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POhow can set edit text as output and input?
 

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  1. POhow can set edit text as output and input?
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    <p>I'd like to know how to have multiple <em>EditText</em>, detect if one of those were modified and calculate the value to set txt of the not modified <em>EditText</em> in relation with the other.<br> It should be like a formula solver: 4 <em>EditText</em> 1 <em>Button</em>.</p> <p>When you press the button if one of the <em>EditText</em> is empty the text of the empty one has to be set to a value obtained with the value of the others. Actually it seems not to work, the activity crush when I press the calculate button. </p> <pre><code>public class motolineare extends Activity implements OnClickListener { EditText et1; EditText et2; EditText et3; EditText et4; Button calculate; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.formula); TextView textView1 = (TextView) findViewById(R.id.textView1); textView1.setGravity(Gravity.CENTER_HORIZONTAL); et1 = (EditText) findViewById(R.id.et1); et2 = (EditText) findViewById(R.id.et2); et3 = (EditText) findViewById(R.id.et3); et4 = (EditText) findViewById(R.id.et4); calculate = (Button) findViewById(R.id.calculate); calculate.setOnClickListener(this); } @Override public void onClick(View v) { // TODO Auto-generated method stub double num1 = 0; double num2 = 0; double num3 = 0; double num4 = 0; double res = 0; if ((TextUtils.isEmpty(et1.getText().toString()) &amp; TextUtils .isEmpty(et2.getText().toString())) || ((TextUtils.isEmpty(et1.getText().toString()) &amp; TextUtils .isEmpty(et3.getText().toString()))) || ((TextUtils.isEmpty(et1.getText().toString()) &amp; TextUtils .isEmpty(et4.getText().toString()))) || ((TextUtils.isEmpty(et2.getText().toString()) &amp; TextUtils .isEmpty(et3.getText().toString()))) || ((TextUtils.isEmpty(et2.getText().toString()) &amp; TextUtils .isEmpty(et4.getText().toString()))) || ((TextUtils.isEmpty(et4.getText().toString()) &amp; TextUtils .isEmpty(et3.getText().toString())))) { return; } num1 = Double.parseDouble(et1.getText().toString()); num2 = Double.parseDouble(et2.getText().toString()); num3 = Double.parseDouble(et3.getText().toString()); num4 = Double.parseDouble(et4.getText().toString()); switch (v.getId()) { case R.id.calculate: if ((TextUtils.isEmpty(et1.getText().toString()))) { res = (num2 * num3) / num4; editText.setText(" " + res); } else if ((TextUtils.isEmpty(et2.getText().toString()))) { res = (num1 * num4) / num3; EditText editText = (EditText) findViewById(R.id.et2); editText.setText(" " + res); } else if ((TextUtils.isEmpty(et3.getText().toString()))) { res = (num4 * num1) / num2; EditText editText = (EditText) findViewById(R.id.et3); editText.setText(" " + res); } else if ((TextUtils.isEmpty(et4.getText().toString()))) { res = (num2 * num3) / num1; EditText editText = (EditText) findViewById(R.id.et4); editText.setText(" " + res); } break; default: break; } } } </code></pre> <p>Logcat output:</p> <pre> 11-11 19:05:22.130: E/AndroidRuntime(1911): FATAL EXCEPTION: main 11-11 19:05:22.130: E/AndroidRuntime(1911): java.lang.NumberFormatException: Invalid double: "" 11-11 19:05:22.130: E/AndroidRuntime(1911): at java.lang.StringToReal.invalidReal(StringToReal.java:63) 11-11 19:05:22.130: E/AndroidRuntime(1911): at java.lang.StringToReal.parseDouble(StringToReal.java:248) 11-11 19:05:22.130: E/AndroidRuntime(1911): at java.lang.Double.parseDouble(Double.java:295) 11-11 19:05:22.130: E/AndroidRuntime(1911): at com.example.easyphysics.motolineare.onClick(motolineare.java:73) 11-11 19:05:22.130: E/AndroidRuntime(1911): at android.view.View.performClick(View.java:4084) 11-11 19:05:22.130: E/AndroidRuntime(1911): at android.view.View$PerformClick.run(View.java:16966) 11-11 19:05:22.130: E/AndroidRuntime(1911): at android.os.Handler.handleCallback(Handler.java:615) 11-11 19:05:22.130: E/AndroidRuntime(1911): at android.os.Handler.dispatchMessage(Handler.java:92) 11-11 19:05:22.130: E/AndroidRuntime(1911): at android.os.Looper.loop(Looper.java:137) 11-11 19:05:22.130: E/AndroidRuntime(1911): at android.app.ActivityThread.main(ActivityThread.java:4745) 11-11 19:05:22.130: E/AndroidRuntime(1911): at java.lang.reflect.Method.invokeNative(Native Method) 11-11 19:05:22.130: E/AndroidRuntime(1911): at java.lang.reflect.Method.invoke(Method.java:511) 11-11 19:05:22.130: E/AndroidRuntime(1911): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 11-11 19:05:22.130: E/AndroidRuntime(1911): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 11-11 19:05:22.130: E/AndroidRuntime(1911): at dalvik.system.NativeStart.main(Native Method) 11-11 19:05:25.371: E/Trace(1932): error opening trace file: No such file or directory (2) </pre>
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    1. This table or related slice is empty.
    1. PTQuestion
    1. USCSchulz
    1. USuser2980156
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      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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    2. PO
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      1. POhow can set edit text as output and input?
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    1. COpossible duplicate of [How can I set multiple editext to make aout put and input?](http://stackoverflow.com/questions/19912805/how-can-i-set-multiple-editext-to-make-aout-put-and-input)
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      1. POhow can set edit text as output and input?
      1. UScodeMagic
    2. COPlease don't create a new, duplicate post. Instead, edit your original post to include things asked for such as code in this case
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      1. POhow can set edit text as output and input?
      1. UScodeMagic
    3. COok, sorry, i'll delete the other question... the issue persists howevere...
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      1. POhow can set edit text as output and input?
      1. USuser2980156
 

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