=null)
    {
        //Log.w("NewNewDataHelper", "Inside IF");
        if(c.moveToFirst())
        {

            do
            {
    strValue=c.getString(c.getColumnIndex("state"));
    strValue1=c.getString(c.getColumnIndex  ("email_id"));    
    strValue2=c.getString(c.getColumnIndex("active_flag"));
    strValue3=c.getString(c.getColumnIndex("create_date")); 
    String str=strValue+"~"+strValue1+"~"+strValue3+"~"+strValue3;
                //Log.w("strValue=", strValue);
            ar.add(str);
            }
            while(c.moveToNext());
        }
    }
    c.close();
    db.close();
    myDbHelper.close();
    return ar;
}

}

Answer 1

// try this way 
public void showCustomSelectState()
{
   String msg="Please Complete Setting First";
   View layout = LayoutInflater.from(this).inflate(R.layout.my_custom_toast1,null,false);
   TextView text = (TextView) layout.findViewById(R.id.textToShow);
   text.setText(msg);
   Toast toast = new Toast(this);
   toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
   toast.setDuration(Toast.LENGTH_LONG);
   toast.setView(layout);
   toast.show();
}

Answer 2

试试这个，

public void showCustomSelectState() 
    { 
        String msg="Please Complete Setting First"; 
        //Inflate the Layout 
        LayoutInflater layoutInflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View layout = layoutInflater.inflate(R.layout.my_custom_toast1, null);
        TextView text = (TextView) layout.findViewById(R.id.textToShow);
        // Set the Text to show in
        TextView text.setText(msg); 
        Toast toast = new Toast(MainActivity.this); 
        toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
        toast.setDuration(Toast.LENGTH_LONG); 
        toast.setView(layout);
        toast.show(); 
    }

Answer 3

在你搬到第四个活动之前，是否有可能，此代码中的某些值导致异常。（应用程序不会因为你抓到它而崩溃）

NewNewDataHelper db=new NewNewDataHelper(this);
                    List<String> list=db.CheckSettingData();
                    if(db.CheckSettingData().isEmpty())

尝试在catch块中提供错误消息

也许你的CheckSettingData()在你第一次实例化第四个活动之前返回null。您可以使用CheckSettingData()

的代码更新问题

Toast not display第一次在click事件上启动活动时

3 个答案: