字符串未转换为整数 - 应用程序崩溃。

所以我有一个editText，输入类型是数字，我尝试使用if语句，例如if（edtTxt> 20000）{//执行此操作}但每次都崩溃，任何想法都是什么问题？请注意，我通过多项活动发送此Integer。



我尝试过：

So i have an editText and the inputtype is "number", i try to use an if statement for it such as if (edtTxt > 20000 ) { // do this } but it crashes every time, any idea's what's the issue? please note that i'm sending this Integer through multiple activities.

What I have tried:

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_fre_quency_manual);



       btnEnter = (Button) findViewById(R.id.enter);
        btnClear = (Button) findViewById(R.id.clear);

        edtTxt = (EditText) findViewById(R.id.edtText);













        btnClear.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {


                edtTxt.setText("");


            }
        });





        btnEnter.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {



                AlertDialog.Builder builder = new AlertDialog.Builder(FreQuencyManual.this);
                builder.setTitle(" Confirmation ");
                builder.setMessage("Frequency scale : " + " " + edtTxt.getText().toString() + " " +"Are you sure?");


                builder.setPositiveButton(" Yes ", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {




                        if (edtTxt.getText().toString().matches("")){



                            Toast.makeText(getApplicationContext(), " Type the frequency scale first! ", Toast.LENGTH_SHORT).show();





                        }else {

                            Intent intentMove2 = new Intent(FreQuencyManual.this,Correction.class);
                            intentMove2.putExtra("msger",edtTxt.getText().toString());
                            startActivity(intentMove2);


                        }


                    }
                });

                builder.setNegativeButton(" No ", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {

                        dialogInterface.cancel();



                    }
                });




                AlertDialog dialog = builder.create();
                dialog.show();

            }




        });






                }}

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_correction);


        gifImageView = (GifImageView) findViewById(R.id.gifBruhhhh);
        txtInsert = (TextView) findViewById(R.id.checkInsertedFrequency);




        Bundle bundle = getIntent().getExtras();
        String data = bundle.getString("msger");



        int nurse = Integer.parseInt(data);

        if (nurse<=20000 && nurse>=0){


            Intent intent = new Intent(Correction.this,LoadingOld.class);
            startActivity(intent);



        }else {


            Intent intent2 = new Intent(Correction.this,FreQuencyManual.class);
            startActivity(intent2);

        }







    }
}