使用Intent返回时，应用崩溃

Question

My application crashed when I'm trying to navigate from one activity to another.I have a menu page which consists of buttons,when i hit the first button it takes me to another activity, but when i am trying to get back to my menu activity i am getting null pointer exceptions.I don't know what is the problem exactly?

    Intent  intent = new Intent(VehicleNo.this,OptionMenuAct.class);
   startActivity(intent);

I am using the above code to get back to menu page.I am getting problem in oncreate function.this is the code for that

    protected void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_option_menu);



    t_row1=(TableRow)findViewById(R.id.t_row1);
    t_row2=(TableRow)findViewById(R.id.t_row2);
    t_row3=(TableRow)findViewById(R.id.t_row3);
    t_row4=(TableRow)findViewById(R.id.t_row4);
    t_row5=(TableRow)findViewById(R.id.t_row5);
    t_row6=(TableRow)findViewById(R.id.t_row6);
    t_row7=(TableRow)findViewById(R.id.t_row7);
    t_row8=(TableRow)findViewById(R.id.t_row101);
    t_row9=(TableRow)findViewById(R.id.t_row102);


    ArrayList<String> pv = new ArrayList<String>();

    pv = getIntent().getStringArrayListExtra("values");

    for (String s : pv) 
    {
        Log.d("k", s);
    }

Answer 1

Your OnCreate method uses its intent and it should have an stringarraylist along with it, you are passing no such a thing. try to pass your desired stringarraylist when you are starting your menu activity

Answer 2

如果只想返回菜单页面，则可以调用this.finish()来this.finish()当前活动并返回菜单页面活动。