如何从另一个视图获取值并在同一活动中使用它？

Question

Hi I want to write a simple application for calculating the area of a triangle and I want the user to set the height and base of the triangle in Edittext view and by clicking on a button it shows the result in the Edittext view down below but my application crashes. this is my code : java code

java code

public class Activity2 extends AppCompatActivity {
TextView txtmasahat;
EditText edttext_ghaede;
EditText edttext_ertefa;
Button btnmosalas;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_2);
    txtmasahat=(TextView) findViewById(R.id.txtmasahat) ;
    btnmosalas=(Button)findViewById(R.id.btnmosalas);
    edttext_ertefa=(EditText)findViewById(R.id.edttext_ertefa);
    edttext_ghaede=(EditText)findViewById(R.id.edttext_ghaede);

    btnmosalas.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            int input1=edttext_ghaede.getInputType();
            int input2=edttext_ertefa.getInputType();
            double masahat=input1*input2/2;






        }
    });

Answer 1

I think this code will helps you.

  btnmosalas.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            String input1=edttext_ghaede.getText().toString();
            String input2=edttext_ertefa.getText().toString();

            if(!TextUtils.isEmpty(input1)&&!TextUtils.isEmpty(input2))
           {
            Integer 

                  Integer      masahat=Integer.parseInt(input1)*Integer.parseInt(input2)/2;
            }

    });

Answer 2

.getInputType() does not return the int value you expect. You can use the following code instead

public class Activity2 extends AppCompatActivity {
TextView txtmasahat;
EditText edttext_ghaede;
EditText edttext_ertefa;
Button btnmosalas;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_2);
    txtmasahat=(TextView) findViewById(R.id.txtmasahat) ;
    btnmosalas=(Button)findViewById(R.id.btnmosalas);
    edttext_ertefa=(EditText)findViewById(R.id.edttext_ertefa);
    edttext_ghaede=(EditText)findViewById(R.id.edttext_ghaede);

    btnmosalas.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            String input1Str=edttext_ghaede.getText().toString();
            String input2Str=edttext_ertefa.getText().toString();
            int input1 = Integer.parseInt(input1Str);
            int input2 = Integer.parseInt(input2Str);
            double masahat=input1*input2/2;






        }
    });

Answer 3

int input1=edttext_ghaede.getInputType();

What you need isn't getInputType() . You need to use getText().toString() to retrieve data from that `EditText'.

Also, you'll need to convert the String you get into an Integer . For that, the complete statement will become:

Integer.parseInt(edttext_ghaede.getText().toString());

Good luck.

Answer 4

 edttext_ertefa=(EditText)findViewById(R.id.edttext_ertefa);
    edttext_ghaede=(EditText)findViewById(R.id.edttext_ghaede);

    btnmosalas.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            int input1=Integer.parseInt(edttext_ghaede.getText().toString().trim());
            int input2=Integer.parseInt(edttext_ertefa..getText().toString().trim());
            double masahat= input1 * input2/2;
        }
    });

Also set this to your xml inside ....

android:inputType="number"

Answer 5

 int input1=Integer.parseInt(edttext_ghaede.getText().toString());

Answer 6

Get a value from edittext using

int input1=Integer.parseInt(eedttext_ertefa.getText().toString());

instead of

 int input1=edttext_ghaede.getInputType();

InputType is use for what we ristrict to user to enter text/number like below code set inputtype number.

editText.setInputType(EditorInfo.TYPE_CLASS_NUMBER);