如何将意图数据设置为当前活动editText？

Question

I'm trying to transfer two numerical inputs from one activity to another's UI but when I click the button to change intent it crashes.

I get the following in logcat: http://pastebin.com/zkWPcSNZ , which suggests a problem with the way I parsed the data to the editTexts in CalcResult.

My question is what is wrong with the way I'm trying to pass the data to the CalcResult editText.Is there an alternative method of acheiving this?

My two classes look like this for reference:

public class MainActivity extends Activity implements OnClickListener {

    //variables for xml objects
    EditText offsetLength,offsetDepth,ductDepth;
    Button calculate;

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

        //setting the variables to the xml id's and setting the click listener on the calc button
        offsetLength = (EditText)findViewById(R.id.offLength);
        offsetDepth = (EditText)findViewById(R.id.offDepth);
        ductDepth = (EditText)findViewById(R.id.ductDepth);
        calculate = (Button)findViewById(R.id.calc);
        calculate.setOnClickListener(this);//don't cast the listener to OnClickListener


    }

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

        try {

            String getoffsetlength = offsetLength.getText().toString(); 
            String getoffsetdepth = offsetDepth.getText().toString(); 
            String getductdepth = ductDepth.getText().toString(); 

            double tri1,tri2;
            double marking1,marking2;

            double off1 = Double.parseDouble(getoffsetlength);
            double off2 = Double.parseDouble(getoffsetdepth);
            double off3 = Double.parseDouble(getductdepth)
                    ;
            marking1 = Math.pow(off1,2) + Math.pow(off2,2);
            tri1 = (float)off2/(float)off1;
            tri2 = (float)off3/Math.atan((float)tri1);
            marking2 = (float)off3/Math.atan(tri2);


            Intent myIntent = new Intent(MainActivity.this, CalcResult.class);
            myIntent.putExtra("numbers", marking1);
            myIntent.putExtra("numbers", marking2);

            startActivity(myIntent);


        } catch (NumberFormatException e) {
            // TODO: handle exception
            System.out.println("Must enter a numeric value!");

        }

    }


}

This is the activity that I'm passing the data to:

public class CalcResult extends MainActivity
{
    EditText result1,result2;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.result);
        result1 = (EditText)findViewById(R.id.mark1);
        result2 = (EditText)findViewById(R.id.mark2);

        Intent intent = getIntent();
        Bundle bundle = intent.getExtras();
        double mark1 = bundle.getDouble("number1");
        double mark2 = bundle.getDouble("number2");

        int a = Integer.valueOf(result1.getText().toString());
        int b = Integer.valueOf(result2.getText().toString());

        result1.setText(a + "  ");
        result2.setText(b + "  ");

    }

}

Answer 1

When you start your second activity, both editText are empty

So when you do :

int a = Integer.valueOf(result1.getText().toString());
int b = Integer.valueOf(result2.getText().toString());

it's equivalent to :

int a = Integer.valueOf("");
int b = Integer.valueOf("");

which throws the exception

Caused by: java.lang.NumberFormatException: Invalid int: ""

If you want to set them the values you passed through both activities, you can just do :

double mark1 = bundle.getDouble("number1");
double mark2 = bundle.getDouble("number2");

result1.setText(mark1 + "  ");
result2.setText(mark2 + "  ");

Answer 2

The error is that you are putting your extras with same key " numbers " , and you are trying to retreive them by another keys "number1" and "number2". your code should be like this :

Intent myIntent = new Intent(MainActivity.this, CalcResult.class);
myIntent.putExtra("number1", marking1);
myIntent.putExtra("number2", marking2);

and to retreive them you should use :

Intent intent = getIntent();
double mark1 = intent.getDoubleExtra("number1", 0);
double mark2 = intent.getDoubleExtra("number2", 0);

And then , set the variables on your EditTexts like this :

result1 = (EditText)findViewById(R.id.mark1);
result2 = (EditText)findViewById(R.id.mark2);
result1.setText(mark1+"");
result2.setText(mark2+"");

Answer 3

您在发送意向书时使用了相同的名称作为附加内容，请尝试对其进行更正。