java.lang.NumberFormatException: Invalid int: "" : Error
<p>I am doing some calculation but unable to parse a string into int or even in float.I searched for solution and i read it somewhere there must be a empty string but i checked my editText using </p>

<pre><code>log.v("Valuee",e1.getText().toString());
</code></pre>

<p>and its print the values prove that string is not empty.. 
What i am missing ? </p>

<p>Here is <strong>logcat</strong></p>

<blockquote>
  <p>java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.farrukh.bmi/com.example.farrukh.bmi.Main2Activity}: java.lang.NumberFormatException: Invalid int: ""
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
     at android.app.ActivityThread.access$800(ActivityThread.java:135)
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
     at android.os.Handler.dispatchMessage(Handler.java:102)
     at android.os.Looper.loop(Looper.java:136)
     at android.app.ActivityThread.main(ActivityThread.java:5017)
     at java.lang.reflect.Method.invokeNative(Native Method)
     at java.lang.reflect.Method.invoke(Method.java:515)
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
     at dalvik.system.NativeStart.main(Native Method)
  Caused by: java.lang.NumberFormatException: Invalid int: ""
     at java.lang.Integer.invalidInt(Integer.java:137)
     at java.lang.Integer.parseInt(Integer.java:358)
     at java.lang.Integer.parseInt(Integer.java:331)
     at com.example.farrukh.bmi.Main2Activity.onCreate(Main2Activity.java:31)
     at android.app.Activity.performCreate(Activity.java:5231)
     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) 
     at android.app.ActivityThread.access$800(ActivityThread.java:135) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
     at android.os.Handler.dispatchMessage(Handler.java:102) 
     at android.os.Looper.loop(Looper.java:136) 
     at android.app.ActivityThread.main(ActivityThread.java:5017) 
     at java.lang.reflect.Method.invokeNative(Native Method) </p>
</blockquote>

<p>Here is <strong>MainActivity.java</strong></p>

<pre><code> public class Main2Activity extends AppCompatActivity {

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main2);

          final   Button b = (Button) findViewById(R.id.button);
          final   EditText e1 = (EditText) findViewById(R.id.editText2);
          final   TextView text = (TextView) findViewById(R.id.textView4);
          final  String height = e1.getText().toString();


          final int a = Integer.parseInt(height); //got error while parsing

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


                 //   Log.v("EditText",e1.getText().toString());

                }
            });


        }


    }
</code></pre>

<p>Here is <strong>activity.xml</strong></p>

<pre><code>&lt;Button
        android:layout_width="132dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="50dp"
         android:layout_gravity="center_horizontal"
        android:text="CLICK"
        android:clickable="true"
        android:id="@+id/button"/&gt;

&lt;EditText
        android:layout_width="120dp"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:ems="10"
        android:id="@+id/editText2"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="20dp"
        android:gravity="center" /&gt;


    &lt;TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:id="@+id/textView4"
        android:layout_gravity="center_horizontal"
        android:gravity="center"
        android:layout_marginTop="20dp"
        android:textColor="#3b9ff0" /&gt;
</code></pre>